Home

Application note for ATT7022B

1. gt Enable SPI CS 1 SCLK 0 CS 0 Send 8 bits Command to SPI for n 7 n gt 0 n SCLK 1 DIN Com n NOP NOP NOP SCLK 0 waiting 3us delay 3 Read 24 bits Data From SPI for n 23 Data 0 n gt 0 n SCLK 1 nop nop nop Data n DOUT SCLK 0 Disable SPI FAVA TERI HARES CLE AT BRS http www hitrendtech com Pagel4 of 34 Rev1 0 HiTrenatecn Application note for ATT7022B 260 CS 108 CS 1 Return Data From SPI return Data The following is reading and operating time sequence Command Data lt SPI will write and operate and grasp several main points while reading 1 It is draw high CS to want to finish to operate each time it will operating drawing low to read write next time 2 Before the CS is drawing low SCLK should be in the low level state 3 While writing the order word or the address or the materials high level in SCLK want materials entered to write ready DIN decline in SCLK is that SCLK rise and release the data along DOUT while reading the data along adopting the materials into it 4 The materials are put to the mouth on linly through several NOP read and enter the one chip computer or write into and measure the chip after the materials are steady SPI writes time sequence
2. 0 5 z 3 acos 1 0 0174 0 5 z 3 acos 0 4913 mz 3 0 01001709 gt 0 Phsreg 0 2 23 84029 1483DH MOV 20H gt 01H MOV 21H gt 48H MOV 22H gt 3DH MOV A 91H LCALL WR_SPI MOV A gt 92H Does not partition writes each section register the similar correct value LCALL WR_SPI MOV A 93H LCALL WR_SPI MOV A gt 94H LCALL WR_SPI MOV A gt 95H LCALL WR_SPI 9 Writes the C power gain The three phase voltage inputs 220 volts inputs the C interphase current 1 5 A the power factor isy 1 0 the standard table obtains the electrical energy error is 0 5 ERR 0 005 then HOSA FERC HEB EIO ARAINA http www hitrendtech com Page29 of 34 Rev1 0 Ohilrenatecn Application note for ATT7022B 260 CS 108 r Pgain 0 005 1 0 005 0 00497512 lt 0 l err Pgain 2 24 Pgain 2 23 2 24 0 00497512 2 23 16735481 FF5CF9H MOV 20H gt 0FFH MOV 21H gt 5CH MOV 22H gt 0F9H MOV A gt 88H LCALL WR_SPI MOV A gt 8BH Does not partition writes each section register the similar correct value LCALL WR_SPI 0 3 C phase adjustment The three phase voltage inputs 220 volts inputs the C interphase current 1 5 A the power factor is 1 0 the standard table obtains the electrical energy error is 0 5 ERR 0 005 then 0 acos 1terr 0 5 z 3 acos 1 0 0174 0 5 z 3 acos 0 4913 m 3 0 01001709 gt 0 Phsreg 0 2 23 84029 148
3. 09 1 0 278958 gt 0 Ugain INT Ugain 2 23 0x23B4E7 MOV 20H gt 23H MOV 21H gt 0B4H MOV 22H gt 0E7H MOV A gt 9CH LCALL WR_SPI C Phase voltage correct valueUgain 440 344 03 1 0 278958 gt 0 Ugain INT Ugain 2 23 0x23B4E7 MOV 20H gt 23H MOV 21H gt 0B4H MOV 22H gt 0E7H MOV A gt 9DH LCALL WR_SPI 12 Writes A B the C interphase current adjustment The three phase voltage inputs 220 volts the three phase current inputs 1 5 A the power factor is 1 0 reads the electric current register the value Ii respectively is 0x7C000 507904 0x75CCC 482508 0x78000 491520 after effective value computation Irms 1i 2 10 2 23 1i 2 13 In the electrical energy table voltage reading respectively is 62A 58 9A 60A the electric current correct value is Igain Ir Irms 1 If does not need to read gathers the interphase current value when adjustment Ir may use directly the value substitutes the computation with standard table magnitude of current 1 5A If needs to read gathers the interphase current value when dial gauge Ir with the 26 WUER CEPHE CEI ARAINA http www hitrendtech com Page31 of 34 Rev1 0 Hikrendtech Application note for ATT7022B 260 CS 108 time of standard table magnitude of current substitution computation namely Ir 1 5 2 6 96 after the dial gauge completes when survey MCU should the electric current effective value which reads out do divides 2 6 the operation namely Urms Vix 2 13 2 6 V
4. but other four conditions only can choose one kind or all not choose Its choice method please HOSA FERC HEB EIO ALB ZS TAT http www hitrendtech com Pagel9 of 34 Rev1 0 Obilienatecn Application note for ATT7022B 260 CS 108 refer to following form EnLineFreq EnHarmonic function Content of the register Content of the register 0x007812 Not equal to 0x0055AA Fundamental wave meter 0x0055AA Harmonic meter Ox008127 ff RMS apparent energy meter 0x005523 ff eee PQS apparent energy meter Other value J Forbid above function Notice that will fill in materials 0x007812 in EnLineFreq register first while choosing the wave form way in harmony then fill in materials 0xO055AA to EnHarmonic register make the chip in the wave in harmony and measure the state if the materials that EnHarmonic register fills in are not 0x0055AA then the chip is in the base wave and measure the state It is a basic function that the whole wave of ATT7022B measures the state it is effective all the time that the electric energy pulse exports CF1 CF2 it was big or small that its frequency reflected and shut looks gaining merit equally and inactive power in the whole unexpected turn of the check up of gaining merit dailily in the instrument and inactive power can be used as the whole wave and gains merit and has no electric energy measurement of work When open RMS apparent state of measuring of electric
5. 0 0 15V Iregion4 INT G Is4 2 23 0x013E81 so long as write 0x013E81 into the phase place to compensate the area to set up 4 address 0x05 of it is zero that pay other phase places for the number value of setting up register in the area The power gaining and correcting The power gains and corrects carrying on for the condition of 1 in the power factor Propose electric current is it correct to order in Ib gain power 0 gain with power 1 register value write with the same correcting value err Correct the formula Pgain l err If Pgain 0 gt Pgain INT Pgain 2 23 Pgain lt 0 Pgain INT 2 24 Pgain 2 23 It is a error not including s symbol to pay attention to calculating electric energy error err in formulae The phase place correcting It is carried on for the condition of 0 5L in the power factor that the phase place is corrected Pay the area for and choose suitable correcting the electric current clicked according to the phase place set up can receive the satisfactory precision of power to make If does not segment propose correcting to the phase place of area 4 register value in area 0 to write with the same correcting value Correct the formula 0 acos 1 err 0 5 x 3 If 9 0 gt Phsreg INT 6 2 23 0 lt 0O gt Phsreg INT 2 24 6 2 23 The phase place is corrected to calculate the unit as the radian in the formula Base wave the wave apparent electric energy in harmony correcting Corre
6. Obilrenatecn Application note for ATT7022B 260 CS 108 Application note for ATT7022B Application note for ATT7022B 1 eseseeereceeeseeeetieeeeeteeeeeeeeeee tent teenceeceneneeneneectneneeneneeneneeneasenensenetenensesnnenenn ey 1 I Hardware Circuit Designeeeeeeeeeeeeereeettertterrteeettteettttrtttsrtteertesrteentenertennntesnntesnneennenenteeenteenntennntennntenr etet 2 Analog Input eeeeeteeteettertttettttsettsetesstetsntenttennttesnttsnttenntennntenntnenttnenntnnntsnnnennenenneentiennntennteennneentnenntnen te 2 Electrical energy pulse output circuit eeeeeetertterttertteretteretteertterrttesrrtetetenteeentennrtennttennntennetentenenreennteenntennt 4 Power Circuit eenieder ainena iea anaedai a 6 Interface with the monolithic integrated circuite eeeeeeeeetetteetttertttertttertrteerttetterertetertennntesentennneenteenntennntennt 7 Judges the chip to work normally or noteeetttetttttretteretettteterttrettt ertett ett ttnt ttte ett nenn ttet nnert tenn tt tenn tten enet ttt 8 II Electromagnetic Compatibility Design eetere eertrerrreettesttserttsnrttnrttsnreesreeenteentteenteennttsnnt tt 9 PCB Wiring explanations eeeeeeteeteettettitttteetteestterttetettsettsesntenntennneennenentenettennttesnniennntenteeenteenntnennennnte nnt 9 TI Software Designers eeeetiteeiteiteeeneeeeneneeceneneencneeeeneneeneneeseneneeneneeneiscnsaesatasancnsaceatasancnsensness 13 SPI od CRESS OEEOOOESSOOEOOOOEEOOSOOEOOOOOOOOOOOOSOOOOOOOOOOOOOOOOOOOOOOOOOOOSOOOOSOOOOOOESOOSOOOOSOOOS
7. Peripheral hardware circuit mainly includes power supply analog voltage and current input pulse output and SPI interface etc Analog Input ATT7022B integrated 7 16 bit ADCs internally The effective electric current is in the range from 2mV to 1V with a linear error less than 0 5 The effective voltage value is in the range from 10mV to 1V with a linear error less than 0 5 If the voltage value is in the range from 0 2V to 0 6V amplified voltage value suggested voltage sampling signal is 0 1V choose the voltage channel amplification ratio to be 4 the electric current value is in the range from 2mV to 1V the electrical energy linear error is smaller than 0 1 Each ADC uses pin VxP and VxN as AC input and bias VxP VXN to be about 2 4V DC voltage This biased voltage can be obtained from the reference voltage output REFOUT of the chip as well as from external reference voltage The sampling voltage input of three phase meter measuring chip can be obtained by selecting resistance divider method e g Figure 1 and Figure 2 or the voltage transformer method e g Figure 3 or converting voltage into current first then passing through the current transformer and transforming the electric current to voltage e g Figure 4 The latter two ways uses mutual inductor isolating the chip and the electrical network thus obtain good anti interference performance Figure 1 connects zero curve VN and the chip reference voltage output REFO this wi
8. Rev1 0 Hikrendtech Application note for ATT7022B 260 CS 108 and then do the power to gain and correct first and then correct the phase place the phase place is corrected to finish the power and carry on after being being gained and corrected Correcting carrying on for the terms of zero in the corresponding register parameter of the form of school of all ATT7022B is being set up into a wave form of the base the wave form in harmony or looking at when the electric energy measures the function set up and help the wave form state to correct first while proposing the school form has already enabled controlling the wave measurement of the base register EnLineFreq 0x000000 is it fill out register this according to need corresponding value make chip enter base wave form well to correct the wave form or apparent electric energy in harmony measure the function state does not need to do the base wave wave form or apparent electric energy in harmony and measure error correction after generally correcting w __ What the defaulting value offered gains and can guarantee enough precision while correcting coefficient in LineFreqPg 0x31 register Set up voltage passway ADC and gain UADCPga Voltage passway ADC gains UADCPga 0x3F and sets up voltage passway ADC and amplifies the multiple through filling in propose that the sample signal Vu while guaranteeing specified Un of voltage amplifies multiple VADCPgain and equals about 0 5V Set up
9. adjustment register Is lower than the phase compensation region to establish 3 partition electric current the phase correct value to read in the region 3 phase adjustment register Analogizes in turn finally is higher than the phase compensation region to establish 1 partition electric current the phase correct value to read in the region 0 phase adjustment register If phase partition insufficient 5 sections then establishes 4 from the phase compensation region to start to establish the insufficient register establishment value is a zero 7 The electric instrument in the input three phase voltage respectively gives A B C inputs the basic electric current the power factor is under 1 condition according to each electrical energy error value which obtains writes the power gain value to arrive corresponding dial gauge register 06H 07H 08H orders 86H 87H 88H and in 09H OAH OBH orders 89H 8AH 8BH 8 The electric instrument in the input three phase voltage respectively gives A B C inputs the basic electric current the power factor is under the 0 5L condition according to each electrical energy error value which WOUTER CEPHE CEI ARAINA http www hitrendtech com Page25 of 34 Rev1 0 HiTrenatecn Application note for ATT7022B 260 CS 108 obtains writes the phase correct value to arrive dial gauge register OCH 11H 16H If does not partition makes the phase calibration then simultaneously writes about the phase c
10. energy signal after the time integral again produces the idle work electrical energy pulse signal the fundamental wave the overtone actives with the idle work also is same they all need to gather the energy accumulation pattern according to the hypothesis to do the three phase electrical energy absolute value adding together or the algebraic value adding together operation and the result transformation is the frequency code then carries on the frequency division according to the user hypothesis frequency division coefficient obtains available in the dial gauge electrical energy pulse output signal The pulse width and the cyclical part production all is same its production process overall diagram is as WUER GHB EA ARAMA http www hitrendtech com Page4 of 34 Rev1 0 Application note for ATT7022B 260 CS 108 Hilrendtech Ez i j i Ha xS i 7 Fa ie Te H i 7 gt TE i au sl a sl i az pig I A AN H A la 4 i s lt i Hi i ty 3x i Sa E x i E x R i a SS Be per Be bg ZS zi o m in aH i avr 2 x i poe ej pei w ue 7 N a Ni i Pa i a i E i pet j ian fico i LEA i amp ET ee E E A Oe 4 z o 4 Is obvious by on chart through two registers 0x2D and 0x3C the establishment may clear the fundamental wave or the overtone electrical energy measurement function The fundamental wave survey enables control register EnL
11. harmony etc its block diagram is as follows WUER CEPHE CEI ARAINA http www hitrendtech com Page20 of 34 Rev1 0 Hi Tentech Application note for ATT7022B 260 CS 108 Nev aBtk BE UE HIRA SUA U Addr 0x0D 0E70F 2B UT n Ha CES BAHT 44 Dy Dy fi A ffL Addr 0x01 02 0 GEURE SEn EIIZ hh se de JAA HAREE ERED ah Poa hee fe sae es Addr 0x05 06 07 Ul n H E Werth Q ZENK Ai iy fij lj ret Rl ER k Se Tiere Addr 0x09 0A 0B Hiin UPR PE Addr 0x14 15 16 UTI n ALFA Pg Addr 0x18 19 1A From on pursue it can be seen control register the SelectPQSUs participate in voltage the virtual values power power factor signal source photo corner of operation SelectPQSU X 0x001228 hour by U n I n the whole wave sampling signal of UT n make operation receives parameters such as voltage virtual value power power factor photo corner of the whole wave etc act as SelectPQSU 0x001228 hour by U1 n Il n UTI n these base wave or in harmony wave sampling signal is it make operation to go on confirm to be base wave signal or in harmony wave signal by EnLineFreq and EnHarmonic register get the parameters such as the base wave or the voltage virtual value power power factor photo corner of the wave in harmony etc correspondingly When EnLineFreq has not chosen the base wave or the wave form in harmony the choice of SelectPQSU works When ATT7022B is in the base wave
12. high frequency and output parameter HFreq This is about the output dial gauge pulse frequency frequency division coefficient GxGxF xF Loa xia xN INT 5760000000 x Hfreq In the type Un in order to join than the voltage Ib is the specified electric current N is a pulse constant Vu is being joined and inputting more than the voltage it is at chip sample voltage it in charge of foot V2p and V2n V4p and V4n V6p and V6n corresponding voltage if gain after setting up voltage the passways it should be the voltage after amplifying sample not in charge of foot ofing when it is in Vi input electric current not specified chip electric current V 1p and V1n V3p and V3n V5p and V5n corresponding voltage G is the constant 0 648 Hfreq outputs the constant for high frequency Write Hfreq value into school form register 20H the chip sends out CF signal according to the pulse constant designed Notice that this parameter fetching value should not be smaller than 0x000004 should not at the same time be greater than 0x000D00 Set up than the compensation area of difference Parameter that the voltage of electric current according to recommending above samples ATT7022B is 1000 The linear range of 1 the power gains and corrects needing to segment can simplify the school form course of production do not need to set up more than the regional register Ox1E of difference compensation at this moment keep for zero namely the preservin
13. it is the measurement value The contained angle parameter of the voltage does not need correcting but only when the contained angle measurement of the voltage can control register EnUAngle to make At the 0x003584 ATT7022B does not can measure photo corner measurement of the voltage thus receive the contained angle parameter of the voltage The voltage contained angle of ATT7022B is measured the function to close when acting as EnUAngle register other content not equaling 0x003584 s When base wave wave and electric energy in harmony measure the function and open the voltage contained angle can t be opened to test the function for a long time RMS value ATT7022B offers the base wave wave and virtual value of voltage of every point of looks and the voltage vector quantities of three phases and virtual value of the whole wave in harmony and the electric current virtual value of the whole wave the vector quantity of the three phase current and virtual value Read register value divided by 2 13 it is the measurement value Can find out the gaining and compensating and gaining and compensating carrying on with the power separately of ROSA EUR EER EO ARAINA http www hitrendtech com Pagel7 of 34 Rev1 0 HiTrenatecn Application note for ATT7022B 260 CS 108 virtual value while dealing with the procedure by ATT7022B signal even if the electric energy error is regulated virtual value still needs to correct one by one 7 No ADC us
14. low pass filter to eliminate high frequency interference As long as the SPI communication speed is in normal situation the decoupling capacitor can be chosen to be large enough to strengthen its anti interference ability Pay attention to the resistor and decoupling capacitor at CS SCLK DIN pins should be as close to the chip as possible while for DOUT pin these components should be as close to the monolithic integrated circuit as possible Although ATT7022B has a very perfect verification method for SPI read write operation strengthening the anti jamming ability is still very important The monolithic integrated circuit must monitor the SIG signals or their conditions When the power is turned on or when ATT7022B is reset exterior MCU must update the calibrating data through SPI pins to guarantee the measurement accuracy The SIG signals are used to handshake with exterior MCU Putting 0 01uF decoupling capacitors at SIG inputs of the monolithic integrated circuit can strengthen its anti jamming ability Of course you can check the bit 7 of the flag condition register address 0x2C is set or not to make sure the calibrating data need update or not After the power is turned on or ATT7022B is reset in order to keep synchronous between the monolithic integrated circuit and ATT7022B the ATT7022B RESET signal is controlled only by the monolithic integrated circuit The reset process is that the RESET signal keeps at low level more than 20
15. of zero clearing after reading mark 2 register The renewal that the electric energy record is in pace with form pulse of the school namely CF mouth generates a electric energy pulse corresponding electric energy register number value adds one So value energy of register divided by pulse constant actual power consuming reading It is meritorious electric energy register whether reach 0x21 of Ox1E reach 0x34 of 0x31 it write down to and wave absolute value of electric energy not meritorious not the whole backward and work it have electric energy register reach 0x25 of 0x22 reach 0x38 of 0x35 write down to and backward wave not the whole absolute value work of electric energy and It write down base wave or wave or RMS not in harmony of electric energy register reach 0x53 of 0x50 reach 0x73 of 0x70 to and absolute value of electric energy not meritorious backward and it work base wave not same by electric energy register reach 0x57 of 0x54 reach 0x77 of 0x74 it write down base wave or wave or PQS not in harmony of to and can t absolute value work of electric energy backward and Shut the looks electric energy Register 0x21 0x25 0x34 0x38 the value of 0x43 0x47 Ox4B Ox4F 0x53 0x57 0x63 0x67 OX6B Ox6F 0x73 0x77 is to accumulate the way according to the energy established the calculation carrying on absolute value sueing for peace or algebra of the three phase electric energy and sueing for peace is got F
16. or the state of measuring of wave in harmony voltage contained angle the looks preface of the electric current these two functions try one s best to close at ordinary times don t open at the same time so as not to influence the precision The meter calibration referance The meter calibration form is gained to every phase electric current voltage gaining power gaining phase place is compensated the power gains and compensates and proposes not segmenting Phase place is it can require according to precision is it segment or go on by stage to consider to correct It segments to be to is it divide to come according to size of electric current correct to phase place can divide 5 go on at most Starting electric current and giving up the voltage of threshold value of the looks and can be set up with the software of ATT7022B When ATT7022B runs the form of software school generally speaking the voltage electric current are corrected start the electric current to set up give up the voltage of threshold value of the looks to set up there is not a request on a order While carrying on the power to gain and correct please notice and set up and shut first that looks energy accumulate the way needed to save this step by you such as the defaulting value voltage passway ADC gain and output the parameter with high frequency this is the condition that power corrects WUER CEPHE CEI ARAINA http www hitrendtech com Page21 of 34
17. the power factor or the direction of the photo corner that the high position express the most of the materials its definition and inactive power direction are defined the samly 0 expresses that 1 is being expressed and shouldered Reduce the factor register reading of the power as original yard divided by 2 23 receives the power because of number value after the school form finishes the phase place to compensate this is the real power of electric wire netting because of number value The photo corner one it is for being original behind A since there is calculation reduce register reading A 2 23 2 180 z In different quadrants the angle shown needs to change as follows have work as active power as when being actual angle When the active power is there is no work in order to shoulder the real angle is 360 For shoulder have work as active power as when being actual angle 180 When the active power is in order to shoulder there is no work in order to shoulder the real angle is 180 0 Power factors and photo corner parameters do not need correcting Voltage contained angle ATT7022B provides the contained angle of the voltage of every point of looks only the parameter of the whole wave offer the contained angle that three register YUaUbs YUaUc YUbUc express AB AC BC voltage respectively Need to measure the function of the photo corner of the voltage and open to examine to read register value divided by 2 13
18. voltage value virtual value of register lower than disconnected looks value threshold value of register to measure bit0 bit1 bit2 in measuring parameter register 0x2C provide A B C every phase and lose and press the state sign Frequency By crossing the zero point of voltage signal ATT7022B measures the frequency of the base wave of the electric wire netting leaves in order to mend counting in the register because frequency value can not for shoulder so high position can not 1 the most Read register value divided by 2 13 it is the HOSA FERC HEB EO ALB ZS TAT http www hitrendtech com Pagel8 of 34 Rev1 0 HiTrenatecn Application note for ATT7022B 260 CS 108 frequency value this parameter does not need correcting Electric energy ATT7022B offers various kinds of electric energy record materials The whole wave is to the meritorious electric energy record meritorious electric energy record backward of the whole wave wave not the whole writing down with work the electric energies wave not the whole to having wave not in harmony for work the electric energies write down electric energy not meritorious write down base wave wave not in harmony have work electricity of base wave wave not in harmony for work t backward RMS apparent electric energy and apparent electric energy of PQS Each record will offer corresponding electric energy register and electric energy register of zero clearing after reading
19. 3DH MOV 20H gt 01H MOV 21H gt 48H MOV 22H gt 3DH MOV A gt 96H LCALL WR_SPI MOV A gt 97H Does not partition writes each section register the similar correct value LCALL WR_SPI MOV A gt 98H LCALL WR_SPI MOV A 99H LCALL WR_SPI MOV A 9AH LCALL WR_SPI Writes A B the C phase voltage adjustment The three phase voltage inputs 220 volts the three phase current inputs 1 5 A the power factor is 1 0 voltage register value Vu respectively is 0x2A8000 2785280 0x2AE305 2810629 0x2BO0F1 2818289 after effective value ROSA PERG HRB EIO ALB ZS TAT http www hitrendtech com Page30 of 34 Rev1 0 Hikrendtech Application note for ATT7022B 260 CS 108 computation Urms Vu 2 10 2 23 Vu 2 13 In the electrical energy table voltage reading respectively is 340V 343 09V 344 03V the voltage correct value is Ugain Ur Urms 1 Ur is the standard table voltage reading Because of opening harmonic voltage test function When adjustment the Ur value substitutes the computation with 2 times of standard table voltage values After adjustment finished when survey MCU should the voltage effective value which reads out do divides 2 operations namely Urms Vu 2 13 2 Vu 2 14 A Phase voltage correct valueUgain 440 340 1 0 2941176 gt 0 Ugain INT Ugain 2 23 0x25A5A5 MOV 20H gt 25H MOV 21H 0A5H MOV 22H gt 0A5H MOV A gt 9BH LCALL WR_SPI B Phase voltage correct valueUgain 440 343
20. 60 CS 108 order to guarantee to shut the calculation accuracy of the looks electric current every phase electric current value after correcting should guarantee certain resolution Is it import to electric current for correct the electric current the value close to 60A among ATT7022B at the specified electric current to propose Consider the convenience of calculating can correct the electric current to Ib X 2 close to 60A N deals with from one chip computer into a real electric current signal finally When Ib is input for 1 5A it makes ATT7022B export 96A to correct through the electric current will examine the signal had divided by 64 in the one chip computer get the last measurement value 1 5A If Ib is 5A corrected to 80A will be examined the signal had divided by 16 by the one chip computer while importing get the last measurement value 5A If Ib is 20A corrected to 80A will be examined the signal had divided by 4 by the one chip computer while importing get the last measurement value 20A The establishment breaks the threshold value Give up the establishment of the threshold value of the looks after the voltage is corrected and finished IV Software dial gauge formula demonstration The software dial gauge flow is as follows When writes operation the dial gauge register position site highest position 1 called it is order if writes register 20H order is 0A0H 1 2 a A A Ww on Reset A
21. Pga 0x3F establishment voltage channel ADC enlargement factor is 4 MOV 20H gt 46H MOV 21H gt 55H MOV 22H gt 01H MOV A gt 0BFH LCALL WR_SPI 3 Write HFConst Hfreq INT 5760000000 x UF xd xN 5760000000 0 648 0 648 0 5x0 1 220 1 5 3200 114 72H MOV 20H 00H MOV 21H gt 00H MOV 22H gt 72H MOV A 0A0H LCALL WR_SPI 4 Wirte Inruch current To 0 4 Vi 0 0040 1 0 0004 Istartup G To 0 648 0 0004 0 0002592 Istartup 0 0002592 2 23 2174 87EH MOV 20H gt 00H MOV 21H gt 08H MOV 22H gt 7EH MOV A 9FH LCALL WR_SPI 5 Writes the A power gain The three phase voltage inputs 220 volts inputs the A interphase current 1 5 A the power factor is 1 0 standard table electrical energy error reading for 0 74 namely err 0 0074 then err Pgain 0 0074 1 0 0074 0 00745516 lt err Pgain Pgain 2 23 0 00745516 2 23 62538 0F44AH WUER CEPHE CEI ARAIA http www hitrendtech com Page27 of 34 Rev1 0 Obilrenatecn Application note for ATT7022B 260 CS 108 MOV 20H 00H MOV 21H 0F4H MOV 22H gt 4AH MOV A gt 86H LCALL WR_SPI MOV A gt 89H Does not partition writes each section register the similar correct value LCALL WR SPI 6 Writes the A phase adjustment The three phase voltage inputs 220 volts inputs the A interphase current 1 5 A the power factor is 0 5L the standard table electrical energy error reading
22. SOSOOOSSOSS 13 Communication ear eiai ei akeen anaa EANAN EAE EaI A ENA ETNEA NANOA ENEE EEN EEA E E 13 Measure the parameter eeeteetteetettretttetttttsrtiestttsrttertteenttennttesnttenntenntennteentenenttnentennnesnnnnnnteenttennnrennntennnt 16 The meter calibration referance eeeeeteeeettetteetttetttetttetttstrtetetetrtetreserestenserestnestrettnstererereterereneseerereeeeeeseeesenet 21 IV Software dial gauge formula demonstration etetett eetreettreetttertttsrttertterttnenttnertennrtesnttenttesrtenn tett 25 Software dial gauge application example reeset eeeeteeeeetteeeeeseeeeeeneneeeeneneen ents tenes neateneneenenteneeeceneeseney 26 This application note introduces the reference design method using ATT7022B to make a multi functional electrical energy meter Before reading this note reading ATT7022B user manual thoroughly is suggested ATT7022B is a high precision and multi functional prevent fault fundamental and harmonic 3 phase electronic energy measuring chip It incorporates 7 second order sigma delta ADCs Among them 3 are used for three phase voltage sampling 3 are used for three phase current sampling the last ADC is used for other guards against in the zero curve electric current steals the electrical parameter the sampling the output sampling material and the effective value It is extremely convenient to use This chip is suitable for three phase three wire and the three phase four wire applications This chip also integrated the re
23. TT7022B examines SIG is low when delivers the dial gauge material this step may abbreviate Filling in voltage channel ADC gain UADCPga 0x3F establishment voltage channel ADC enlargement factor Writes the high frequency pulse output parameter to order OAOH to dial gauge register 20H Writes the starting current to order 9FH to dial gauge register 1FH if does not do this step default start magnitude of current for basic electric current 0 1 Writes breaks the threshold value voltage to order 0A9H to dial gauge register 29H if does not do this step the default breaks the threshold value voltage 10 for the senate voltage gradient speaking of three phase four or 60 speaking of three phase three 6 Writes the phase compensation region to establish to dial gauge register 02H 03H 04H 05H orders 82H 83H 84H 85H if does not do this step expressed does not partition carries on the phase calibration this time the phase correct value default takes the region 0 phases to adjust the register the value If wrote the phase compensation region establishment register partition to carry on establishment according to electric current size established 4 from phase compensation region to start to establish electric current smallest partition spot read in phase compensation region to establish 4 then was lower than the phase compensation region to establish 4 partition electric current the phase correct value to read in the region 4 phase
24. WriteSpi Com Data Enable SPI CS 1 SCLK 0 CS 0 Send 8 bits Command to SPI for n 7 n gt 0 n SCLK 1 DIN Com n NOP NOP NOP SCLK 0 POBUAROC HB CEI ARAINA http www hitrendtech com Pagel5 of 34 Rev1 0 HiTrenatecn Application note for ATT7022B 260 CS 108 Send 24 bits Data to SPI for n 23 Data 0 n gt 0 n SCLK 1 DIN Data n NOP NOP NOP SCLK 0 gt Disable SPI CS 1 Measuring the parameter and exporting it in the register Ox2D 0x2E for the materials that SPI was written into of last time 0x28 was last materials read while writing the procedure that SPI reads and writes use these registers to do than correctly can improve the dependability of the communication Propose sending order 0xC9 materials 0x000001 after finishing SPI to write and operate in addition close the writing and operating of the form register of SPI checking prevent the checking form materials register from being written by mistake by SPI if writing with operating SPI send order 0xC9 materials 0x000000 and then carry on the operation of writing of SPI Last and ChkSum2 Ox5F ATT7022B it use for not for ATT7022B all checking of check up form of materialsesing and it is upgraded 3 times that per second read the value of check up and register regularly the check up and value that are kept with the one chip computer are compared such as is it prove checking form materials m
25. aterials of register correct such as is it prove checking form materials materials of register interfere changing to vary to equal need to hand over the checking again It is easy to read write with and check the register check up and register and SIG signal to use can improve the anti interference ability of the products from software design Measure the parameter All measurement value of ATT7022B can be read from measuring the parameter register per second to do the data three times to upgrade is 3 2K that the materials export the speed of upgrading that the seventh No ADC of 0x3f sample these parameters have Power Base wave wave active power of the whole wave inactive power apparent power in harmony among them there is value of shutting looks of dividing every phase The power is the quantity with symbol all gains merit and the inactive power have directions preserve in the form of mending and counting in the register direction of the power that the high position express the most of the materials express 0 it is to express 1 backward It is the algebraical sum of the power of every point of looks to shut the power of looks utilize and shut the active power of the looks direction of the inactive power can make the measurement of power of four quadrants ATT7022B sets up the power direction register specially collects every phase and gaining merit power direction without work which shuts the looks among them
26. benefit user s use The calculation of the power reduced to dividing the looks parameter for original yard by the reading of the register reading of namely the register is two carry figures the high position is 1 o clock HOSA FERC HRB EIO ALB ZS TAT http www hitrendtech com Pagel6 of 34 Rev1 0 HiTrenatecn Application note for ATT7022B 260 CS 108 the most in reading need the reading of the register to fetch the operation with 1 inside out Reading most high position for o clock such as 0 reading there is for yard not original itself after divided by 2 8 to shut looks parameter whether register reading reduce for former yard divided by 2 6 the value calculated out should also be multiplied by coefficient 3200 N N is the pulse constant after the ones that finish the power and gain and compensate are corrected this is the real power Have not adopted several to move the looks wave filter of the work measurement has finished moving 90 degrees of signals of looks to deal with to the voltage signal base on the premise that the signal one reacts and does not decay frequently can move 90 degrees of processing lookses to the sampling signal of 30 1500Hz Power factor and photo corner Base wave the wave in harmony the whole wave divide into the looks power factor of shutting looks and photo corner Power factor and photo corner are all the value with symbol preserve in the form of mending and counting in the register
27. ct and all use the power of unexpected turn of of the base to correct register LineFreqPg in base wave unexpected turn of and apparent electric energy of RMS PQS apparent electric energy volume in harmony of TT7022B Addr 0x31 in power factor cos ju Carry on base wave power is it correct to gain one o clock phase any will do Correct the formula err LineFreqP g l err If LineFreqPg gt 0 gt therefore LineFreqPg INT LineFreqPg al Otherwise LineFreqPg lt 0 gt HiJLineFreqPg INT 2 LineFreqPg 2 The defaulting value of LineFreqPg register is 0x0020C4 generally speaking it need it is in addition it is for base wave whether wave electric energy not apparent not in harmony correct can meet with defaulting value of it by precision request should pay attention to power go on zero clearing operate it LineFreqPg register first before correcting in base wave in harmony wave apparent electric energy too at the same time Set up the pulse constant and enlarge one time of rates In the small electric current in the real school form course inputs cases because of causing school form time very slowly long of electric energy pulse ATT7022B offers the pulse constant to enlarge one time of rates register UERGE RHE CEI ARAINA http www hitrendtech com Page23 of 34 Rev1 0 O Hikrendtech Application note for ATT7022B 260 CS 108 HFDouble through filling in different value of HFDouble register content i
28. d lines do not separate or differentiate GND and AGND do not connect inductor resistor or magnetic bead etc between GND and AGND The big area ground lines don t be stretched in front of the rectifier cell Do not place ground lines under the fixed resistance used for voltage sampling achieves strong and weak electricity separation Decoupling resistor R16 and capacitor C17 C18 should approach to the IC analog part to guarantee good filtering effect Use the resistor network voltage divider sampling circuit VN is connected to the internal circuit through the varistor Interface with the monolithic integrated circuit There are 6 connecting wires between ATT7022B and the monolithic integrated circuit 4 wires are SPI signals CS SCLK DIN DOUT 1 is the ATT7022B reset wire the last 1 is the handshaking wire SIG pay attention to following items 1 ATT7022B uses the 5V power supply when connecting with 3 V power source monolithic integrated chip voltage level transformation is a must The SPI communication wiring should be as short as possible and be shielded by the ground lines otherwise the SPI transmission signals might get interference You can also connect a 10Q resistance WUER CEPHE EA ARAINA http www hitrendtech com Page7 of 34 Rev1 0 Obilrenatecn Application note for ATT7022B 260 CS 108 near chip SPI end and add a decoupling capacitor in the signal input end thus constitute a
29. e configuration SEL is connected to the high level or floats while the energy accumulation method is default to be the algebra value accumulation for the three phase three wire configuration SEL is connected to the low level Through writing calibration register 0x2A the energy accumulation way can be changed should be close to chip CF3 CF4 CF2 pins if the lead wire is long the decoupling capacitor can be placed at the pulse output pin thus obtain good CF1 2 2 The serial resistors at the electrical energy pulse outputs electromagnetism compatibility Power Circuit The next chart is a three phase power supply schematic diagram Rev1 0 Page6 of 34 OUER CERE CEI ARAINA http www hitrendtech com Hikrendtech Application note for ATT7022B 260 CS 108 McwMuscCT U2 Ris lo 2 RVI 2 20KGa b 2 cls UF i 23 pa oIur 100UF M TRANSI x KD ADIAND REEE FAEH vaw RY 2OKGs vit a RYS 20KGs vit The power circuit design is important to the electric instrument performance in order to guarantee the good electromagnetism compatibility please note following several points 1 3 Power supply voltage VCC AVCC should be in 5V 5 25 Suggest a 2200uF filtering capacitor at 7805 output termination GND and AGND are digital and analog power source reference points for PCB wiring connect them with big area groun
30. energy RMS apparent electric energy pulse is exported by CF3 CF4 is invalid While opening PQS apparent state of measuring of electric energy PQS apparent electric energy pulse is exported by CF4 CF3 is invalid While opening the state of measuring of electric energy of unexpected turn of of base CF3 CF4 effective its electric energy pulse output frequency reflect base wave shut looks gain merit and size of inactive power equally can be used in the check up of instrument base wave gaining merit and inactive power can be used as the base wave and gains merit and has no electric energy measurement of work While opening the state of measuring of electric energy of wave in harmony CF3 CF4 effective its electric energy pulse output frequency reflect to shut looks gain merit and size of inactive power equally in harmony wave can be used in the check up of instrument wave gaining merit and inactive power in harmony can be used as the wave in harmony and gains merit and has no electric energy measurement of work ATT7022B offers the whole wave power voltage frequency voltage contained angle power factor photo corner of states etc to measure the parameter whether when ATT7022B opens the base wave or the state of measuring of wave in harmony register these choose register SelectPQSU through parameter Addr 0x3C can also offer the parameters such as corresponding base wave or power of wave voltage power factor and photo corner in
31. equal 0x280 the ammeter is in the state of starting can output the electric energy pulse on the contrary when the value of reading electric current register is smaller than 0x280 the ammeter is in sneaking the state of moving do not output the electric energy pulse Whether power is it is it when segmenting start establishment of electric current can according to following to calculate formula to make to gain Istartup INT G Io 2 23 In the type G is 0 648 Io is the voltage of sample of the chip port while starting the electric current and is input for example start the electric current as 0 4 of the Ib the voltage that Ib samples while inputting is as 0 1V then Io 0 1 0 4 100 0 0004V When the power is gained and corrected by stage the settlement value which starts the electric current is Istartup INT 0 8 G Io 2 23 Namely is multiplied by coefficient 0 8 on the calculating value originally Size of the voltage that the establishment and Ib of starting the electric current sample while inputting relating to the fact that input the non linear degree under the small electric current of circuit users can adjust the arrival electric current value established according to one s own design Voltage Adjustment It is independent for power gaining and phase place to correct that the voltage is corrected the voltage correcting value will sample as a coefficient of varying the voltage will be varied for standard voltage value On te
32. etch absolute value sue for peace way accumulate three phase electric energy shut reverse electric energy of looks it worthes to be always zero Every phase and shutting the looks electric energy register the register of marking 2 after reading of zero clearing since reading a corresponding one its mark 2 register can when the new pulse comes zero clearing too When the chip is fixed again the register quilt zero clearing of electric energy Temperature ATT7022B built in temperature sensitive sticker offer one ADC of 8 sample to export to temperature analyze degree it about 1 degrees Centigrade Low 8 of the register are effective should be worth needing to correct true temperature value is TC TM TC for the correcting value TM is read the data by register the value after calculating should be changed into original yard if the high position fetches and adds 1 instead for one The temperature sensitive sticker needs to pass register GCtrIT7Adc Addr 0x2C make and can be controlled only when Bit of GCtrIT7Adc 2 1 10 is opened Bit 2 1 00 01 11Shut off the temperature sensitive sticker hour Measurement condition choice ATT7022B may establish five kind of measurement conditions Full wave measurement condition RMS apparent electrical energy measurement condition PQS apparent measurement condition fundamental wave measurement condition overtone measurement condition When ATT7022B work the full wave measurement is the basic function
33. ference voltage electric circuit as well as a digital signal processing electric circuit which can measure every electrical parameters including fundamental wave harmonic wave and the full wave fundamental wave harmonic hereafter refers to as full wave This chip can do active power energy reactive power energy and apparent power measurement as well as frequency measurement all phase current effective voltage value power factor phase angle parameters and provides two kinds of apparent electrical energies PQS RMS satisfies the three phase multi purpose electrical energy table as well as the fundamental and harmonic wave electrical energy meter demand fully The ATT7022B internal voltage monitoring electric circuit can guarantee the system works correctly even when the power is on or off The ATT7022B provides a SPI interface which facilitates transmission of the measurement and calibration parameters with exterior MCUs It supports the full range gain the phase compensation namely pure software calibration Active and reactive electrical energy pulse outputs CF1 CF2 can be sent to a standard for error correction And CF3 CF4 output active reactive energy pulse for fundamental wave harmonic wave or RMS PQS apparent electrical energy pulse WER EEEH EO ARAINA http www hitrendtech com Pagel of 34 Rev1 0 HiTrenatecn Application note for ATT7022B 260 CS 108 I Hardware Circuit Design The ATT7022B is 44 pin QFP package
34. g input signals please noth that 1 Regardless of any input design method the direct current bias voltage for input pin VxP and VXN is about 2 45V The bias voltage can be obtained by chip s 11 th pin REFOUT otherwise the chip cannot measure accurately 2 In order to guarantee the measuring accuracy the 2 filtering capacitors outside the chip s 5th pin can t be omitted and should be placed as close as possible to pin 5 and far away from other signals the wiring between pin 5 and these 2 capacitor should be wide and short These ground lines of these 2 filtering capacitors and the sampling signal should be connected as close as possible 3 The resistor 1 2K and capacitor 0 01uF at VxP and VXN input circuit constitute the anti aliasing filter its structure and the component parameters need to be symmetric and uses good temperature performance components thus the electric instrument can obtain good temperature characteristic 4 When any phase current and voltage are at reverse direction chip pin 40 REVP outputs the high level according to this the wiring interconnection is correct or not can be known HOSA PERG HB EHO ARAINA http www hitrendtech com Page3 of 34 Rev1 0 HiTenstech Application note for ATT7022B 260 CS 108 5 gt The chip input pin SEL is connected to the high level is used for three phase four wire configuration while being connected to the low level is used for three phase three wire configurati
35. g value while restoring to the throne Set up the phase place and compensate the area The error of the phase place is asymmetric by the parameter of the circuit with samples of angle difference of the mutual inductor mainly it is caused usually can meet 0 5 grades of requests of electric energy meter if not needing to segment that the signal leaves in the line inconsistently etc namely pay the area for the phase place sets up register 0x02 value of 0x03 0x04 0x05 to keep as zero To the high accuracy electric energy meter such as 0 5S or 0 28 need to do the precision of phase place by stage and correcting it is set up according to the size of the electric current that it segments 4 begins to set up to pay the area for setting up from the phase place the electric current segments minimumly some writes into the phase place and pays the area for and sets up 4 greatest some of segmentation of electric current writes into the phase place and pays the area for and sets up 1 If WUER CEPHE EA ARAINA http www hitrendtech com Page22 of 34 Rev1 0 Hikrendtech Application note for ATT7022B 260 CS 108 click fewer than 4 by stage should compensate the area from the phase place and set up 4 and begin to set up sequentially other some parameters of establishment keep as zero For example pay the area for the phase place divide into two sections and go on click and have locating in 15 of the Ib by stage namely Is4 15 Vi 0 15 0 1
36. he wiring path to power transformer and connection to common sampling end should separate very clearly do not mix up this is very important UERGE RHE CEI ARAINA http www hitrendtech com Page9 of 34 Rev1 0 Oilrendtecn Application note for ATT7022B 260 CS 108 1 3 gt The grounding connection is vital to the electromagnetic compatibility performance pays attention to the power ground and the signal ground junction point RJ4 RJS It I Be 4 ATT7022B has many kinds of power sources VCC AVCC Pay attention that the analog and digital ground should connect together when they are close don t need to differentiate the type So the resistance inductance and parasitic capitance on the ground line can be reduced dramatically HOSA FEURIG HEB EHO ARAINA http www hitrendtech com Pagel0 of 34 Rev1 0 HiTrenatecn Application note for ATT7022B 260 CS 108 5 Pay attention on the position of the decoupled capacitor which on chip power pin Netli1_39 6 REFCAP is reference voltage pin in analog part of the chip it will effect the exactness The decoupled capacitor will enhance the stability of the reference voltage HOSA FERC HEB EA ARASA http www hitrendtech com Pagell of 34 Rev1 0 ObiTienatee Application note for ATT7022B 260 CS 108 7 The pulse output trace is usually to be longer the limiting resistance has to approach the chip 8 Oscillator is a
37. high frequency component there must be copper around the clock trace and other signal trace can t across the clock trace BAER CEE CLE ABR http www hitrendtech com Pagel2 of 34 Rev1 0 ObiTienatec Application note for ATT7022B 260 CS 108 rF a 1 Netu _39 el a 2 b Ule C39 III Software Design SPIR Communication SPI communication form of ATT7022B is the same 8 addresses 24 materials MSB is in the front LSB in behind read it write about register per piece there aren t CS the signals in other words SCLK is the low level when the communication begins CS is from high to low through 32 clock pulse SCLKs CS is from low to high finishes the reading or writing and operating of a register ATT7022B decline in clock along on line to fetch data that one chip computer send from DIN rise along from on line to see datum off to the one chip computer DOUT have The following is reading and operating time sequence HOSA EPRICE EA ARASINA http www hitrendtech com Pagel3 of 34 Rev1 0 Hitrendtech Application note for ATT7022B 260 CS 108 lt ONL Pe a E ELEAL TET ACOO CEON After the one chip computer sends 8 addresses wait to read the materials from DOUT on linly 3 microseconds later at least SPI reads time sequence ReadSpi Com
38. i 2 19 AlInterphase current correct valueIgain 96 62 1 0 548387 gt 0 Igain INT Igain 2 23 0x46318C MOV 20H gt 46H MOV 21H gt 31H MOV 22H gt 8CH MOV A gt 0A6H LCALL WR_SPI B Interphase current correct valuelgain 96 58 9 1 0 629881 Igain INT Igain 2 23 0x509FF2 MOV 20H gt 50H MOV 21H gt 9FH MOV 22H gt 0F2H MOV A 0A7H LCALL WR_SPI C Interphase current correct valueIgain 96 60 1 0 6 Igain INT Igain 2 23 0x4CCCCC MOV 20H 4CH MOV 21H 0CCH MOV 22H 0CCH MOV A gt 0A8H LCALL WR_SPI 3 The filling in fundamental wave survey enables control register EnLineFreq causes ATT7022B to be at the fundamental wave measurement active status MOV 20H 00H MOV 21H 78H MOV 22H gt 12H MOV A 0ADH LCALL WR_SPI 4 The filling in fundamental wave survey and the overtone survey changes to choice register EnHarmonic causes ATT7022B to be at the overtone measurement active status MOV 20H 00H MOV 21H gt 55H MOV 22H gt 0AAH MOV A gt 0BCH LCALL WR_SPI Vice program WUER CEPHE CEI ARAINA http www hitrendtech com Page32 of 34 Rev1 0 HiTrenatecn Application note for ATT7022B 260 CS 108 WR SPI MOV RO gt 20H MOV R3 gt 03H SETB SPI_CS CLR SPI_CK CLR SPI_CS ACALL OTB WR _SPI1 MOV A RO INC RO ACALL OTB DJNZ R3 WR_SPI1 SETB SPI_CS RET Read register operation Input A register is address of read counter parameter register Outpu
39. ineFreq 0x007812 when the fundamental wave survey and the overtone survey cuts the choice register EnHarmonic 0x0055AA the choice fundamental wave table pattern this time CF3 CF4 separately outputs the fundamental wave to active the pulse and the fundamental wave idle work pulse When this time CF3 CF4 the choice overtone table pattern EnHarmonic 0x0055AA the 0x007812 outputs EnLineFreq active the pulse and the overtone idle work to overtone separately gp epmiu en Frequency Hz pulse Explanation The fundamental wave extraction filter to are higher than 3 time 150Hz WBE EAO ARAINA H ar BUFER JG Page5 of 34 Rev1 0 http www hitrendtech com Application note for ATT7022B 260 CS 108 above overtone signals to carry on the weaken Y HiTrendtech S gp epnqiu Be Frequency Hz Explanation The fundamental wave suppression filter carries on the weaken to the fundamental wave signal only retains the harmonic components the fundamental wave attenuation rate above 30dB When designing the electrical energy pulse output you should pay attention to following several points 1 Choose appropriate energy accumulation method three phase electrical energy can be accumulated by algebra or by absolute value After the ATT7022B is reset the energy accumulation method is default to be the absolute value accumulation for the three phase four wir
40. is 1 74 err 0 0174 then acos 1terr 0 5 z 3 acos 1 0 0174 0 5 z 3 acos 0 5087 m 3 0 01007537 lt 0 Phsreg 2 24 0 2 23 16692697 FEB5D9H MOV 20H 0FEH MOV 21H gt 0B5H MOV 22H 0D9H MOV A gt 8CH LCALL WR_SPI MOV A gt 8DH Does not partition writes each section register the similar correct value LCALL WR_SPI MOV A gt 8EH LCALL WR_SPI MOV A gt 8FH LCALL WR_SPI MOV A 90H LCALL WR_SPI 7 Writes the B power gain The three phase voltage inputs 220 volts inputs the B interphase current 1 5 A the power factor is 1 0 the standard table electrical energy error the standard table electrical energy error reading is 1 26 err 0 0126 then 0 0126 1 0 0126 0 01244322 lt 0 l err Pgain HOSA FERC HRB EO ALB ZS TAT http www hitrendtech com Page28 of 34 Rev1 0 HiTrenatecn Application note for ATT7022B 260 CS 108 Pgain 2 24 Peain 2 23 2 24 0 012443222 23 16672834 FE6842H MOV 20H gt 0FEH MOV 21H gt 68H MOV 22H gt 42H MOV A gt 87H LCALL WR_SPI MOV A gt 8AH Does not partition writes each section register the similar correct value LCALL WR_SPI 8 Writes the B phase adjustment The three phase voltage inputs 220 volts inputs the B interphase current 1 5 A the power factor is 0 5L the standard table electrical energy error reading is 1 74 err 0 0174 then 0 acos 1terr
41. ll conveniently add AC sampling signal up to the 2 4V DC bias Figure 2 connects the zero curve and the chip s ground this is suitable in application when the power supply is obtained from self coupling transformer VP R1 V2P Figure 1 Uses the resistance divider to input voltage sampling zero curve connected to reference output Figure 2 Uses the resistance divider to input voltage sampling zero curve is connected to ground WER EEEH EAO ARASINA http www hitrendtech com Page2 of 34 Rev1 0 Hikrendtech Application note for ATT7022B 260 CS 108 REFO REFO TL PT al Figure3 Input voltage sampling using Figure4 Input voltage sampling the voltage transformer using the current transformer In Figure 1 Figure 2 VP and VN are the electrical network voltage in these figures all parameters are designed for 220V reference power supply In Figure 3 PT transform the electrical network voltage for example 220V to the sampling voltage In Figure 4 CT is 1 1 converter for example 2mA to 2mA The electric current sampling is obtained through the current transformer there are several following wiring way IAl R2 VIP Figure 5 electric current sampling differential input Figure 6 electric current sampling single ended input In Figure 5 and Figure 6 IA1 and IA2 are the second order measuring signals The 7 th channel ADC input design can refererence to this kind of network connection When designing samplin
42. lues then ATT7022B is at the fundamental wave measurement active status if does not choose the overtone measurement condition then this step jump Attention The dial gauge is carries on in the corresponding dial gauge register content for under the zero condition Software dial gauge application example Take the 1 5 6 A 220V three phase four tables as the example the design variable is as follows Pulse constant N is 3200imp kWh when nominal current input when the electric current channel input voltage Vi is 0 1V the reference voltage input voltage channel input voltage Vu is 0 1V establishes this table the overtone measurement condition The following program wrote with 8051 assembly languages entrance The A register is the command regarding to write operation or the address regarding reads operation 20H 21H 22H are write register 30H 31H 32H are read register RO register save first address of write or read date the R3 register is the byte number which writes or reads WR_SPI is writes ATT7022B the vice program RE_SPI is reads ATT7022B the vice program DReset ATT7022B RESET7022B CLR ATT7022B_RST MOV R7 20H delay DELAY1 NOP DJNZ R7 DELAY1 SETB ATT7022B_ RST MOV R7 0FFH delay DELAY2 NOP DJNZ R7 DELAY2 HOSA FERC HRB EHO ARAINA http www hitrendtech com Page26 of 34 Rev1 0 HiTrenatecn Application note for ATT7022B 260 CS 108 RET 2 Filling in voltage channel ADC gian UADC
43. mprove light school form speed of electric current power amplification 2 4 8 16 In order to prevent the number value caused of power amplification from overflowing this function is generally used in the test of the electric current under 5 of the Ib Notice the pulse constant enlarging time and leading the form at school to change to go back as 1 after finishing so as not to cause the mistake of measuring Voltage channel ADC gain choice In order to reduce between the channel the crosstalk as well as increases the voltage sampling channel input voltage the scope and the flexibility ATT7022B provides voltage channel ADC gain choice register UADCPga uses in controlling the voltage channel the ADC enlargement factor some 1 2 4 8 16 and so on enlargement factor choices but must pay attention when fills in this control register material OxA5xxxx is the prohibition reads in The suggestion in senate voltage gradient Un time sample signal Vu is 0 1V enlargement factor UVADCPgain 4 like this may obtain the good straight characteristic the guarantee measuring accuracy Set up and start the electric current The preserving value starting the electric current register after being restored to the throne is 0x280 when the corresponding arrival electric current for 0 1 of the Ib Ib to input introduction is 0 1V to sample namely when the value of reading electric current register not making electric current before correcting is greater than or
44. nnected to power VCC in normal operation If connected to GND the chip is always in the reset state SIG is LOW after the chip is reset it becomes HIGH after the chip accepts one WRITE for about 5 uS from the monolithic integrated circuit After checking the above items and all signals work normally it shows the chip is in normal operation otherwise you should inspect the wiring connection is correct or not or if there is any short circuit faulty soldered joint etc BURGHLEY EA ARAINA http www hitrendtech com Page8 of 34 Rev1 0 ObiTienatec Application note for ATT7022B 260 CS 108 II Electromagnetic Compatibility Design Electromagnetic compatibility importantly guarantees the reliability of an electric meter For ATT7022B application there are several suggestions for everybody reference PCB Wiring explanation After the correct schematic diagram design is completed it is transformed into a printed board circuit diagram A good PCB design can get good electromagnetic compatibility performance The next picture is a reference PCB design using ATT7030A l gt Pay attention first to separate strong and weak electrical signals 2 The power line and ground line should be first connected to varistors and then to internal circuits so that to protect internal components The ground line is a very important disturbant conduction route for EFT test pay special attention to ground line wiring After varistors t
45. on 6 gt The three phase three wire electric meter uses two method to do measurement B phase can t be used for electrical energy measurement in the wiring substitute VN in three phase four wire case with VB The voltage sampling inputs V4P and VAN the electric current sampling inputs V3P and V3N can be input the independent signals and their voltages currents power and power factors can be read from the B phase corresponding registers Electrical energy pulse output circuit Below is the active energy pulse signal generation process diagram H Biia yI t CF1 KRR HFreq The voltage and current signals after transformation are multiplied in DSP then the transient state power is obtained after integrating over time they become the electrical energy signals According to the energy accumulation patterns do absolute value adding or the algebraic value adding operation for the three phase electrical energy and the result is transformed to the frequency signal then carries on the frequency division according to the user hypothesis frequency division coefficient obtains the electrical energy pulse output signal which can be used for calibration t2 64 tl Eh AEEA CF1 The reactive electrical energy pulse signal is the idle work transition condition power which in DSP obtains becomes the idle work electrical
46. orrect value in dial gauge register ODH OEH OFH 10H 12H 13H 14H 15H 17H 18H 19H 1AH If partitions makes the phase calibration then the electric instrument in the input three phase voltage according to the phase compensation region division gives A B C separately inputs compensates the region center point the electric current i e check point far away partition spot avoids error beating the power factor is under the 0 5L condition according to each electrical energy error value which obtains writes the phase correct value to dial gauge register 10H 15H 1AH and so on 9 The input reference voltage according to the voltage demonstration value writes the correct value separately to in dial gauge register 1BH 1CH 1DH 10 Inputs the basic electric current according to the electric current demonstration value writes the correct value separately to in dial gauge register 26H 27H 28H The filling in fundamental wave survey enables control register EnLineFreq causes measurement active status which ATT7022B is in needs DIF must choose the harmonic measurement active status enables control register EnLineFreq 0x007812 in the filling in fundamental wave survey after causes ATT7022B to be at the fundamental wave measurement active status then fills in the fundamental wave survey and the overtone survey cuts choice register EnHarmonic 0x0055AA causes ATT7022B to be at the overtone measurement active status if fills in other va
47. rms that open the voltage of wave in harmony to test in order to improve the resolution of the voltage signal propose correcting the voltage to above 400V in ATT7022B deal with from one chip computer into a real voltage signal finally When Un is input for 220V it makes ATT7022B export 440V to correct through the voltage will examine the signal had divided by 2 in the one chip computer get the last measurement value 220V If Un is 100V corrected to 400V will be examined the signal had divided by 4 by the one chip computer while importing get the last measurement value 100V If Un is 57 7V corrected to 461 6V will be examined the signal had divided by 8 by the one chip computer while importing get the last measurement value 57 7V The electric current correcting It is similar to correct with the voltage it is independent for power gaining and phase place to correct that the electric current is corrected the correcting value of electric current will sample as a coefficient of varying the voltage will be varied for standard electric current value The voltage is 0 1 V in the specified electric current that the electric current passway samples the value of the when have not corrected electric current virtual value register corresponding invites about 60A in case of needing to use and shut electric current value of the looks in WUER CEPHE EA ARAINA http www hitrendtech com Page24 of 34 Rev1 0 HiTrenatecn Application note for ATT7022B 2
48. t RO means to use the serial three register to save date of read counter parameter register MOV A 04H LCALL RE_SPI RE SPI MOV R3 03H MOV RO 30H SETB SPI_CS CLR SPI_CK CLR SPI_CS ACALL OTB SETB SPI_DO RE_SPI1 MOV A 00H ACALL INB MOV RO A INC RO DJNZ R3 RE_SPI1 SETB SPI_CS RET OTB MOV R2 gt 08H OTB1 SETB SPI_CK RLC A MOV SPI_DI C NOP NOP NOP CLR SPI_CK DJNZ R2 gt OTB1 RET UERGE RHE CEI ARAINA http www hitrendtech com Page33 of 34 Rev1 0 HiTrenatecn Application note for ATT7022B 260 CS 108 INB MOV R2 gt 08H INB1 SETB SPI_CK OP OP OP MOV C gt SPI_DO RLC A CLR SPI_CK DJNZ R2 gt INB1 RET HOSA FERC HB EIO ARAINA http www hitrendtech com Page34 of 34 Rev1 0
49. t 1 5 60 0 025 can be measuredding value 1 5A Measuring of voltage and electric current looks preface In the application of three phase Line four judge through the order of passing the zero point of measuring the voltage electric current signal whether the looks preface of the voltage electric current is normal So long as the voltage of a phase is lost and pigeonholed the voltage indicates against the looks preface that puts the location So long as there is a phase electric current too that is zero the electric current indicates against the looks preface that puts the location In the application of the three phase the strategic hinterland of China the looks preface of the voltage is judged through the size of the voltage contained angle do not offer the judgement function of looks preface of the electric current at this moment Notice electric current measurement looks of preface is it can make controller their first to need namely school form register 0x30 assignment 0x005678 When base wave wave and electric energy in harmony measure the function and open the electric current can t be opened for a long time while measuring the function against the looks preface In measuring parameter register 0x2C bit3 bit4 provide the state sign that the voltage goes against the looks preface against the looks preface and electric current Lose and press and measure ATT7022B have one broken looks threshold value register as is it get
50. uS the chip is reset then SIG outputs the high level then the monolithic integrated circuit pulls the RESET signal to high level After about 500uS ATT7022B completes the initialization SIG outputs the low level signal hereafter normal SPI operation can carry on Connecting a 0 luF decoupling capacitor at the ATT7022B RESET port to improve its anti jamming ability Judges the chip to work normally or not After turning on ATT7022B system how to judge the chip to work normally or not Please do the inspection from following guidelines 1 N Ww s Check every voltage pin is normal or not After turning on power VCC AVCC should be connected to 5V voltage while VDD chip pin 33 and pin 39 is generated internally with 3V normally VDD pin is used for connecting off chip filtering capacitance do not use it for other purpose nor to connect to any power supply The 5th pin is a reference voltage for internal use The 11th pin is the reference voltage output providing a DC offset bias to external input circuit The normal working voltage of these two pins arrives between 2 3V to 2 7V which is produced by internal circuit Because the ATT7022B measurement part uses digital filter structures therefore in order to guarantee the measuring precision it is suggested to select a 24 576MHz crystal oscillator to inspect if the crystal vibrates normally frequency and vibration range conforms to the requirement RESET Signal 1st pin is co
51. ually is it measure Line zero electric current size to use for virtual value its the same as calculation formula of other voltages electric current to calculate formulae but the 7th No ADC needs to be controlled and opened by bit0 of register GCtr1T7Adc Bit0 1 is opened Bit0 0 are closed Vector quantity sum of the three phase current Offer ATT7022B vector quantity of three phase current and virtual value export can offer size Line zero of electric current measuring with it at application three phase of Line four In order to guarantee the precision of this vector quantity and calculation propose that electric current value and sampled value after correcting are close the correcting value is multiplied by a coefficient get the measurement value in the one chip computer For example under the electric current Ib condition of inputting such as Ib being 1 5A the value of A looks electric current register is 66A before correcting the value of B looks electric current register is 63A the value of C looks electric current register is 61A do the electric current and correct A B C looks electric current value to 60A while correcting in this way let s do by vector quantity and when can guarantee there aren t materials calculated to participate in thus guarantee the precision of the vector quantity sum of the three phase current After the electric current value after correcting of the one chip computer is read are multiplied by coefficien

Application note for ATT7022B

Contents

Download Pdf Manuals

Related Search

Related Contents