User's Guide micro-line R AD4-512/612
Contents
1. 4 2 2 FIFO Read Register offset address 4 read only Here the FIFO can be read with A D values All A D values are 12 bit wide The D11 is the highest and the DO the lowest bit The data is available in a complement of two formats This means that all positive A D converter input voltages have results between 0x000 and 0x7FF and all negative input voltages between OxFFF and 0x800 The data bits D12 to D14 additionally provide the binary coded channel number of the actually read sample 0x0 to 0x7 channel0 channel 1 channel2 D31 DI1D10D9 D8 D7 D6 D5 D4 D3 D2 DI DO x x x x x x x x x x x x x x x x 0 x not used micro line AD4 612 user s guide Page 15 4 2 3 FIFO Status Register address offset 8 read only D31 D2 DI DO elslzlslslslslslslslsistslslslslslsisislslslslslsisisisisl TI x not used The flags of the FIFOs can be read by the FIFO status register DO FIFO empty flag 0 if FIFO is empty 1 if FIFO is not empty DI FiFOhalf full flag 0 if FIFO is more than half full 1 if FIFO is less than half full D2 FIFO full flag Oif FIFO is full 1 if FIFO is almost full 4 2 4 Control Register 1 address offset 8 write only D31 D3 D2 DI DO x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x not used DO INTENA2. Regarding the EGND pins the 15 V rate should not be exceeded because the integrated protection diods can short circuit the analog inputs micro line AD4 612 user s guide Page 26 EGND Plug ESD ground Electro Static Discharge There are four EGND pinson this additional plug With these ground signals possible overloads can be conducted from the analog inputs The pins should possibly be connected with the case ground and the protection ground If they are not available a connection to the analog ground power plug pin 2 and3 is recommended Here the analog inputs are only protected from excessive signal levels and not from electrostatic discharges On the analog input plug thetwoEGND pins can be used to shield the analog input cable Power Plug There is a separate power plug for the power supply of the analog board components Here only pure and potential free voltages should be supplied The voltage should be generated externally e g via a high quality DC DC converter from a digital 5 V voltage Each impure voltage directly affects the quality of the A D conversion The quality of the analog power supplies is measured on the noise and potential free voltages and not on the complete voltage value because all analog voltages on the AD4 612 board are double stabilized with linear regulators All voltages should always be started at the same time incl D 5V The AD4 612 board could be destroyed if it is not fully supplied in
3. 4 parallel port write only 4 FIFO read register read only 8 FIFO status register read only 8 control register 1 write only 12 control register 2 read and write 16 control register 3 write only 20 number of channels write only 24 number of idle positions bit 3 0 write only 28 number of idle positions bit 7 4 write only 32 number of sampling rates per channel bit 3 0 write only 36 number of sampling rates per channel bit 7 4 write only 40 number of sampling rates per channel bit 10 8 write only 44 length of the pause bit 3 0 write only 48 length of the pause bit 7 4 write only 52 length of the pause bit 10 8 write only micro line AD4 612 user s guide Page 14 4 2 1 Parallel Port address offset 4 write only D31 D7 D6 DS D4 D3 D2 DI DO x x x x x x x x x x x x x x x x x x x x x x x x x not used This address is provided for the analog offset and pre amplifier as well as for the E PROM module on the serial DC bus DO DAC_CLKIN clock signal for the analog offset and pre amplifier DI DAC_SDIN data signal for the analog offset and pre amplifier D2 DAC_FSIN framesync signal for the analog offset and pre amplifier D3 DAC LDAC load signal for the analog offset and pre amplifier D4 DAC CLR clear signal for the analog offset and pre amplifier D5 PC Au E2PROM address 0 D6 PC_Al E PROM address 1 D7 PC_A2 E2PROM address 2
4. amplification or attenuation of the input signal The return value includes the actually set amplification factor i e the amplification factor without rounding errors or errors from overranging double SetGaindB int channel double value SetGaindB sets the amplification of the A D converter channel The amplification value is stated in dB The return value is corresponding with the actually set amplification dB double SetOffset int channel double value SetOffset stets the offset of a stated channel The offset voltage is stated in volts with valid values between 3 75 V and 3 V The return value is corresponding with the actually set offset i e without rounding errors and errors from overranging double SetCutOffFreq int channel double value SetCutOffFreq determines the corner frequency of the AD4 612 board s input filter The minimum corner frequency is 0 1 Hz the maximum frequency is 50 kHz The setting is always valid for a pair of channels i e channel 1 and 2 as well as channel 3 and 4 have the same corner frequency The return value is corresponding with the actually set corner frequency double SaveGain int channel double value SaveGain permanently stores the delivered amplification value of Value in the EPROM of the AD4 612 board The return value is corresponding with the actually stored amplification factor double SaveOffset int channel double value SaveOffset permanently stores Value as offset of the s
5. case of devided voltages A 15V Analog positive voltage supply The valid voltage range is 14 V to 16 V A 15V Analog negative voltage supply The valid voltage range is 14 V to 16 V AGND Analog ground High quality ground X 7V Analog positive voltage supply of the A D converter The valid voltage range is 7 V to 16 V The power supply X 7 V can be tapped from power supply A 15 V which means it does not necessarily have to be potential free from the analog power supply XGND Analog ground of the A D converter High quality ground XGND can be tapped from the AGND which means it does not necessarily have to be potential free from the analog power supply micro line AD4 612 user s guide Page 27 7 Solder Bridges 7 1 Input Amplification Input Attenuation With the help of several solder bridges the characteristics of the AD4 612 board s input amplifiers can be separately set for all four channels Through the respective configuration either an amplification 1 lt v lt 4095 or an attenuation 0 lt v lt 1 can be set For amplification pin 1 and 2 and for attenuation pin 2 and 3 have to be connected with each other For each channel two solder bridges have to be configurated simultanously J24 J25 channel 3 amplifier 1 2 0000000000000000000 S 0000000000 attenuation 2 3 KR ecm G Bom son H WER SR CR SCH J21 J22 channel 2 BOR ROR ROE amplifier 1 2 aCe aeaea F Com CC a attenuati
6. need to be pre set correctly The A D converter operates with an input voltage range of 2 5 V This range should be achieved by tuning the pre amplifier and the offset amplifier without overdriving the A D converter For the analog inputs a maximum voltage range of 10 V and a minimum voltage range of 10 mV is possible Here the input signal can have an offset range of 0 5 V or 10 0 V After the correct setting the output of the amplifier should have a maximum voltage level difference of 5 Vss This voltage level difference does not have to be zero symmetrical In order to achieve the required A D converter zero symmetry the offset amplifier has to be programmed respectively The settings of the amplifier and the offset are supported by the supplied C software drivers Direct hardware accesses to the digital level recorder by the application software should be avoided micro line AD4 612 user s guide Page 9 3 6 Programmable Amplification The pre amplifiers on the analog input can be programmed with a 12 bit resolution for each channel These steps can optionally be configurated to amplification or attenuation by closing the respective solder bridges on the AD4 612 board The amplification can be set by the software driver functions Here amplifications smaller than one are automatically converted to the correct A D converter values of the amplification level The amplification additionally influences the upper corner fre
7. signal as level by the signal cable und be connected to the input ofthe AD4 612 board A direct ground connection between the signal provider and the AD4 612 board should be avoided All electric contacts are automatically established when all micro line processor modules are plugged together Here it is important to have a plug in connection which is not polarity inverted and not displaced The 1 pins of all plug rowes should be plugged onto each other and form the ground A 15 V A 15 V 15 V AINn deva A fi AGND GND AINn AD4 612 X47v XGND EGND D 5V 5 V DGND case micro line AD4 612 user s guide Page 36 11 Bus Timing The following timing parameters are important for data transmission via the micro line bus When using fast processor modules 1 to 2 waitstates possibly have to be set for data transmission between the AD4 612 board and the processor module For further information please refer to the respective processor user s guide Read Cycle CSn ter STRB DO 15 Write Cycle CSn STRB DO 15 FPGA Device tes chip select setup time ter chip select release time trd read cycle time tdv data valid time tr data release time twr write cycle time ts data setup time td data hold time trd ltcs tdv tr out EPM7096LC68 15 min Ons min An
8. the number of possible processors and analog channels is virtually unlimited micro line AD4 612 user s guide Page 5 2 MBSC Der MBSC Multiple Burstmode Sampling Controller supports various trigger options e g the Continuous Sampling Mode Triggered Single Shot Burst Mode and Auto Triggered Repeat Burst Mode The Continuous Sampling Mode continuously samples the preset number of channels The Triggered Single Shot Mode samples a programmable number of values only once and then stops the sampling The triggering can be generated by either the external signal TRIG_I O or by the processor The Auto Triggered Repeat Burst Mode and the Single Shot Mode sample a programmable number of values After a programmable pause the sampling automatically re starts A trigger signal synchronising this procedure can also be generated by the external signal TRIG_I O or by the processor This is very important if serveral boards are operating in the parallel mode Here the virtually parallel Phase Optimized Sampling POS is always used Phase Optimized Sampling allows the system to sample the input values of several channels with a minimum phase shift Here the initialized number of active channels is sampled with maximum speed and then idle states are added One control register and four registers are available to set the operation modes which can be programmed via the processor The sample clock Smp CIK is set by the Timer 0 of the programmable timer modu
9. 08 I O EGND 10 D09 I O CS1 1 EGND 11 D1000 3 CS2 1 3 S 12 D1100 3 CS3 1 z 2 13 D12d 0 CS4 1 14 DI30 0 CS5 1 15 D14d 0 CS6 1 I2C_SCL OC 16 DIS O CS7 1 DC SDA OC 17 JINTO OC 18 INT1 OC 19 INT2 OC 20 INT3 OC 21 22 23 24 2 R W 1 2 25 ISTRB 1 d 26 27 28 2 TCLKO I 29 a TCLK1 I BO BI B2 micro line AD4 612 user s guide Page 24 6 1 Pin Discription The pin discription corresponds to micro line standard and is compatible with all micro line processor and peripheral boards Several peripheral boards can be used as piggy pack units and be operated with a processor board when they are plugged onto each other Connector A D00 D15 Theseare thebi directional data lines ofthe mirco line bus They are permanently configurated as inputs andareonlybriefly switched to outputs for external read cycles Connector B A00 A05 These are the address lines ofthe micro line bus They are permanently switched to inputs Connector D DGND Power supply digital ground D 5 V Digital power supply 5V All digital modules are power supplied via this connector The maximum valid voltageis 5 5V RESET Reset input active low for an externally triggered master reset CS1 CS7 Chip select inputs active low One of the CSx signals has tob
10. 10 11 12 13 13 15 Pin Configuration Pin Description Solder Bridges Input Amplification Input Reduction SCF Filter Activation De Activation Channel 1 Corner Frequency 100kHz or 200kHz Interrupt Pins INTO to INT3 Chip Select Signals CS1 to CS7 Test Measuring Access Points Example for MBSC Programming Pin Diagram Bus Timing Power Consumption AD4 612 Board Dimensions Ambient Temperature Ambient Humidity micro line AD4 612 user s guide 24 25 28 28 29 30 31 32 33 34 36 37 38 38 38 38 Page 3 I General 1 1 Introduction The analog data system micro line AD4 612 is a high performance universal and compact analog front end platform offering many solutions for many different applications ORSYS priority was to develop a high performance and extremely user friendly interface This is for instance reflected in the fully programmable and on board storable operation input timer parameters Non advantageous potentio meters are not required anymore The result is a more efficient and considerably more compact system with less trouble shooting The system is equipped with the micro line standard bus and can be connected with all micro line processor boards as a piggy pack unit The system can easiliy be connected with various microprocessor and microcontroller boards due to the exclusive use of standard bus signals If this is the case a peripheral standard unit needs to be co
11. 12 src The variable EEPROMerror is set to 1 if the access to the EPROM of the AD4 612 board runs into a time out double Offset 8 operat c in ad4_612 src double Gain 8 operat c in ad4_612 src long CutOffFreq 8 operat c in ad4_612 src These three vectors reflect the offset values the amplifications and corner frequencies of the AD4 612 board s single channels The values stored in the vector have to be activated if the respective parameters of a channel are changed struct AD_4 612 STRUCT ad4_612 operat c in ad4_612 src This structure includes the AD4 612 board s operation parameter It is not allowed to directly manipulate the included values micro line AD4 612 user s guide Page 18 5 2 Functions 5 2 1 Initialisation operat c in ad4_612 src int OperationMode int NrOfChannels int NrOfSamples int PauseLength int Mode int InterruptMode long SourceFreq long SampleFreq int IOBaseAddr The operation mode is for the basic setting of the AD4 612 boards The settings are not stored permanently NrOfChannels The number of channels to be read NrOfSamples The number of samples in a burst of the Single Shot Burst Mode PauseLength The pause between two burst packets in the Repeat Burst Mode Mode Master slave and single shot operation of the AD4 612 board Here the in the AD4_612 A file defined constants SLA VE MODE MASTER MODE und SIN GLE SHOT apply In order to activate the s
12. 3 are connected SCF filter is active micro line AD4 612 user s guide Page 29 7 3 Channel 1 Corner Frequency 100kHz or 200kHz The corner frequency of the post connected fixed low pass SCF filter on analog channel 1 can optionally be set to 100 KHz or 200 KHz Here two solder bridges have to be configurated If J16 and J17 are closed a corner frequency of 100kKHz is set delivery state If both solder bridges are open the low pass filter is set to 200kHz Both solder bridges always have to be either open or closed at the same time sees KAELL ly Si Com ae apa m oa aT Te am nia H Je el III TED pre pum G 5 n da Jr O KIRSCH oT a n6 ROB BOB en e SCH KOCH aoe wie VU EDE om SCH ale uu ma DI nl HESE 1f WW SR 508 KON SCH ms a RR sE D A Gi zen H 208 108 EOS eee Meeceeeeeeceeeeeee0ee0e0e00c000000 J16 J17 low pass filter channel 1 closed 100kHz open 200kHz In the delivery state J16 and J17 are closed they are tuned to 100kHz micro line AD4 612 user s guide Page 30 7 4 Interrupt Pins INTO to INT3 Due to the AD4 612 board s functionality an interrput signal can be triggered to a plugged on processor module Here the used interrupt port INTO INT1 INT2 or INT3 has to be set for each solder bridge A closed solder bridge activates the respective interrupt All othe
13. AD4 612 user s guide Page 35 10 Pin Diagramm The kind of power supply can be looked up in the diagram The analog voltage sources should be noise and potential free Here high quality DC DC converters can be used All voltages should always be started simultanously incl D 5V The AD4 612 board could be destroyed if there is no complete power supply in case of devided voltages The analog input signals should be transmitted via shielded ports from the signal source to the AD4 612 board The shield can be connected to the EGND pins of the analog input plug It is important that the EGND pins of the EGND plug are connected to the case ground and possibly also to the protection ground If these components are not available the EGND pins can alternatively be connected to the analog ground AGND However this results in the loss of the ESD Electro Static Discharge protection leaving only a simple signal overload protection In general it is important that no system ground loop is built up by the shield Usually the shield is only grounded on one side either on the signal providing ground or on the AD4 612 ground If the signal provider has a differential output then the output is connected to the input of the AD4 612 board The same applies to the input If the signal source has only one ground analog signal and not a differential signal available the ground of the signal provider should be transmitted together with the wanted
14. CLKI on the micro line bus These input ports can be used when serveral AD4 612 boards are operating synchronously or when a very low SMPLCLK is used The use of an external conversion might be necessary if a certain sampling rate is required which cannot be devided by 10MHz e g 600 kHz by 10 MHz The clock generation is supported by the supplied C software drivers and should not be addressed directly by the application software Clock Generation Block Diagramm analog channel 0 SCF analog channel 1_ ey al AID FIFO converter analog channel 2 SCF analog channel 3 10 MHz start of conversion timer 1 timer 2 TCLKO timer timer 0 OUT 0 TT MUX 82C54 aon MBSC TCLK1 sample clock 0 1 Hz 600 kHz micro line AD4 612 user s guide Page 8 3 3 The Display Function of the LEDs The AD4 612 board has a green and a red LED The green LED turns on with the Start Of Conversion signal of the A D converter the red LED turns on with the FIFO full flag During normal AD4 612 board operation the green LED becomes brighter if the sample pause relation becomes more intense In case of very low sampling rates lt 10Hz the light gradually changes to a low frequency blinking what provides a good reception of the A D converter activities The red LED light should not come on during norma
15. EF interrupt enable FIFO not empty The interrupt becomes active if the FIFO is not empty 1 means that the interrupt is activated 0 turns the interrupt off The active interrupt port can be switched via a respectively configurated solder bridge from INTO to INT3 DI INTENA HF interrupt enable FIFO half full The interrupt becomes active if the FIFO is at least half full 1 means that the interrupt is activated 0 turns the interrupt off The active interrupt port can be switched via a respectively configurated solder bridge from INTO to INT3 D3 FIFO RESET FIFO reset The reset for the FIFO starts if a 1 is written into this register The write triggers a short reset impulse A write of a 0 has no effects micro line AD4 612 user s guide Page 16 4 2 5 Control Register 2 address offset 12 read and write D31 D3 D2 DI DO x x x x x x x x x x x x x x x x x x x x x x x x x x x x x not used DO PC SCL PC bus serial clock 0 puts the port I2C_SCL to ground 1 puts the port DC SCT on not busy status open collector with pull up After a reset the port is on 1 which means not busy The read results of this register reveal the status of the I2C_SCL port D1 PC SDA PC bus serial data 0 puts the port I2C_SDA to ground 1 puts the port I2C_SDA on not busy status open collector with pull up After a reset the port is on 1 which means not bus
16. User s Guide micro line AD4 512 612 Edition 11 97 V1 20 Orsys Orth System GmbH Am Stadtgraben 1 88677 Markdorf Germany phone 49 0 7544 9561 0 fax 9561 29 e mail sales orsys de www orsys de micro line is a registered trademark of Orsys Orth System GmbH Markdorf Germany Index 1 General 1 1 Introduction 1 2 AD4 612 Block Diagram 1 3 Analog Inputs 1 4 Anti Alias Low Pass Filter 1 5 Multiplexer 1 6 A D Converter 1 7 FIFO Buffer 1 8 Phase Optimized Sampling POS 1 9 Triggering 1 10 Synchronous Parallel Operation of Several Modules 2 MBSC 3 AD4 612 Operation 3 1 Master and Slave Mode 3 2 Clock Generation 3 3 The Display Function of the LEDs 3 4 Analog Inputs 3 5 A D Converter Control 3 6 Programmable Amplification 3 7 Programmable Voltage Offsets 3 8 Examples to program Amplifications and Offsets 3 9 Anti Alias Low Pass Filter 3 10 Multiplexer 3 11 E 7PROM 4 Register Description 4 1 Timer 4 2 Registers 4 2 1 Parallel Port 4 2 2 FIFO Read Register 4 2 3 FIFO Status Register 4 2 4 Control Register 1 4 2 5 Control Register 2 4 2 6 Control Register 3 5 Software 5 1 Global Variable 5 2 Functions 5 2 1 Initialisation 5 2 2 Adjusting and Storing of Parameters 5 2 3 Calibration micro line AD4 612 user s guide A LN np nn On E E A 14 14 14 15 15 16 16 17 17 18 18 19 19 20 23 Page 2 6 1 7 1 s 71 3 7 4 7 5
17. accesses from the application software are not allowed The necessary functions to control the AD4 612 board are combined in a library Translated versions provided for the Texas Instruments DSPs C3x C44 and C203 can be found in the respective sub directory of the installation disc For the micro line boards C203CPU C31CPU C32CPU and C44CPU translated example programs can be found in the sub index example The example programs in the sub directory example have to be connected with a terminal incl the following parameters 19200 baud 8 data bits 1 stop bit no parity no handshake line skip LF ASCII 0x0D The libraries for the floating point DSP board are translated for the small memory model with the stack parameter delivery Libraries with other operation models can be created with the help of the mk30 exe program the respective sources can be found in the source directory of the AD4_612 src library The application of the mk30 exe program is described in paragraph 6 of the TMS320 floating point DSP optimizing C compiler user s guide The TMS320C203 library version requires the functions of the io_port obj file Therefore the file has to be entered into the linker command file and then be copied to where it can be found by the linker e g the project directory The function prototypes and declarations of the global variable can be found in the include file ad4_612 h 5 1 Global Variable int EEPROMerror eeprom c in ad4_6
18. ampling samples of all high speed channels or a reduced programmable number of channels can be read in regular intervals and programmable breaks can be added until the procedure isre started This isimportant because the analog values of various input channels need tobe read with minimum phase shifting For example the sample phase shifting of the different channels is only 1 7 of the sampling rate if 4 channels are each sampled with 10 kHz 1 9 Triggering The Multiple Burst Mode Sampling Controller MBSC from ORSYS supports three types of board operations In the Continuous Sampling Mode the AD4 612 board operates continuously in the Triggered Single Shot Burst Mode a single burst is started with programmable length per external TTL trigger signal or by software triggering and in the Auto Triggered Repeat Burst Mode an automatic trigger repeat rate can be adjusted tocontrol acyclic burst repeat process A separate TTL trigger signal is available for each board when several boards are operating synchronously 1 10 Synchronous Parallel Operation of Several Boards Several AD4 612 boards can drive parallel and synchronously Each board can be exactly parallel sampled byeither one POS channel or bya large number of POS channels with a sampling rate of up to 600kHz per channel The synchronous operation of the AD4 612 board can generate a tremendous amount of data which is processed by several parallel operating processor systems Thus
19. e MASTERMODE int InterruptMode 0 long SourceF req 10MHz long SampleFreq 10kHz equivalent to 100us int IOBaseAddr I_O_PORTI The parameter IOBaseAddress depends on the configuration of the total systems The solder bridges to determine the base address of the AD4 612 board are described in paragraph 7 5 SampleFreq determines the distance of two samples which is consisting of a sampling value for each channel and is stated in Hertz The parameter SourceFreq specifies the frequency of the clock source of the AD4 612 board Besides the 1OMHz oscillator on the AD4 612 board an external signal can be supplied with the ports TCLKO and TCLK1 of any frequency The selection of the clock source is carried out with function SourceC1k The frequency is stated in Hertz The InterruptMode determines whether and when the AD4 612 board generates an interrupt This applies if the FIFO of the AD4 612 board is not empty or more than half full There are no interrupts used in the example The header file AD4_612 H defines constants for interrupt masking an example for an Interrupt Service Routine can be found in file ADTEST C Mode describes the operation mode of the AD4 612 board Master and slave modes are either possible continously or by single shot During the master mode the AD4 612 board starts a pulse to the TRIG_I O port in the beginning of each cycle during the slave mode the clock is started by a pulse to the TRIG_I 0O por
20. e activated in order to enable the processor board to access the AD4 612 board Solder bridges select one of the seven chip select signals directed totheentire system configuration on the micro line bus Itisimportant that twoor several peripheral boards must not be operated with the same chip select signals but be configurated differently which means that they are accessible by different I O addresses of the processor board INT0 INT3 Interrupt outputs active low open collector One ofthe four interrupt outputs INTn can be activated by a solder bridge in order to signal an interrupt to the processor board If several peripheral boards are operated on the micro line bus each board should be configurated to a separate interrupt signal If this is not possible several hardware interrupt lines can be connected together because of the open collector feature The interrupt service routine then has torecognize the active interrupt source by respective polling R W The AD4 612 board s read write input signals In the high state a read access and in the low state a write cycleis signaled micro line AD4 612 user s guide Page 25 ISTRB The AD4 612 board s strobe input signal active low signals an external read or write access Connector E TCLKO TCLK1 Timer clock input signals Instead of the internal 10 MHz oscillator the clocks can be configurated as system time base Connector X The eXpander connector is for expa
21. ered because the post connected low pass filters with a corner frequency of 100 kHz become invalid when small SCF corner frequencies are used This helps avoiding SCF clock feedthrough This effect will be even stronger if the set SCF corner frequency and the A D converter drive become smaller micro line AD4 612 user s guide Page 12 3 10 Multiplexer The multiplexer is automatically controlled by the MBSC Here the multiplexer channels 0 to 3 are switched to the analog inputs to 4 For testing and comparisons channel 4 is switched to ground voltage 1 25 V channel 5 to 2 5 V and channel 6 and 7 to ground Classification of the multiplexer inputs multiplexer channel input 0 analog input 1 analog input 2 analog input 3 analog input 4 reference voltage 1 25 V reference voltage 2 5 V OV OV NAD BWN rz 3 11 EPROM The AD4 612 board has an integrated serial E7PROM type 24C02 with an PC bus interface to permanently store adjustments of the operating parameters With the zero balancing the offset and amplification delivery state amplification 1 offset 0 can be stored to the permanent memory During reset the adjustment parameters can be read from the E7PROM and do not have to be balanced to zero again The ports of the DC bus interface are addressed via the control register 2 address 12 They are I2C_SCL serial clock and I2C_SDA serial data Die PC bus ports lead to the outside in order
22. ingle shot operation the constant SINGLE SHOT has to be connected with the MASTER MODE or SLAVE MODE constants Performing an OR operation of the constant SS and either MM or SM activates the single shot operation InterruptMode Determines whether the half full flag or the empty flag of the FIFO triggers an interrupt Here the in the AD4_612 h file defined constants INTENA_EF or INTENA_HF apply SourceFreq The clock frequency of the 82C54 timer The value corresponding with the frequency of the chosen clock source by the SourceClk SampleFreq The sampling rate of the AD4 612 board IOBaseAddr The base address of the AD4 612 board OperationMode returns a 1 if an error occured otherwise 0 An example for the interrelation of the channel number number of bursts pause length and sampling rate is provided in paragraph 9 void SourceClk int Mux The SourceClk chooses the clock source for the 82C54 timer There is a choice between the internal 10MHz clock or the two external clock inputs TCLKO or TCLK1 of the micro line bus The corresponding constants are defined in the AD4_612 h file void Start void Start starts the AD4 612 board with the parameters set earlier In the Single Shot Mode the sampling has to be re started after each burst by the command start micro line AD4 612 user s guide Page 19 void FIFOReset void FIFOReset sets back the FIFO of the AD4 612 board void Reset void Re
23. is between 50 and 100 The return value is corresponding with the actually stored ratio int RecallSCFRatio void RecallSCFRatio reads the valid relation for the used filter module between the clock frequency and corner frequency from the E7PROM of the AD4 612 board long SaveMaxConvFreq long Rate micro line AD4 612 user s guide Page 22 SaveMaxConvFreq permanently stores the AD4 612 board s valid maximum sampling rate in Hz of the A D converter in the E7PROM This setting is carried out by the manufacturer during the first operation and should not be changed The valid range is between 500kHz and 600kHz The return value is corresponding with the actually stored maximum frequency long RecallMaxConvFreq void RecallMaxConvFreq reads the AD4 612 board s maximum valid sampling rate in Hz from the EPROM of the AD4 612 board The maximum valid sampling rate is used for the A D converter 5 2 3 Calibration calib c in ad4_612 src The functions in calib c balance the offsets ofthe AD4 612 board s input amplifiers AdCalib adjusts the offsets without permanently storing the received values CalibAndSave permanently puts the received offset values to the E7PROM of the AD4 612 board It is important to know that the EPROM technology does not allow an unlimited number of write accesses The used module allows a maximum of 100 000 write accesses Therefore unnecessary write accesses should be avoided double AdCalib long SampleCo
24. l AD4 612 board operation The red LED shows a warning signal if a FIFO overflows In this case the processor is unable to take the pending data from the FIFO fast enough and a data loss occurs If a FIFO overflow is recognized the FIFO device has to be put into the basic state by a FIFO reset control register 1 bit D3 3 4 Analog Inputs Each of the four analog inputs provides a programmable pre amplifier an offset amplifier and an anti alias low pass filter The amplification and the offset can be pre set by digital final control elements The anti alias low pass filters are pre set by programmable timers of the 82C54 module The filters can be by passed by several solder bridges on the AD4 612 board as the low pass filters do not exceed the maximum corner frequency of 50kHz Here several solid Butterworth low pass filters of 2nd order come into position The corner frequencies 3dB attenuation are then set to 100 or 200kHz for channel 1 and to 100kHz for channels 2 to 4 The MBSC automatically switches the analog multiplexer MUX Block diagram of the analog input channel maximum 5 Vss maximum LESSER 2 5 V 2 5V analog input high speed differential SE MUX AID 10mV converter 10V A A D D amplification offset frequency 3 5 A D Converter Control In order to receive a good A D converter performance the channels always
25. lave mode The difference depends on the handling of trigger signal TRIG_I O In the master mode the trigger signal is generated by the AD4 612 board and can be used as input trigger signal for other boards which are then operating in the slave mode The trigger signal is switched to an output in the master mode and to an input in the slave mode The programming can be performed in control register 3 address 16 If several boards are operating in parallel only one board can operate as master and all other boards have to be configurated as slaves After reset the AD4 612 board is in the slave mode The AD4 612 board must remain in the slave mode if triggered by an external trigger master 3 2 Clock Generation The A D converter requires a pulse called Start Of Conversion With each Start Of Conversion a value is sampled by the A D converter and written into the FIFO The Start Of Conversion pulse is generated by the MBSC This requires a system clock called sample clock SMPLCLK The sample clock is generated by the Timer 0 of the timer module 82C54 The SCF low pass filters of the analog inputs are also clocked by the timer module In this case timer 1 supplies the filters of analog channels 0 and 1 and timer 2 the filters of analog channels 2 and 3 The input clock of the timer module can be chosen from a multiplexer providing three options It can either be a OMHz clock intergrated on the AD4 612 board or one of the input ports TCLK0 and T
26. le 82C54 The output signal of the MBSC is Start Of Conversion which controls the A D converter A value is sampled with every impulse of Start Of Conversion Block Diagram of the MBSC WR number of channels comparator lt SmplClk TRITO start of conversion 82C54 SmplClk WR number of idle positions st number of sampling rates per channel comparator lt clear ES F TRIG_I O comparator PR A length ofthe break micro line AD4 612 user s guide Page 6 The MBSC triggers the Start Of Conversion impulse for each sample For Phase Optimized Sampling POS the number of programmable channels is sampled one after another and then idle states are added The following illustrations explain and show the differences between the number of channels number of idle states number of samples and length of the pause for the above mentioned modes sample 1 sample 2 start of conversion Ed KH E channel channel 2 channel n channel 1 channel 3 channeln Continuous Sampling Mode sample 1 sample 2 sample 3 sample n idle idl idle Pd start of conversion Ill Ill channel 1 SW n start of conversion Auto Triggered Repeat Burst Mode micro line AD4 612 user s guide Page 7 3 Operation of the AD4 612 3 1 Master and Slave Mode The AD4 612 board can operate in the master or s
27. n int Channel double Gain double Offset long CutOffFreq OfflineBoardCalibration permanently stores the values Gain Offset and CutOffFreg as parameters of the channels which are specified Channel in the E PROM of the AD4 612 board The delivery parameters for amplication offset and corner frequencies actually return stored values micro line AD4 612 user s guide Page 23 6 Pin Configuration connector pin 1 pin 32 for analog connector A inputs connector B memo peed coy Oa a De ecm 8 Bes am s SR W Fi ON SCH 108 KOR E 08 108599 Com 08 ROR UW e ROS ate S LR S oun RUS ni e o connector X e H fol ele E WWW 5 lo SETH LS ce TT nce GL edd KANARA e e Beeee000808008088 0808800880800 0800880 pin 1 tL 9eee0e000808008088 0808800888008 0008 power i nio connector D pin 1 connector E connector 4 ESD ground EGND micro line connector C is not occupied Pin connector A connector B conncetor D connector E connector X input power 1 DOO I O A00 1I DGND I TRIG_Y O VY O Z AIN1 A 15V 2 DOI I O A01 1 DGND I S lt AINI AGND 3 DO2 O A02 1 DGND I x AIN2 AGND 4 D03 I O A03 I DGND I AIN2 A 15V 5 D04 I O A04 1 D 5 V 1 AIN3 6 D05 I O A05 I D 5 V 1 AIN3 X4 7V 7 DO6 O AIN4 XGND 8 DO7 O RESET 1 2 2 AIN4 9 D
28. nd 3 The corner frequencies 3dB attenuation of the filters are 1 50 of the input clocks The settings of the corner frequencies are supported by the supplied C software drivers Direct hardware accesses from the application software are not allowed The programmable SCF filters are followed by fixed low pass filters of 2nd order 12 dB Octave Butterworth characteristic in order to attenuate clock emmissions of the SCF filters The SCF filters can furthermore be totally de activated by passed by several solder bridges on the AD4 612 board to support the input signals gt 50kHz In this case only the fixed low pass filters are used The frequencies of the filters following are 200kHz or 100kHz each solder bridge can set separately for channel 1 and 100 kHz for channels 2 to 4 The frequency information always shows the 3 dB attenuation After changing the solder bridges another zero balancing of the AD4 612 board should be made as the offset rates of the input channels could have changed If the SCF filter of channel 1 is operated with corner frequencies lt 8 kHz the solder bridges of the following low pass filter should be set to 100 kHz basic state after the delivery state in order to effectively attenuate possible SCF clock feedthrough This is especially the case when the A D converter is tuned to a low rate If the SCF filters operate with corner frequencies lt 4 kHz a light digital post filtering via software can be consid
29. nnected with the signals DO D15 data AO A5 addresses CS chip select R W read write STRB strobe INT interrupt and RESET The supplied C source code software drivers enable an operation with practically all common target hardware ANSI C compilers for any target systems 1 2 AD4 612 Block Diagramm micro line SR 3 parallel i i high speed 512 sample bus interface __ A D FFO re converter buffer amplification offset frequency 5 x 2 analog E on 2 amplification offset frequency E MBSC Controller analog Bo system timer on 3 DC 2 wire amplification offset frequency extension interface analog on 4 amplification offset frequency E PROM 1 3 Analog Inputs Theanalog data system AD4 612 has four differential analog inputs with a voltagerange of 10V to 10V The software programmable 12 bit pre amplifier and offset pre amplifier enable AD4 612 board operations in the input range of 10mV and 10V with any valid offset voltages The input resistance per channel is 20 kOhm 1 4 Anti Alias Low Pass Filter The integrated Bessel low pass filters are of 8th order and have an attenuation of 48 dB Octave The corner frequencies are software programmable and can be set from 0 1Hz to50 kHz There are additional solder bridges on the AD4 612 board in order to achie
30. nsions of the micro line bus and exclusively reserved for peripheral systems TRIG_I O Trigger signal active high for the Multi Burst Sample Controller MBSC Ifthe AD4 612 board operates in the slave mode the pin is switched toinput and if the AD4 612 board operates in the master mode the apin is switched to output The impulse length for the trigger signal should bea clock cycle of the Smplclk Theimpulse length must not be larger than the length ofa sample because multiple triggering could be started DC SCT The I C bus serial clock is an open collector signal with integrated pull up resistor I2C_SDA The PC bus serial data is an open collector signal with integrated pull up resistor Analog Input Connectors AIN1 AINI AIN2 AIN2 AIN3 AIN3 AIN4 AIN4 Theyarethe analog inputs of channel 1 to4 Theinputresistanceis 20 kOhm They are differential inputs with the signals AINI to AIN4 with and signals available If the signal source has only one ground related nota differential analog signal available the ground of the signal provider should be transmitted by the cable signal together with the user signal as level and be connected with the input of the AD4 612 board If possible no direct mass connection between the signal provider and the AD4 612 board should be made This method reduces possible voltage noises The voltages of the pins should in opposite to the pins not exceed the maxium rate of 11 V
31. on It is not allowed to directly call up the function SetIdle Instead all settings regarding the timing of the data conversion should be carried out by the function OperationMode 5 2 2 Adjusting and Storing of Parameters params c in ad4_612 src The following functions set the AD4 612 board s operation parameters When using the functions to memorize parameters in the AD4 612 board s E7PROM it is important to know that the EPROM technology allows only a limited number of write cycles The used module is specified with at least 100 000 write cycles Therefore unnecessary write accesses have to be avoided void RecallAll void RecallAll reads all amplification offset and corner frequency values for all channels from the EPROM of micro line AD4 612 user s guide Page 20 the AD4 612 board The values for the maxium sampling frequency and the SCF clock frequency are initialized Recall AlIlI reads the E7PROM only if the version of the parameter sentence called up by the Recall Version corresponds with the constant STD_directly VERSION in the ad4_612 h data sheet Otherwise the offset values are set to zero the amplification values are set to one and the corner frequencies to 20 kHz double SetGain int channel double value SetGain sets the amplification of the A D converter channel The values of Value range from 0 to 4096 Depending on the setting of the solder bridges on the AD4 612 board there is either an
32. on 2 3 Deiere mie aie 1 1 EOE nn ND Jo III spoleto af EDE CH sos Us J18 J19 channel 1 EE Eer amplifier 1 2 attenuation 2 3 08 20E ee me o KR A BOE ma e EOE EOE 8 J19 327 g 208 E ZP BA CT 116 WD 327 528 channel 4 amplifier 1 2 attenuation 2 3 In the delivery state pins land 2 are connected amplification is set micro line AD4 612 user s guide Page 28 7 2 SCF Filter Activation De Activation In order to activate or de activate bypass the SCF filters one solder bridge has to be configurated for each analog channel In order to activate the SCF filters delivery state pins 2 and 3 each have to be connected with the respective solder bridges In order to de activate the SCF filters pins 1 and 2 have to be connected with the respective solder bridges J26 channel 3 SCF bypass 1 2 0000 0000000000000 0006000000008 H 00000000000000000000000 SCF active 2 3 KR E SCH BOB ROE W DM Ce J ai sci J23 channel 2 08 aoaea Com SCF bypass 1 2 GE ive 2 3 em oa conii ot To BEN Gendt Oe ST 2 Je el m a 129 PG H ae Tr a le im SH Sg eh RER SCH KOR ECH BOB OR e cous sige SAS J29 channel 4 J20 channel 1 SCF bypass 1 2 SCF bypass 1 2 SCF active 2 3 SCF active 2 3 In the delivery state pins 2 and
33. plification voltage after the amplification level offset voltage of the A D converter 1Vss zero symmetrical OV Offset 2 5 2 5Vss 0 3V by component tolerance drives 2 5Vss 100 drive 4096 2 5 1638 0 3V 3 75V 6 75V 4096 2457 Otol V 5 Oto5 V 2 6 V 2 5 V by input offset 0 1 V by component tolerance drives 2 5 to 2 5 V 100 drive 3to6 V 0 64 1 9 to 3 8 V 3 0 V 2 9 V by input offset 0 1 V by component tolerance drives 1 to 1 V ony 40 drive possible 5 V bis 1 V 0 83 4 17 V bis 0 83 Vo 1 57 V 1 67 V by input offset 0 1 V by component tolerance drives 2 5 bis 2 5 V 100 drive micro line AD4 612 user s guide Page 11 3 9 Anti AliasLow Pass Filter The input channels are equipped with Maxim SCF low pass filters of 8th order They show an attenuation of 48 dB Octave The used standard type MAX296 operates with Bessel characteristics with the result of consistently good transient qualities despite the high attenuation As an alternative the AD4 612 board can be equipped with a MAX295 Butterworth characteristic filter type to further increase the operation frequency of the attenuation with the consequence of less favorable transient qualities and phase behavior see data sheets in the appendix The filters are clocked with the timer module 82C54 Here timer 1 supplies the filters of analog channels 0 and land timer 2 the filters of analog channels 2 a
34. quency of the anolog input channels due to general operational amplifyer features The upper corner frequency decreases depending on the tuned amplification This can be realized at about a 10 and has a tremendous effect when huge amplifications a 100 1000 apply This effect does not apply if the amplifier is only used for attenuation Maximum cut off frequency depending on the amplification Cut off frequency SCF bypassed N s a CH Channel 1 m Channel 2 4 Cut off frequency kHz g 8 ke Lo CH LO CH Q Q O y ym N Del CH LO ke N 1000 Amplification a 3 7 Programmable Voltage Offsets The voltage offsets of the analog inputs can be programmed with a 12 bit resolution for each channel The voltage offsets can be directly provided in V to the software driver functions micro line AD4 612 user s guide Page 10 3 8 Examples for Programming Amplifications and Offsets for Maximum A D Converter Control Example 1 input voltage amplification voltage after the amplification level offset voltage of the A D Converter amplifier DAC rate offset DAC rate Example 2 input voltage amplification voltage after the amplification level offset voltage of the A D converter Example 3 input voltage amplification voltage after the amplification level offset voltage of the A D converter Example 4 input voltage am
35. r interrupt solder bridges must remain open In the delivery state solder bridge J9 is closed which means that INTO is active D D D D D D D D 00ccc0cccocco0ocoon cececccoecccococcoceocon WR pa HEE LIL NN WR ION III III WIR EDE EDE WR WR EDO meee EF place J9 interrupt 0 INTO active place J10 interrupt 1 INT 1 active place J11 interrupt 2 INT2 active place J12 interrupt 3 INT3 active In the delivery state J9 is closed meaning INTO is activated micro line AD4 612 user s guide Page 31 7 5 Chip Select Signals CSI to CS7 Every peripheral board on the micro line bus has a separate chip select signal Therefore it can be addressed by the processor module on an own I O address Here one chip select signal must be selected from altogether 7 possible chip select signals The selection takes place on the AD4 612 board by configurating solder bridges J2 to J8 A closed solder bridge activates a chip select signal All other chip select signals must remain de activated which means that their solder bridges are open In the delivery state solder bridge J 2 is closed which means it is CS1 active ceocccocoeoeH SOCCCOCOH ae III GEE DIR EDE EOE WR WR RSR WOR WOR EDE WR Ei D Heeeeeee place J2 chip select 1 CS1 active place J3 chip select 2 CS2 active place J4 chip select 3 CS3 active place JS chip select 4 CS4 acti
36. s min 45ns min 40ns max 25 ns min 45ns min 25ns min 5ns micro line AD4 612 user s guide Page 37 12 Power Consumption The following table shows the characteristic power consumption ofthe AD4 612 board Minor alterations depending on the sampling rate and the clock frequency of the connected processor are possible The entire power consumption of the AD4 612 board is about SW Due to the small design a warming of the AD4 612 board is possible and it is important to have sufficient ventilation Under normal circumstances the natural convection is sufficient for cooling Mandatory ventilation may be necessary depending on the warming of the plugged on processor module and the size of the used case voltage input voltage range ch power consumption D 5V 4 3 4 0 DIV 200mA X 7V 7 16V 10mA A 15V 14 16V 120mA A 15V 14 16V 110mA 13 AD4 612 Board Dimensions 120 2 54 145 5 5 25 M ececeee0e0e00e0e00000000000000000060 RR ss ea ER na ST pats e EOE eeh Com BDE aCe ae nOn CEV KR nn KS ma 2 O m ee na ER L je Cen n 1s an EN Eroa BOE aa ce sie en 254 mm SR el ae ansa e e e L ged Om 67 585 e e e e Gs ele ee Gs ee ee ele TET ee Jee ia 254 15 24 14 Ambient Temperature Storage 25 C
37. set sets the amplification of all channels to one and sets an offset rate of zero double SampleClk double SampleFreqPerChannel SampleClk sets the number of samples per second which have to be read for each channel SampleClk uses the functions SetConvClk and SetIdle The function SampleClock should not be called up directly instead all settings regarding the timing and data conversion should be carried out by the function OperationMode long SetConvClock double ConvFreg SetConvClock sets the sampling rate of the A D converter i e the distance between the two values of a sample This value influences the phase relation between the sampling rates of the different channels as well as the 82C54 timer frequency The set frequency is valid for all activated input channels The return value is corresponding to the relation between the frequency of the chosen conversion source by the SourceClk and the call up parameter ConvFreq It is not allowed to directly call up the function SetConvClock Instead all settings regarding the timing of the data conversion should be carried out by the OperationMode function void SetIdle int Idle SetIdle sets the number of idle cycles between two sample packets of the A D converter The delivered value is corresponding with the number of read channels minus one plus the number of idle cycles The length of an idle cycle is determined by the set sampling rate of the SetConvClock functi
38. t During the continous mode the AD4 612 board is started by a single call of the Start function During the single shot mode every measurement cycle has to be approved by a further request of the function Start During the master mode the conversion starts immediately during the slave mode it starts with the next impulse to the TRIG_I O port The impulse to start the slave mode should not be longer than a sample in order to avoid muliple triggering PauseLength shows the number of idle cycles betweeen two bursts The length of the pause is an even integer of SampleF req NrOfSamples specifies the number of samples in a burst The distance between two samples is determined by the Samp1eF req parameter The delivered value is corresponding with the actual number of samples minus one NrOfChannels shows the number of sampled channels per sample The valid range is between one and eight The drafts on the following page summarize the relation of the different time parameters micro line AD4 612 user s guide Page 34 Start Of Conversion Start Of Conversion Start Of Conversion 1 sample samplefreq rd channel 1 ch channel n di annel 2 channel l channel 2 channeln nrofchannels ple nrofsamples 1 2 sample 3 sample channel 2 channeln channel 1 nrofpause samplefreq micro line
39. tated channel in the E7PROM of the AD4 612 board The return value is corresponding with the actually stored offset rate double SaveCutOffFreq int channel double value SaveCutOffFreq permanently stores the corner frequency of the input filter for a channel pair in the micro line AD4 612 user s guide Page 21 E2PROM of the AD4 612 board The return value is corresponding with the actually stored corner frequency double RecallGain int Channel RecallGain reads the amplification value of the stated channel from the E PROM of the AD4 612 board double RecallOffset intChannel RecallOffset reads the offset value of the stated channel from the EPROM of the AD4 612 board double RecallCutOffFreq int Channel RecallCutOffFreq reads the corner frequency of a channel from the E PROM of the AD4 612 board long Recall Version void Recall Version reads the version of the parameter set included in the E7 PROM of the AD4 612 board long SaveVersion long version SaveVersion stores the delivered version number of the parameter set included in the EPROM of the AD4 612 board The version number is cut to a length of 16 bits int SaveSCFRatio int Ratio SaveSCFRatio permanently stores the valid relation between the clock frequency and the corner frequency of the filter module in the AD4 612 board s E7PROM The setting is carried out by the manufacturer during the first operation and should not be changed The valid range
40. to 80 C Operation 0 C to 70 C Extendend temperature range available on request 15 Ambient Humidity Storage with up to 90 humidity not thawing Operation with 85 humidity not thawing micro line AD4 90 612 user s guide 17 78 Page 38
41. to enable external expansions All E7PROM module accesses are supported by the supplied C software drivers Direct hardware accesses from the application software are not allowed The E2PROM technology does not allow an unlimited number of write accesses therefore too many write accesses to the E PROM module should be avoided The used module is specified for a maximum of 100 000 00 write accesses otherwise the module could be destroyed This limitation only applies to write accesses and not to read accesses micro line AD4 612 user s guide Page 13 4 Register Description 4 1 Timer The timers of the MBSC are supported by the supplied C software drivers and should not be directly accessed via the application software The description of the respective software drivers can be found on pages 18 ff 4 2 Registers The initializing parameters necessary for the AD4 612 board operation have to be entered into the respective registers via software The base address of the AD4 612 board is determined by one of the chip select input signals CS1 bis CS7 of the micro line bus The CSx signal is produced by the connected processor module and can be chosen by placing the respective solder bridge on the AD4 612 board The additional address ports A0 to A5 are used for a further decoding of the AD4 612 board s single registers Register description base address name read write offset 0 3 82C54 clock generator data sheet 82C54 read and write
42. unt int NrOfChan double Limit AdCalib balances the offset voltage of the AD4 612 board s input amplifiers to zero volt Here a SampleCount about the values is made for each channel NofChan has to correspond with the adjusted number of channels in the OperationMode The calibration ends if the offset for all channels is smaller then Limit The Limit value is stated in V 1 LSB of the A D converter corresponds to 1 2mV The largest offset value of all channels will be returned The calibration should only be done with open without an Input Signal or short circuit analog inputs AdCalib uses the stored values of the global variables Gain Offset and CutoffFreq The results of the calibration are stored in Offset In order to balance a certain amplification and corner frequency the global Variables Gain and CutOffFreq are set to the requested value for each channel and called up by the AdCalib void CalibAndSave long SampleCount int NrOfChan double Limit CalibAndSave balances the offsets of all channels and permanently stores the values with the OfflineBoardCalibration functions in the EPROM of the AD4 612 board Here CalibAndSave uses the global variables Offset Gain and CutOffFreq The call up parameters are the same as for the AdCalib function CalibAndSave is used to determine the operation parameters of the AD4 612 board for a certain application void OfflineBoardCalibratio
43. ve place J6 chip select 5 CS5 active place J7 chip select 6 CS6 active place J8 chip select 7 CS7 active In the delivery state J2 is closed CS1 is activated micro line AD4 612 user s guide Page 32 8 Test Measuring Access Points The signals of the AD4 612 board s four analog channels can be measured as shown below The test measuring access points are located behind the programmable amplifiers and behind the offset contact element andare respectively corresponding with the signals for the A D converter There is a further test measuring access point for the A D conversion The test measuring access points can be distinguished by the pewtered contacts A D conversion channel 2 channel 0 channel 3 channel 1 0008080000080 0600 ee00000 ef c o e LSK g Cum G SH at CU e E Be BOS ROE ROE wm git SR 108 508 la nama Gr pais BOE ma m mE scence sl KR wl Hess em RO mali BOR CR SCH le UU de S i Li e H0e0e0e0000000000000000000000C00606060 P 0e0e0e000000000000000000000000606060 a micro line AD4 612 user s guide Page 33 9 Example for MBSC Programming The following is to exemplify the programming of the MBSC with the help of the driver function OperationMode Here the calling parameters are used which were also translated with the example program on the disc int OperationMode int NrOfChannels 8 int NrOfSamples 2 int PauseLength 4 int Mod
44. ve higher corner frequencies gt 50kHz 200 or 100 kHzon channel 1 100kHz on channel 2 to4 An alternative tothe Bessel low pass filters are the various Butterworth low pass filters with higher order but transient disadvantageous behavior micro line AD4 612 user s guide Page 4 1 5 Multiplexer The AD4 612 board is equipped with an 8 channel multiplexer which classifies the timing of the active channel to the appropriate analog part The processing of the multiplexer is completely taken over by theMBSC Multiple Burstmode Sampling Controller and does not need to be performed by the application software Channels to4 are active inputs the additional channels 5 to8 are locally connected test inputs with the following classification 1 25V for channel 5 2 5V for channel 6 and OV for channels 7 and 8 16 A D Converter The AD7892 is used as analog digital converter Ithas a 12 bit resolution and operates with a sampling rate of up to 500kHz version A or up to 600kHz version B 1 7 FIFO Buffer The AD4 612 board is equipped with a 512 sample wide FIFO buffer to improve the burst behavior and the interrupt capacity between the A D converter and the connected processor The interrupt triggering is programmable via software and can optionally be set to one sample or to 256 samples This option optimises a minimum system reaction time or a minimum interrupt capacity 1 8 Phase Optimized Sampling POS With POS Phase Optimized S
45. y The read results of this register reveal the status of the I2C_SDA port D 3 2 CLK SRC MUX Clock source multiplexer Here the input conversion for the 82C54 is selected These bits are not defined during a read After a reset the status is 00 which means 0MHz 00 internal OMHz 01 external timer clock 0 TCLK0 10 external timer clock 1 TCLK1 711 not defined 4 2 6 Control Register 3 address offset 16 write only D31 D2 DI DO x x x x x x x x x x x x x x x x x x x x x x x x x x x x x X not used DO MASTER SLAVE Here the mode is adjusted 1 switches the AD4 612 board into the master mode 0 switches the AD4 612 board into the slave mode After a reset the AD4 612 board is in the slave mode DI SINGLE SHOT The AD4 612 board triggers a single shot trigger 1 puts the AD4 612 board in the single shot mode 0 puts the AD4 612 board in the continuous mode After a reset the AD4 612 board is in the continuous mode D2 START 1 starts the AD4 612 board 0 stops the AD4 612 board After a reset this bit is set to zero micro line AD4 612 user s guide Page 17 5 Software The AD4 612 software includes functions to initialize the board components to measure or permanently store the parameters The software supports all board components and should mandatorily be used for hardware control Direct hardware
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