User Guide
Contents
1. 1 SS pin is set LOW This enables communication with the master device RST pin is set HIGH then LOW This will reset the MaglC 3 A command word is clocked into the MicroMaglC on the SI pin Once 32 bits have clocked in the MicroMaglC will execute the command take a measurement 4 A measurement consists of forward biasing the sensor and making a period count then reverse biasing the sensor and counting again and then taking the difference between the two directions 5 Atthe end of the measurement the RDY line is set HIGH indicating data is ready The data is clocked out on the SO pin with the next 20 clock cycles OOO000000000000 UU HB B 400 883 3391 http www sensorexpert com cn RT o e SCK 81 P9 m8 e 1 JO c Mol 18 H7 1 Jo SI MSB 30 29 1 LD5B8 32 bit command word SO gt MSB 18 7 1 LSB 20 bit data value SO is LOW after 20 SCKs RY Figure 7 1 SPI Interface Sequence SS u SI SO FE a a t gt 100ns tsas gt 100ns cpol 0 Figure 7 2 SPI Interface Timing 7 1 1 Slave Select Keeping the SS line LOW dedicates the master device to the MicroMaglC If the user has no other slave devices the SS line can be permanently gr2. 6 Figure 4 3 Linearity vs Temperature rerrnrnnnnnnnnnvvvnnnnnnnnnnnnnnvnnnennnnenrrnnnnnnnnnnnenevnnn 7 Figure 4 4 Repeatability and Hysteresis rrrrnnnrrrrnnnnnnnnnnnrrnnnnrnnnnnnnnrrennnnnrrrrnnnnnnennn 7 Figure 5 1 MicroMaglC Mechanical Drawing Top View seseeeeeeees 8 Figure 5 1 MicroMaglC Mechanical Drawing Side View ssssssssse 9 Figure 6 1 MicroMaglC Orientation ooa qood pro EE the Hae e eec been itus a bts E b tudus 10 Figure 6 2 Default Strap Configuration rrrnrvennnnrnnrennnnnnnnnnnnnnnnnvnnernnnennnnnnnanennnnne 13 Figure 6 3 Strapping Configuration for Clock Source sssseesses 14 Figure 6 4 Strapping Configuration for Clock Output eeeeseeeeees 15 Figure 6 5 Strapping Configuration for Clock Speed ssessesssss 15 Figure 7 1 SPI Interface Sequence rrrnnnnnnrarvnnnnnnnnvnnnnnnnnnennennnnnnnnnannnnvnnnnnnanennnnne 17 Figure 7 2 SPI niueNEgPuM m serine theta att eocatean tie 17 List of Tables Table 3 1 Absolute Maximum Ratings 2 ceeeeciceeeececee enne nnne nnne 5 Table 3 2 Module Characteristics cccccsscsesssesssesescsescsescsescscsssssestesscsssceseseeees 5 Table 6 1 Board Connection Pin Out errnnnnvennnnnnnnvnnnnnnnnvnnnrnnnennnnnnanennnnnnrnnenennnnnne 11 Table 6 2 IA pc T 13 Table 7 1 Command Reg
3. Field Measurement Range 1100 1100 uT Sensor Frequency 165 kHz Gain PS 512 68 count uT Continuous Current PS 32 1 7 mA rms measured at MaglC ASIC Voc PS 1024 36 mA rms Idle current measured at MagIC ASIC Vec 55 uA rms Recommended DC Power Supply Voltage 27 3 3 3 6 VDC VDD Operating Temperature 40 485 C Storage Temperature 40 85 C Notes 1 Power supply voltage VDD 3 3 VDC PS is the period select which is set by the user in software and is inversely proportional to the data rate as show in Figure 4 1 2 The Gain and Resolution can be increased by a factor of 8 by setting the period select to 4095 However the ASIC counter can overflow if the field is strong enough to drive the count beyond a signed 20 bit signed integer In practical magnetometer applications a sensor gain calibration is optimally performed when the sensor module is in the host system Also noise can limit attainable resolution 3 Field Measurement Range is defined as the monotonic region of the output characteristic curve 4 Sensor frequency is defined within free the Earth s magnetic field O0O000000000000 DB B BB B B 400 883 3391 http www sensorexpert com cn 4 Typical Operating Characteristics 60000 50000 512 40000 30000 20000 OUTPUT COUNTS PS Data Rate Samples Sec 10000 1000 100 HHH 100 1000 Period Select 10000 Figure 4 1 Period Select vs Data R
4. User Manual MicroMagICT 3 Axis High Data Rate Magnetic Sensor Module INT SENSOR CORPORATION Table of Contents 1 COPYRIGHT amp WARRANTY INFORMATION erneuern nnn nnnm nnn 3 2 OVERVIEW 2 4 3 SPEGIFIGATIONS Lesere senare 5 4 TYPICAL OPERATING CHARACTERISTICS unnnnnnnnnannnnnannnnnnnnnnnnnnnnnennnnnnnnnnunnnnnennnnnnnn 6 5 MECHANICAL DRAWING nuuvnnnnvnnnnnnnnnnnnnnnnnnnnunnnnnnnnnnnnnnnnnnnennrnnnnnnnnnnnnnnnnnnnnnnnnnennnnnnnnnnn 8 6 SET UP rm 10 6 1 PCB ORIENTATION AND OUTPUT POLARITIES esee 10 6 2 BOARD CONNECTIONS AND TEST POINTS seem 11 6 3 CLOCK OPTIONSGS sse nenhennn nnne nthter ases sena sisi ss sad ss san unne 13 7 OPERA TION oovccci vce secceioidt deauedecucanchnudezcceosddaswadeunecidcnstnasdeedceensdnatednuaenaveucheateseacseateanusan 16 7 1 MAKING AMEASUREMENT evuuuvvvvvrannnnnenenvnrvsvannnnnenenvvrrnnnnnenenvevrnnnnnneneneere 16 7 1 1 Slave Select m mrrrrrrmuvvrvrrarrrrrerervvrrsvsnnrarervervvrnnnsnnesenverrnnsnnenenverrnnnn 17 7 1 2 Idle Mode ee aaa aa aae E R N 18 7 1 3 SPl Interface Considerations eeeessseene 18 7 2 REGISTER DEFINITION eene nnne nennen 19 List of Figures Figure 4 1 Period Select vs Data Rate per Axis rrrannnnnrnnnnanannvnnnrnnnvnnnnvrnrnnnnenrnnn 6 Figure 4 2 Output Counts vs Magnetic Field and Temperature
5. Divide clock source by 2 Figure 6 5 Strapping Configuration for Clock Speed OO0O000000000000 NO 0000 400 883 3391 http www sensorexpert com cn 7 Operation Data flow to and from the MicroMaglC is through a hardware handshaking synchronous serial interface that adheres to the SPI bus protocol Section 6 2 reviews the various interface lines and provides brief descriptions of their functions The user may wish to refer to the MagIC User Manual for a more detailed discussion on the underlying operation of the MaglC driver ASIC although this is not necessary The MaglC ASIC interface is based on PNI s 11096 ASIC interface except the command is changed from 8 bit to 32 bit The new command word contains similar sensor axis select bits together with startup and period preset values The measured result is now extended to signed 20bit value compared to 16 bit in the PNI s 11096 ASIC 7 1 Making a Measurement The steps to make a sensor measurement are given below and the sequence and timing are given in Figure 7 1 and Figure 7 2 In general the user sends a command word see Section 7 2 to the MicroMaglC through the SPI port specifying the sensor to be measured After dividing by the Period Select PS value the MicroMaglC returns the result of a complete forward reverse measurement of the sensor in a 20 bit 2 s complement format range 524288 to 524287 Note that only one sensor can be measured at a time
6. down NED coordinate system That is the positive terminals for the X Y and Z axis sensors point in the NED directions respectively when the arrow printed on the board is pointing north and the board is lying flat and level The resulting polarity of the output data is such that when the direction arrow on the board is facing north the X axis value will be positive when the board is pointing west Y axis positive terminal is pointing north the Y axis value will be positive and when the board is sitting level the Z axis which is pointing down will be positive in the northern hemisphere and negative in the southern hemisphere Magnetometer Polarities Earth s Magnetic North pole this way Polarity of MaglC data output relative to position of board reference arrow to magnetic North X Y view of PCB Orientation of sensors is N E D North East Down for X Y Z sensors positive leads as they relate to the MaglC pin nomenclature Positive terminal of component is denoted with a dot o Source uMaglC Orientation vsd Figure 6 1 MicroMaglC Orientation OOO000000000000 UU HB B 400 883 3391 http www sensorexpert com cn 6 2 Board Connections and Test Points The MicroMaglC PCB contains three connectors J7 J8 and J9 as identified on the underside of the PCB Connector pins are labeled on top of the board as can be seen in Figure 5 1 The pin out is summarized in Table 6 1 with descriptions following
7. not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages so the above limitations or exclusions may not apply to you This warranty gives you specific legal rights and you may have other rights that vary by state or province OO0O000000000000 EH D E B B D 400 883 3391 http www sensorexpert com cn 2 Overview Thank you for purchasing PNI Sensor Corporation s MicroMaglC PNI part number 12800 The MicroMaglC is an integrated 3 axis high data rate magnetic field sensing module combining PNI s patented SmartSens magneto inductive MI sensors with PNI s MaglC high data rate driver ASIC Designed primarily to aid in the evaluation and prototyping of PNI s SmartSens technology the MicroMaglC board contains connectors test points option solder jumpers and extra support circuits to expedite evaluation The microprocessor compatible SPI interface allows easy access to the MicroMaglC s measurement parameters and resulting field measurement data PNI s MicroMaglC benefits include low power consumption large signal noise immunity under all conditions a large dynamic range and high sampling rates Measurements are very stable over temperature and inherently free from offset drift Also the MicroMaglC features software configurable resolution sample rate and field measurement range These advantages make PNI s MicroMaglC not only the choice for prototyping high volume Smart
8. It is critical a jumper be in place for S1 S2 and S3 such that no input is left floating Pull up pull down resistors were not incorporated into the MicroMaglC so current consumption can more accurately reflect a user s final design assuming the MicroMagIC is being used for prototyping work in a user s system O0O000000000000 DB B BB B B 400 883 3391 http www sensorexpert com cn Clock Source Required strapping Internal Clock dD RST T E PD GND IT z ON zi c20 s j cos pui J p ME i r 138 BIH Position of choice see Figure 6 4 and Figure 6 5 External Clock Crystal Clock Default position Clock Inp it D e o LTETTTTTTTTTTTIT TD o 3 c Position of choice see Figure 6 4 and Figure 6 5 RST LS E zie GND Bass E ONC CLKOUT CLKSEL Position of choice see Figure 6 5 Figure 6 3 Strapping Configuration for Clock Source O0000000000000 NO 0000 400 883 3391 http www sensorexpert com cn Clock Output Strapping Option Clock output enabled Monitor on XO test pad Default position c20 oh T SI Dis BEN CLKOUT Output clock signal disabled Not possible when clock is crystal oscillator 1x0 Le C20 m z im Dis Bg BEN CLKOUT Figure 6 4 Strapping Configuration for Clock Output Clock Speed Strapping Options Default position
9. Sens solutions but also for lower volume applications that require a complete solution PNI s SmartSens product line also includes the Sen XYTM and Sen Z magneto inductive sensors MaglC and 11096 ASICs MS2100 single chip solution and the MicroMag2 and MicroMag3 The primary difference between the MicroMagIC with MaglC ASIC and MicroMag2 3 with 11096 ASIC is the data rate at which the module can operate the MaglC can provide about 8x the data rate for comparable resolution The user may wish to refer to PNI s MagIC ASIC User Manual for more detailed information on the MagIC operation and underlying functionality OOO000000000000 UU HB B 400 883 3391 http www sensorexpert com cn 3 Specifications Table 3 1 Absolute Maximum Ratings Parameter Symbol Maximum DC Supply Voltage VDD 3 75 VDC Digital Input Voltage Vin 0 3V to 3 6V CAUTION Stresses beyond those listed Table 3 1 may cause permanent damage to the device These are stress ratings only Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied Exposure to absolute maximum rating conditions for extended periods may affect device reliability Table 3 2 Module Characteristics Parameter Min Typ Max Units Resolution 1 Gain PS 512 0 015 uT Linearity best fit straight line over 300 uT 0 6 1 96
10. ate per Axis 500 1000 MAGNETIC FIELD pT 1500 2000 Figure 4 2 Output Counts vs Magnetic Field and Temperature OO0O000000000000 NO 0000 400 883 3391 http www sensorexpert com cn 24000 20000 L ri s L 4 16000 gt 212000 o 5 E Rp 8000 2 o L 4000 0 0 50 100 150 200 250 300 MAGNETIC FI ELD pT Figure 4 3 Linearity vs Temperature 50000 Ist Cycle 40000 8 2nd Cycle a 3rd Cycle N 30000 4th Cycle in e 5th Cycle li dj 20000 A p 10000 5 o 9 2000 1500 1000 500 f 500 1000 1500 2000 10000 p E E 20000 o 30000 40000 50000 MAGNETIC FIELD pT Figure 4 4 Repeatability and Hysteresis log OOOOOOOO DH D E B B D 400 883 3391 http www sensorexpert com cn 5 Mechanical Drawing 2 5 0 10 typical Dimensions in mm inches ID Denotes header pins Square is pin 1 Figure 5 1 MicroMagIC Mechanical Drawing Top View OO0O000000000000 EH D E B B D 400 883 3391 http www sensorexpert com cn 15 8 0 625 H Figure 5 2 MicroMaglC Mechanical Drawing Side View AA A 9 6 0 375 00000000000000 Hl Dl B U D 400 883 3391 http www sensorexpert com cn 6 Set Up 6 1 PCB Orientation and Output Polarities The magneto inductive sensors on the MicroMaglC PCB are arranged in the north east
11. es exist and were not caused by accident misuse neglect alteration repair improper installation or improper testing If a Product is defective transportation charges for the return of the Product to Customer within the United States and Canada will be paid by PNI For all other locations the warranty excludes all costs of shipping customs clearance and other related charges PNI will have a reasonable time to make repairs or to replace the Product or to credit Customer s account PNI warrants any such repaired or replacement Product to be free from defects in material and workmanship on the same terms as the Product originally purchased Except for the breach of warranty remedies set forth herein or for personal injury PNI shall have no liability for any indirect or speculative damages including but not limited to consequential incidental punitive and special damages relating to the use of or inability to use this Product whether arising out of contract negligence tort or under any warranty theory or for infringement of any other party s intellectual property rights irrespective of whether PNI had advance notice of the possibility of any such damages including but not limited to loss of use revenue or profit In no event shall PNI s total liability for all claims regarding a Product exceed the price paid for the Product PNI neither assumes nor authorizes any person to assume for it any other liabilities Some states and provinces do
12. g edge of SCK and remain valid for 100 ns after the edge New data may be presented to the SI pin on the falling edge of SCK The SI line is referred to in the MaglC manual as the MOSI Master Out Slave In line which is the common SPI term RDY Data Ready It is recommended the RDY line be used to ensure data is clocked out of the MicroMagIC only when it is available RDY is set low after a RESET After a command has been received and the data is ready RDY will be changed to high The RDY line is referred to in the MaglC manual as DRDY RST Reset RST must be toggled from low high low before sending a measurement command RST is usually low The RST line is referred to as the RESET line in the MaglC manual PD Power Down This signal has a pull up resistor tied to VDD When pulled to ground it will turn off the core voltage regulator of the MagIC device Note this is only a MicroMaglC feature and not a MaglC signal SS SPI Slave Select This signal sets the MicroMaglC as the operating slave device on the SPI bus The SS line must be LOW prior to data transfer in either direction and must stay LOW during the entire transfer The SPI bus can be freed up SS line set HIGH for communication with another slave device while the MicroMaglC is taking a measurement or idle but after all communication between the MicroMagIC and master device is finished VDD 3 3 VDC Input The user should supply 3 3 VDC on this line The bias resistor
13. he higher the precision OO0O000000000000 DB B BB B B 400 883 3391 http www sensorexpert com cn Table 7 2 Results Register Description Returns measured sensor value in a 20 bit signed value with ranges from 2 to 2 1 2 s complement number Zero s will be returned on SO if more than 20 clock cycles are sent during a read Measured Sensor Value O0O000000000000 000000 E mail support sinocomopto com Tel 400 883 3391 Web www sinocomopto com Web www sensorexpert com cn OD OD 1 D O00000000000 00000000000026 O0000000000000 O0O00000000000 00000000 HA 401 00000000 7050 681 000000 qj 1003 O D 1004 0 o 0 86 0755 83439588 DU 0 0 86 021 52527755 O D D 86 010 62672430 0 O 0 852 24208555 0 O0 0 86 0755 83433488 O O 0 86 021 52522211 O 0 0 86 010 62672433 0 D 0 852 24200055
14. ister sessssssseesessseeeee eee en nnne 19 Table 7 2 Results Register eM E 20 OO0O000000000000 EH D E B B D 400 883 3391 http www sensorexpert com cn 1 Copyright amp Warranty Information O Copyright PNI Sensor Corporation 2009 All Rights Reserved Reproduction adaptation or translation without prior written permission is prohibited except as allowed under copyright laws Revised April 2009 for the most recent version visit our website at www pnicorp com PNI Sensor Corporation 133 Aviation Blvd Suite 101 Santa Rosa CA 95403 USA Tel 707 566 2260 Fax 707 566 2261 Warranty and Limitation of Liability PNI Sensor Corporation PNI manufactures its Products from parts and components that are new or equivalent to new in performance PNI warrants that each Product to be delivered hereunder if properly used will for one year following the date of shipment unless a different warranty time period for such Product is specified i in PNI s Price List in effect at time of order acceptance or ii on PNI s web site www pnicorp com at time of order acceptance be free from defects in material and workmanship and will operate in accordance with PNI s published specifications and documentation for the Product in effect at time of order PNI will make no changes to the specifications or manufacturing processes that affect form fit or function of the Product without written
15. notice to the Customer however PNI may at any time without such notice make minor changes to specifications or manufacturing processes that do not affect the form fit or function of the Product This warranty will be void if the Products serial number or other identification marks have been defaced damaged or removed This warranty does not cover wear and tear due to normal use or damage to the Product as the result of improper usage neglect of care alteration accident or unauthorized repair THE ABOVE WARRANTY IS IN LIEU OF ANY OTHER WARRANTY WHETHER EXPRESS IMPLIED OR STATUTORY INCLUDING BUT NOT LIMITED TO ANY WARRANTY OF MERCHANTABILITY FITNESS FOR ANY PARTICULAR PURPOSE OR ANY WARRANTY OTHERWISE ARISING OUT OF ANY PROPOSAL SPECIFICATION OR SAMPLE PNI NEITHER ASSUMES NOR AUTHORIZES ANY PERSON TO ASSUME FOR IT ANY OTHER LIABILITY If any Product furnished hereunder fails to conform to the above warranty Customer s sole and exclusive remedy and PNI s sole and exclusive liability will be at PNI s option to repair replace or credit Customer s account with an amount equal to the price paid for any such Product which fails during the applicable warranty period provided that i Customer promptly notifies PNI in writing that such Product is defective and furnishes an explanation of the deficiency ii such Product is returned to PNI s service facility at Customer s risk and expense and iii PNI is satisfied that claimed deficienci
16. ounded Conversely if the user has multiple slave devices then the SPI bus can be freed up for other devices by bringing the SS line HIGH The SS line can be brought HIGH either e after sending the command word on the SI line but before setting the RDY line HIGH in order to receive the measurement data on the SO line and or OO0O000000000000 EH D E B B D 400 883 3391 http www sensorexpert com cn e after receiving the measurement data on the SO line but before initiating another measurement sequence 7 1 2 Idle Mode The MicroMagIC incorporates an idle mode to reduce power consumption in which it automatically goes to sleep when it is not exchanging data or taking a measurement However it does not necessarily initialize in the idle mode at power up To ensure the MicroMaglC will be in idle mode after being turned on it is necessary to cycle the MagIC through one measurement operation 7 1 3 SPI Interface Considerations When implementing an SPI port whether a dedicated hardware peripheral port or a software implemented port using general purpose I O also known as Bit Banging the timing parameters given in Figure 7 2 must be met to ensure reliable communications The clock set up and hold times fogs and tpasy must be greater than 100 ns Also note that an SPI port can be implemented using different clock polarity options The clock polarity used with the MicroMaglC must be normally low cpol 0 Data always is con
17. sidered valid while SCK is high fpask Time Data After SCLK High When SCK is low data is in transition fpssy Time Data Before SCLK High O0OO00000000000 DB B BB B B 400 883 3391 http www sensorexpert com cn 7 2 Register Definition Bit 31 24 Name Command Table 7 1 Command Register Description Command register Initiates a sensor measurement Bits are named as follows 31 30 29 28 27 26 25 24 ODIR MOT ASI ASO ODIR Oscillator Direction Determines the magnetic oscillator direction if MOT is set to HIGH If MOT is set LOW ODIR has no effect Used for debug only MOT Magnetic Oscillator Test When set HIGH causes the sensor oscillator selected by ASO and AS1 in the direction selected by ODIR to run continuously until the RST pin is set HIGH ASO0 AS1 Axis Select Determines sensor to be measured Function AS1 ASO X 0 0 X 0 1 Y 1 0 Z 1 1 23 16 Startup Counter Preset Value 5 bit unsigned Startup Counter Preset Value Bits 21 to 23 are ignored Default OxOF Configures how many clock oscillations to count before starting the forward or backward measurement 15 0 Period Select Value 12 bit unsigned Period Select Value Bits 12 to 15 are ignored Configures how many clock oscillations to count during a forward or backward measurement The higher the number the slower the data rate and t
18. the table Note the MicroMagIC is configured to run as a slave device in a master slave configuration Table 6 1 Board Connection Pin Out Mid Eu cipes Desa oe J7 SCK SCLK SPI Serial Clock Input SO MISO SPI Serial Out SI MOSI SPI Serial In J8 RDY DRDY Data Ready RST RESET Reset GND Ground J9 NC No connection PD NA Power Down SL No connection ESS SSNOT SPI Slave Select Input VDD VCCIO 3 3V Power input NC No connection GND Ground SCK SPI Serial Clock Input An SPI input is used to synchronize both the data in and out through the SO and SI lines SCK is generated by the customer supplied master device and should be 1 MHz or less One byte of data is exchanged over eight clock cycles The SCK line is referred to in the MaglC manual as the SCLK line which is the common SPI term SO SPI Serial Out An SPI output that sends data from the MicroMaglC to the master device Data is transferred most significant bit first and is captured by the master device on the rising edge of SCK The SO line is referred to in the MaglC manual as the MISO Master In Slave Out line which is the common SPI term OO0O000000000000 NO 0000 400 883 3391 http www sensorexpert com cn SI SPI Serial In An SPI input that provides data from the master device to the MicroMaglC Data is transferred most significant bit first Data must be presented at least 100 ns before the risin
19. values for the three magnetometers were optimized for 3 3 VDC operation The board can be run at other voltages within the specifications of the MagIC Refer to the test sheet for optimal bias resistor values for other operating voltages The MicroMaglC PCB incorporates a couple of test points which are identified on the top of the PCB and summarized in Table 6 2 See Figure 6 2 for the locations of XI and XO 000 0 D EL D D 400 883 3391 http www sensorexpert com cn OOOOOOOOOOO O Table 6 2 Test Points Board Identifier Description External Clock input signal Clock signal output for monitoring or daisy chain internal or external clock Ground XO 6 3 Clock Options The MicroMaglC can be configured for various clock options including type of clock internal external or crystal oscillator outputting or not outputting the clock and dividing the clock rate by 2 In its default configuration the MicroMaglC will operate using a crystal oscillator clock mounted on the MicroMaglC board at full speed and the signal will be output Changes to the clock options are made by altering the solder jumpers on pins S1 S6 Figure 6 2shows the default configuration while other clock configurations are shown in Figure 6 3 Figure 6 4 and Figure 6 5 924 RST mn B z PD 6ND pass E ONC zi RBE EN NT cla 0 2 CLKOUT CLKSEL CLKDIV Figure 6 2 Default Strap Configuration
Download Pdf Manuals
Related Search