AK09918C数据手册(AKM-AK09918C).pdf-资料库

[AK09918] AK09918 3-axis Electronic Compass 1. General Description AK09918 is 3-axis electronic compass IC with high sensitive Hall sensor technology. Small package of AK09918 incorporates magnetic sensors for detecting terrestrial magnetism in the X-axis, Y-axis, and Z-axis, a sensor driving circuit, signal amplifier chain, and an arithmetic circuit for processing the signal from each sensor. Self-test function is also incorporated. From its compact foot print and thin package feature, it is suitable for map heading up purpose in Smart phone to realize pedestrian navigation function. 2. Features  Functions:  3-axis magnetometer device suitable for compass application  Built-in A to D Converter for magnetometer data out  16-bit data out for each 3-axis magnetic component  Sensitivity: 0.15 µT/LSB (typ.)  Serial interface  I2C bus interface Standard and Fast modes compliant with Philips I2C specification Ver.2.1  Operation mode  Power-down, Single measurement, Continuous measurement and Self-test  DRDY function for measurement data ready  Magnetic sensor overflow monitor function  Built-in oscillator for internal clock source  Power on Reset circuit  Self-test function with internal magnetic source  Built-in magnetic sensitivity adjustment circuit  Operating temperatures:  -30˚C to +85˚C  Operating supply voltage:   Current consumption:  Power-down:  Measurement: +1.65V to +1.95V 1 µA (typ.)  Average current consumption at 100 Hz repetition rate: 1.1mA (typ.)  Package:  AK09918C 4-pin WL-CSP (BGA): 0.8 mm  0.8 mm  0.5mm 016014242-E-00 2016/11 - 1 -

[AK09918] 3. Table of Contents 9.4.1. 9.4.2. 9.4.3. 9.4.4. 10.1.1. 10.1.2. 10.1.3. 1. General Description .................................................................................................................. 1 2. Features ..................................................................................................................................... 1 3. Table of Contents ...................................................................................................................... 2 4. Block Diagram and Functions ................................................................................................... 3 5. Pin Configurations and Functions ............................................................................................. 4 6. Absolute Maximum Ratings ...................................................................................................... 4 7. Recommended Operating Conditions ....................................................................................... 4 8. Electrical Characteristics ........................................................................................................... 5 8.1. DC Characteristics .............................................................................................................. 5 8.2. AC Characteristics .............................................................................................................. 6 8.3. Analog Circuit Characteristics ............................................................................................ 6 8.4. I2C Bus Interface ................................................................................................................ 7 9. Function Descriptions ............................................................................................................... 8 9.1. Power States ....................................................................................................................... 8 9.2. Reset Functions .................................................................................................................. 8 9.3. Operation Modes ................................................................................................................ 9 9.4. Description of Each Operation Mode ............................................................................... 10 Power-down Mode .................................................................................................... 10 Single Measurement Mode ........................................................................................ 10 Continuous Measurement Mode 1, 2, 3 and 4 ........................................................... 11 Self-test Mode............................................................................................................ 15 10. Serial Interface ...................................................................................................................... 16 10.1. I2C Bus Interface ............................................................................................................ 16 Data Transfer ........................................................................................................... 16 WRITE Instruction .................................................................................................. 18 READ Instruction .................................................................................................... 19 11. Registers ................................................................................................................................ 20 11.1. Description of Registers ................................................................................................. 20 11.2. Register Map .................................................................................................................. 21 11.3. Detailed Description of Register .................................................................................... 22 WIA: Who I Am ...................................................................................................... 22 RSV: Reserved register ............................................................................................ 22 ST1: Status 1 ............................................................................................................ 22 HXL to HZH: Measurement data ............................................................................ 23 TMPS: Dummy register ........................................................................................... 23 ST2: Status 2 ............................................................................................................ 24 CNTL1: Dummy register ......................................................................................... 24 CNTL2: Control 2 .................................................................................................... 24 CNTL3: Control 3 .................................................................................................... 25 TS1, TS2: Test register........................................................................................... 25 12. Example of Recommended External Connection ................................................................. 26 13. Package ................................................................................................................................. 27 13.1. Marking .......................................................................................................................... 27 13.2. Pin Assignment ............................................................................................................... 27 13.3. Outline Dimensions ........................................................................................................ 28 13.4. Recommended Foot Print Pattern ................................................................................... 28 14. Relationship between the Magnetic Field and Output Code ................................................. 29 IMPORTANT NOTICE .............................................................................................................. 30 11.3.1. 11.3.2. 11.3.3. 11.3.4. 11.3.5. 11.3.6. 11.3.7. 11.3.8. 11.3.9. 11.3.10. 016014242-E-00 2016/11 - 2 -

[AK09918] 4. Block Diagram and Functions Block 3-axis Hall sensor MUX Chopper SW HE-Drive Pre-AMP Integrator & ADC OSC POR VREF Interface Logic & Register Timing Control Magnetic Source Function Monolithic Hall elements. Multiplexer for selecting Hall elements. Performs chopping. Magnetic sensor drive circuit. Fixed-gain differential amplifier used to amplify the magnetic sensor signal. Integrates and amplifies Pre-AMP output and performs analog-to-digital conversion. Generates an operating clock for sensor measurement. Power On Reset circuit. Generates reset signal on rising edge of VDD. Generates reference voltage and current. Exchanges data with an external CPU. I2C bus interface using two pins, namely, SCL and SDA. Standard and Fast modes are supported. Generates a timing signal required for internal operation from a clock generated by the OSC. Generates magnetic field for Self-test of magnetic sensor. 016014242-E-00 2016/11 - 3 - 3-axis Hall sensor MUX SDA Chopper SW HE-Drive Pre- AMP Integrator＆ADC Interface Logic & Register SCL VDD VREF Timing Control OSC Magnetic source VSS POR

[AK09918] 5. Pin Configurations and Functions Pin No. Pin name I/O Type Function A1 A2 B1 B2 VSS SCL VDD - I - - CMOS Power SDA I/O CMOS Ground pin. Control data clock input pin. Input: Schmidt trigger Positive power supply pin. Control data input/output pin. Input: Schmidt trigger, Output: Open-drain 6. Absolute Maximum Ratings Vss = 0V Parameter Symbol Power supply voltage Input voltage (except for power supply pin) Input current (except for power supply pin) Storage temperature Vdd VIN IIN Tst Min. -0.3 -0.3 - -40 Max. +2.5 +2.5 ±10 +125 Unit V V mA ˚C If the device is used in conditions exceeding these values, the device may be destroyed. Normal operations are not guaranteed in such exceeding conditions. 7. Recommended Operating Conditions Vss = 0V Parameter Symbol Operating temperature Power supply voltage Ta Vdd Min. -30 1.65 Typ. Max. Unit 1.8 +85 1.95 ˚C V 016014242-E-00 2016/11 - 4 -

[AK09918] 8. Electrical Characteristics The following conditions apply unless otherwise noted: Vdd = 1.65V to 1.95V, Temperature range = -30˚C to +85˚C. 8.1. DC Characteristics Condition Min. Typ. Max. Unit 1 1.5 2.5 30%Vdd V V +10 µA V 20%Vdd V 3 3 4 µA mA mA Parameter Symbol High level input voltage VIH Low level input voltage VIL Input current IIN Hysteresis input voltage VHS (Note 1) Low level output voltage VOL (Note 2) Pin SCL SDA SCL SDA SCL SDA SCL SDA SDA 70%Vdd -0.3 VIN = Vss or Vdd -10 10%Vdd IOL ≤ +3mA Current consumption IDD1 VDD Power-down mode (Note 3) IDD2 IDD3 Vdd = 1.95V When magnetic sensor is driven Self-test mode (Note 1) Schmitt trigger input (reference value for design) (Note 2) Output is Open-drain. Connect a pull-up resistor externally. Maximum capacitive load: 400pF (Capacitive load of each bus line for I2C bus interface). (Note 3) Without any resistance load. It does not include the current consumed by external loads (pull-down resister, etc.). SDA = SCL = Vdd or 0V. 016014242-E-00 2016/11 - 5 -

[AK09918] 8.2. AC Characteristics Parameter Symbol Pin Condition Min. Typ. Max. Unit Power supply rise time PSUP VDD Period of time that VDD changes (Note 4) POR completion time PORT (Note 4) from 0.2V to Vdd. Period of time after PSUP to Power-down mode (Note 5) Power supply turn off SDV VDD Turn off voltage to enable POR to voltage (Note 4) Power supply turn on PSINT VDD interval (Note 4) restart (Note 5) Period of time that voltage lower than SDV needed to be kept to enable POR to restart (Note 5) Wait time before mode Twait 100 100 50 100 0.2 ms µs V µs µs setting (Note 4) Reference value for design. (Note 5) When POR circuit detects the rise of VDD voltage, it resets internal circuits and initializes the registers. After reset, AK09918 transits to Power-down mode. Power-down mode Power-down mode PORT VDD SDV 0V PSUP PSINT 8.3. Analog Circuit Characteristics Parameter Symbol Condition Min. Typ. Max. Unit Measurement data output bit Time for measurement Magnetic sensor sensitivity Magnetic sensor measurement range (Note 6) DBIT TSM BSE BRG - Single measurement mode 16 7.2 - 8.2 bit ms Ta = 25 ˚C Ta = 25 ˚C 0.1425 ±4670 0.15 ±4912 0.1575 µT/LSB ±5160 µT Magnetic sensor initial offset BIO Ta = 25 ˚C -2000 +2000 LSB (Note 7) (Note 6) Reference value for design (Note 7) Value of measurement data register on shipment test without applying magnetic field on purpose. 016014242-E-00 2016/11 - 6 -

[AK09918] 8.4. I2C Bus Interface I2C bus interface is compliant with Standard mode and Fast mode. Standard/Fast mode is selected automatically by fSCL.  Standard mode Parameter Min. Typ. 4.0 4.7 4.0 4.7 0 250 4.0 4.7 0.6 1.3 0.6 0.6 0 100 0.6 1.3 Max. 100 1.0 0.3 Max. 400 0.3 0.3 50 VIH VIL Unit kHz s s s s s s s ns s s Unit kHz s s s s s s s ns s s ns Parameter Min. Typ. fSCL ≤ 100kHz Symbol fSCL tHIGH tLOW tR tF tHD:STA tSU:STA SCL clock frequency SCL clock “High” time SCL clock “Low” time SDA and SCL rise time SDA and SCL fall time Start Condition hold time Start Condition setup time tHD:DAT SDA hold time (vs. SCL falling edge) tSU:DAT tSU:STO tBUF SDA setup time (vs. SCL rising edge) Stop Condition setup time Bus free time  Fast mode 100kHz ≤ fSCL ≤ 400kHz Symbol fSCL tHIGH tLOW tR tF tHD:STA tSU:STA SCL clock frequency SCL clock “High” time SCL clock “Low” time SDA and SCL rise time SDA and SCL fall time Start Condition hold time Start Condition setup time tHD:DAT SDA hold time (vs. SCL falling edge) tSU:DAT tSU:STO tBUF tSP SDA setup time (vs. SCL rising edge) Stop Condition setup time Bus free time Noise suppression pulse width [I2C bus interface timing] SCL 1/fSCL 016014242-E-00 2016/11 - 7 - tHIGH SCL SDA VIH tLOW tBUF tHD:STA tR tF tHD:DAT tSU:DAT tSU:STA Stop Start Start Stop tSU:STO VIL VIH VIL tSP

[AK09918] 9. Function Descriptions 9.1. Power States When VDD is turned on from Vdd = OFF (0V), all registers in AK09918 are initialized by POR circuit and AK09918 transits to Power-down mode. State 1 2 VDD OFF (0V) 1.65V to 1.95V Table 9.1. Power state Power state OFF It doesn’t affect external interface. ON 9.2. Reset Functions Power on Reset (POR) works until Vdd reaches to the operation effective voltage (about 1.1V: reference value for design) on power-on sequence. After POR is completed, all registers are initialized and AK09918 transits to Power-down mode. When Vdd = 1.65 to 1.95V, POR circuit is active. AK09918 has two types of reset; (1) Power on Reset (POR) When Vdd rise is detected, POR circuit operates, and AK09918 is reset. (2) Soft reset AK09918 is reset by setting SRST bit. When AK09918 is reset, all registers are initialized and AK09918 transits to Power-down mode. 016014242-E-00 2016/11 - 8 -

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AK09918C数据手册(AKM-AK09918C).pdf

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