AK09970N

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[AK09970N] 017006194-E-00 2017/5 -1- 1. Genaral Description AK09970N is a 3D magnetic sensor IC with high sensitivity and wide measurement range utilizing our latest Hall sensor technology. Our ultra-small package of AK09970N incorporates magnetic sensors, chopper stabilized signal, amplifier chain, and all necessary interface logic for detecting weak to strong magnetic fields in the X, Y and Z planes independently. From its compact foot print, thin package, and extremely low power consumption, it is suitable for a wide range of applications such as connected home, door & window opening/close sensing, and magnetic tamper detection of IoT systems or smart meters just to name a few. 2. Features ‹ Functions: ¾ 16 bit data out for each 3-axis magnetic component ¾ Programmable threshold 3-axis magnetometer ¾ Built-in A to D Converter for magnetometer data output ¾ Selectable sensor measurement range and sensitivity setting — High sensitivity setting z Sensitivity: 1.1 μT/LSB (typ.) z Measurement range: ± 36 mT — Wide range setting z Sensitivity: 3.1 μT/LSB (typ.) z Measurement range: X and Y-axis Æ ±34.9mT, Z-axis Æ ±101.5mT ¾ Serial interface — I2C bus interface Standard and Fast mode compliant with Philips I2C specification Ver.2.1 — 4-wire SPI ¾ Operation mode — Power-down, Single measurement, Continuous measurement ¾ 3-axis programmable switch function ¾ Output pin for event notification — INT pin and OD-INT pin ¾ DRDY function for measurement data ready ¾ Magnetic sensor overflow monitor function ¾ Built-in oscillator for internal clock source ¾ Selectable sensor drive — Low power drive / Low noise drive ‹ Operating temperatures: ¾ - 4 Û&WRÛ& ‹ Operating supply voltage: ¾ +1.7V to +3.6V ‹ Current consumption (VDD = +1.8V, +2Û&): ¾ Power-down: 2.0 nA (typ.) ¾ Measurement: — Average current consumption at 1 Hz/10Hz repetition rate z Low power drive: 1.0 μA(typ.)@1HzODR, 3.5 μA(typ.)@10HzODR z Low noise drive: 2.0 μA(typ.) @1HzODR, 12.0 μA(typ.)@10HzODR ‹ Package ¾ AK09970N 16-pin QFN package: 3.0mm x 3.0mm x 0.75mm 3D Magnetic Sensor with Programmable Switch AK09970N

[AK09970N] 017006194-E-00 2017/5 -2- 3. Table of Contents

[AK09970N] 017006194-E-00 2017/5 -3- 12.3.6. CNTL2[7:0]: Operation Mode, Sensor Drive, Measurement Range and Sensitivity setting 12.3.7. BOP1,2 and BRP1,2 registers: Operating Threshold and Returning Threshold Setting of

[AK09970N] 017006194-E-00 2017/5 -4- 4. Block Diagram and Functions 4.1. Block Diagram 3-axis Hall sensor SDA/SI INT Chopper SW MUX Pre- AMP ADC Interface, Logic Register SCL/SK VDD VREF Timing Control Signal Processing CAD SO OSC1 CSB Analog Regulator VSS RSTN OSC2 OD-INT 4.2. Functions Block Function 3-axis Hall sensor Monolithic Hall elements. Chopper SW MUX Multiplexer for selecting Hall elements. Analog Regulator Internal power supply. PREAMP Differential amplifier used to amplify the magnetic sensor signal. ADC Convert analog output to digital output. OSC1 Generates an operating clock for sensor measurement. OSC2 Generates an operating periodic clock for sequencer. VREF Generates temperature independent reference voltage. Interface Logic Register Exchanges data with an external CPU. INT and OD-INT pin indicates State1 or/and State2 (selectable). State1: Sensor measurement has ended and data is ready to be read. State2: Measurement magnetic data exceeds setting switch threshold value. I2C bus interface using two pins (SCL and SDA). Standard and Fast modes are supported. 4-wire SPI is also supported by SK, SI, SO and CSB pins. Timing Control Signal Processing Generates a timing signal required for internal operation. Magnetic sensitivity adjustment and switch calculation for switch function.

[AK09970N] 017006194-E-00 2017/5 -5- 5. Pin Configurations and Functions Pin No. Pin name I/O Type Function

1 INT O CMOS Interrupt pin

“H” active. Refer to section 10.6.

2 CSB I CMOS Chip select pin for 4-wire SPI

“L” active. Connect to VDD when selecting I2C bus interface.

3 SCL I CMOS When the I2C bus interface is selected (CSB pin is

connected to VDD). SCL: Control clock input pin Input: Schmitt trigger SK When the 4-wire SPI is selected. SK: Serial clock input pin 4 N/C - - Non-connect. Keep this pin non-connected.

5 SDA I/O CMOS When the I2C bus interface is selected (CSB pin is

connected to VDD). SDA: Control data input/output pin Input: Schmitt trigger, Output: Open-drain SI I When the 4-wire SPI is selected. SI: Serial data input pin

6 SO O CMOS When the I2C bus interface is selected (CSB pin is

connected to VDD) Hi-Z output. Keep this pin electrically non-connected. When the 4-wire SPI is selected. Serial data output pin 7 N/C - - Non-connect. Keep this pin non-connected. 8 N/C - - Non-connect. Keep this pin non-connected. 9 N/C - - Non-connect. Keep this pin non-connected. 10 N/C - - Non-connect. Keep this pin non-connected.

11 OD-INT O Open

͆L” active. Refer to section 10.6.

12 CAD I CMOS When the I2C bus interface is selected (CSB pin is

connected to VDD). CAD: Slave address input pin Connect to VSS or VDD. When the 4-wire serial interface is selected. Connect to VSS.

13 VSS - Power Ground pin

14 N/C - - Non-connect. Keep this pin non-connected.

15 VDD - Power Positive power supply pin

16 RSTN I CMOS Reset pin

Resets registers by setting to “L”.

[AK09970N] 017006194-E-00 2017/5 -6- 6. Absolute Maximum Ratings VSS=0V Parameter Symbol Min. Max. Unit Power supply voltage V+ -0.3 +4.3 V Input voltage VIN -0.3 (V+)+0.3 V Input current IIN -10 +10 mA Storage temperature Tstg -40 +125 Û& Note: 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 Remark Symbol Min. Typ. Max. Unit Operating temperature - Ta -40 - +85 Û& Power supply voltage VDD pin voltage Vdd 1.7 1.8 3.6 V

[AK09970N] 017006194-E-00 2017/5 -7- 8. Electrical Characteristics The following conditions apply unless otherwise noted: Vdd = 1.7V to 3.6V, Temperature range = -4Û&WRÛ& Typical condition: Vdd = 1.8 V, Temperature = 25 Û& 8.1. DC Characteristics Parameter Symbol Pin Condition Min. Typ. Max. Unit High level input voltage VIH CSB RSTN SCL/SK SDA/SI CAD -7 0 % V d d -- V Low level input voltage VIL - - - 30%Vdd V Input current IIN VIN =V s s o r V d d -10 +10 μA Hysteresis input voltage*1 VHS CSB RSTN SCL/SK SDA/SI 9GG•9 5%Vdd - - V Vdd<2V 10%Vdd High level output voltage*2 VOH SO INT Low level output voltage 1*2 VOL1 SO INT Low level output voltage 2*3 VOL2 SDA/SI OD-INT ,2/”P$ VdG•9 -- 0 . 4 V ,2/”P$ Vdd<2V - - 20%Vdd V Current consumption*4 IDD1 VDD Power-down mode - 2.0 2000 nA IDD2 When magnetic sensor is driven - 1.5 2.2 mA IDD3 All Power-down (RSTN pin = L) - 2.0 2000 nA Notes: * 1. Schmitt trigger input (reference value for design). * 2. IOH: High level output current. IOL: Low level output current. * 3. Output is open-drain. Connect to a pull-up resistor externally. * 4. Without any resistance load. 8.2. AC Characteristics of RSTN Parameter Symbol Pin Condition Min. Typ. Max. Unit Wait time for reset twRST RSTN Vdd > 80%Vdd 5 - - μs Reset input effective pulse width tRSTL RSTN Vdd > 80%Vdd 5 - - μs Reset input ineffective pulse width tSPRST RSTN - - - 1 μs Figure 8.1 Reset condition

[AK09970N] 017006194-E-00 2017/5 -8- 8.3. AC Characteristics of INT and OD-INT Parameter Symbol Pin Condition Min. Typ. Max. Unit Fall time of OD-INT TfOD OD-INT CL = 50 pF RL NŸ W\\S - - 250 ns Fall time of INT TfINT INT CL = 50 pF - - 250 ns Rise time of INT TrINT INT CL = 50 pF - - 250 ns Figure 8.2 Output load circuit of OD-INT (recommended circuit) [Rise time and fall time] TfOD OD-INT 90%Vdd 10%Vdd TrINT INT 90%Vdd 10%Vdd TfINT

[AK09970N] 017006194-E-00 2017/5 -9- 8.4. Overall Characteristics Table 8.1 High sensitivity setting Parameter Symbol Condition Min. Typ. Max. Unit Measurement data output bit DBIT - - 16 - Bit Time for measurement TSM SDR bit = “0” (Low noise drive) - 0.792 0.872 ms SDR bit = “1” (Low power drive) - 0.23 0.253 Magnetic sensor sensitivity BSE 7D Û&, SMR bit = “0” 0.99 1.1 1.21 μT/LSB Magnetic sensor measurement range BRG 7D Û&, SMR bit = “0” s32.44 s36.04 s39.64 mT Magnetic sensor initial offset*5 BOF 7D Û&, X and Y-axis -614 - +614 LSB 7D Û& Z-axis -868 - +868 Noise*6 NIS SDR bit = “0” (Low noise drive) -5 . 0- μTrms SDR bit = ”1” (Low power drive) - 15.0 - Table 8.2 Wide range setting Parameter Symbol Condition Min. Typ. Max. Unit Measurement data output bit DBIT - - 16 - Bit Time for measurement TSM SDR bit = “0” (Low noise drive) - 0.792 0.872 ms SDR bit = “1” (Low power drive) - 0.23 0.253 Magnetic sensor sensitivity BSE 7D Û&, SMR bit = “1” 2.79 3.1 3.41 μT/LSB Magnetic sensor measurement range BRG 7D Û&, X and Y-axis, SMR bit = “1” s31.42 s34.91 s38.4 mT 7D Û&, Z-axis, SMR bit = “1” s91.42 s101.57 s111.73 Magnetic sensor initial offset*5 BOF 7D Û&, X and Y-axis -218 - +218 LSB 7D Û& Z-axis -308 - +308 Noise*6 NIS SDR bit = “0” (Low noise drive) -6 . 0 - μTrms SDR bit = “1” (Low power drive) 18.0 Note: * 5. Value of measurement data register on shipment test without applying magnetic field on purpose. * 6. Reference value for design. Under steady magnetic field.

[AK09970N] 017006194-E-00 2017/5 -1 1- 8.6. I2C Bus Interface CSB pin = “H” I2C bus interface is compliant with Standard mode and Fast mode. Standard/Fast is selected automatically by fSCL. „ Standard mode I6&/”N+] Symbol Parameter Min. Typ. Max. Unit fSCL SCL clock frequency - - 100 kHz tHIGH SCL clock “High” time 4.0 - - μs tLOW SCL clock “Low” time 4.7 - - μs tR SDA and SCL rise time - - 1.0 μs tF SDA and SCL fall time - - 0.3 μs tHD:STA Start Condition hold time 4.0 - - μs tSU:STA Start Condition setup time 4.7 - - μs tHD:DAT SDA hold time (vs. SCL falling edge) 0-- μs tSU:DAT SDA setup time (vs. SCL rising edge) 250 - - ns tSU:STO Stop Condition setup time 4.0 - - μs tBUF Bus free time 4.7 - - μs „ Fast mode 100kHz< I6&/”N+] Symbol Parameter Min. Typ. Max. Unit fSCL SCL clock frequency - - 400 kHz tHIGH SCL clock “High” time 0.6 - - μs tLOW SCL clock “Low” time 1.3 - - μs tR SDA and SCL rise time - - 0.3 μs tF SDA and SCL fall time - - 0.3 μs tHD:STA Start Condition hold time 0.6 - - μs tSU:STA Start Condition setup time 0.6 - - μs tHD:DAT SDA hold time (vs. SCL falling edge) 0 - - μs tSU:DAT SDA setup time (vs. SCL rising edge) 100 - - ns tSU:STO Stop Condition setup time 0.6 - - μs tBUF Bus free time 1.3 - - μs tSP Noise suppression pulse width - - 50 ns 1/fSCL SCL VIH VIL tHIGH SCL SDA VIH tLOWtBUF tHD:STA tR tF tHD:DAT tSU:DAT tSU:STA Stop Start Start Stop tSU:STO VIL VIH VIL tSP Figure 8.5 I2C bus interface timing

[AK09970N] 017006194-E-00 2017/5 -1 2- 9. Status Description 9.1. State Transition Diagram Reset* Power-down mode RSTN pin = 䇾H䇿 Stopped state 䞉Interrupt output setting 䞉Operation mode setting 䞉Sensor drive setting 䞉Measurement range and sensitivity setting 䞉Switch threshold setting (If it䇻s necessary) Wrote to MODE[3:0] bits =䇿0000䇿 (Power-down mode) Wrote to MODE[3:0] = 䇾0001䇿 (Single measurement mode) Write to operation mode setting registers (Access to 21h address) Continuous measurement mode Power up RSTN pin =䇿L䇿 ERRADC bit,ERRXY bit,SW bits,HX,HY and HZ registers are stopped updating**ERRADC bit,ERRXY bit,SW bits,HX,HY and HZ registers are stopped updating Operation state Magnetic field measurement/ Switch judgment/ Updating measurement data Transit to other state automatically Transit to other state automatically Transition condition Transition condition Transition condition (Access to 20h-27h Address) Transition condition (Access to 20h-27h Address) *Aftff er reset is completed, all registers are initialized and AK09970 transits to Power-down mode automatically. *After reset is completed, all registers are initialized and AK09970 transits to Power-down mode automatically. 㻼㼛㼣㼑㼞㻌㼡㼜㻌 㼟㼑㼝㼡㼑㼚㼏㼑 Figure 9.1 State transition diagram

[AK09970N] 017006194-E-00 2017/5 -1 3- 9.2. Power States AK09970N does not have built in power on reset circuit. Reset has to be done manually by user. When RSTN pin is applied a specified voltage (VIL), all registers in AK09970N are initialized. Table 9.1 Power States State VDD Power state 1 OFF (0V) OFF (0V). It doesn’t affect external interface. Digital input pins other than SCL, SDA and OD-INT pin should be fixed to “L” (0V). 2 1.7V to 3.6V ON After reset (RSTN pin = “L”), AK09970N can measure magnetic field. Refer to 8.2. 9.3. Register States Refer to Figure 9.1. State DRDYbit /DOR bit Switch register*9 Measurement data register*1 0 Other register Reset 0 Default value Default value Default value Power-down mode Refer to 10.3 Default value or previous result Default value or previous measurement value Setting value Stopped state DRDY: 0 DOR: previous measurement value Default value or previous result Default value or previous measurement value Setting value Operation state: (Magnetic field measurement) Refer to 10.3 Default value or previous result Default value or previous measurement value Setting value Operation state: (Switch judgment and updating measurement data) Refer to 10.3 Default value or previous result Previous measurement value Setting value Note: * 9.SW bits (SWX1 bit,SWX2 bit,SWY1 bit,SWY2 bit,SWZ1 bit,SWZ2 bit) , ERRDAC bit and ERRXY bit * 10.HX, HY and HZ registers 9.4. Pin States Refer to Figure 9.1 State INT pin SDA/SI pin SO pin OD-INT pin RSTN pin Other pins Reset L Hi-Z Hi-Z Hi-Z L Don’t care Power-down mode Previous result Serial interface Serial interface Previous result HD o n ’ t c a r e Stopped state LS e r i a l interface Serial interface Hi-Z H Don’t care Operation state: (Magnetic field measurement) Previous result Serial interface Serial interface Previous result HD o n ’ t c a r e Operation state: (Switch judgment and updating measurement data) Previous result Serial interface Serial interface Previous result HD o n ’ t c a r e

[AK09970N] 017006194-E-00 2017/5 -1 4- 10. Functional Descriptions 10.1. Reset Functions When AK09970N changes to reset status, it consumes the current of reset state (IDD3). AK09970N has two types of reset; I. Reset pin (RSTN) AK09970N is reset by Reset pin. II. Soft reset AK09970N is reset by setting SRST bit. After reset is completed, all registers are initialized and AK0970 transits to Power-down mode automatically. 10.2. Operation modes AK09970N has following nine operation modes: (1) Power-down mode (MODE[3:0] bits = ”0000”) (2) Single measurement mode (MODE[3:0] bits = ”0001”) ¾ Sensor is measured for one time and data is output. Transits to Power-down mode automatically after measurement ended. (3) Continuous measurement mode 1 (MODE[3:0] bits = ”0010”) ¾ Sensor is measured periodically in 0.25 Hz. Transits to other operation mode by writing MODE[3:0] bits directly. (4) Continuous measurement mode 2 (MODE[3:0] bits = ”0100”) ¾ Sensor is measured periodically in 0.5 Hz. Transits to other operation mode by writing MODE[3:0] bits directly. (5) Continuous measurement mode 3 (MODE[3:0] bits = ”0110”) ¾ Sensor is measured periodically in 1 Hz. Transits to other operation mode by writing MODE[3:0] bits directly. (6) Continuous measurement mode 4 (MODE[3:0] bits = ”1000”) ¾ Sensor is measured periodically in 10 Hz. Transits to other operation mode by writing MODE[3:0] bits directly. (7) Continuous measurement mode 5 (MODE[3:0] bits = ”1010”) ¾ Sensor is measured periodically in 20 Hz. Transits to other operation mode by writing MODE[3:0] bits directly. (8) Continuous measurement mode 6 (MODE[3:0] bits = ”1100”) ¾ Sensor is measured periodically in 50 Hz. Transits to other operation mode by writing MODE[3:0] bits directly. (9) Continuous measurement mode 7 (MODE[3:0] bits = ”1110”) ¾ Sensor is measured periodically in 100 Hz. Transits to other operation mode by writing MODE[3:0] bits directly. By setting CNTL2 registers MODE[3:0] bits, the operation set for each mode is started. When power is turned ON and reset action, AK09970N is in Power-down mode. When a specified value is set to MODE[3:0] bits, AK09970N transits to the specified mode and starts operation. Refer to Figure 9.1. 10.2.1. Description of Each Operation Mode 10.2.1.1. Power-down Mode Power to almost all internal circuits is turned off, all registers are accessible in Power-down mode and data stored in read/write registers still remains. They can be reset by soft reset function.

[AK09970N] 017006194-E-00 2017/5 -1 5- 10.2.1.2. Single Measurement Mode When Single measurement mode (MODE[3:0] bits = “0001”) is set, magnetic sensor measurement is started. After magnetic sensor measurement and signal processing is finished, measurement magnetic data is stored to measurement data registers (HX, HY and HZ registers), then AK09970N transits to Power-down mode automatically. On transition to Power-down mode, MODE[3:0] bits turns to “0000”. At the same time, DRDY bit in ST register turns to “1” and SW bits in ST register turns to another state 10.2.1.3. Continuous Measurement Mode 1,2,3,4,5,6 and 7 When Continuous measurement modes (1 to 7) are set, magnetic sensor measurement is started periodically at 0.25 Hz, 0.5 Hz, 1 Hz, 10 Hz, 20 Hz, 50 Hz and 100Hz respectively. After magnetic sensor measurement and signal processing is finished, measurement magnetic data is stored to measurement data registers and all circuits except for the minimum circuit required for counting cycle length are turned off (Power Save: PS). When the next measurement timing comes, AK09970N wakes up automatically from PS and starts measurement again. Continuous measurement mode ends when a different operation mode is set or threshold value is reset. It repeats measurement until other operation mode is set or threshold value is reset. When user access to Setting Registers (address 20h to 27h), AK09970N stops updating switch states and measurement data registers. After CNTL2 register (address 21h) is set again, a new measurement starts. ST register (without DRDY bit and DOR bit) and measurement data registers will not be initialized by this. Refer to 9.1, 9.3 and 9.4. Table 10.1 Continuous measurement modes Operation mode Register setting (MODE[3:0] bits) Measurement frequency [Hz] Continuous measurement mode 1 0010 0.25 Continuous measurement mode 2 0100 0.5 Continuous measurement mode 3 0110 1 Continuous measurement mode 4 1000 10 Continuous measurement mode 5 1010 20 Continuous measurement mode 6 1100 50 Continuous measurement mode 7 1110 100 (N-1)th Nth (N+1)th PS Measurement PS Measurement PS 0.25Hz,0.5Hz,1Hz,10Hz,20Hz,50Hz or 100Hz Figure 10.1 Continuous measurement modes

[AK09970N] 017006194-E-00 2017/5 -1 8- (N-1)th Nth (N+1)th (N+2)th PS Measurement PS Measur ement PS Measurement PS Measurement Data Register (N-1)th Nth (N+1)th (N+2)th Data register is protected because data is being read DRDY Keep DRDY bit ="1" DOR Data read Addr. ST,Data(N) Addr. ST,Data(N+1) Figure 10.6 Data Not Skip: When data read has not been finished before the next measurement end 10.3.4. End Operation Set Power-down mode (MODE[3:0] bits = “0000”) to end Continuous measurement mode. 10.4. Programmable Switch Function AK09970N has a programmable switch function created by setting switch threshold values (operating threshold*1 1 and returning threshold*1 2), switch function enable. When measurement magnetic data exceed the operating threshold value, switch event bit (SW bits*1 3) turns to “1”. When measurement magnetic data is lower than the returning threshold, SW bits turns to “0”. The switch function is used to check the magnitude relation between the measurement data and the switch threshold values. After the magnetic sensor measurement and signal processing has finished, measurement data is stored to the measurement data register. Then the AK09970N compares the measurement data with the defined switch threshold values and outputs the comparison result at the SW bits in ST register. Switch thresholds can be free to set (Settable range: same as measurement range. Settable sensitivity: same as measurement sensitivity). Refer to Table 10.2 and Figure 10.7. Note: * 11. BOPX1[15:0], BOPX2[15:0], BOPY1[15:0], BOPY2[15:0], BOPZ1[15:0] and BOPZ2[15:0] * 12. BRPX1[15:0], BRPX2[15:0], BRPY1[15:0], BRPY2[15:0], BRPZ1[15:0] and BRPZ2[15:0] * 13. SWX1 bit, SWX2 bit, SWY1 bit, SWY2 bit, SWZ1 bit and SWZ2 bit

[AK09970N] 017006194-E-00 2017/5 -1 9- Table 10.2 Relation between threshold values and SWX1 bit*1 4 Relation between BOPX1 and BRPX1 Magnitude relation between measurement data and threshold values SWX1 bit result BOPX1 ” BRPX1 (Switch function disable) Don’t care Don’t care BOPX1 > BRPX1 (Switch function enable) BOPX1 < HX 1 BRPX1 > HX 0 Other relations Previous result BOPX1㻌BRPX1㻌-BRG㻌 Measurement data (HX) SWX1 bit = ”1”㻌 BRG㻌 SWX1 bit = ”0”㻌 Hysteresis㻌 Figure 10.7 Relation between threshold values and SWX1 bit*1 4 Note: * 14. SWX1 bit, SWY1 bit, SWZ1 bit, SWX2 bit, SWY2 bit and SWZ2 bit exhibits the same relationship 10.5. Error Notification Function 10.5.1. Magnetic Sensor Overflow AK09970N has a limitation for measurement range, where the absolute value of X-axis and Y-axis should be smaller than 36.04 mT (High sensitivity mode) or 34.91 mT (Wide range mode). When the magnetic field exceeds this limitation, AK09970N outputs limitation value at the X-axis or/and Y-axis (fixed value: 36.04 mT or 34.91 mT). This is called magnetic sensor overflow. When magnetic sensor overflow occurs, ERRXY bit turns to “1”. When the magnetic field less than limitation value, measurement data register (HX and HY) and ERRXY bit are updated. 10.5.2. ADC Overflow AK09970N has a limitation for ADC range, when the magnetic field exceeded this limitation, data stored at measurement data registers (HX, HY and HZ) are not correct. This is called ADC overflow. When ADC overflow occurs, ERRADC bit turns to “1”.When measurement data registers are updated, ERRADC bit is updated.

[AK09970N] 017006194-E-00 2017/5 -2 0- 10.6. Interrupt Function AK09970N has two interrupt pins, INT pin (CMOS) and OD-INT pin (Open-drain). When CNTL1 register is set and interrupt event (magnetic event) occurred, AK09970N outputs selected interrupt event at the INT pin or/and OD-INT pin. AK09970N can output four type of interrupt event (Data ready, Magnetic sensor overflow, ADC overflow and Switch event) to pins. INTEN bit and ODINTEN bit can select interrupt function be enabled or disabled. When set INTEN bit/ODINTEN bit =”1” and magnetic event occurs, INT pin turn to “H” and OD-INT pin turn to “L”. Operating Threshold㻌 Returning Threshold㻌 H㻌 L㻌 -BRG㻌 BRG㻌 Magnetic flux density 㻌 Interrupt㻌 Hysteresis㻌 Figure 10.8 Interrupt pin Table 10.3 Interrupt event and interrupt function Content of interrupt event Conditions of event INTEN bit ODINTEN bit INT pin output OD-INT pin output Data ready (Refer to 10.3) DRDYEN bit = ”1”, DRDY bit = ”1” 00L H 1L L 10H H 1H L Magnetic sensor Overflow (Refer to 10.5.1) ERRXYEN bit =”1”, ERRXY bit = “1” 00L H 1L L 10H H 1H L ADC overflow (Refer to 10.5.2) ERRADCEN bit =”1”, ERRADC bit = “1” 00L H 1L L 10H H 1H L Switch event (Refer to 10.4) SWEN bit*1 5 =”1”, SW bit*1 6 : 00L H 1L L 10H H 1H L - Other than those above condition Don’t care Don’t care LH Note: * 15. SWX1EN bit, SWY1EN bit, SWZ1EN bit, SWX2EN bit, SWY2EN bit and/or SWZ2EN bit * 16. SWX1 bit, SWX2 bit, SWY1 bit, SWY2 bit, SWZ1 bit and/or SWZ2 bit

[AK09970N] 017006194-E-00 2017/5 -2 2- 10.7. Sensor Drive Select Users can choose “Low power” or “Low noise” drive by the SDR bit. “Low power” is used to save the current consumption and “Low noise” is used to reduce the noise of the AK09970N. When Low noise (SDR bit = “0”) is set, output magnetic data noise is more reduced than Low power (about 70% of Low power). When Low power (SDR bit = “1”) is set, average current consumption at 10 Hz repetition rate is saved from 12.0 μA to 3.2 μA( V D D = 1 . 8 V ,Û&). Default SDR bit is Low noise enable (SDR bit = “0”). 10.8. Sensor Measurement Range and Sensitivity Select Users can choose “High sensitivity (Normal measurement range and high sensitivity)” or “Wide range (Wide measurement range and normal sensitivity)” setting. “High sensitivity” is used to measure with high magnetic sensitivity and “Wide range” is used to measure strong magnetic field (apply only to Z-axis). When High sensitivity (SMR bit = “0”) is set, magnetic sensor sensitivity is about three times higher than Wide range (3.1 μT/LSB Æ 1.1μT/LSB). When Wide range (SMR bit = “1”) is set, Z-axis measurement range isabout three times wider than High sensitivity (Z-axis measurement range:s36.04 mT Æ s101.57 mT). Default SMR bit is High sensitivity enable (SMR bit = “0”).

[AK09970N] 017006194-E-00 2017/5 -2 6- SCL FROM MASTER acknowledge DATA OUTPUT BY TRANSMITTER DATA OUTPUT BY RECEIVER 1 98 START CONDITION Clock pulse for acknowledge not acknowledge Figure 11.7 Generation of acknowledge 11.2.1.4. Slave Address The slave address of AK09970N can be selected from the following list by setting CAD0/1 pin. When CAD pin is fixed to VSS, the corresponding slave address bit is “0“. When CAD pin is fixed to VDD, the corresponding slave address bit is “1”. Table 11.1 Slave address and CAD pin CAD Slave Address

00 C h

10 D h

000110 C A D R / W

Figure 11.8 Slave address The first byte including a slave address is transmitted after a start condition, and an IC to be accessed is selected from the ICs on the bus according to the slave address. When a slave address is transferred, the IC whose device address matches the transferred slave address generates an acknowledge then executes an instruction. The 8th bit (least significant bit) of the first byte is a R/W bit. When the R/W bit is set to “1“, READ instruction is executed. When the R/W bit is set to “0“, WRITE instruction is executed. 11.2.2. WRITE Instruction When the R/W bit is set to “0”, AK09970N performs write operation. In write operation, AK09970N generates an acknowledge after receiving a start condition and the first byte (slave address) then receives the second byte. The second byte is used to specify the address of an internal control register and is based on the MSB-first configuration. MSB LSB A7 A6 A5 A4 A3 A2 A1 A0 Figure 11.9 Register address After receiving the second byte (register address), AK09970N generates an acknowledge then receives the third byte.

[AK09970N] 017006194-E-00 2017/5 -2 8- 11.2.3.2. Random Address Read By random address read operation, data at an arbitrary address can be read. The random address read operation requires to execute WRITE instruction as dummy before a slave address for the READ instruction (R/W bit = “1”) is transmitted. In random read operation, a start condition is first generated then a slave address for the WRITE instruction (R/W bit = “0”) and a read address are transmitted sequentially. After AK09970N generates an acknowledge in response to this address transmission, a start condition and a slave address for the READ instruction (R/W bit = “1”) are generated again. AK09970N generates an acknowledge in response to this slave address transmission. Next, AK09970N transfers the data at the specified address then increments the internal address counter by one. If the master IC generates a stop condition instead of an acknowledge after data is transferred, the read operation stops. SDA S T A R T A C K A C K S Slave Address A C K Register Address(n) Data(n) P S T O P Data(n+x) A C K Data(n+1) A C K R/W="0" S T A R T A C K S Slave Address R/W="1" Figure 11.13 Random address read

[AK09970N] 017006194-E-00 2017/5 -2 9- 12. Registers 12.1. Description of Registers AK09970N has registers of 29 addresses as indicated inTable 12.1. Every address consists of 1-byte to 8-byte data. Data is transferred to or received from the external CPU via the serial interface described previously. Table 12.1 Register Table Address READ/ WRITE Description Byte width Remarks 00H READ Company ID, Device ID 4 Device Information 10H Status 2 ST data 11H Status and Measurement Magnetic Data

4 ST + X-axis data

13H 6 ST + X and Y-axis data 14H 4 ST + Z-axis data 15H 6 ST + X and Z-axis data 16H 6 ST + Y and Z-axis data 17H 8 ST + X,Y and Z-axis data 18H Status and Measurement Magnetic Data (upper 8 bits of measurement data register)

2 ST data

1BH 4 ST + X and Y-axis data 1CH 3 ST + Z-axis data 1DH 4 ST + X and Z-axis data 1EH 4 ST + Y and Z-axis data 1FH 5 ST + X,Y and Z-axis data 20H READ/ WRITE Control 1 2 Interrupt function settings 21H Control 2 1 Operation Mode, Sensor Drive, Measurement Range and Sensitivity 22H Control 3 (Switch threshold value)

4 X-axis threshold 1 settings

23H 4 X-axis threshold 2 settings 24H 4 Y-axis threshold 1 settings 25H 4 Y-axis threshold 2 settings 26H 4 Z-axis threshold 1 settings 27H 4 Z-axis threshold 2 settings 30H Reset 1 Soft reset 31H I2C disable 1 40H Test 2 DO NOT ACCESS 41H 1 DO NTO ACCESS Addresses 20h to 27h are compliant with automatic increment function of serial interface respectively. When the address is in 20h to 27h, the address is incremented 20hÆ 21h Æ 22h Æ 23h ... Æ 27h, and the address goes back to 20h after 27h.

[AK09970N] 017006194-E-00 2017/5 -3 0- 12.2. Register Map Table 12.2 Register Map Addr. Byte0 Byte1 Byte2 Byte3 Byte4 Byte5 Byte6 Byte7 Read only register 00H WIA[15:8] WIA[7:0] RSV[15:8] RSV[7:0] - - - - 19H S T [ 1 5 : 8 ] S T [ 7 : 0 ] H X [ 1 5 : 8 ] ---- - 1AH S T [ 1 5 : 8 ] S T [ 7 : 0 ] H Y [ 1 5 : 8 ] ---- - 1CH S T [ 1 5 : 8 ] S T [ 7 : 0 ] H Z [ 1 5 : 8 ] ---- - Read/Write register 20H C N T L 1 [ 1 5 : 8 ] C N T L 1 [ 7 : 8 ] - ---- - 22H BOP1X[15:8] BOP1X[7:0] BRP1X[15:8] BRP1X[7:0] - - - - 23H BOP2X[15:8] BOP2X[7:0] BRP2X[15:8] BRP2X[7:0] - - - - 24H BOP1Y[15:8] BOP1Y[7:0] BRP1Y[15:8] BRP1Y[7:0] - - - - 25H BOP2Y[15:8] BOP2Y[7:0] BRP2Y[15:8] BRP2Y[7:0] - - - - 26H BOP1Z[15:8] BOP1Z[7:0] BRP1Z[15:8] BRP1Z[7:0] - - - - 27H BOP2Z[15:8] BOP2Z[7:0] BRP2Z[15:8] BRP2Z[7:0] - - - - 40H - - - ---- - 41H - - - ---- -

[AK09970N] 017006194-E-00 2017/5 -3 1- Table 12.3 Further details about Register Map (D[7:0]) Register name Bit number (D[7:0]) 76 5 4 3 2 1 0 WIA[7:0] 11 0 0 0 0 0 0 RSV[7:0] RSV7 RSV6 RSV5 RSV4 RSV3 RSV2 RSV1 RSV0 ST[7:0] ERRXY SWZ2 SWZ1 SWY2 SWY1 SWX2 SWX1 DRDY HX[7:0] HX7 HX6 HX5 HX4 HX3 HX2 HX1 HX0 HY[7:0] HY7 HY6 HY5 HY4 HY3 HY2 HY1 HY0 HZ[7:0] HZ7 HZ6 HZ5 HZ4 HZ3 HZ2 HZ1 HZ0 CNTL1[7:0] ERRXYEN SWZ2EN SWZ1EN SWY2EN SWY1EN SWX2EN SWX1EN DRDYEN CNTL2[7:0] 0 0 SMR SDR MODE3 MODE2 MODE1 MODE0 BOP1X[7:0] BOP1X7 BOP1X6 BOP1X5 BOP1X4 BOP1X3 BOP1X2 BOP1X1 BOP1X0 BRP1X[7:0] BRP1X7 BRP1X6 BRP1X5 BRP1X4 BRP1X3 BRP1X2 BRP1X1 BRP1X0 BOP2X[7:0] BOP2X7 BOP2X6 BOP2X5 BOP2X4 BOP2X3 BOP2X2 BOP2X1 BOP2X0 BRP2X[7:0] BRP2X7 BRP2X6 BRP2X5 BRP2X4 BRP2X3 BRP2X2 BRP2X1 BRP2X0 BOP1Y[7:0] BOP1Y7 BOP1Y6 BOP1Y5 BOP1Y4 BOP1Y3 BOP1Y2 BOP1Y1 BOP1Y0 BRP1Y[7:0] BRP1Y7 BRP1Y6 BRP1Y5 BRP1Y4 BRP1Y3 BRP1Y2 BRP1Y1 BRP1Y0 BOP2Y[7:0] BOP2Y7 BOP2Y6 BOP2Y5 BOP2Y4 BOP2Y3 BOP2Y2 BOP2Y1 BOP2Y0 BRP2Y[7:0] BRP2Y7 BRP2Y6 BRP2Y5 BRP2Y4 BRP2Y3 BRP2Y2 BRP2Y1 BRP2Y0 BOP1Z[7:0] BOP1Z7 BOP1Z6 BOP1Z5 BOP1Z4 BOP1Z3 BOP1Z2 BOP1Z1 BOP1Z0 BRP1Z[7:0] BRP1Z7 BRP1Z6 BRP1Z5 BRP1Z4 BRP1Z3 BRP1Z2 BRP1Z1 BRP1Z0 BOP2Z[7:0] BOP2Z7 BOP2Z6 BOP2Z5 BOP2Z4 BOP2Z3 BOP2Z2 BOP2Z1 BOP2Z0 BRP2Z[7:0] BRP2Z7 BRP2Z6 BRP2Z5 BRP2Z4 BRP2Z3 BRP2Z2 BRP2Z1 BRP2Z0 SRST[7:0] 00 0 0 0 0 0 S R S T I2CDIS[7:0] I2CDIS7 I2CDIS6 I2CDIS5 I2CDIS4 I2CDIS3 I2CDIS2 I2CDIS1 I2CDIS0 Table 12.4 Further details about Register Map (D[15:8]) Register name Bit number (D[15:8]) 15 14 13 12 11 10 9 8 WIA[15:8] 01 0 01 0 0 0 RSV[15:8] RSV15 RSV14 RSV13 RSV12 RSV11 RSV10 RSV9 RSV8 ST[15:8] 1 1 1 1 1 1 DOR ERRADC HX[15:8] HX15 HX14 HX13 HX12 HX11 HX10 HX9 HX8 HY[15:8] HY15 HY14 HY13 HY12 HY11 HY10 HY9 HY8 HZ[15:8] HZ15 HZ14 HZ13 HZ12 HZ11 HZ10 HZ9 HZ8 CNTL1[15:8] 0 0 0 0 0 ODINTEN INTEN ERRADCEN BOP1X[15:8] BOP1X15 BOP1X14 BOP1X13 BOP1X12 BOP1X11 BOP1X10 BOP1X9 BOP1X8 BRP1X[15:8] BRP1X15 BRP1X14 BRP1X13 BRP1X12 BRP1X11 BRP1X10 BRP1X9 BRP1X8 BOP2X[15:8] BOP2X15 BOP2X14 BOP2X13 BOP2X12 BOP2X11 BOP2X10 BOP2X9 BOP2X8 BRP2X[15:8] BRP2X15 BRP2X14 BRP2X13 BRP2X12 BRP2X11 BRP2X10 BRP2X9 BRP2X8 BOP1Y[15:8] BOP1Y15 BOP1Y14 BOP1Y13 BOP1Y12 BOP1Y11 BOP1Y10 BOP1Y9 BOP1Y8 BRP1Y[15:8] BRP1Y15 BRP1Y14 BRP1Y13 BRP1Y12 BRP1Y11 BRP1Y10 BRP1Y9 BRP1Y8 BOP2Y[15:8] BOP2Y15 BOP2Y14 BOP2Y13 BOP2Y12 BOP2Y11 BOP2Y10 BOP2Y9 BOP2Y8 BRP2Y[15:8] BRP2Y15 BRP2Y14 BRP2Y13 BRP2Y12 BRP2Y11 BRP2Y10 BRP2Y9 BRP2Y8 BOP1Z[15:8] BOP1Z15 BOP1Z14 BOP1Z13 BOP1Z12 BOP1Z11 BOP1Z10 BOP1Z9 BOP1Z8 BRP1Z[15:8] BRP1Z15 BRP1Z14 BRP1Z13 BRP1Z12 BRP1Z11 BRP1Z10 BRP1Z9 BRP1Z8 BOP2Z[15:8] BOP2Z15 BOP2Z14 BOP2Z13 BOP2Z12 BOP2Z11 BOP2Z10 BOP2Z9 BOP2Z8 BRP2Z[15:8] BRP2Z15 BRP2Z14 BRP2Z13 BRP2Z12 BRP2Z11 BRP2Z10 BRP2Z9 BRP2Z8 I2CDIS[15:8] I2CDIS15 I2CDIS14 I2CDIS13 I2CDIS12 I2CDIS11 I2CDIS10 I2CDIS9 I2CDIS8 When RSTN pin is applied VDD, all registers of AK09970N are initialized. TEST1 and TEST2 is test register for shipment test. Do not access this register.

[AK09970N] 017006194-E-00 2017/5 -3 2- 12.3. Detailed Description of Registers 12.3.1. WIA[15:0]: Company ID and Device ID Addr. Register name D7 D6 D5 D4 D3 D2 D1 D0 Read-only register 00h WIA[7:0] 1 1 0 0 0 0 0 0 Addr. Register name D15 D14 D13 D12 D11 D10 D9 D8 Read-only register 00h WIA[15:8] 0 1 0 0 1 0 0 0 WIA[7:0] bits: Device ID of AKM. It is described in one byte and fixed value. C0h: fixed WIA[15:8] bits: Company ID of AK09970N. It is described in one byte and fixed value. 48h: fixed 12.3.2. RSV[15:0]: Reserved Register Addr. Register name D7 D6 D5 D4 D3 D2 D1 D0 Read-only register 00h RSV[7:0] RSV7 RSV6 RSV5 RSV4 RSV3 RSV2 RSV1 RSV0 Addr. Register name D15 D14 D13 D12 D11 D10 D9 D8 Read-only register 00h RSV[15:8] RSV15 RSV14 RSV13 RSV12 RSV11 RSV10 RSV9 RSV8 RSV[7:0] bits/ RSV[15:8] bits: Reserved register for AKM. 12.3.3. ST[15:0]: Status Addr. Register name D7 D6 D5 D4 D3 D2 D1 D0 Read-only register 10h-1fh ST[7:0] ERRXY SWZ2 SWZ1 SWY2 SWY1 SWX2 SWX1 DRDY Reset 0 0 0 0 0 0 0 0 Addr. Register name D15 D14 D13 D12 D11 D10 D9 D8 Read-only register 10h-1fh ST[15:8] 1 1 1 1 1 1 DOR ERRADC Reset 1 1 1 1 1 1 0 0 DRDY bit: Data Ready “0”: Normal “1”: Data is ready DRDY bit turns to “1” when data is ready in Single measurement mode and Continuous measurement mode 1, 2, 3, 4, 5, 6, and 7. It returns to “0” when any one of measurement data register (HX,HY or/and HZ register) is read all the way through or access to Setting Registers (address 20h to 27h). DOR bit: Data Overrun “0”: Normal “1”: Data overrun

[AK09970N] 017006194-E-00 2017/5 -3 3- DOR bit turns to “1” when data has been skipped in Continuous measurement mode 1, 2, 3, 4, 5, 6 or 7. DOR bit turns to “0” at the after the next measurement ended. SWX1 bit, SWY1 bit, SWZ1 bit: Measurement data of X, Y and Z-axis exceed switch threshold 1 “0”: Measurement data of X, Y and Z-axis exceed returning threshold 1 “1”: Measurement data of X, Y and Z-axis exceed operating threshold 1 SWX2 bit, SWY2 bit, SWZ2 bit: Measurement data of X, Y and Z-axis exceed switch threshold 2 “0”: Measurement data of X, Y and Z-axis exceed returning threshold 2 “1”: Measurement data of X, Y and Z-axis exceed operating threshold 2 Refer to 10.4 for detailed information. ERRXY bit: Magnetic sensor overflow “0”: Normal “1”: Magnetic sensor overflow occurred (X and/or Y-axis) Refer to 10.5.1 for detailed information. ERRADC bit: ADC overflow “0”: Normal “1”: ADC overflow occurred and measurement data is not correct Refer to 10.5.2 for detailed information. 12.3.4. HX[15:0]/HY[15:0]/HZ[15:0]: Measurement Data Addr. Register name D7 D6 D5 D4 D3 D2 D1 D0 Read-only register 10h 1fh HX[7:0] HX7 HX6 HX5 HX4 HX3 HX2 HX1 HX0 HY[7:0] HY7 HY6 HY5 HY4 HY3 HY2 HY1 HY0 HZ[7:0] HZ7 HZ6 HZ5 HZ4 HZ3 HZ2 HZ1 HZ0 Reset 0 0 0 0 0 0 0 0 Addr. Register name D15 D14 D13 D12 D11 D10 D9 D8 Read-only register 10h 1fh HX[15:8] HX15 HX14 HX13 HX12 HX11 HX10 HX9 HX8 HY[15:8] HY15 HY14 HY13 HY12 HY11 HY10 HY9 HY8 HZ[15:8] HZ15 HZ14 HZ13 HZ12 HZ11 HZ10 HZ9 HZ8 Reset 0 0 0 0 0 0 0 0 Measurement data of magnetic sensor X-axis/Y-axis/Z-axis HX[7:0] bits: X-axis measurement data lower 8-bit HX[15:8] bits: X-axis measurement data higher 8-bit HY[7:0] bits: Y-axis measurement data lower 8-bit HY[15:8] bits: Y-axis measurement data higher 8-bit HZ[7:0] bits: Z-axis measurement data lower 8-bit HZ[15:8] bits: Z-axis measurement data higher 8-bit Measurement data is stored in two’s complement. Measurement range of each axis is -32768 to 32767 in 16-bit output (High sensitivity setting). Measurement range of X and Y-axis are -11264 to 11264 in 16-bit output, Z-axis is -32768 to 32767 in 16-bit output (Wide range setting).

[AK09970N] 017006194-E-00 2017/5 -3 4- Table 12.5 Measurement magnetic data format (High sensitivity setting) Measurement data (each axis) [15:0] bits Magnetic flux density [mT] ERRXY bitTwo’s complement Hex Decimal 0111 1111 1111 1111 7FFF 32767 >36.0437 1 0111 1111 1111 1111 7FFF 32767 36.0437 0 0000 0000 0000 0001 0001 1 0.0011 0 0000 0000 0000 0000 0000 0 0 0 1111 1111 1111 1111 FFFF -1 -0.0011 0 1000 0000 0000 0000 8000 -32768 -36.0448 0 1000 0000 0000 0000 8000 -32768 <-36.0448 1 Table 12.6 Measurement magnetic data format (Wide range setting, X and Y-axis) Measurement data (X and Y axis) [15:0] bits Magnetic flux density [mT] ERRXY bitTwo’s complement Hex Decimal 0010 1100 0000 0000 2C00 11264 >34.9184 1 0010 1100 0000 0000 2C00 11264 34.9184 0 0000 0000 0000 0001 0001 1 0.0031 0 0000 0000 0000 0000 0000 0 0 0 1111 1111 1111 1111 FFFF -1 -0.0031 0 1101 0100 0000 0000 D400 -11264 -34.9184 0 1101 0100 0000 0000 D400 -11264 <-34.9184 1 Table 12.7 Measurement magnetic data format (Wide range setting, Z-axis) Measurement data (Z axis) [15:0] bits Magnetic flux density [mT]Two’s complement Hex Decimal 0111 1111 1111 1111 7FFF 32767 >101.5777 0111 1111 1111 1110 7FFE 32766 101.5746 || | | 0000 0000 0000 0001 0001 1 0.0031 0000 0000 0000 0000 0000 0 0 1111 1111 1111 1111 FFFF -1 -0.0031 || | | 1000 0000 0000 0001 8001 -32767 -101.5777 1000 0000 0000 0000 8000 -32768 <-101.5808

[AK09970N] 017006194-E-00 2017/5 -3 5- 12.3.5. CNTL1[15:0]: Interrupt Output Setting Addr. Register name D7 D6 D5 D4 D3 D2 D1 D0 Read/Write register 20h CNTL1[7:0] ERRXYEN SWZ2EN SWZ1EN SWY2EN SWY1EN SWX2EN SWX1EN DRDYEN Reset 0 0 0 0 0 0 0 1 Addr. Register name D15 D14 D13 D12 D11 D10 D9 D8 Read/Write register 20h CNTL1[15:8] 00000 ODINTEN INTEN ERRADCEN Reset 0 0 0 0 0 1 1 0 DRDYEN bit: DRDY event output “0”: DRDY event outputs disable “1”: DRDY event outputs enable Refer to 10.3 for detailed information. SWX1EN bit to SWZ2EN bit: Switch event output “0”: Switch event outputs disable “1”: Switch event outputs enable Refer to 10.4 for detailed information. ERRXYEN bit: ERRXY event output “0”: ERRXY event outputs disable “1”: ERRXY event outputs enable Refer to 10.5.1 for detailed information. ERRADCEN bit: ERRADC event output “0”: ERRADC event outputs disable “1”: ERRADC event outputs enable Refer to 10.5.2 for detailed information. INTEN bit: Interrupt event output to INT pin “0”: Disable (INT pin =”L”) “1”: Enable Refer to 10.6 for detailed information. ODINTEN bit: Interrupt event output to OD-INT pin “0”: Disable (OD-INT pin =”Hi-Z”) “1”: Enable Refer to 10.6 for detailed information.

[AK09970N] 017006194-E-00 2017/5 -3 6- 12.3.6. CNTL2[7:0]: Operation Mode, Sensor Driv e, Measurement Range and Sensitivity setting Addr. Register name D7 D6 D5 D4 D3 D2 D1 D0 Read/Write register 21h CNTL2[7:0] 0 0 SMR SDR MODE3 MODE2 MODE1 MODE0 R e s e t 0 000000 0 MODE[3:0] bits: Operation mode setting “0000”: Power-down mode “0001”: Single measurement mode “0010”: Continuous measurement mode 1 “0100”: Continuous measurement mode 2 “0110”: Continuous measurement mode 3 “1000”: Continuous measurement mode 4 “1010”: Continuous measurement mode 5 “1100”: Continuous measurement mode 6 “1110”: Continuous measurement mode 7 SDR bit: Sensor drive setting “0”: Low noise drive “1”: Low power drive SMR bit: Measurement range and sensitivity setting “0”: High sensitivity setting “1”: Wide measurement range setting

[AK09970N] 017006194-E-00 2017/5 -3 7- 12.3.7. BOP1,2 and BRP1,2 registers: Operating Threshold and Returning Threshold Setting of Programmable Switch Function Addr. Register name D7 D6 D5 D4 D3 D2 D1 D0 Read/Write register 22h 27h BOP1X[7:0] BOP1X7 BOP1X6 BOP1X5 BOP1X4 BOP1X3 BOP1X2 BOP1X1 BOP1X0 BRP1X[7:0] BRP1X7 BRP1X6 BRP1X5 BRP1X4 BRP1X3 BRP1X2 BRP1X1 BRP1X0 BOP2X[7:0] BOP2X7 BOP2X6 BOP2X5 BOP2X4 BOP2X3 BOP2X2 BOP2X1 BOP2X0 BRP2X[7:0] BRP2X7 BRP2X6 BRP2X5 BRP2X4 BRP2X3 BRP2X2 BRP2X1 BRP2X0 BOP1Y[7:0] BOP1Y7 BOP1Y6 BOP1Y5 BOP1Y4 BOP1Y3 BOP1Y2 BOP1Y1 BOP1Y0 BRP1Y[7:0] BRP1Y7 BRP1Y6 BRP1Y5 BRP1Y4 BRP1Y3 BRP1Y2 BRP1Y1 BRP1Y0 BOP2Y[7:0] BOP2Y7 BOP2Y6 BOP2Y5 BOP2Y4 BOP2Y3 BOP2Y2 BOP2Y1 BOP2Y0 BRP2Y[7:0] BRP2Y7 BRP2Y6 BRP2Y5 BRP2Y4 BRP2Y3 BRP2Y2 BRP2Y1 BRP2Y0 BOP1Z[7:0] BOP1Z7 BOP1Z6 BOP1Z5 BOP1Z4 BOP1Z3 BOP1Z2 BOP1Z1 BOP1Z0 BRP1Z[7:0] BRP1Z7 BRP1Z6 BRP1Z5 BRP1Z4 BRP1Z3 BRP1Z2 BRP1Z1 BRP1Z0 BOP2Z[7:0] BOP2Z7 BOP2Z6 BOP2Z5 BOP2Z4 BOP2Z3 BOP2Z2 BOP2Z1 BOP2Z0 BRP2Z[7:0] BRP2Z7 BRP2Z6 BRP2Z5 BRP2Z4 BRP2Z3 BRP2Z2 BRP2Z1 BRP2Z0 Reset 1 1 1 1 1 1 1 1 Addr. Register name D15 D14 D13 D12 D11 D10 D9 D8 Read/Write register 22h 27h BOP1X[15:8] BOP1X15 BOP1X14 BOP1X13 BOP1X12 BOP1X11 BOP1X10 BOP1X9 BOP1X8 BRP1X[15:8] BRP1X15 BRP1X14 BRP1X13 BRP1X12 BRP1X11 BRP1X10 BRP1X9 BRP1X8 BOP2X[15:8] BOP2X15 BOP2X14 BOP2X13 BOP2X12 BOP2X11 BOP2X10 BOP2X9 BOP2X8 BRP2X[15:8] BRP2X15 BRP2X14 BRP2X13 BRP2X12 BRP2X11 BRP2X10 BRP2X9 BRP2X8 BOP1Y[15:8] BOP1Y15 BOP1Y14 BOP1Y13 BOP1Y12 BOP1Y11 BOP1Y10 BOP1Y9 BOP1Y8 BRP1Y[15:8] BRP1Y15 BRP1Y14 BRP1Y13 BRP1Y12 BRP1Y11 BRP1Y10 BRP1Y9 BRP1Y8 BOP2Y[15:8] BOP2Y15 BOP2Y14 BOP2Y13 BOP2Y12 BOP2Y11 BOP2Y10 BOP2Y9 BOP2Y8 BRP2Y[15:8] BRP2Y15 BRP2Y14 BRP2Y13 BRP2Y12 BRP2Y11 BRP2Y10 BRP2Y9 BRP2Y8 BOP1Z[15:8] BOP1Z15 BOP1Z14 BOP1Z13 BOP1Z12 BOP1Z11 BOP1Z10 BOP1Z9 BOP1Z8 BRP1Z[15:8] BRP1Z15 BRP1Z14 BRP1Z13 BRP1Z12 BRP1Z11 BRP1Z10 BRP1Z9 BRP1Z8 BOP2Z[15:8] BOP2Z15 BOP2Z14 BOP2Z13 BOP2Z12 BOP2Z11 BOP2Z10 BOP2Z9 BOP2Z8 BRP2Z[15:8] BRP2Z15 BRP2Z14 BRP2Z13 BRP2Z12 BRP2Z11 BRP2Z10 BRP2Z9 BRP2Z8 Reset 0 1 1 1 1 1 1 1 Operating threshold data of magnetic sensor X-axis/Y-axis/Z-axis BOPX1[7:0] bits: X-axis operating threshold 1 data lower 8-bit BOPX1[15:8] bits: X-axis operating threshold 1 data higher 8-bit BOPY1[7:0] bits: Y-axis operating threshold 1 data lower 8-bit BOPY1[15:8] bits: Y-axis operating threshold 1 data higher 8-bit BOPZ1[7:0] bits: Z-axis operating threshold 1 data lower 8-bit BOPZ1[15:8] bits: Z-axis operating threshold 1 data higher 8-bit BOPX2[7:0] bits: X-axis operating threshold 2 data lower 8-bit BOPX2[15:8] bits: X-axis operating threshold 2 data higher 8-bit BOPY2[7:0] bits: Y-axis operating threshold 2 data lower 8-bit BOPY2[15:8] bits: Y-axis operating threshold 2 data higher 8-bit BOPZ2[7:0] bits: Z-axis operating threshold 2 data lower 8-bit BOPZ2[15:8] bits: Z-axis operating threshold 2 data higher 8-bit

[AK09970N] 017006194-E-00 2017/5 -3 8- Returning threshold data of magnetic sensor X-axis/Y-axis/Z-axis BRPX1[7:0] bits: X-axis returning threshold 1 data lower 8-bit BRPX1[15:8] bits: X-axis returning threshold 1 data higher 8-bit BRPY1[7:0] bits: Y-axis returning threshold 1 data lower 8-bit BRPY1[15:8] bits: Y-axis returning threshold 1 data higher 8-bit BRPZ1[7:0] bits: Z-axis returning threshold 1 data lower 8-bit BRPZ1[15:8] bits: Z-axis returning threshold 1 data higher 8-bit BRPX2[7:0] bits: X-axis returning threshold 2 data lower 8-bit BRPX2[15:8] bits: X-axis returning threshold 2 data higher 8-bit BRPY2[7:0] bits: Y-axis returning threshold 2 data lower 8-bit BRPY2[15:8] bits: Y-axis returning threshold 2 data higher 8-bit BRPZ2[7:0] bits: Z-axis returning threshold 2 data lower 8-bit BRPZ2[15:8] bits: Z-axis returning threshold 2 data higher 8-bit AK09970N can set Operating and Returning threshold in two’s complement. It follows the same format as Measurement data. Switch thresholds can be free to set (Settable range: same as measurement 12.3.8. SRST[7:0]: Soft Reset Addr. Register name D7 D6 D5 D4 D3 D2 D1 D0 Read/Write register 30h SRST[7:0] 0000000 S R S T Reset 0 0 0 0 0 0 0 0 SRST bit: Soft reset “0”: Normal “1”: Reset When “1” is set, all registers are initialized. After reset, SRST bit turns to “0” automatically. 12.3.9. I2CDIS[7:0]: I 2C Disable Addr. Register name D7 D6 D5 D4 D3 D2 D1 D0 Read/Write register 31h I2CDIS[7:0] I2CDIS7 I2CDIS6 I2CDIS5 I2CDIS4 I2CDIS3 I2CDIS2 I2CDIS1 I2CDIS0 R e s e t 0 0 000000 This register disables I2C bus interface. I2C bus interface is enabled in default. To disable I2C bus interface, write “00011011” to I2CDIS[7:0] bits. Then I2C bus interface is disabled. Once I2C bus interface is disabled, it is impossible to write other value to I2CDIS register. To enable I2C bus interface, reset AK09970N or input start condition 8 times continuously.

[AK09970N] 017006194-E-00 2017/5 -3 9- 12.3.10. TST1[15:0]/TST2[7:0]: Test register Addr. Register name D7 D6 D5 D4 D3 D2 D1 D0 Read/Write register Reset 0 0 0 0 0 0 0 0 Addr. Register name D15 D14 D13 D12 D11 D10 D9 D8 Read/Write register Reset 0 0 0 0 0 0 0 0 TST1 and TST2 register are test register for shipment test. Do not access this registers.

[AK09970N] 017006194-E-00 2017/5 -4 0- 13. Recommended External Circuits 13.1. I2C Bus Interface

[AK09970N] 017006194-E-00 2017/5 -4 1- 13.2. 4-wire SPI

-4 2- 14. Package 14.1. Outline Dimensions [mm] 14.2. Pad Dimensions 2.250.575 0.300.50 3.00rr0.05 1 4 1 2 9 3.00rr0.05 AB 0.75rr0.050.05 0.50 REF. 0.25rr0.05 1.8rr0.10 4 1 1.8rr0.10 0.25 REF. 0.35rr0.05 9 1 2 C0.25

0.10 M C A B

0.45 REF. <Top view> <Bottom view> <Side view>

-4 3- 14.3. Marking Product name: 9970 Date code: X1X2X3X4X5 X1 = ID X2 = Year code X3X4 = Week code X5 = Lot 14.4. Pin Assignment AKM 9970 <Top view> 1 2 3 4 8 NC 7 NC 6 SO

5 SDA/SI

<Top view>

-4 4- 15. Magnetic Orientation

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