AK09911

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[AK09911] MS1526-E-01 20 14/7 - 1 - AK09911 3-axis Electronic Compass 1. Features  A 3-axis electronic compass IC with high sensitive Hall sensor technology.  Best adapted to pedestrian city navigation use for cell phone and other portable appliance.  Functions:  3-axis magnetometer device suitable for compass application  Built-in A to D Converter for magnetometer data out  14-bit data out for each 3-axis magnetic component  Sensitivity: 0.6 µT/LSB (typ.)  Serial interface  I2C bus interface Standard, Fast and High-speed mode (up to 2.5 MHz) compliant with Philips I2C specification Ver.2.1  Operation mode  Power-down, Single measurement, Continuous measurement, Self-test and Fuse ROM access  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  Operating temperatures:  - 30˚C to +85˚C  Operating supply voltage:  Analog power supply +2.4V to +3.6V  Digital Interface supply +1.65V to analog power supply voltage  Current consumption:  Power-down: 3 µA (typ.)  Measurement:  Average current consumption at 100 Hz repetition rate: 2.4 mA (typ.)  Package:  AK09911C 8-pin WL-CSP (BGA): 1.2 mm × 1.2 mm × 0.5 mm (typ.)

[AK09911] MS1526-E-01 20 14/7 - 2 - 2. Overview AK09911 is 3-axis electronic compass IC with high sensitive Hall sensor technology. Small package of AK09911 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 GPS-equipped cell phone to realize pedestrian navigation function. AK09911 has the following features: (1) Silicon monolithic Hall-effect magnetic sensor with magnetic concentrator realizes 3-axis magnetometer on a silicon chip. Analog circuit, digital logic, power block and interface block are also integrated on a chip. (2) Wide dynamic measurement range and high resolution with lower current consumption.  Output data resolution: 14-bit (0.6 µT/LSB)  Measurement range: ±4900 µT  Average current at 100 Hz repetition rate: 2.4 mA (typ.) (3) Digital serial interface  I2C bus interface to control AK09911 functions and to read out the measured data by external CPU. A dedicated power supply for I2C bus interface can work in low-voltage apply as low as 1.65V . (4) DRDY register informs to system that measurement is end and set of data in registers are ready to be read. (5) Device is worked by on-chip oscillator so no external clock source is necessary. (6) Self test function with internal magnetic source to confirm magnetic sensor operation on end products.

[AK09911] MS1526-E-01 20 14/7 - 3 - 3. Table of Contents

[AK09911] MS1526-E-01 20 14/7 - 4 -

[AK09911] MS1526-E-01 20 14/7 - 5 - 4. Circuit Configration 4.1. Block Diagram 3-axis Hall sensor MUX SDA Chopper SW HE-Drive Pre- AMP Integrator＆ADC Interface Logic & Register SCL VDD VREF Timing Control VID OSC Magnetic source VSS POR FUSE ROM TST RSTN CAD 4.2. Block Function Block Function 3-axis Hall sensor Monolithic Hall elements. MUX Multiplexer for selecting Hall elements. Chopper SW Performs chopping. HE-Drive Magnetic sensor drive circuit for constant-current driving of sensor. Pre-AMP Fixed-gain differential amplifier used to amplify the magnetic sensor signal. Intergrator & ADC Integrates and amplifies pre-AMP output and performs analog-to-digital conversion. OSC Generates an operating clock for sensor measurement. POR Power On Reset circuit. Generates reset signal on rising edge of VDD. VREF Generates reference voltage and current. Interface Logic Register Exchanges data with an external CPU. I2C bus interface using two pins, namely, SCL and SDA. Standard, Fast and High-speed modes are supported. The low-voltage specification can be supported by applying 1.65V to the VID pin. Timing Control Generates a timing signal required for internal operation from a clock generated by the OSC. Magnetic Source Generates magnetic field for self test of magnetic sensor. FUSE ROM Fuse for adjustment.

[AK09911] MS1526-E-01 20 14/7 - 6 - 4.3. Pin Function Pin No. Pin name I/O Power supply Type Function A1 VDD - - Power Positive power supply pin. A2 CAD I VDD CMOS Slave address input pin. Connect to VSS or VDD, A3 TST I/O VDD CMOS Test pin. Pulled down by 100kΩ internal resister. Keep this pin electrically non-connected. B1 VSS - - Power Ground pin. B3 SCL I VID CMOS Control data clock input pin Input: Schmidt trigger C1 VID - - Power Digital interface positive power supply pin. C2 RSTN I VID CMOS Reset pin. Resets registers by setting to “L”. C3 SDA I/O VID CMOS Control data input/output pin Input: Schmidt trigger, Output: Open drain

[AK09911] MS1526-E-01 20 14/7 - 7 - 5. Overall Characteristics 5.1. Absolute Maximum Ratings Vss=0V Parameter Symbol Min. Max. Unit Power supply voltage (Vdd, Vid) V+ -0.3 +4.3 V Input voltage VIN -0.3 （V+）+0.3 V Input current IIN - ±10 mA Storage temperature Tst -40 +125 ˚C (Note 1) If the device is used in conditions exceeding these values, the device may be destroyed. Normal operations are not guaranteed in such exceeding conditions. 5.2. Recommended Operating Conditions Vss=0V Parameter Remark Symbol Min. Typ. Max. Unit Operating temperature Ta -30 +85 ˚C Power supply voltage VDD pin voltage Vdd 2.4 3.0 3.6 V VID pin voltage Vid 1.65 Vdd V 5.3. Electrical Characteristics The following conditions apply unless otherwise noted: Vdd=2.4V to 3.6V, Vid=1.65V to Vdd, Temperature range=-30˚C to 85˚C 5.3.1. DC Characteristics Parameter Symbol Pin Condition Min. Typ. Max. Unit High level input voltage 1 VIH1 RSTN 70%Vid Vid+0.3 V SCL SDA 70%Vid Low level input voltage 1 VIL1 RSTN SCL SDA -0.3 30%Vid V High level input voltage 2 VIH2 TST CAD 70%Vdd Vdd+0.3 V Low level input voltage 2 VIL2 -0.3 30%Vdd V Input current 1 IIN1 RSTN SCL SDA Vin=Vss or Vid -10 +10 µA CAD Vin=Vss or Vdd -10 +10 Input current 2 IIN2 TST Vin=Vdd 100 µA Hysteresis input voltage (Note 2) VHS SCL SDA Vid≥2V 5%Vid V Vid<2V 10%Vid Low level output voltage (Note 3) VOL SDA IOL≤+3mA Vid≥2V 0.4 V IOL≤+3mA Vid<2V 20%Vid Current consumption (Note 4) IDD1 VDD VID Power-down mode Vdd=Vid=3.0V 3 6 µA IDD2 When magnetic sensor is driven 3 6 mA IDD3 Self-test mode 5 8 mA IDD4 (Note 5) 0.1 5 µA

[AK09911] MS1526-E-01 20 14/7 - 8 - (Note 2) Schmitt trigger input (reference value for design) (Note 3) 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 4) Without any resistance load. It does not include the current consumed by external loads (pull-down resister, etc.). RSTN, SDA, SCL = Vid or 0V . CAD = Vdd or 0V. (Note 5) (case 1) Vdd=ON, Vid=ON, RSTN pin = “L”. (case 2) Vdd=ON, Vid=OFF (0V), RSTN pin = “L”. (case 3) Vdd=OFF (0V), Vid=ON. 5.3.2. AC Characteristics Parameter Symbol Pin Condition Min. Typ. Max. Unit Power supply rise time (Note 6) PSUP VDD VID Period of time that VDD (VID) changes from 0.2V to Vdd (Vid). 50 ms POR completion time (Note 6) PORT Period of time after PSUP to Power-down mode (Note 7) 100 µs Power supply turn off voltage (Note 6) SDV VDD VID Turn off voltage to enable POR to restart (Note 7) 0.2 V Power supply turn on interval (Note 6) PSINT VDD VID Period of time that voltage lower than SDV needed to be kept to enable POR to restart (Note 7) 100 µs Wait time before mode setting Twat 100 µs (Note 6) Reference value for design. (Note 7) When POR circuit detects the rise of VDD/VID voltage, it resets internal circuits and initializes the registers. After reset, AK09911 transits to Power-down mode. Parameter Symbol Pin Condition Min. Typ. Max. Unit Reset input effective pulse width (“L”) tRSTL RSTN 5 µs VIL1 tRSTL PSINT PSUP PORT Power-down mode SDV VDD/(VID) Power-down mode

[AK09911] MS1526-E-01 20 14/7 - 9 - 5.3.3. Analog Circuit Characteristics Parameter Symbol Condition Min. Typ. Max. Unit Measurement data output bit DBIT - 14 - bit Time for measurement TSM Single measurement mode 7.2 8.5 ms Magnetic sensor sensitivity (Note 8) BSE Tc = 25 ˚C 0.57 0.6 0.63 µT/LSB Magnetic sensor measurement range (Note 9) BRG Tc = 25 ˚C ±4912 µT Magnetic sensor initial offset (Note 10) Tc = 25 ˚C -500 +500 LSB (Note 8) Value after sensitivity is adjusted using sensitivity fine adjustment data stored in Fuse ROM. (Note 9) Reference value for design (Note 10) Value of measurement data register on shipment without applying magnetic field on purpose.

[AK09911] MS1526-E-01 20 14/7 - 10 - 5.3.4. I2C Bus Interface I2C bus interface is compliant with Standard mode, Fast mode and High-speed mode. Standard/Fast mode is selected automatically by fSCL.  Standard mode fSCL ≤100kHz 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 100Hz≤fSCL≤400kHz 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 [I2C bus interface timing] tHIGH SCL SDA VIH1 tLOW tBUF tHD:STA tR tF tHD:DAT tSU:DAT tSU:STA Stop Start Start Stop tSU:STO VIL1 VIH1 VIL1 tSP SCL VIH1 VIL1 1/fSCL

[AK09911] MS1526-E-01 20 14/7 - 11 -  High-speed mode (Hs-mode)  Cb≤100pF (Cb: load capacitance) fSCLH≤2.5MHz Symbol Parameter Min. Typ. Max. Unit fSCLH SCLH clock frequency 2.5 MHz tHIGH SCLH clock “High” time 110 ns tLOW SCLH clock “Low” time 220 ns tR_CL SCLH rise time 10 40 ns tR_CL1 SCLH rise time after a repeated START condition and after an acknowledge bit 10 80 ns tR_DA SDAH rise time 10 80 ns tF_CL SCLH fall time - 40 ns tF_DA SDAH fall time - 80 ns tHD:STA Start Condition hold time 160 ns tSU:STA Start Condition setup time 160 ns tHD:DAT SDAH hold time (vs. SCLH falling edge) 0 ns tSU:DAT SDAH setup time (vs. SCLH rising edge) 10 ns tSU:STO Stop Condition setup time 160 ns tSP Noise suppression pulse width 10 ns  Cb≤400pF fSCLH≤1.7MHz Symbol Parameter Min. Typ. Max. Unit fSCLH SCLH clock frequency 1.7 MHz tHIGH SCLH clock “High” time 120 ns tLOW SCLH clock “Low” time 320 ns tR_CL SCLH rise time 20 80 ns tR_CL1 SCLH rise time after a repeated START condition and after an acknowledge bit 20 160 ns tR_DA SDAH rise time 20 160 ns tF_CL SCLH fall time - 80 ns tF_DA SDAH fall time - 160 ns tHD:STA Start Condition hold time 160 ns tSU:STA Start Condition setup time 160 ns tHD:DAT SDAH hold time (vs. SCLH falling edge) 0 ns tSU:DAT SDAH setup time (vs. SCLH rising edge) 10 ns tSU:STO Stop Condition setup time 160 ns tSP Noise suppression pulse width 10 ns

[AK09911] MS1526-E-01 20 14/7 - 12 - [I2C bus interface timing of Hs-mode] SCLH VIH1 VIL1 1/fSCLH VIH1 VIL1 VIH1 VIL1 SDAH SCLH START START STOP Tf_D Tr_D tr_CL1 Tr_CL1 Tr_CL tf_CL tHIGH tLOW tHIGH tHD;DAT tSU;DAT tSU;STO tSU;STA tHD;STA

[AK09911] MS1526-E-01 20 14/7 - 13 - 6. Function Explanation 6.1. Power States When VDD and VID are turned on from Vdd=OFF (0V) and Vid=OFF (0V), all registers in AK09911 are initialized by POR circuit and AK09911 transits to Power-down mode. All the states in the table below can be set, although the transition from state 2 to state 3 and the transition from state 3 to state 2 are prohibited. Table 6.1. Power state State VDD VID Power state 1 OFF (0V) OFF (0V) OFF (0V). It doesn’t affect external interface.Digital input pins other than SCL and SDA pin should be fixed to “L”(0V). 2 OFF (0V) 1.65V to 3.6V OFF (0V) It doesn’t affect external interface. 3 2.4V to 3.6V OFF (0V) OFF(0V) It doesn’t affect external interface. Digital input pins other than SCL and SDA pin should be fixed to “L”(0V). 4 2.4V to 3.6V 1.65V to Vdd ON 6.2. Reset Functions When the power state is ON, always keep Vid≤Vdd. 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 deactivated, all registers are initialized and transits to Power-down mode. When Vdd=2.4 to 3.6V, POR circuit and VID monitor circuit are active. When Vid=0V, AK09911 is in reset status and it consumes the current of reset state (IDD4). AK09911 has four types of reset; (1) Power on reset (POR) When Vdd rise is detected, POR circuit operates, and AK09911 is reset. (2) VID monitor When VID is turned OFF, AK09911 is reset. (3) Reset pin (RSTN) AK09911 is reset by Reset pin. When Reset pin is not used, connect to VID. (4) Soft reset AK09911 is reset by setting SRST bit. When AK09911 is reset, all registers are initialized and AK09911 transits to Power-down mode.

[AK09911] MS1526-E-01 20 14/7 - 14 - 6.3. Operation Mode AK09911 has following nine operation modes: (1) Power-down mode (2) Single measurement mode (3) Continuous measurement mode 1 (4) Continuous measurement mode 2 (5) Continuous measurement mode 3 (6) Continuous measurement mode 4 (7) Self-test mode (8) Fuse ROM access mode By setting CNTL2 register MODE[4:0] bits, the operation set for each mode is started. A transition from one mode to another is shown below. MODE[4:0]=“00001” MODE[4:0]=“00000” Transits automatically MODE[4:0]=“00010” MODE[4:0]=“00000” MODE[4:0]=“00100” MODE[4:0]=“00000” MODE[4:0]=“00110” MODE[4:0]=“00000” MODE[4:0]=“01000” MODE[4:0]=“00000” MODE[4:0]=“10000” MODE[4:0]=“00000” Transits automatically MODE[4:0]=“11111” MODE[4:0]=“00000” Power-down mode Continuous measurement mode 2 Sensor is measured periodically in 20Hz. Transits to Power-down mode by writing MODE[4:0]=“00000”. Self-test mode Sensor is self-tested and the result is output. Transits to Power-down mode automatically. Single measurement mode Sensor is measured for one time and data is output. Transits to Power-down mode automatically after measurement ended. Continuous measurement mode 1 Sensor is measured periodically in 10Hz. Transits to Power-down mode by writing MODE[4:0] = “00000”. Continuous measurement mode 3 Sensor is measured periodically in 50Hz. Transits to Power-down mode by writing MODE[4:0]=“00000”. Continuous measurement mode 4 Sensor is measured periodically in 100Hz. Transits to Power-down mode by writing MODE[4:0]=“00000”. Fuse ROM access mode Turn on the needed to read out Fuse ROM. Transits to Power-down mode by writing MODE[4:0]=“00000”. Figure 6.1. Operation mode When power is turned ON, AK09911 is in Power-down mode. When a specified value is set to MODE[4:0], AK09911 transits to the specified mode and starts operation. When user wants to change operation mode, transit to Power-down mode first and then transit to other modes. After Power-down mode is set, at least 100 µs (Twat) is needed before setting another mode

[AK09911] MS1526-E-01 20 14/7 - 17 - 6.4.3.4. Data Read Start during Measurement When sensor is measuring (Measurement period), measurement data registers (HXL to TMPS) keep the previous data. Therefore, it is possible to read out data even in measurement period. If data is started to be read during measurement period, previous data is read. (N-1)th Nth (N+1)th PD Measurement PD Measurement PD Measurement Data Register (N-1)th Nth DRDY Data read ST1 Data(N) ST2 ST1 Data(N) ST2 Figure 6.6. Data read start during measurement

[AK09911] MS1526-E-01 20 14/7 - 19 - 6.4.3.7. Magnetic Sensor Overflow AK09911 has the limitation for measurement range that the sum of absolute values of each axis should be smaller than 4912 μT. When the magnetic field exceeded this limitation, data stored at measurement data are not correct. This is called Magnetic Sensor Overflow. When magnetic sensor overlow occurs, HOFL bit turns to “1”. When the next measurement starts, it returns to “0”. 6.4.4. Self-test Mode Self-test mode is used to check if the magnetic sensor is working normally. When Self-test mode (MODE[4:0]=“10000”) is set, magnetic field is generated by the internal magnetic source and magnetic sensor is measured. Measurement data is stored to measurement data registers (HXL to HZH), then AK09911 transits to Power-down mode automatically. Data read sequence and functions of read-only registers in Self-test mode is the same as Single measurement mode. 6.4.4.1. Self-test Sequence (1) Set Power-down mode. (MODE[4:0]=“00000”) (2) Set Self-test mode. (MODE[4:0]=“10000”) (3) Check Data Ready or not by polling DRDY bit of ST1 register When Data Ready, proceed to the next step. (4) Read measurement data (HXL to HZH) 6.4.4.2. Self-test Judgment When measurement data read by the above sequence is in the range of following table after sensitivity adjustment (refer to 8.3.11), AK09911 is working normally. Criteria -30 ≤ HX ≤ +30 -30 ≤ HY ≤ +30 -400 ≤ HZ ≤ -50 6.4.5. Fuse ROM Access Mode Fuse ROM access mode is used to read Fuse ROM data. Sensitivity adjustment data for each axis is stored in fuse ROM. Set Fuse ROM Access mode (MODE[4:0]=“11111”) before reading Fuse ROM data. When Fuse ROM Access mode is set, circuits required for reading fuse ROM are turned on. After reading fuse ROM data, set Power-down mode (MODE[4:0]=“00000”) before the transition to another mode.

[AK09911] MS1526-E-01 20 14/7 - 25 - 8. Registers 8.1. Description of Registers AK09911 has registers of 20 addresses as indicated in Every address consists of 8 bits data. Data is transferred to or received from the external CPU via the serial interface described previously. Table 8.1. Register Table Name Address READ/ WRITE Description Bit width Remarks WIA1 00H READ Campany ID 8 WIA2 01H READ Device ID 8 INFO1 02H READ Information 1 8 INFO2 03H READ Information 2 8 ST1 10H READ Status 1 8 Data status HXL 11H READ Measurement Magnetic Data

8 X-axis data

HYL 13H READ 8 Y-axis data HYH 14H READ 8 HZL 15H READ 8 Z-axis data HZH 16H READ 8 TMPS 17H READ Dummy Register 8 Dummy ST2 18H READ Status 2 8 Data status CNTL1 30H READ/ WRITE Dummy Register 8 Dummy CNTL2 31H READ/ WRITE Control 2 8 Control settings CNTL3 32H READ/ WRITE Control 3 8 Control settings TS1 33H READ/ WRITE Test 8 DO NOT ACCESS ASAX 60H READ X-axis sensitivity adjustment value 8 Fuse ROM ASAY 61H READ Y-axis sensitivity adjustment value 8 Fuse ROM ASAZ 62H READ Z-axis sensitivity adjustment value 8 Fuse ROM Addresses 00H to 18H, 30H to 32H and 60H to 62H are compliant with automatic increment function of serial interface respectively. Values of addresses 60H to 62H can be read only in Fuse ROM access mode. In other modes, read data is not correct. When the address is in 00H to 18H, the address is incremented 00H  01H  02H  03H  10H  11H ...  18H, and the address goes back to 00H after 18H. When the address is in 30H to 32H, the address goes back to 30H after 32H. When the address is in 60H to 62H, the address goes back to 60H after 62H.

[AK09911] MS1526-E-01 20 14/7 - 26 - 8.2. Register Map Table 8.2. Register Map Addr. Register name D7 D6 D5 D4 D3 D2 D1 D0 Read-only register 00H WIA1 0 1 0 0 1 0 0 0 01H WIA2 0 0 0 0 0 1 0 1 02H INFO1 INFO17 INFO16 INFO15 INFO14 INFO13 INFO12 INFO11 INFO10 03H INFO2 INFO27 INFO26 INFO25 INFO24 INFO23 INFO22 INFO21 INFO20 10H ST1 HSM 0 0 0 0 0 DOR DRDY 11H HXL HX7 HX6 HX5 HX4 HX3 HX2 HX1 HX0 12H HXH HX15 HX14 HX13 HX12 HX11 HX10 HX9 HX8 13H HYL HY7 HY6 HY5 HY4 HY3 HY2 HY1 HY0 14H HYH HY15 HY14 HY13 HY12 HY11 HY10 HY9 HY8 15H HZL HZ7 HZ6 HZ5 HZ4 HZ3 HZ2 HZ1 HZ0 16H HZH HZ15 HZ14 HZ13 HZ12 HZ11 HZ10 HZ9 HZ8 17H TMPS 0 0 0 0 0 0 0 0 18H ST2 0 0 0 0 HOFL 0 0 0 Read/Wright register 30H CNTL1 0 0 0 0 0 0 0 0 31H CNTL2 0 0 0 MODE4 MODE3 MODE2 MODE1 MODE0 32H CNTL3 0 0 0 0 0 0 0 SRST Read-only register 60H ASAX COEFX7 COEFX6 COEFX5 COEFX4 COEFX3 COEFX2 COEFX1 COEFX0 61H ASAY COEFY7 COEFY6 COEFY5 COEFY4 COEFY3 COEFY2 COEFY1 COEFY0 62H ASAZ COEFZ7 COEFZ6 COEFZ5 COEFZ4 COEFZ3 COEFZ2 COEFZ1 COEFZ0 When VDD is turned ON, POR function works and all registers of AK09911 are initialized regardless of VID status. To write data to or to read data from register, VID must be ON. TS1 is test registers for shipment test. Do not use these registers.

[AK09911] MS1526-E-01 20 14/7 - 27 - 8.3. Detailed of Description of Register 8.3.1. WIA: Who I Am Addr Register name D7 D6 D5 D4 D3 D2 D1 D0 Read-only register 00H WIA1 0 1 0 0 1 0 0 0 01H WIA2 0 0 0 0 0 1 0 1 WIA1[7:0]: Company ID of AKM. It is described in one byte and fixed value. 48H: fixed WIA2[7:0]: Device ID of AK09911. It is described in one byte and fixed value. 0 5H: fixed 8.3.2. INFO: Information Addr Register name D7 D6 D5 D4 D3 D2 D1 D0 Read-only register 02H INFO1 INFO17 INFO16 INFO15 INFO14 INFO13 INFO12 INFO11 INFO10 03H INFO2 INFO27 INFO26 INFO25 INFO24 INFO23 INFO22 INFO21 INFO20 INFO1[7:0]/INFO2[7:0]: Device information of AKM. 8.3.3. ST1: Status 1 Addr Register name D7 D6 D5 D4 D3 D2 D1 D0 Read-only register 10H ST1 HSM 0 0 0 0 0 DOR DRDY Reset 0 0 0 0 0 0 0 0 DRDY: Data Ready “0“: Normal “1“: Data is ready DRDY bit turns to “1” when data is ready in Single measurement mode, Continuous measurement mode 1, 2, 3, 4 or Self-test mode. It returns to “0” when any one of ST2 register or measurement data register (HXL to TMPS) is read. DOR: Data Overrun “0”: Normal “1”: Data overrun DOR bit turns to “1” when data has been skipped in Continuous measurement mode 1, 2, 3, 4. It returns to “0” when any one of ST2 register or measurement data register (HXL to TMPS) is read. HSM: I2C Hs-mode “0”: Standard/Fast mode “1”: Hs-mode HSM bit turns to “1” when I2C bus interface is changed from Standard or Fast mode to High-speed mode (Hs-mode).

[AK09911] MS1526-E-01 20 14/7 - 28 - 8.3.4. HXL to HZH: Measurement data Addr Register name D7 D6 D5 D4 D3 D2 D1 D0 Read-only register 11H HXL HX7 HX6 HX5 HX4 HX3 HX2 HX1 HX0 12H HXH HX15 HX14 HX13 HX12 HX11 HX10 HX9 HX8 13H HYL HY7 HY6 HY5 HY4 HY3 HY2 HY1 HY0 14H HYH HY15 HY14 HY13 HY12 HY11 HY10 HY9 HY8 15H HZL HZ7 HZ6 HZ5 HZ4 HZ3 HZ2 HZ1 HZ0 16H HZH 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 HXL[7:0]: X-axis measurement data lower 8-bit HXH[15:8]: X-axis measurement data higher 8-bit HYL[7:0]: Y-axis measurement data lower 8-bit HYH[15:8]: Y-axis measurement data higher 8-bit HZL[7:0]: Z-axis measurement data lower 8-bit HZH[15:8]: Z-axis measurement data higher 8-bit Measurement data is stored in two’s complement and Little Endian format. Measurement range of each axis is -8190 to 8190. Table 8.3. Measurement magnetic data format Measurement data (each axis) [15:0] Magnetic flux density [µＴ] Two’s complement Hex Decimal 0001 1111 1111 1110 1FFE 8190 4912(max.) | | | | 0000 0000 0000 0001 0001 1 0.6 0000 0000 0000 0000 0000 0 0 1111 1111 1111 1111 FFFF -1 -0.6 | | | | 1110 0000 0000 0010 E002 -8190 -4912(min.) 8.3.5. TMPS: Dummy Register Addr Register name D7 D6 D5 D4 D3 D2 D1 D0 Read-only register 17H TMPS 0 0 0 0 0 0 0 0 Reset 0 0 0 0 0 0 0 0 Dummy register.

[AK09911] MS1526-E-01 20 14/7 - 29 - 8.3.6. ST2: Status 2 Addr Register name D7 D6 D5 D4 D3 D2 D1 D0 Read-only register 18H ST2 0 0 0 0 HOFL 0 0 0 Reset 0 0 0 0 0 0 0 0 HOFL: Magnetic sensor overflow “0”: Normal “1”: Magnetic sensor overflow occurred In Single measurement mode, Continuous measurement mode 1, 2, 3, 4, and Self-test mode, magnetic sensor may overflow even though measurement data regiseter is not saturated. In this case, measurement data is not correct and HOFL bit turns to ST2 register has a role as data reading end register, also. When any of measurement data register (HXL to TMPS) is read in Continuous measurement mode 1, 2, 3, 4, it means data reading start and taken as data reading until ST2 register is read. Therefore, when any of measurement data is read, be sure to read ST2 register at the end. 8.3.7. CNTL1: Dummy Register Addr Register name D7 D6 D5 D4 D3 D2 D1 D0 Read/Write register 30H CNTL1 0 0 0 0 0 0 0 0 Reset 0 0 0 0 0 0 0 0 Dummy register. 8.3.8. CNTL2: Control 2 Addr Register name D7 D6 D5 D4 D3 D2 D1 D0 Read/Write register 31H CNTL2 0 0 0 MODE4 MODE3 MODE2 MODE1 MODE0 Reset 0 0 0 0 0 0 0 0 MODE[4:0]: Operation mode setting “00000”: Power-down mode “00001”: Single measurement mode “00010”: Continuous measurement mode 1 “00100”: Continuous measurement mode 2 “00110”: Continuous measurement mode 3 “01000”: Continuous measurement mode 4 “10000”: Self-test mode “11111”: Fuse ROM access mode Other code settings are prohibited When each mode is set, AK09911 transits to the set mode. Refer to 6.3 for detailed information.

[AK09911] MS1526-E-01 20 14/7 - 30 - 8.3.9. CNTL3: Control 3 Addr Register name D7 D6 D5 D4 D3 D2 D1 D0 Read/Write register 32H CNTL3 0 0 0 0 0 0 0 SRST Reset 0 0 0 0 0 0 0 0 SRST: Soft reset “0”: Normal “1”: Reset When “1” is set, all registers are initialized. After reset, SRST bit turns to “0” automatically. 8.3.10. TS1: Test Addr Register name D7 D6 D5 D4 D3 D2 D1 D0 Read/Write register Reset 0 0 0 0 0 0 0 0 TS1 register is AKM internal test register. Do not use this register. 8.3.11. ASAX, ASAY, ASAZ: Sensitivity Adjustment Values Addr Register name D7 D6 D5 D4 D3 D2 D1 D0 Read-only register 60H ASAX COEFX7 COEFX6 COEFX5 COEFX4 COEFX3 COEFX2 COEFX1 COEFX0 61H ASAY COEFY7 COEFY6 COEFY5 COEFY4 COEFY3 COEFY2 COEFY1 COEFY0 62H ASAZ COEFZ7 COEFZ6 COEFZ5 COEFZ4 COEFZ3 COEFZ2 COEFZ1 COEFZ0 Sensitivity adjustment data for each axis is stored to fuse ROM on shipment. ASAX[7:0]: Magnetic sensor X-axis sensitivity adjustment value ASAY[7:0]: Magnetic sensor Y-axis sensitivity adjustment value ASAZ[7:0]: Magnetic sensor Z-axis sensitivity adjustment value  How to adjust sensitivity The sensitivity adjustment is done by the equation below,  +×= 1128 ASAHHadj where H is the measurement data read out from the measurement data register, ASA is the sensitivity adjustment value, and Hadj is the adjusted measurement data.

[AK09911] MS1526-E-01 20 14/7 - 31 - 9. Example of Recommended External Connection Pins of dot circle should be kept non-connected. C B A AK09911C (Top view) Host CPU I2C I/F Power for I/F VID POWER 1.65V to Vdd VDD POWER 2.4V to 3.6V 0.1µF 0.1µF TST CAD RSTN Slave address select CAD address VSS 0 0 0 1 1 0 0 R/W VDD 0 0 0 1 1 0 1 R/W GPIO 3 2 1 VDD VSS VID SDA SCL

[AK09911] MS1526-E-01 20 14/7 - 32 - 10. Package 10.1. Marking  Date code: X1X2X3X4X5  X1 = ID  X2 = Year code  X3X4 = Week code  X5 = Lot  Product name: 9911 10.2. Pin Assignment 3 2 1 C SDA RSTN VID B SCL VSS A TST CAD VDD <Top view> 9911 X1X2X3X4X5 <Top view>

[AK09911] MS1526-E-01 20 14/7 - 33 - 10.3. Outline Dimensions [mm] 10.4. Recommended Foot Print Pattern [mm] 0.05 C 0.57 max. C 0.40 0.13 0.4 0.8 0.8 0.4 0.24±0.03 3 2 1 1.19±0.03 1.19±0.03 C B A 1 2 3 0.4 0.4 0.23 3 2 1 C B A

[AK09911] MS1526-E-01 20 14/7 - 34 - 11. Relationsip between the Magnetic Field and Output Code The measurement data increases as the magnetic flux density increases in the arrow directions.

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