AK09915D

[AK09915D] AK09915D 3-axis Electronic Compass 1. General Description AK09915D is 3-axis electronic compass IC with high sensitive Hall sensor technology. Small package of AK09915D 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 smart phone and tablet 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, Fast and High-speed modes (up to 2.5 MHz) compliant with Philips I2C specification Ver.2.1  4-wire SPI  Operation mode  Power-down, Single measurement, Continuous measurement and Self-test  Open Drain 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 Noise Suppression Filter (NSF)  Selectable sensor drive  Low power drive / Low noise drive  Built-in magnetic sensitivity adjustment circuit  32 FIFO data buffer  Operating temperatures:  -30˚C to +85˚C Operating supply voltage:  Analog power supply +1.7V 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  Low power drive: 0.9 mA (typ.)  Low noise drive: 1.8 mA (typ.) Package:  AK09915D 14-pin WL-CSP (BGA): 1.6 mm  1.6 mm  0.5 mm (typ.)    016009278-E-00 2016/7 -1- [AK09915D] 3. Table of Contents 1. 2. 3. 4. 5. 6. 7. 8. General Description ...................................................................................................................................1 Features ......................................................................................................................................................1 Table of Contents .......................................................................................................................................2 Block Diagram and Functions ....................................................................................................................4 Pin Configurations and Functions ..............................................................................................................5 Absolute Maximum Ratings.......................................................................................................................6 Recommended Operating Conditions ........................................................................................................6 Electrical Characteristics ...........................................................................................................................6 8.1. DC Characteristics ..............................................................................................................................6 8.2. AC Characteristics ..............................................................................................................................7 8.3. ODDRDY AC Characteristics ............................................................................................................8 8.4. Analog Circuit Characteristics ............................................................................................................9 8.5. 4-wire SPI..........................................................................................................................................10 8.6. I2C Bus Interface ...............................................................................................................................11 9. Functional Descriptions ...........................................................................................................................14 9.1. Power States ......................................................................................................................................14 9.2. Reset Functions .................................................................................................................................14 9.3. Operation Modes ...............................................................................................................................15 9.4. Description of Each Operation Mode ...............................................................................................16 9.4.1. Power-down Mode ....................................................................................................................16 9.4.2. Single Measurement Mode ........................................................................................................16 9.4.3. Continuous Measurement Mode 1, 2, 3, 4, 5 and 6 ...................................................................17 9.4.4. Self-test Mode ...........................................................................................................................20 9.5. Noise Suppression Filter (NSF) ........................................................................................................20 9.6. Sensor Drive Select ...........................................................................................................................20 9.7. FIFO ..................................................................................................................................................21 9.7.1. Watermark .................................................................................................................................21 10. Serial Interface ......................................................................................................................................22 10.1. 4-wire SPI..........................................................................................................................................22 10.1.1. Writing Data ..............................................................................................................................22 10.1.2. Reading Data .............................................................................................................................23 10.2. I2C Bus Interface ...............................................................................................................................23 10.2.1. Data Transfer .............................................................................................................................23 10.2.2. WRITE Instruction ....................................................................................................................26 10.2.3. READ Instruction ......................................................................................................................26 10.2.4. High-speed Mode (Hs-mode) ....................................................................................................28 11. Registers................................................................................................................................................29 11.1. Description of Registers ....................................................................................................................29 11.2. Register Map .....................................................................................................................................30 11.3. Detailed Description of Registers .....................................................................................................31 11.3.1. WIA: Who I Am ........................................................................................................................31 11.3.2. RSV: Reserved ..........................................................................................................................31 11.3.3. INFO: Information .....................................................................................................................31 11.3.4. ST1: Status 1 .............................................................................................................................31 11.3.5. HXL to HZH: Measurement magnetic data ..............................................................................32 11.3.6. TMPS: Dummy..........................................................................................................................33 11.3.7. ST2: Status 2 .............................................................................................................................33 11.3.8. CNTL1: Control 1 .....................................................................................................................34 11.3.9. CNTL2: Control 2 .....................................................................................................................35 11.3.10. CNTL3: Control 3 .....................................................................................................................35 11.3.11. TS1, TS2, TS3: Test ..................................................................................................................36 016009278-E-00 2016/7 -2- [AK09915D] 11.3.12. I2CDIS: I2C Disable ..................................................................................................................36 11.3.13. TS4: Test ...................................................................................................................................36 11.3.14. ASAX,ASAY,ASAZ: Dummy ..................................................................................................36 11.3.15. TPH1,TPH2,RR,SYT,DT: Test .................................................................................................37 12. Example of Recommended External Connection .................................................................................38 12.1. I2C Bus Interface ...............................................................................................................................38 12.2. 4-wire SPI..........................................................................................................................................39 13. Package .................................................................................................................................................40 13.1. Marking .............................................................................................................................................40 13.2. Pin Assignment .................................................................................................................................40 13.3. Outline Dimensions...........................................................................................................................41 13.4. Recommended Foot Print Pattern .....................................................................................................41 14. Relationship between the Magnetic Field and Output Code ................................................................42 IMPORTANT NOTICE ...................................................................................................................................43 016009278-E-00 2016/7 -3- [AK09915D] 4. Block Diagram and Functions 3-axis Hall sensor Chopper SW PreAMP Integrator&ADC Signal Processing MUX RSTN OSC1 HE-Drive Timing Control Magnetic source Interface, Logic & Register SCL/SK SDA/SI CSB SO VREF OSC2 OD-DRDY POR FIFO CAD0 CAD1 Block 3-axis Hall sensor MUX Chopper SW HE-Drive Pre-AMP Integrator & ADC OSC1 OSC2 POR VREF FIFO Interface Logic & Register Signal Processing Timing Control Magnetic Source VSS VDD VID Function Monolithic Hall elements. Multiplexer for selecting Hall elements. Performs chopping. Magnetic sensor drive circuit for constant-current driving of sensor. Fixed-gain differential amplifier used to amplify the magnetic sensor signal. Integrates and amplifies pre-AMP output or T-sensor output and performs analog-to-digital conversion. Generates an operating clock for sensor measurement. Generates an operating periodic clock for sequencer. Power on Reset circuit. Generates reset signal on rising edge of VDD. Generates reference voltage and current. The buffer is capable up to 32sets of data. Exchanges data with an external CPU. ODDRDY pin indicates sensor measurement has ended and data is ready to be read. 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. 4-wire SPI is also supported by SK, SI, SO and CSB pins. 4-wire SPI works in VID pin voltage down to 1.65 V, too. Noise suppression function by the filtering process. Filtering process can be enabled or disabled. Generates a timing signal required for internal operation from a clock generated by the OSC1. Generates magnetic field for self-test of magnetic sensor. 016009278-E-00 2016/7 -4- [AK09915D] 5. Pin Configurations and Functions Pin Pin name No. A1 ODDRDY I/O O Power supply VID Type Function Open Drain Open Drain Data Ready output pin. “L” active. Informs measurement ended and data is ready to be read. Connect to VID on contact with pull-up resister. Do not apply more than VID voltage to ODDRDY pin. Chip select pin for 4-wire SPI. “L” active. Connect to VID when selecting I2C bus interface. When the I2C bus interface is selected (CSB pin is connected to VID). SCL: Control clock input pin Input: Schmitt trigger When the 4-wire SPI is selected. SK: Serial clock input pin. When the I2C bus interface is selected (CSB pin is connected to VID). SDA: Control data input/output pin Input: Schmitt trigger, Output: Open-drain When the 4-wire SPI is selected. SI: Serial data input pin A2 CSB I VID CMOS A3 SCL I VID CMOS SDA I/O VID CMOS SI I B1 B3 VDD N/C - - Power - B4 SO O VID CMOS C1 C2 VSS N/C - - Power - C3 N/C - - - C4 D1 VID CAD0 I VDD Power CMOS D2 CAD1 I VDD CMOS D4 RSTN I VID CMOS SK A4 Positive power supply pin. Non-connect Connect to VSS or keep this pin non-connected. When the I2C bus interface is selected (CSB pin is connected to VID) Hi-Z output. Keep this pin electrically non-connected. When the 4-wire SPI is selected. Serial data output pin Ground pin Non-connect Connect to VSS or keep this pin non-connected. Non-connect Connect to VSS or keep this pin non-connected. Digital interface positive power supply pin. When the I2C bus interface is selected (CSB pin is connected to VID) CAD0:Slave address 0 input pin Connect to VSS or VDD. When the 4-wire serial interface is selected. Connect to VSS. When the I2C bus interface is selected (CSB pin is connected to VID). CAD1:Slave address 1 input pin Connect to VSS or VDD. When the 4-wire serial interface is selected. Connect to VSS. Reset pin. Resets registers by setting to “L”. Connect to VID when not in use. 016009278-E-00 2016/7 -5- [AK09915D] 6. Absolute Maximum Ratings Vss = 0V Parameter Power supply voltage (Vdd, Vid) Input voltage (except for power supply pin) Input current (except for power supply pin) Storage temperature Symbol V+ Min. -0.3 Max. +4.3 Unit V VIN -0.3 （V+）+0.3 V IIN - ±10 mA Tst -40 +125 ˚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 Operating temperature Power supply voltage Remark VDD pin voltage VID pin voltage Symbol Ta Vdd Vid Min. -30 1.7 1.65 Typ. 3.0 Max. +85 3.6 Vdd Unit ˚C V V 8. Electrical Characteristics The following conditions apply unless otherwise noted: Vdd = 1.7V to 3.6V, Vid = 1.65V to Vdd, Temperature range = -30 ˚C to +85 ˚C 8.1. DC Characteristics Parameter High level input voltage 1 Symbol VIH1 Low level input voltage 1 High level input voltage 2 Low level input voltage 2 High level input voltage 3 VIL1 VIH2 VIL2 VIH3 Low level input voltage 3 Input current 1 VIL3 IIN1 Hysteresis input voltage (Note 1) VHS High level output voltage 1 (Note 2) Low level output voltage 1 (Note 2) Low level output voltage 2 (Note 2) (Note 3) VOH1 Low level output voltage 3 (Note 3) VOL3 Pin CSB RSTN SK/SCL SI/SDA SK/SCL SI/SDA CSB RSTN CAD0 CAD1 SCL SDA SO SDA ODDRDY Min. 70%Vid 70%Vid -0.3V 70%Vdd CAD0 CAD1 VOL1 VOL2 Condition Typ. Max. Unit V 30%Vid Vid+0.3 30%Vid V V V V V µA Vin = Vss or Vid -10 30%Vdd +10 Vin = Vss or Vdd -10 +10 Vid≥2V Vid