AK09912 Datasheet, PDF (2/42 Pages) HuaXinAn Electronics CO.,LTD – 3-axis Electronic Compass

2. Overview
[AK09912]
AK09912 is 3-axis electronic compass IC with high sensitive Hall sensor technology.
Small package of AK09912 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.
AK09912 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:
16-bit (0.15 µT/LSB)
 Measurement range:
±4900 µT
 Average current at 100 Hz repetition rate: 1 mA (typ.)
(3) Digital serial interface
 I²C bus interface to control AK09912 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-wire SPI is also supported. A dedicated power supply for SPI can work in low-voltage apply as low as
1.65V.
(4) DRDY pin and register inform 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.
(7) Built-in NSF (Noise Suppression Filter) keeps magnetic sensor output stable.
(8) Built-in temperature sensor to monitor the temperature while operation.
MS1547-E-02
-2-
2014/7