AK09912 Datasheet, PDF (5/42 Pages) HuaXinAn Electronics CO.,LTD – 3-axis Electronic Compass

4.1. Block Diagram
4. Circuit Configuration
[AK09912]
3-axis
Hall
sensor
MUX
Chopper
SW
Pre-
AMP
Integrator＆ADC
Signal
Processing
Magnetic Source
HE-Drive
T-Sensor
VREF
OSC1
Timing
Control
OSC2
Interface,
Logic
& Register
RSTN
SCL/SK
SDA/SI
CSB
SO
DRDY
POR
FUSE ROM
CAD0 CAD1 TST1 TST2 TRG
VSS VDD VID
4.2. Block Function
Block
3-axis Hall sensor
MUX
Chopper SW
HE-Drive
Pre-AMP
T-Sensor
Integrator & ADC
OSC1
OSC2
POR
VREF
Interface Logic
&
Register
Signal Processing
Timing Control
Magnetic Source
FUSE ROM
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.
Temperature sensor. Generate a voltage in proportion to temperature.
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.
Exchanges data with an external CPU.
DRDY 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.
Fuse ROM for adjustment.
MS1547-E-02
-5-
2014/7