AK09918 Datasheet, PDF (3/30 Pages) Asahi Kasei Microsystems – 3-axis Electronic Compass

4. Block Diagram and Functions
[AK09918]
3-axis
Hall
sensor
MUX
Chopper
SW
Pre-
AMP
Integrator＆ADC
Magnetic source
HE-Drive
VREF
OSC
Timing
Control
SCL
Interface Logic
SDA
& Register
POR
VSS VDD
Block
3-axis Hall sensor
MUX
Chopper SW
HE-Drive
Pre-AMP
Integrator & ADC
OSC
POR
VREF
Interface Logic
&
Register
Timing Control
Magnetic Source
Function
Monolithic Hall elements.
Multiplexer for selecting Hall elements.
Performs chopping.
Magnetic sensor drive circuit.
Fixed-gain differential amplifier used to amplify the magnetic sensor signal.
Integrates and amplifies Pre-AMP output and performs analog-to-digital
conversion.
Generates an operating clock for sensor measurement.
Power On Reset circuit. Generates reset signal on rising edge of VDD.
Generates reference voltage and current.
Exchanges data with an external CPU.
I²C bus interface using two pins, namely, SCL and SDA. Standard and Fast modes
are supported.
Generates a timing signal required for internal operation from a clock generated by
the OSC.
Generates magnetic field for Self-test of magnetic sensor.
016014242-E-00
-3-
2016/11