Datasheet

[AK09918]
016014242-E-00 2016/11
- 3 -
4. Block Diagram and Functions
3-axis
Hall
sensor
MUX
SDA
Chopper
SW
HE-Drive
Pre-
AMP
Integrator＆ADC
Interface Logic
& Register
SCL
VDD
VREF
Timing
Control
OSC
Magnetic source
VSS
POR
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.
Pre-AMP
Fixed-gain differential amplifier used to amplify the magnetic sensor signal.
Integrator & 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.
I
2
C bus interface using two pins, namely, SCL and SDA. Standard and Fast modes
are supported.
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.