[AK09916]
4. Block Diagram and Functions
3-axis
Hall
sensor
MUX
Chopper
SW
Pre-
AMP
Integrator＆ADC
OSC
HE-Drive
Interface Logic
& Register
SCL
SDA
VREF
Magnetic source
Timing
Control
POR
TST
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 for constant-current driving of sensor.
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.
I
2
C 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.
015007392-E-02
-3-
2015/12
AKM [ ASAHI KASEI MICROSYSTEMS ]
