[AK09915]
4. Block Diagram and Functions
3-axis
Hall
sensor
MUX
Chopper
SW
Pre-
AMP
Integrator&ADC
Signal
Processing
OSC1
HE-Drive
Timing
Control
Magnetic source
VREF
OSC2
Interface,
Logic
& Register
RSTN
SCL/SK
SDA/SI
CSB
SO
DRDY
POR
FIFO
CAD0
CAD1
VSS
VDD
VID
Block
3-axis Hall sensor
MUX
Chopper SW
HE-Drive
Pre-AMP
Integrator & ADC
OSC1
OSC2
POR
VREF
FIFO
Interface Logic
&
Register
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 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.
The buffer is capable up to 32sets of data.
Exchanges data with an external CPU.
DRDY pin indicates sensor measurement has ended and data is ready to be read.
I
2
C 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.
Signal Processing
Timing Control
Magnetic Source
015006484-E-02
-4-
2016/7
AKM [ ASAHI KASEI MICROSYSTEMS ]
