AK7451 Datasheet, PDF (4/32 Pages) Asahi Kasei Microsystems – zero latency angle sensor ic

[AK7451]
Table 1. Description of circuit block
Circuit Block
Function
Si monolithic Hall elements. These detect X/Y-compositions of
HE-X/Y
flux which are parallel to the IC package surface by using the
magnetic concentrator and converts to an electrical signal.
X_CHOP, Y_CHOP
Switch its direction of drive current in order to lower offset and
noise for the Hall elements.
HE Drive
Drive Hall elements by constant current.
PRA_X,PRA_Y
Amplify signals from Hall elements.
PRA_SWAP
Reduce mismatch of each amplifier gain and Hall element
current.
ADC_X，ADC_Y
AD converter for converting the Hall electromotive force signal
amplified in the preamplifier into a digital signal.
OSC_8MEG
Generate a master clock (8 MHz).
V & I Reference
Generate reference voltage / current.
Type2 Tracking Loop
Closed loop circuit to calculate an angle from the digitalized Hall
signal.
POR
Power-On-Reset circuit.
REGULATE_ANA
Regulate the power supply voltage and generate the internal
ARVDD which is for analog circuit.
REGULATE_DIG
Regulate the power supply voltage and generate the internal
DRVDD which is for digital circuit.
EEPROM
Non-volatile memory.
Fault Detector
Detect abnormal status such as magnetic flux density range and
losing tracking state.
Encoder Logic
Generate ABZ and UVW phase signal based on absolute angle
data.
Serial IF
4-wire SPI interface circuit.
ESD
Protection circuit for ESD
016006637-E-00
-4-
2016/05