AK7401 Datasheet, PDF (3/29 Pages) Asahi Kasei Microsystems – Rotary Position Sensor IC

[AK7401]
5. Functional Block Diagram
VDD
TEST0 TEST1
Rev. Vol.
Protection
Overvoltage
Protection
Voltage
Regulator
POR
Diagnostic
HE-X
HE-Y
PreAmp
INT(X)
INT(Y)
Angle
Detection
Hall
Drive
OSC
EEPROM
Driven by VCORE
PWM
Serial
I/F
OUT
CS
SCLK
SIN/
SOUT
VSS
Figure 1. Functional Block Diagram
Block name
HE-X / HE-Y
Chopper Switch
PreAmp
Hall Drive
OSC
INT-X / Y
Angle Detection
PWM
Serial I/F
Rev. Vol. Protection
Overvoltage
Protection
Voltage Regulator
POR
EEPROM
Diagnostic
Table 1. Functional Block Description
Function
Detect the X/Y-compositions of the magnetic flux density applied
parallel to the IC package surface by a magnetic concentrator.
Switch the current direction in order to cancel the Hall elements
offset.
Amplify the signals from the Hall elements.
Drive the constant current for the Hall elements.
Generate master clock.
Integrate the amplified signals to reduce the noise.
Calculate the 12-bit angle data from the X/Y integrated signal.
Generate the PWM signal based on the 12-bit angle data.
Interface based on 3-wire serial protocol.
Protect the IC from the reverse connection to the power supply pin.
Protect the IC from an over voltage supply.
Regulate the internal bias voltage.
Generate a reset signal at the time of low supply voltage.
Non-volatile memory. The stored data is triply copied to the other
particular address automatically.
Detect the level of supply voltage, the level of the magnetic flux
density and a mismatch of the triple-redundant configuration
EEPROM data.
014002685-E-01
-3-
2015/07