AK8775 Datasheet, PDF (2/10 Pages) Asahi Kasei Microsystems – Hall IC for Pulse Encoder

Block Diagram
VDD
VSS
HALL SENSORS
BIAS
OSC
HE_DRIVE
TIMING LOGIC
CHOP_AMP
COMP
[AK8775]
OUTA
OUTB
Figure 1. Block diagram
Block
HALL SENSORS
CHOPPER_SW
CHOP_AMP
COMP
BIAS
HE_DRIVE
OSC
TIMING LOGIC
LATCH & LOGIC
Circuit Configuration
Table 1. Circuit configuration
Function
Two Hall elements fabricated by CMOS process.
Perform chopping in order to cancel the offset of Hall sensor.
Amplifies two Hall sensor output voltage with summation and subtraction
circuit.
Hysteresis comparator.
Generates bias current to other circuits.
Generates bias current for Hall sensors.
Generates operating clock.
Generates timing signal required for Chopper SW, AMP and COMP.
Logical circuits and CMOS output buffer.
MS1316-E-00
2
2011/July