AD22157_15 Datasheet, PDF (6/7 Pages) Analog Devices – Wheel Speed Sensor For ABS Systems

PRELIMINARY TECHNICAL DATA
AD22157
Sensor Circuit
NC
NC
Vlow
Vhigh
NC
4.7nF
ECU
Vbat_high
E _{(Battery Voltage)}
T ^Vbat_low
75Ω
Cecu
27V
Supply to additional sensors
E _{Figure 6. Typical Connection in a Wheel Speed Sensing Application}
L ^{A typical automotive application is shown above. The digital output signal is developed across a 75}
ohm resistor. The power supply to the device is conditioned in an ECU to limit “load dump” pulses to
27v.
SO Front of AD22157
faces the wheel
Magnet placed
B ^{against the back side}
O ^{of the AD22157}
Right: Pin 5 to Pin 1
Magnet
Pin 1
Wheel Front View
Package Rear View
Left: Pin 1 to Pin 5
Figure 7. Wheel Direction Diagram
-6-
REV. PrA