L9396 datasheet(45/109 Pages) STMICROELECTRONICS

45 / 109 page

DS12539 Rev 6

45/109

L9396

Remote sensor interface

108

Figure 9. Wheel speed sensor protocol types

GADG2001170743PS

Three levels current

(VDA compliant sensor

with Manchester encoded

information)

Three levels current

(Standard compliant sensor

with only speed information

information)

Two levels current PWM

(One pulse per tooth with data

encoded in pulse width)

Two levels current PWM

(Two pulses per tooth with data

and diagnostic encoded

in pulse width)

WSx pin

Data and diagnostic by SPI: Three level sensors have eight data bits and a parity bit which are written into the register upon

receiving At higher speeds not all bits can be transmitted. The data register for each wheel contains the number of data bits

received between two speed pulses.

Data by WSx pin (Pass-through model)

Data by WSx pin and Duty cycle info by SPI

(Normal mode)

WSx pin

Data by WSx pin and Duty cycle info by SPI

(Normal mode)

(Pass-through model)

high

db0

ITHopen

ITH1

ITH2

db1 db2 db3 db4 db5 db6 db7 p

high

low

highhighhighhigh

low

28mA

ITH1

14mA

7mA

45μs

n x 45μs

45μs

90μs

ITH1

14mA

7mA

ITH1

14mA

7mA

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