L9680 datasheet(186/286 Pages) STMICROELECTRONICS

186 / 286 page

Remote sensor interface

L9680

186/286

DS11615 Rev 7

Besides, in case of VDA selected, the ASIC is also able to recognize the current value

of the speed pulse by computing a second threshold (named Ith2): Ith2 = IB0 + Ith1 +



Ith2/2 where Ith2 in the range from 10 mA to 18.6 mA (default is 14 mA)



Fixed current trip points where the thresholds are set via SPI. The default value for first

threshold is 9.8 mA and for second threshold is 19.6 mA

Figure 45. Wheel speed sensor protocols

Three level current

(VDA compliant sensor

with Manchester encoded

information)

Two level current

(Standard compliant sensor

with only speed information)

Two level current PWM

(One pulse per tooth with data

encoded in pulse width)

Two level current PWM

(Two pulses per tooth with

data and diagnostic encoded

in pulse width)

WSx pin

(Pass-through mode)

(normal mode)

WSx pin

Data by WSx pin and duty cycle by SPI

WSx pin

Data by WSx pin (Pass-through mode)

(Pass-through mode)

(normal mode)

WSx pin

Data by WSx pin and duty cycle by SPI

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 speed not all bits can be transmitted. The data register for each wheel contains the number of data bits

received between two speed pulses.

14 mA

28 mA

7 mA

14 mA

45 μs

45 μs n x 45 μs

45 μs

90 μs

7 mA

14 mA

7 mA

45 μs - right rotation

90 μs - left rotation

db0

high high low high low high high high high

db1 db2 db3 db4 db5 db6 db7

TH1

THopen

TH2

GAPGPS02285

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