L9951 datasheet(26/36 Pages) STMICROELECTRONICS

26 / 36 page

Functional description of the SPI

L9951 / L9951XP

26/36

Doc ID 14173 Rev 9

Table 20.

SPI - Input data and status register 1

Input register 1 (write)

Status register 1 (read)

Bit

Name

Comment

Name

Comment

Not used

Always 1

A broken VCC-or SPI-

connection of the L9951 can

be detected by the

microcontroller, because all

16 bits low or high is not a

valid frame.

Not used

VS over-voltage

In case of an over-voltage or

undervoltage event the

corresponding bit is set and

the outputs are deactivated.

Not used

VS undervoltage

In case of an over-voltage or

undervoltage event the

corresponding bit is set and

the outputs are deactivated.

Not used

Thermal

shutdown

In case of an thermal

shutdown all outputs are

switched off. The

microcontroller has to clear

the TSD bit by setting the

reset bit to reactivate the

outputs.

Not used

Temperature

warning

This bit is for information

purpose only. It can be used

for a thermal management by

the microcontroller to avoid a

thermal shutdown.

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