L9951 datasheet(24/36 Pages) STMICROELECTRONICS

24 / 36 page

Functional description of the SPI

L9951 / L9951XP

24/36

Doc ID 14173 Rev 9

Table 18.

Test mode

LS1 HS1

LS2 HS2

LS3 HS3

LS1 HS1

LS2 HS2

LS3 HS3

! (both HI)

NoError

! (both HI)

N.C

both HI

! (both HI)

both HI

! (both HI)

Tsense1

! (both HI)

both HI

! (both HI)

CLK

! (both HI)

both HI

! (both HI)

Tsense2

both HI

! (both HI)

INT_CLK

both HI

! (both HI)

Tsense3

! (both HI)

both HI

PWM

! (both HI)

both HI

Tsense4

both HI

! (both HI)

both HI

N.C

! (both HI)

both HI

5µA Iref

both HI

Vbandgap

Table 19.

SPI - Input data and status register 0

Input register 0 (write)

Status register 0 (read)

Bit

Name

Comment

Name

Comment

Reset bit

If reset bit is set both status

registers will be cleared after

rising edge of CSN input.

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.

Disable open-

load

If the disable open-load bit is

set, the open-load status

bits will be ignored for the

NonErrorBit calculation.

over-voltage

In case of an over-voltage or

undervoltage event the

corresponding bit is set and

the outputs are deactivated.

OC recovery

duty cycle

0: 12% 1: 25%

This bit defines in

combination with the over-

current recovery bit (input

over-current condition of an

activated driver. If

temperature warning bit is

set, L9951 will always use

the lower duty cycle

undervoltage

If VS voltage recovers to

normal operating conditions

outputs are reactivated

automatically.

Overvoltage/

under-voltage

recovery

disable

If this bit is set the

microcontroller has to clear

the status register after

undervoltage/overvoltage

event to enable the outputs.

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.

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