L9953LXP datasheet(28/35 Pages) STMICROELECTRONICS

28 / 35 page

Functional description of the SPI

L9953LXP

28/35

Doc ID 16185 Rev 3

Table 19.

SPI - input data and status registers 1

Bit

Input register 1 (write)

Status register 1 (read)

Name

Comment

Name

Comment

Enable bit

If enable bit is set the device

will be switched in active

mode. If enable bit is cleared

device goes into standby mode

and all bits are cleared. After

power-on reset device starts in

standby mode.

Always 1

A broken VCC or SPI

connection of the

L9953LXP can be

detected by the

microcontroller, because

all 24 bits low or high is

not a valid frame.

OUT8 OC

recovery

enable

In case of an over-current

event the over-current status

bit (status register 0) is set and

the output is switched off. If the

over-current recovery enable

bit is set the output will be

automatically reactivated after

a delay time resulting in a

PWM modulated current with a

programmable duty cycle (bit

21 of input data register 0).

Depending on occurrence of

over-current event and internal

clock phase it is possible that

one recovery cycle is executed

even if this bit is set to zero.

VS overvoltage

In case of an overvoltage

or under voltage event

the corresponding bit is

set and the outputs are

deactivated. If Vs voltage

recovers to normal

operating conditions

outputs are reactivated

automatically.

0 / 1

VS undervoltage

OUT7 OC

recovery

enable

Thermal shutdown

In case of a thermal

shutdown all outputs are

switched off. The

microcontroller has to

clear the TSD bit by

setting the reset bit to

reactivate the outputs.

OUT6 OC

recovery

enable

Temperature

warning

The TW bit can be used

for thermal management

by the microcontroller to

avoid a thermal

shutdown. The

microcontroller has to

clear the TW bit.

0 / 1

Not ready bit

After switching the

device from standby

mode to active mode an

internal timer is started to

allow charge pump to

settle before the outputs

can be activated. This bit

is only present during

start up time

Since this bit is

controlled by internal

clock it can be used for

synchronizing testing

events(e.g. measuring

filter times).

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