L9950 datasheet(14/23 Pages) STMICROELECTRONICS

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L9950

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Bit

Input Register 1 (write)

Status Register 1 (read)

Name

Comment

Name

Comment

OUT11 OC

Recovery Enable

In case of an over-current event the

over-current status bit (Status

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 occurance of

Overcurrent 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

undervoltage event the

corresponding bit is set and

the outputs are deactivated.

If VS voltage recovers to

normal operating conditions

outputs are reactivated

automatically.

OUT10 OC

Recovery Enable

VS undervoltage

OUT9 OC

Recovery Enable

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.

OUT8 OC

Recovery Enable

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.

OUT7 OC

Recovery Enable

Not Ready Bit

After switching the device

from standby mode to active

mode an internal timer is

started to allow chargepump

to settle before the outputs

can be activated. This bit is

cleared automatically after

start up time has finished.

Since this bit is controlled by

internal clock it can be used

for synchonizing testing

events(e.g. measuring filter

times).

Table 9. SPI - Input Data and Status Register (continued)

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