L9950XP datasheet(27/39 Pages) STMICROELECTRONICS

27 / 39 page

L9950 - L9950XP

Functional description of the SPI

Doc ID 10311 Rev 10

27/39

Table 19.

SPI - input data and status registers 0

Bit

Input register 0 (write)

Status register 0 (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 go 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 L9950 can

be detected by the

microcontroller, because all 24

bits low or high is not a valid

frame.

Reset bit

If Reset Bit is set both

status registers will be

cleared after rising edge

of CSN input.

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

(if Bit 20 of status register 0 is

not set).

OC recovery

duty cycle

This bit defines in

combination with the over-

current recovery bit (Input

in over-current condition

of an activated driver.

VS undervoltage

0: 12%

25%

Overvoltage/Un

dervoltage

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.

Depending on

combination of bit 18 and

19 the current image

(1/10.000) of the selected

HS output will be multi-

plexed to the CM output:

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.

Current monitor

select bits

Bit

Output

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 cleared

automatically after start up

time has finished. Since this

bit is controlled by internal

clock it can be used for

synchronizing testing events

(e.g. measuring filter times).

OUT11

OUT1/OUT

OUT5

OUT4

HS driver of OUT1 is only

selected if HS driver

OUT1 is switched on and

HS driver OUT6 is not

activated.

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