L99MOD51XP datasheet(24/33 Pages) STMICROELECTRONICS

24 / 33 page

Functional description of the SPI

L99MOD51XP

24/33

DS12667 Rev 6

Table 18. 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

L99MOD51XP 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, L99MOD51XP 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 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.

Current monitor

select bits

Following current image

(1/10.000) of the HS driver

will be multiplexed to 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.

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).

Not used

Bit 11 Bit 10 Bit 9

Output

OUT1

OUT2

OUT3

OUT4

OUT5

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