L99MOD51XP datasheet(25/33 Pages) STMICROELECTRONICS

25 / 33 page

DS12667 Rev 6

25/33

L99MOD51XP

Functional description of the SPI

OUT5 - HS

on/off

If a bit is set the selected

output driver is switched on.

If the corresponding PWM

enable bit is set (Input

activated if PWM input

signal is high. The outputs of

OUT1-OUT3 are half

bridges. If the bits of HS-

and LS-driver of the same

half bridge are set, the

internal logic prevents that

both drivers of this output

stage can be switched on

simultaneously in order to

avoid a high internal current

from VS to GND.

OUT5-HS

over - current

In case of an over-current

event the corresponding status

bit is set and the output driver

is disabled. If the over-current

recovery enable bit is set

(Input Register 1) the output

will be automatically

reactivated after a delay time

resulting in a PWM modulated

current with a programmable

duty cycle (Bit 13).

If the over-current recovery bit

is not set the microcontroller

has to clear the over-current

bit (reset bit) to reactivate the

output driver.

OUT4 - HS

on/off

OUT4-HS

over - current

OUT3 - HS

on/off

OUT3-HS

over - current

OUT3 - LS

on/off

OUT3-LS

over - current

OUT2 - HS

on/off

OUT2-HS

over - current

OUT2 - LS

on/off

OUT2-LS

over - current

OUT1 - HS

on/off

OUT1-HS

over - current

OUT1 - LS

on/off

OUT1-LS

over - current

No error bit

A logical NOR-combination of

all bits 1 to 14 in both status

registers. If bit 14 (disable

open-load) is set, the open-

load status will be ignored.

Table 19. SPI - Input data and status register 1

Input register 1 (write)

Status register 1 (read)

Bit

Name

Comment

Name

Comment

Not used

Always 1

A broken VCC-or SPI-

connection of the

L99MOD51XP can be

detected by the

microcontroller, because all

16 bits low or high are not a

valid frame.

Not used

VS over-voltage

In case of an over-voltage or

undervoltage event the

corresponding bit is set and

the outputs are deactivated.

Not used

VS undervoltage

In case of an over-voltage or

undervoltage event the

corresponding bit is set and

the outputs are deactivated.

Table 18. SPI - Input data and status register 0 (continued)

Input register 0 (write)

Status register 0 (read)

Bit

Name

Comment

Name

Comment

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