L99MOD54XP datasheet(27/35 Pages) STMICROELECTRONICS

27 / 35 page

DS12616 Rev 4

27/35

L99MOD54XP

Functional description of the SPI

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 is

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

L99MOD54XP can be

detected by the

microcontroller, because all

24 bits low or high is not a

valid frame.

OUT6 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

is 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

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

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.

x (don’t care)

VS undervoltage

OUT5 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.

OUT4 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.

x (don’t care)

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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