L99MOD50XP datasheet(34/42 Pages) STMICROELECTRONICS

34 / 42 page

SPI - control and status registers

L99MOD50XP

34/42

DS12615 Rev 4

5.7

Status register 2

Reserved

Table 29. Status register 1 (read) (continued)

Bit

Name

Comment

Table 30. Status register 2 (read)

Bit

Name

Comment

OUT7 – OC

In case of an over-current event the corresponding status bit OC is set and the output

driver is disabled. 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.

If the over-current recovery bit is not set the micro controller has to clear the over-

current bit to reactivate the output driver.

The open load detection monitors the load current in each activated output stage. If the

load current is below the under-current detection threshold for at least 1 ms (tdOL) the

corresponding under-current bit UC is set. Due to mechanical/electrical inertia of

typical loads a short activation of the outputs (e.g. 3 ms) can be used to test the open

load status without changing the mechanical/electrical state of the loads.

OUT7 – UC

OUT8 – OC

OUT8 – UC

OUT9 – OC

OUT9 – UC

OUT10 – OC

OUT10 – UC

OUT11 – OC

OUT11 – UC

Reserved

under-voltage

In case of an over-voltage 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 (if bit 4 of control register 3 is not set).

over-voltage

Reserved

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