VNF9D5F datasheet(32/108 Pages) STMICROELECTRONICS

32 / 108 page

In normal mode, device is configured in latch. As soon as ITOFFSRx is set (at harness protection triggering), a

R&C command is needed for unlatch. When the unlatch command is sent, the counter will retain the value

reached during down counting (no counter reset).

MCUext = 0

Table 34. OTP memory map - MCUext = 0

OTP Memory Map Register (3Eh)

bit 1, bit 0

CHx

OFF

•

DI0: configured as STATUS (Global i²t fault indication active low => OR between all channels fault flag).

•

DI1: configured as F_CTRL (Unlatcher active high for all channels i²t protection at once).

•

DI0 configured as STATUS and DI1 configured as F_CTRL are enabled in both Fail Safe and Normal

modes.

•

Harness protection latches OFF the corresponding channel. ITOFFSRx will be kept high till a R&C

command is acquired. (ITOFFSRx bit remains high even if F_CTRL will unlatch all channels and even if

counters reaches 0).

•

Unlatch through DI1 (F_CTRL) toggling, pulled high for at least 20 μs and then set low, or R&C on

ITOFFSRx. All channels will be unlatched at once. Then, the counter will retain the value reached during

down counting (no counters value reset).

•

F_CTRL = Low → Protection active.

•

F_CTRL = High To Low → Unlatch all channels harness protection, regardless of the counter value (no

counters value reset).

Further information about the OTP programming mode is provided in the dedicated user manual UM3275 (OTP

programming for STi²Fuse devices).

4.4.2

Procedure to turn on the outputs with the direct input DIx

By applying logic level high/low to the pin, it turns ON/OFF the associated OTP selected outputs in fail-safe mode.

In normal mode, the DIx effect is ORed with SPI configuration when the DIENCR bit is set. Then this truth table

specifies the output state:

Table 35. Truth table

DIENCR

SOCRx

Related DIx logic status

OUTPUTx state

OFF

The output channels can be configured to operate in Bulb or LED mode using the Channel Control Register

(CCR). If the relevant bit in CCR is 0, the output is configured in Bulb mode, if it is set to 1, the output is

configured in LED mode (default value is 0).

VNF9D5F

SPI functional description

DS13946 - Rev 8

page 32/108

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