L99PM60J datasheet(18/75 Pages) STMICROELECTRONICS

18 / 75 page

Detailed description

L99PM60J

18/75

Doc ID 18309 Rev 6

2.7

Fail Safe mode

2.7.1

Temporary failures

L99PM60J enters Fail Safe mode in case of:

●

Watchdog failure

●

V1 turn on failure

–V1 short (V1 < V1fail for t > tv1short)

●

V1 undervoltage (V1 < Vrth for t > tUV1)

–

Fail Safe Mode only entered if VS > VSUV

●

Thermal Shutdown TSD2

●

SPI failure

–

DI stuck to GND or VCC (SPI frame = ’00 00’ or ‘FF FF’)

The Fail Safe functionality is also available in V1-standby Mode. During V1-standby Mode the

Fails Safe Mode is entered in the following cases:

●

V1 undervoltage (V1 < VRTH for t > tV1FS)

–

Fail Safe Mode only entered if VS > VSUV

●

Watchdog failure (if watchdog still running due to IV1 > ICMP)

●

Thermal Shutdown TSD2

In Fail Safe Mode the L99PM60J returns to a default state with all outputs turned off. The

Fail Safe condition is indicated to the remaining system. The conditions during Fails Safe

Mode are:

●

All outputs are turned off

●

All Control Registers are set to default values (except OUT1/FSO configuration).

Write operations to Control Registers are blocked until the Fail Safe condition is

cleared

●

LIN Transmitter and SPI remains on

●

Corresponding Failure Bits in Status Registers are set.

●

FSO Bit (Bit 0 Global Status Register) is set

●

OUT1/FSO is activated if configured as Fail Safe Output

OUT1 is configured as Fail Safe Output unless it is disabled by SPI.

If the Fail Safe Mode was entered it keeps active until the Fail safe condition is removed and

the Fail Safe was read by SPI. Depending on the root cause of the Fail Safe, the actions to

quit Fail safe Mode can be different.

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