L99PM62XP datasheet(35/98 Pages) STMICROELECTRONICS

35 / 98 page

L99PM62XP

Protection and diagnosis

Doc ID 16363 Rev 4

35/98

Protection and diagnosis

3.1

Power supply fail

Over and under-voltage detection on Vs

3.1.1

Vs overvoltage

If the supply voltage Vs reaches the over voltage threshold (VSOV):

●

Outputs OUTx, RELx and LIN are switched to high impedance state (load protection).

CAN is not disabled. Recovery of outputs when the overvoltage condition disappears is

depending on the setting of VLOCKOUT_EN bit in Control Register 4.

–

VLOCKOUT_EN = 1: Outputs are off until read and clear SR3.

–

VLOCKOUT_EN = 0: Outputs switch automatically on when overvoltage condition

disappears.

●

The over voltage bit is set and can be cleared with a ‘Read and Clear’ command. The

overvoltage bit is removed automatically if VLOCKOUT_EN = 0 and the overvoltage

condition disappears.

●

Outputs REL1,2 can be excluded from a shutdown in case of overvoltage by SPI

(LSOVUV_ Shutdown_en in CR4)

3.1.2

Vs undervoltage

If the supply voltage Vs drops below the under voltage threshold voltage (VSUV)

●

Outputs OUTx, RELx and LIN are switched to high impedance state (load protection).

CAN is not disabled. Recovery of outputs when the undervoltage condition disappears

is depending on the setting of VLOCKOUT_EN bit.

VLOCKOUT_EN = 1: Outputs are off until read and clear SR3.

VLOCKOUT_EN = 0: Outputs switch on automatically when undervoltage condition

disappears.

●

The undervoltage bit is set and can be cleared with a ‘Read and Clear’ command. The

undervoltage bit is removed automatically if VLOCKOUT_EN = 0 and the undervoltage

condition disappears

●

Outputs REL1,2 can be excluded from a shutdown in case of undervoltage by SPI

(LSOVUV_shutdown_en in CR4)

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