L9952XP datasheet(25/68 Pages) STMICROELECTRONICS

25 / 68 page

L9952GXP

Protection and diagnosis

Doc ID 13518 Rev 5

25/68

Protection and diagnosis

3.1

Power supply fail

Over and under-voltage detection on Vs.

3.1.1

Over voltage

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

●

The outputs HS1..4, OUT_HS, Rel1,2, and LIN are switched to high impedance state

(load protection)

●

The over voltage bit is set and can be cleared with the clear bit (CR1,CLR)

●

Automatic recovery after Vs over-voltage; selectable via SPI (CR2, bit4)

3.1.2

Under voltage

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

●

The outputs HS1..4, OUTHS, Rel1,2, and LIN are switched to high impedance state

(load protection)

●

The under voltage bit is set

●

Automatic recovery after Vs under-voltage; selectable via SPI (CR2, bit4)

3.2

Temperature warning and thermal shutdown

See state chart: “ Protection and diagnosis”.

3.3

SPI diagnosis

Digital diagnosis features are provided by SPI:

●

V1 reset threshold programmable

●

Over temperature including pre warning

●

Open load separately for each output stage

●

Overload status

●

Vs-supply over/under voltage

●

V1 and V2 fail bit

●

Status of the WU1...4, LIN and INH pin

●

Cold start bit

●

Number of unsuccessful V1 restarts after thermal shutdown

●

Number of sequential watchdog failures

●

Status of watchdog trigger bit TRIG: (SR1, Bit 16)

●

LIN status (short to ground, short to VBAT, dominant TxD)

See the following state chart: “Protection and diagnosis”.

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