L99PM72PXP datasheet(47/128 Pages) STMICROELECTRONICS

47 / 128 page

L99PM72PXP

Protection and diagnosis

Doc ID 023553 Rev 3

47/128

In case of overload or overtemperature (TSD1) condition, the drivers switch off. The

according status bit is latched and can be read and optionally cleared by SPI. The drivers

remain off until the status is cleared.

In case VS overvoltage or undervoltage condition, the drivers are switched off. The

according status bit is latched and can be read and optionally cleared by SPI. If the

VLOCK_OUT_EN bit (Control Register 4) is set to ‘1’ the drivers remain off until the status is

cleared. If the VLOCK_OUT_EN bit is set to ‘0’ the drivers are switched on automatically if

the error condition disappears.

With the LS_OV/UV_shutdown_en bit (Control Register 4) the drivers can be excluded from

a switch off in case of VS overvoltage or undervoltage. If the bit is set to ‘1’ the driver

switches off, otherwise the drivers remain on.

3.5

SPI diagnosis

Digital diagnosis features are provided by SPI (for details please refer to Section 6.2: SPI

registers)

●

V1 reset threshold programmable

●

Overtemperature including. pre warning

●

Open load separately for each output stage except REL1/REL2

●

Overload status separately for each output stage

●

VS-supply overvoltage/undervoltage

●

V1 and V2 fail bit

●

V2 output short to GND

●

Status of the WU1...3

●

Wake-up sources (CAN, LIN, SPI, Timer, WU1…3)

●

Chip reset bit (start from power-on reset)

●

Number of unsuccessful V1 restarts after thermal shutdown

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Number of sequential watchdog failures

●

LIN diagnosis (permanent recessive/dominant, dominant TxD)

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CAN diagnosis (permanent recessive/dominant, dominant TxD, recessive RXD)

●

Device State (wake-up from V1_standby or Vbat_standby)

●

Forced Vbat_standby after WD-fail, forced Vbat_standby after overtemperature

●

Watchdog timer state (diagnosis of watchdog)

●

Failsafe status

●

SPI communication error

●

Diagnosis of selective wake functionality according to ISO 11898-6

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