L99PM62XP datasheet(39/98 Pages) STMICROELECTRONICS

39 / 98 page

L99PM62XP

Protection and diagnosis

Doc ID 16363 Rev 4

39/98

The low-side drivers switch off in case of:

●

Vs over and undervoltage

●

Over current

●

Overtemperature with pre warning

In case of overload or overtemperature (TSD1) condition, the drivers switches 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 over/undervoltage condition, the drivers is switched off. The according status bit

is latched and can be read and optionally cleared by SPI. If the Vlockout bit (Control

set to ‘0’ the drivers is switched on automatically if the error condition disappears.

With the LSOVUV_shutdown_en bit (Control Register 4) the drivers can be excluded from a

switch off in case of Vs over/undervoltage. If the bit is set to ‘1’ the driver switchs 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 over/under voltage

●

V1 and V2 fail bit

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V2 output short to GND

●

Status of the WU1 to 3

●

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

●

chip reset bit (start from power-on reset)

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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)

●

Fail-safe status

●

SPI communication error

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