L9952GXP datasheet(13/68 Pages) STMICROELECTRONICS

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L9952GXP

Description

Doc ID 13518 Rev 5

13/68

2.3

Wake up events

A wake-up from standby mode will switch the device to active mode. This can be initiated by

one or more of the following sources:

●

Change of the LIN state at LIN bus interfaces

●

A current at the INH pin (I

≥200uA) controlled by the CAN-transceiver (the CAN

transceiver is not a part of the IC).

●

Positive/negative edge at wake up pins WU1...WU4 -> change of level after going into

stand-by

●

Change of open-load state at OUT1 to 4

●

SPI access in V1-standby mode (CSN is low and first rising edge on CLK)

All wake-up events (except wake-up by LIN, INH or SPI from V1standby mode) generate a

Reset pulse (NReset low for 2ms).

Wake-up events from V1standby by LIN, INH or SPI do not cause a Reset and the Reset

generation is blocked for 2ms, i. e. a watchdog failure during this timeframe will not cause a

reset.

Table 3.

Wake up events

Wake up source

Description

LIN

Always active

INH

Always active

WU1...4

Can be individually disabled via SPI

Open Load at HS outputs

Can be individually disabled via SPI

SPI Access

Always active

(except in VBAT - standby mode)

High level at PWM2 input

VPWM2 > 9V (1)

Only if internal oscillator is running (e. g. in cyclic sense configuration or after wake-up request).

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