L99PM72GXP datasheet(20/129 Pages) STMICROELECTRONICS

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Detailed description

L99PM72GXP

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DocID024767 Rev 4

2.2.6

VBat_standby mode

The transition from Active Mode to VBat_standby mode is initiated by an SPI command.

In VBat_standby Mode, the V1 voltage regulator, relay outputs, LIN and CAN Transmitters are

switched off. High side Outputs and the V2 Regulator remain in the configuration

programmed prior to the standby command.

In VBat_standby mode the current consumption of the L99PM72GXP is reduced to a minimum

level.

An NRESET pulse is generated upon wake-up from Vbat_standby Mode.

Note:

Inputs TXDL, TXDC and CSN must be terminated to GND in Vbat_standby to achieve

minimum standby current.

This can be achieved with the internal ESD protection diodes of the microcontroller

(microcontroller is not supplied in this mode; V1 is pulled to GND).

2.2.7

Wake up from Standby Modes

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

one or more of the following events:

Vbat_standby

WUP or

WUP/WUF(2)

Yes

Wake_CAN

WUP/WUF

Not

applicable

TRX_STBY

CAN timeout

Transition to

TRX_SLEEP

CAN_TO

TRX_SLEEP

SW_EN = 0:

— wake-up according ISO 11898-5 (WUP)

— Flags: Wake_CAN, WUP

SW_EN = 1:

— wake-up according ISO 11898-6 (on WUP/WUF combination)

— Flags: Wake_CAN, WUP, WUF (the WUP flag is set only if the received WUF also contained a WUP)

SW_EN = 0:

— wake-up according ISO 11898-5 (on WUP)

— Flags: Wake_CAN, WUP

SW_EN = 1:

— wake-up according ISO 11898-6 (on WUP/WUF combination)

— After the reception of a wake-up pattern (WUP) the CAN Enhanced Voltage Biasing is turned on until a

CAN timeout is detected

— Flags: Wake_CAN, WUP, WUF

Table 3. CAN wake-up signalization (continued)

Operating

mode

Event

Wake-up

transition to

active

Status flag

Interrupt

Transceiver

state

Table 4. Wake up from Standby Modes

Wake up source

Description

LIN bus activity

Can be disabled by SPI

CAN bus activity

Can be disabled by SPI

Selective Wake-up can be configured by SPI

Level change of WU1 - 3

Can be individually configured or disabled by SPI

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