SPSB081 datasheet(16/137 Pages) STMICROELECTRONICS

16 / 137 page

Figure 7. Interrupt pin

Digital

logic

GND

Data Out

Data In

GND

ESD prot

110KΩ

3.3.5

VBAT_standby mode

The transition from active mode to VBAT_standby mode is initiated by an SPI command (STBY_SEL bit and

GO_STBY bit in CR2).

In VBAT_standby mode, the voltage regulators V1 and V2, the power outputs as well as LIN and CAN

transmitters are switched off.

An NReset pulse is generated and last asserted low upon wake-up from VBAT_standby mode and until 2ms after

LDO1 is fully operative.

3.4

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:

Table 7. Wake-up source

Wake-up source

Description

LIN bus activity

It can be disabled by SPI

CAN bus activity

It can be disabled by SPI

Level change of WU

It can be configured or disabled by SPI

IV1 > ICMP

The device remains in V1_standby mode but watchdog is enabled (if ICMP = 0).

No interrupt is generated

Timer interrupt/

wake-up of μC by TIMER

Programmable by SPI:

•

V1_standby mode:

device wakes up and interrupt signal is generated at NINT when programmable time-out has

elapsed

•

VBAT_standby mode:

device wakes up after programmable timer expiration. V1 regulator is turned on and NReset

signal is generated when programmable time-out has elapsed

SPI access

Always active (except in VBAT_standby mode)

Wake-up event: CSN falling edge

SPSB081

Wake-up from standby modes

DS14048 - Rev 3

page 16/137

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