L99PM72PXP datasheet(19/128 Pages) STMICROELECTRONICS

19 / 128 page

L99PM72PXP

Detailed description

Doc ID 023553 Rev 3

19/128

A cyclic supply of external contacts and a synchronized monitoring of the contact state can

be activated and configured by SPI.

In V1_standby mode various wake-up sources can be individually programmed. Each wake-

up event puts the device into Active Mode and forces the RxDL/NINT pin to a low level

indicating the wake-up condition to the microcontroller.

After Power ON Reset (POR) all wake up sources are activated by default except the

periodic interrupt / wake timer.

With the interrupt timer the micro controller can be forced from 'stop' to 'run' after a

programmable period. The RxDL/NINT pin is forced low after the timer is elapsed. The

L99PM72PXP enters active mode and is awaiting a valid watchdog trigger.

Both internal timers can be used for this feature.

The interrupt timer (TINT) at pin RxDL/NINT is only available in V1_standby mode.

Note:

Inputs TxDL, TxDC must be at recessive (high) level and CSN must be at high level or at

high impedance in order to achieve minimum standby current in V1_standby Mode.

Inputs DI and CLK must be at GND or at high impedance to achieve minimum standby

current in V1_standby Mode.

2.2.5

Interrupt

The interrupt signal (linked to RxDL/NINT) indicates a wake-up event from V1_standby mode.

In case of a wake-up by Wake-up Inputs, activity on LIN or CAN, SPI access or Timer-

Interrupt the RxDL/NINT pin is pulled low for t = tinterrupt.

When CAN_ACT = 0 (during V1_standby Mode or Active Mode) a WUP (SW_EN = 0) or a

WUF (SW_EN = 1) generates an interrupt on RxDC/NINT to signalize CAN communication

on the bus to the µC.

In case of a CAN communication timeout an interrupt at RxDC /NINT is generated and the

CAN_TO flag is set.

In case of V1_standby mode and (IV1 >ICMP), the device remains in standby mode, the V1

regulator switches to high current mode and the watchdog starts. No Interrupt signal is

generated.

Table 3.

CAN wake-up signalization

Operating

mode

Event

Wake-up

transition to

active

Status flag

Interrupt

Transceiver

state

Active

WUP or WUF(1)

Not applicable

Wake_CAN WUP

WUP/WUF

RxDC

TRX_STBY

CAN timeout

CAN_TO

RxDC

TRX_STBY

V1_standby

WUP or WUF(1)

Yes

Wake_CAN WUP

WUP/WUF

RxDL

TRX_STBY

CAN timeout

CAN_TO

RxDC

TRX_STBY

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