TLE7257

Functional Description

Data Sheet

12

Rev. 1.0, 2013-10-16

4.5

Bus Wake-up Event

Figure 8

Bus wake-up behavior

A bus wake-up event, also called remote wake-up, changes the operation mode from Sleep mode to Standby

mode. A falling edge on the LIN bus, followed by a “dominant” bus signal for the time

t

up event. The mode change to Standby mode becomes active with the following rising edge on the LIN bus. The

TLE7257 remains in Sleep mode until it detects a state change on the LIN bus from “dominant” to “recessive” (see

Figure 8).

In Standby mode a logical “low” signal on the RxD output indicates a bus wake-up event.

TLE7257_BUS_WAKE

TxD

INH: „high impedance“

V

BUS

V

BUS,wk

V

BUS,wk

LIN bus signal

INH

t

WK,bus

t

t

EN

t

TxD

t

RxD

t

RxD: „high“ because of the external pull-up to the microcontroller supply voltage

RxD: „low“ indicates bus

wake-up event

TxD

internal pull-up current source

Standby mode

Sleep mode