Datasheet

12

Rev. 1.20

2022-04-27

TLE7258

LIN transceiver

Functional description

3.5

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 tWK,bus results in a bus

wake-up event. The mode change to standby mode becomes active with the following rising edge on the LIN

bus. The TLE7258 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.

In case the TLE7258 detects a bus wake-up event while already being in standby mode after power-up, the

wake-up event will be signaled with a logical “low” level on RxD and override the power-on wake source (see

Figure 6).

TxD

1): „high impedance“

INH: „high impedance“

TLE7258_BUS_WAKE

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

1): „high“ because of

internal pull-up current source

1) In case the TxD input is open

Standby mode

Sleep mode