ATA6631(2014) 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6631
(Rev.:2014)

LIN Bus Transceiver with Integrated Voltage Regulator

Atmel Corporation 

Figure 4-7. Short Circuit to GND on the LIN bus During Sleep- or Silent Mode

LIN BUS

VLINL

VBUSdom

IVS

IVSsleep/silent

LIN Pre-wake

LIN dominant state

tmon

tmon

IVSfail

IVSsleep_short/

IVSsilent_short

Mode of

operation

Sleep/Silent Mode

Int. Pull-up

Resistor

RLIN

Wake-up Detection Phase Sleep/Silent

Mode

off (disabled)

Fail-Safe Mode

on (enabled)

4.5 Fail-safe Mode

The device automatically switches to fail-safe mode at system power-up. The voltage regulator is switched on

(see Figure 6-1 on page 15). The NRES output switches to low for tres = 4ms and gives a reset to the microcontroller. LIN

communication is switched off. The IC stays in this mode until EN is switched to high. The IC then changes to normal mode.

A power down of VBatt (VS < VSth) during silent or sleep mode switches the IC into fail-safe mode after power up. A low at

NRES switches the IC into fail-safe mode directly. During fail-safe mode the TXD pin is an output and signals the fail-safe

source.

The LIN SBC can operate in different modes, like normal, silent or sleep mode. The functionality of these modes is described

in Table 4-2.

Table 4-2. TXD, RXD Depending from Operation Modes

Different Modes

Fail-safe Mode

Normal Mode

Silent Mode

Sleep Mode

TXD

RXD

Signalling fail-safe sources (see Table 4-3)

Follows data transmission

High

High

Low

Low

12 ATA6629/ATA6631 [DATASHEET]

9165F–AUTO–10/14

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