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ATA6631-TAPY

LIN Bus Transceiver with Integrated Voltage Regulator

Atmel Corporation 

ATA6629/ATA6631

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/silent

+ ILINwake

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 (VCC = 3.3V/5V/2%/50 mA) (see Figure 6-1 on page 14). The NRES output

switches to low for tres = 4 ms 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 functional-

ity of these Modes is described in Table 4-2.

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

Different Modes

TXD

RXD

Fail-safe Mode

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

Normal Mode

Follows data transmission

Silent and Sleep Mode

High

High

11

9165B–AUTO–05/10

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