ATA6622C(2014) データシートの表示（PDF） - Atmel Corporation

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ATA6622C
(Rev.:2014)

LIN Bus Transceiver with 3.3V (5V) Regulator and Watchdog

Atmel Corporation 

4.4 Fail-safe Mode

The device automatically switches to Fail-safe Mode at system power-up. The voltage regulator is switched on (see Figure

5-1 on page 13). 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 < 3.7V) during Silent or Sleep Mode switches the IC into Fail-safe Mode after power up. A low at NRES switches

into Fail-safe Mode directly. During Fail-safe Mode the TXD pin is an output and signals the last wake-up source.

4.5 Unpowered Mode

If you connect battery voltage to the application circuit, the voltage at the VS pin increases according to the block capacitor

(see Figure 5-1 on page 13). After VS is higher than the VS undervoltage threshold VSth, the IC mode changes from

Unpowered Mode to Fail-safe Mode. The VCC output voltage reaches its nominal value after tVCC. This time, tVCC, depends

on the VCC capacitor and the load.

The NRES is low for the reset time delay treset. During this time, treset, no mode change is possible.

Figure 4-5. LIN Wake Up from Sleep Mode

Bus wake-up filtering time

tbus

Fail-safe Mode

Normal Mode

LIN bus

RXD

Low

Low

TXD

VCC

voltage

regulator

EN

NRES

Watchdog

Off state

Low

Watchdog off

On state

Regulator wake-up time

Reset

time

EN High

Microcontroller

start-up time delay

Start watchdog lead time td

ATA6622C/ATA6624C/ATA6626C [DATASHEET]

11

4986O–AUTO–10/14

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