ATA6626 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6626

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

Atmel Corporation 

ATA6622/ATA6624/ATA6626

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 14). 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 or floating

Low

TXD

VCC

voltage

regulator

EN

NRES

Watchdog

Off state

Floating

Watchdog off

On state

Regulator wake-up time

Reset

time

EN High

Microcontroller

start-up time delay

Start watchdog lead time td

11

4986I–AUTO–07/10

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