ATA6622 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6622

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

Atmel Corporation 

ATA6622/ATA6624/ATA6626

A falling edge at the LIN pin followed by a dominant bus level maintained for a certain time

period (tbus) and the following rising edge at the LIN pin (see Figure 4-3 on page 9) results in a

remote wake-up request. The device switches from Silent Mode to Fail-safe Mode. The remote

wake-up request is indicated by a low level at the RXD pin to interrupt the microcontroller (see

Figure 4-3 on page 9). EN high can be used to switch directly to Normal Mode.

Figure 4-3. LIN Wake Up from Silent Mode

Bus wake-up filtering time

tbus

Fail-safe mode

Normal mode

LIN bus

Node in silent mode

RXD

High

Low

High

TXD

Watchdog

Watchdog off

VCC

voltage

regulator

Silent mode 3.3V/5V/50 mA

EN

Start watchdog lead time td

Fail safe mode 3.3V/5V/50 mA Normal mode

EN High

NRES

Undervoltage detection active

4.3 Sleep Mode

A falling edge at EN when TXD is low switches the IC into Sleep Mode. The TXD Signal has to

be logic low during the Mode Select window (Figure 4-4 on page 10). In order to avoid any

influence to the LIN-pin during switching into sleep mode it is possible to switch the EN up to

3.2 µs earlier to LOW than the TXD. Therefore, the best and easiest way are two falling edges at

TXD and EN at the same time.The transmission path is disabled in Sleep Mode. The supply

current IVSsleep from VBatt is typically 10 µA.

9

4986I–AUTO–07/10

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