ATA6624(2008) 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6624
(Rev.:2008)

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

Atmel Corporation 

ATA6622/ATA6624/ATA6626

Figure 4-3.

LIN Wake Up from Silent Mode

Bus wake-up filtering time

tbus

LIN bus

Node in silent mode

RXD

High

Fail-safe mode

Low

Normal mode

High

TXD

Watchdog

VCC

voltage

regulator

EN

Watchdog off

Silent mode 3.3V/5V/50 mA

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). The transmission path is

disabled in Sleep Mode. The supply current IVSsleep from VBatt is typically 10 µA.

The VCC regulator is switched off. NRES and RXD are low. The internal slave termination

between the LIN pin and VS pin is disabled to minimize the power dissipation in the event that

the LIN pin is short-circuited to GND. Only a weak pull-up current (typically 10 µA) between the

LIN pin and the VS pin is present. Sleep Mode can be activated independently from the current

level on the LIN, WAKE, or KL_15 pin.

A voltage less than the LIN Pre_Wake detection VLINL at the LIN pin activates the internal LIN

receiver.

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

period (tbus) and a rising edge at pin LIN respectively result in a remote wake-up request. The

device switches from Sleep Mode to Fail-safe Mode.

9

4986F–AUTO–07/08

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