ATA6621N-PGPW(2007) 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6621N-PGPW
(Rev.:2007)

LIN Transceiver with 5V Regulator and Watchdog

Atmel Corporation 

ATA6621N

3.15.3

Sleep Mode

The falling edge at EN has to occur not more than tDOMmin = 6 ms after or 3.2 µs before the fall-

ing edge at TXD in order to switch the IC into Sleep mode. The TXD Signal has to stay logic low

during the Mode Select window (Figure 3-4). See also section “Silent Mode” on page 6.

In Sleep mode the transmission path is disabled. Supply current from VBat is typically

IVSsleep = 10 µA. The VCC regulator is switched off. NRES and RXD are low. The internal slave

termination between pin LIN and pin VS is disabled to minimize the power dissipation in case pin

LIN is shorted to GND. Only a weak pull-up current (typically 10 µA) between pin LIN and pin VS

is present.

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

(tbus) results in a remote wake-up request. The device switches from Sleep mode to Pre-normal

mode. The VCC regulator is activated and the internal LIN slave termination resistor is switched

on. The remote wake-up request is indicated by a low level at pin RXD to interrupt the microcon-

troller. (Figure 3-5 on page 10)

With EN high you can switch directly from Silent mode to Normal mode. In the application where

the ATA6621N supplies the microcontroller, wake-up from Sleep mode is only possible via LIN

or pin WAKE.

If the device is switched into Sleep mode, VCC ramps down without generating an undervoltage

reset at pin NRES.

Figure 3-4. Switch to Sleep Mode

Sleep Mode

EN

TXD

NRES

Mode Select window

td = 3.2 µs

VCC

LIN

Delay time Sleep Mode

td_sleep = maximum 15 µs

LIN switches directly to recessive mode

9

4887H–AUTO–12/07

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