ATA6621 Ver la hoja de datos (PDF) - Atmel Corporation

Número de pieza

componentes Descripción

Fabricante

ATA6621

LIN Transceiver with 5V Regulator and Watchdog

Atmel Corporation 

Figure 3-3. LIN Wake-up Waveform Diagram (from Silent Mode)

Pre Normal Mode

LIN bus

Normal Mode

RXD

VCC

Voltage

Regulator

EN

High

Bus wake-up filtering time

Tbus

Silent Mode 5V/7%/50 mA

Low

High

Pre normal Mode 5V/50 mA

Normal Mode

5V/50 mA

Regulator Wake-up time

EN High

NRES If undervoltage, switch to Prenormal Mode

Undervoltage detection active

3.13.3

Sleep Mode

The falling edge at EN has to occure 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 on page 9). 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 ATA6621 supplies the microcontroller, wake-up from Sleep Mode is only possible via LIN or

pin WAKE.

8 ATA6621

4887D–AUTO–12/06

Share Link: