ATA6620N データシートの表示（PDF） - Atmel Corporation

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ATA6620N

LIN Bus Transceiver with Integrated Voltage Regulator

Atmel Corporation 

4.2.2

Sleep Mode

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

be logic low during the Mode Select window (see Figure 4-4). We recommend using the same

microcontroller port for EN as for TXD; in this case the mode change is only one command.

In Sleep mode the transmission path is disabled. Supply current from VBatt 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 short-circuited 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 and a high level at pin TXD (see Figure 4-5 on page 9).

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

ATA6620N supplies the microcontroller, the wake-up from Sleep mode is only possible via pin

LIN.

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

reset at pin NRES.

Figure 4-4. Switch to Sleep Mode

Normal Mode

Sleep Mode

EN

TXD

NRES

Mode select window

td = 3.2 µs

VCC

Delay time sleep mode

LIN

td_sleep = maximum 20 µs

LIN switches directly to recessive mode

8 ATA6620N

4850I–AUTO–09/09

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