6

4957H–AUTO–05/10

ATA6623/ATA6625

4.1

Normal Mode

This is the normal transmitting and receiving Mode of the LIN Interface, in accordance with LIN

specification 2.x. The V

tolerance of ±2% and a maximum output current of 50 mA.

If an undervoltage condition occurs, NRES is switched to low and the IC changes its state to

Fail-safe Mode.

4.2

Silent Mode

A falling edge at EN while TXD is high switches the IC into Silent Mode. The TXD Signal has to

be logic high during the Mode Select window (Figure 4-2 on page 7). The transmission path is

disabled in Silent Mode. The overall supply current from V

I

The 3.3V/5V regulator with 2% tolerance can source up to 50 mA. In Silent Mode the internal

slave termination between pin LIN and pin VS is disabled, and only a weak pull-up current (typi-

cally 10 µA) between pin LIN and pin VS is present. The Silent Mode can be activated

independently from the current level on pin LIN.

If an undervoltage condition occurs, NRES is switched to low and the IC changes its state to

Fail-safe Mode.

A voltage less than the LIN Pre-wake detection V

receiver and switches on the internal slave termination between the LIN pin and the VS pin.

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

period (t

remote wake-up request.

The device switches from Silent Mode to Fail-safe Mode, and the remote wake-up request is

indicated by a low level at pin RXD to interrupt the microcontroller (Figure 4-3 on page 7). EN

high can be used to switch directly to Normal Mode.