ATA6629-TAPY 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6629-TAPY

LIN Bus Transceiver with Integrated Voltage Regulator

Atmel Corporation 

4.1 Normal Mode

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

specification 2.x. The VCC voltage regulator operates with a 3.3V/5V output voltage, with a low

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 4-3 on page 7). The transmission path is

disabled in Silent Mode. The overall supply current from VBatt is a combination of the

IVSsi = 40 µA plus the VCC regulator output current IVCCs.

Figure 4-2. Switch to Silent Mode

Normal Mode

Silent Mode

EN

TXD

NRES

Mode select window

td = 3.2 µs

VCC

Delay time silent mode

td_silent = maximum 20 µs

LIN

LIN switches directly to recessive mode

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 to minimize the current consumption 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. 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 ATA6629/ATA6631

changes its state to Fail-safe Mode.

6 ATA6629/ATA6631

9165B–AUTO–05/10

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