ATA6626 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6626

LIN Bus Transceiver with 3.3V (5V) Regulator and Watchdog

Atmel Corporation 

4.1 Normal Mode

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

LIN specification LIN 2.x. The voltage regulator is active and can source up to 50 mA. The

undervoltage detection is activated. The watchdog needs a trigger signal from NTRIG to avoid

resets at NRES. If NRES is switched to low, the IC changes its state to Fail-safe Mode.

4.2 Silent Mode

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

be logic high during the Mode Select window (see Figure 4-2 on page 8). The transmission path

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

IVSsi = 57 µA plus the VCC regulator output current IVCC.

The 3.3V/5V regulator with 2% tolerance can source up to 50 mA. The internal slave termination

between the LIN pin and the VS pin is disabled in Silent Mode, only a weak pull-up current

(typically 10 µA) between the LIN pin and the VS pin is present. Silent Mode can be activated

independently from the actual level on the LIN, WAKE, or KL_15 pins.

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 VLINL at the LIN pin activates the internal LIN

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

Figure 4-2. Switch to Silent Mode

Normal Mode

EN

Silent Mode

TXD

NRES

VCC

LIN

Mode select window

td = 3.2 µs

Delay time silent mode

td_silent = maximum 20 µs

LIN switches directly to recessive mode

8 ATA6622/ATA6624/ATA6626

4986I–AUTO–07/10

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