ATA6617 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6617

Microcontroller with LIN Transceiver, 5V Regulator and Watchdog

Atmel Corporation 

3.4.2

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 3-3 on page 10). The transmission

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

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

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

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

(typically 10µA) 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 con-

dition 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 3-3. Switch to Silent Mode

Normal Mode

Silent Mode

EN

TXD

NRES

Mode select window

td = 3.2µs

VCC

Delay time silent mode

td_silent = maximum 20µs

LIN

LIN switches directly to recessive mode

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

period (tbus) and followed by rising edge at the LIN pin (see Figure 3-4 on page 11) results in a

remote wake-up request. The device switches from Silent Mode to Fail-safe Mode. The

remote wake-up request is indicated by a low level at the RXD pin to interrupt the microcon-

troller (see Figure 3-4 on page 11). EN high can be used to switch directly to Normal Mode.

10 Atmel ATA6616/ATA6617

9132D–AUTO–12/10

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