ATA6621N 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6621N

LIN Transceiver with 5V Regulator and Watchdog

Atmel Corporation 

ATA6621N

The overall supply current from VBat is the addition of 40 µA plus the VCC regulator output current

IVCCs.

In Silent mode, the 5V regulator is in low tolerance mode (4.65V to 5.35V) and can source up to

50 mA. The internal slave termination between pin LIN and pin VS is disabled to minimize the

power dissipation in case pin LIN is shorted to GND. Only a weak pull-up current (typically

10 µA) between pin LIN and pin VS is present.

The Silent mode voltage tolerance is sufficient to run the internal timers of the microcontroller.

The undervoltage reset is now VccthS < 4.4V. If an undervoltage condition occurs, the NRES is

switched to low and the ATA6621N changes state to Pre-normal mode.

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 Silent mode to Pre-normal

mode. 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 microcontroller (see Figure 3-3 on page 8).

With EN high, you can switch directly from Silent mode to Normal mode.

Figure 3-2. Switch to Silent Mode

Silent Mode

EN

TXD

NRES

Mode Select window

td = 3.2 µs

VCC

LIN

Delay time Silent Mode

td_sleep = maximum 15 µs

LIN switches directly to recessive mode

7

4887I–AUTO–09/09

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