ATA6629 Просмотр технического описания (PDF) - Atmel Corporation

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ATA6629

LIN Bus Transceiver with Integrated Voltage Regulator

Atmel Corporation 

ATA6629/ATA6631

A voltage less than the LIN Pre-wake detection VLINL at pin LIN activates the internal LIN

receiver and starts the wake-up detection timer.

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

period (tbus) and a following rising edge at pin LIN results in a remote wake-up request. The

device switches from Sleep Mode to Fail-safe Mode.

The VCC regulator is activated, and the internal LIN slave termination resistor is switched on. The

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

troller (Figure 4-5 on page 9).

EN high can be used to switch directly from Sleep/Silent to Fail-safe Mode. If EN is still high after

VCC ramp up and undervoltage reset time, the IC switches to Normal Mode.

Figure 4-5.

LIN Wake-up Diagram from Sleep Mode

Bus wake-up filtering time

tbus

Fail-safe Mode

Normal Mode

LIN bus

RXD

TXD

VCC

voltage

regulator

EN

NRES

Low or floating

Off state

Low or floating

Low

High

On state

Regulator wake-up time

EN High

Reset

time

Microcontroller

start-up time delay

9

9165B–AUTO–05/10

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