ATA6616(2012) データシートの表示（PDF） - Atmel Corporation

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ATA6616
(Rev.:2012)

8K/16K Flash Microcontroller with LIN Transceiver, 5V Regulator and Watchdog

Atmel Corporation 

3.5 Wake-up Scenarios from Silent or Sleep Mode

3.5.1

Remote Wake-up via Dominant Bus State

A voltage lower than the LIN Pre_Wake detection VLINL at the LIN pin activates the internal LIN

receiver.

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

time period (> tBUS) and followed by a rising edge at pin LIN result in a remote wake-up

request. The device switches from Silent or Sleep Mode to Fail-safe Mode. The VCC voltage

regulator is/remains activated, the INH pin is switched to high, and the remote wake-up

request is indicated by a low level at the RXD pin to generate an interrupt for the microcon-

troller. A low level at the LIN pin in the Normal Mode starts the bus wake-up filtering time, and

if the IC is switched to Silent or Sleep Mode, it will receive a wake-up after a positive edge at

the LIN pin.

3.5.2

Local Wake-up via Pin WAKE

A falling edge at the WAKE pin followed by a low level maintained for a certain time period

(> tWAKE) results in a local wake-up request. The device switches to Fail-safe Mode. The local

wake-up request is indicated by a low level at the RXD pin to generate an interrupt in the

microcontroller and a strong pull down at TXD. When the WAKE pin is low, it is possible to

switch to Silent or Sleep Mode via pin EN. In this case, the wake-up signal has to be switched

to high > 10µs before the negative edge at WAKE starts a new local wake-up request.

3.5.3

Local Wake-up via Pin KL_15

A positive edge at pin KL_15 followed by a high voltage level for a certain time period (> tKL_15)

results in a local wake-up request. The device switches into the Fail-safe Mode. The extra long

wake-up time ensures that no transients at KL_15 create a wake-up. The local wake-up

request is indicated by a low level at the RXD pin to generate an interrupt for the microcon-

troller and a strong pull down at TXD. During high-level voltage at pin KL_15, it is possible to

switch to Silent or Sleep Mode via pin EN. In this case, the wake-up signal has to be switched

to low > 250µs before the positive edge at KL_15 starts a new local wake-up request. With

external RC combination, the time is even longer.

3.5.4

Wake-up Source Recognition

The device can distinguish between a local wake-up request (Wake or KL_15 pins) and a

remote wake-up request (via LIN bus). The wake-up source can be read on the TXD pin in

Fail-safe Mode. A high level indicates a remote wake-up request (weak pull up at the TXD

pin); a low level indicates a local wake-up request (strong pull down at the TXD pin). The

wake-up request flag (signalled on the RXD pin) as well as the wake-up source flag (signalled

on the TXD pin) is immediately reset if the microcontroller sets the EN pin to high (see Figure

3-3 on page 10 and Figure 3-4 on page 11) and the IC is in Normal Mode. The last wake-up

source flag is stored and signalled in Fail-safe Mode at the TXD pin.

14 Atmel ATA6616/ATA6617

9132F–AUTO–02/12

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