ATA6628 Ver la hoja de datos (PDF) - Atmel Corporation

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ATA6628

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

Atmel Corporation 

5. Wake-up Scenarios from Silent or Sleep Mode

5.1 Remote Wake-up via Dominant Bus State

A voltage less than the LIN Pre_Wake detection VLINL at the LIN pin 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 VBUSdom maintained for a certain time period (> tBUS) and a

rising edge at pin LIN result in a remote wake-up request. A remote wake-up from Silent Mode is only possible if TXD is high.

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 internal slave termination resistor is switched on. The remote wake-up request is indicated by

a low level at the RXD pin to generate an interrupt for the microcontroller and a strong pull down at TXD.

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 internal slave termination resistor is switched on. The local wake-up

request is indicated by a low level at the TXD pin to generate an interrupt for the microcontroller. 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.

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 internal slave termination resistor is switched on. 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 TXD pin to generate an interrupt for the microcontroller. 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 an external RC combination, the time can be increased.

5.4 Wake-up Source Recognition

The device can distinguish between different wake-up sources (see Table 4-4 on page 14).

The wake-up source can be read on the TXD and RXD pin in Fail-safe Mode. These flags are immediately reset if the

microcontroller sets the EN pin to high (see Figure 4-3 on page 9 and Figure 4-5 on page 11) and the IC is in Normal mode.

16 ATA6628/ATA6630 [DATASHEET]

9117I–AUTO–10/14

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