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ATA6628 Datasheet(PDF) 17 Page - ATMEL Corporation

Part No. ATA6628
Description  Negative Trigger Input for Watchdog
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATA6628 Datasheet(HTML) 17 Page - ATMEL Corporation

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17
9117E–AUTO–07/10
ATA6628/ATA6630 [Preliminary]
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 V
LINL 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 V
BUSdom maintained for a certain
time period (t
BUS) 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
(t
WAKE) 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 > 10 µs 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 (> t
KL_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 > 250 µs before the positive edge at KL_15 starts a new local wake-up request.
With external RC combination, the time is even longer.
5.4
Wake-up Source Recognition
The device can distinguish between different wake-up sources (see Table 4-4 on page 15).
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 10 and
Figure 4-5 on page 12) and the IC is in Normal mode.


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