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ATA6628 Datasheet(PDF) 17 Page - ATMEL Corporation |
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ATA6628 Datasheet(HTML) 17 Page - ATMEL Corporation |
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17 / 36 page  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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