18.3.3 Wake-up Source Recognition
The device can distinguish between different wake-up sources. The wake-up source can be read on the LIN_TXD and LIN_RXD pins in Fail-Safe mode, according to Table 17-3, if an external pull-up resistor (typically 5 kW) has been added on pin LIN_TXD to the power supply of the microcontroller. These flags are reset immediately if the microcontroller sets pin LIN_EN to high and the IC is in Normal mode.
| Fail-Safe Sources | LIN_TXD(1) | LIN_RXD |
|---|---|---|
LIN Wake-up (LIN_BUS pin) | Low | Low |
Local Wake-up (LIN_WKIN pin) | Low | High |
VSth (battery) Undervoltage Detection (VS < 3.9V) | High | Low |
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Note:
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