Hey Shengyue, Is the device the customer is working with G3507 or L1105? As for the UART, are they disabling the UART when they go to low power mode? From the description, my understanding is that having the UART RX low will look like a start bit and transactions causing the UART module to wake. If the UART is being disabled, then this obviously won't happen. Based on your description of the customer's setup, I would suggest either using a different source for the pull--up or disable the UART when the pull-up power is removed and re-enabled when it's back. (maybe using another GPIO to detect? ) Thanks, JD
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