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CC2541 wakeup from power save mode via UART

Yohannes Tesfai
Prodigy 170 points
Other Parts Discussed in Thread: CC2541

Hi,

Is there a way to wake the CC2541 from low power mode using UART activity without using another GPIO for wakeup interrupt. It would be better if the wake can happen just using RX activity but if we have to use flow control pins to achieve that is fine too. If so what is the lowest power mode I can use and still be able to wake it up just using UART activity?

On a similar note, do you know of a document/table that shows the different low power modes, their average current consumption and all available wakeup methods from that low power mode?

Thanks
Yohannes

  • 0
    Intellectual 805 points

    Yes, the RX pin alone, even configured for UART, will provide a wakeup from PM3, your problem will be that the crystal takes time to powerup to provide the correct baud rate clock, so your UART protocol packets will require either a pre-amble of garbage bytes to provide for this crystal latency or a handshake.

    The data sheet and user's guide answer all of your other questions:

    http://www.ti.com/lit/gpn/cc2541