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CC2541: CC2541 PM3 mode waking up

Robin Zhou
Intellectual 625 points
Part Number: CC2541
Other Parts Discussed in Thread: CC2540

Dear Engineers~

There is a question about CC2541:
After connecting the CC2541 to the mobile phone, set the PM3 mode (turn off all timers and test the power consumption to 1uA).
After that, I waking up again and then restarting the broadcast event "osal_set_event( simpleBLEPeripheral_TaskID, SBP_START_DEVICE_EVT );", but found that it took a long time for the broadcast to be searched by the mobile phone.
Could you please provide some solution?

Thank you for your support~

  • 0
    TI__Guru 56590 points
    Hello Robin,
    How long is a long time?
    Are you using the latest released stack?

    Refer to Bug Fixes: for Version 1.3.1 April 18, 2013 (CC2540 and CC2541 Bluetooth® low energy Software Developer’s Reference Guide):
    Upon Power-On Reset or after wake-up from PM3, a 400ms delay has been implemented, during
    which time the CC254x will not go into PM2 sleep. This allows time for the 32kHz crystal to stabilize.
    Previously, in rare cases with certain hardware configurations the CC254x could have timing issues
    due to the crystal not having time to stabilize.

    And this thread:
    e2e.ti.com/.../380450

    Could this relate to your issue?