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CC2640 SCE operation in Standby Mode

LLouis
Expert 3515 points
Other Parts Discussed in Thread: CC2640

Hi,

I would like to check on the question: "Would SCE able to run program in Standby mode"? As i see the current for standby mode is around ~1uA and in the user guide, it states " Sensor controller is available in autonomous mode when the CC26xx device is in standby mode."

So, i think in standby mode, SCE is not able to run programs? It just keep the functionality of retain RAM data and the ability to wake up on interrupts to see if enter IDLD Mode? 

Thanks!

cc2541 OAD using external flash

  • 0
    TI__Mastermind 29650 points
    Hi Louis,

    The Sensor Controller is able to wake up and run programs even when in standby. This can happen using the RTC, a AUX timer or a pin interrupt. However we support only for the Sensor Controller to run at 24MHz so the supply system and high-speed oscillator will be turned on while the Sensor Controller is running. Current draw will still be significantly lower compared to waking up the system CPU.

    Regards,
    Svend
  • 0 in reply to svendbt
    TI__Expert 3515 points

    Hi Svend,

    Thanks for your reply. From your description, if the SCE runs in standby, it would be similiar in the IDLE State? Right?

    Because from the cc2640 datasheet, Table 6-2. Power Modes, the high-speed clock and peripherals are off in standby state.

    So if we need SCE to run, we could better to go for Idle mode and not wake up the main CPU?

    Thanks and looking forward for your comments.

  • 0 in reply to LLouis
    TI__Mastermind 29650 points
    Hi Louis,

    In Idle mode the MCU domain is also powered on so the current draw in Idle is close to what you would get with the SC running but not exactly the same (~700uA I think).
    This would only be drawn while the SC is running. Once it is done with its tasks the system would go back to Standby drawing 1uA.

    Svend
  • 0 in reply to svendbt
    TI__Expert 3515 points
    Svend,Thanks for your response. Actually, i have two understanding:
    1. SC is running independently from the M3. So Idld/Standby actually don't refer to the SC? 2
    2. SC is running independently from the M3. But it have itself power state like Idle and Standby, which could be differnent from the M3.
    Is the 2nd right?
    And one last question is that, in Standby, could SC use the M3 peripherals like SPI/ADC etc..? I would have a try then.
    Thanks again!
  • 0 in reply to LLouis
    TI__Mastermind 29650 points
    Hi Louis,

    The system will be in Standby when both the SC and M3 are not running. Regarding #2 "Idle" is more related to the MCU side so when only the SC is running the system will be in a mode almost equal to "Idle" but the MCU domain will not be on.

    The Sensor Controller can use the ADC and other peripherals in the AUX domain. I suggest downloading Sensor Controller Studio to see what you can do in the SC.

    Regards,
    Svend