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CC2640 lowest current when available of capacitive touch wakeup.?

Best
Prodigy 40 points
Other Parts Discussed in Thread: CC2640

In my application, I want to adopt the touch sensing as a system power on/off. Therefore, the CC2640 should be powered always. If the average current can under several uA, that's very good and suitable for system power on.

I'm happy to  find the CC2640  have a touch sensor up to 8 touch buttons.<- from on first page http://www.ti.com/lit/ds/symlink/cc2640.pdf . 

However, I can not find detail information about touch sensor. 

Please show us the informations about touch implementations,

1. touch button can wakeup the chip from "stand by mode" ?

2. if touch wake available, what's the current consumption during "stand by mode". 

3. please show me the any other information about touch sensor, I can not find helpful information to implement the touch sensor via CC2640.  

How can I implement touch button, How can I implement slider, How can I wakeup from the standby mode via touch,.. etc,.. 

thanks in advance.

  • 0
    TI__Guru** 106705 points
    Hi Best,

    We are working on a Capacitive touch DevPack for the SensorTag with a corresponding demo and reference SW. This will be available later this spring.

    Cheers,
    Fredrik
  • 0 in reply to Fredrik K
    Prodigy 40 points
    Hi Fredrick,

    Thanks for your work, we are looking forward to.

    However, now I should check if CC2640's toucsh sensor can be usef for system power on purpose.

    Please inform me about the current consumption during the state of touch wakeable standby mode.
  • 0 in reply to Best
    TI__Intellectual 1545 points
    Hi, Fredrick:
    What about the progress of Capacitive touch DevPack for the SensorTag development? My customer is looking forword. Already finish or still need to wait? Thanks! BTW, Has it contained fuction of Slider for cap touch?
    Vivian
  • 0 in reply to Vivian(MCU) Zhang
    TI__Guru** 106705 points
    Hi Vivian,

    This will probably not be available before after the summer.

    It will have buttons and a slider.

    Cheers,
    Fredrik
  • 0 in reply to Fredrik K
    TI__Intellectual 1545 points
    Hi Fredrik:
    Thanks for your quick reply. Looking forward as customer wants to PP before summer. Any ideal to help?
    Vivian
  • 0
    TI__Mastermind 29650 points
    Hi Best,

    Capacitive sensing on the CC26XX is partially software defined. This means the Sensor Controller will read in samples from the analog channels and you can do whatever you want with the samples using the sensor controller afterwards, for example wake up the Cortex M3.
    We have a non-TIRTOS sample project available in Sensor Controller Studio that will sample 5 channels and wake up the Cortex M3 when done.

    Typically how a capacitive sensing system will be implemented is to wake up the sensor controller periodically with the RTC to do one or more measurements of the channels. How often you wake up to do this will set your current level.
    If you for example measure 1 single channel 10x/second I expect you should be able to get below 1uA added in average.

    Regards,
    Svend