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MSP430FR2512: About Wake on touch

U-SK
Genius 5840 points
Part Number: MSP430FR2512


Hello.

I would like to implement three touch buttons of mutual capacitance technology using MSP430FR2512

And I want one touch button to function as a Wake on touch button

I would like to activate the CPU by pressing the Wake on touch button and then activate the other two buttons.

Is the above possible?
Are there any concerns?

With the above application, when I want to make the button space as narrow as possible, is the mutual capacity method the best?

Regards,

U-SK

  • 0
    TI__Mastermind 39730 points
    Hi U-SK

    It is possible to wake up the CPU by the guard channel. Due to the MSP430FR2512 have 4 Captivate channel you can use a channel specified to guard channel and the other three as the buttons. For the guard channel you should make it big and use the self mode. For more information you can refer to the design guide(software-dl.ti.com/.../index.html) Design Guide->Proximity
    For the aarrow buttons, it is better to use mutual mode.
  • 0 in reply to Gary Gao
    Genius 5840 points
    Hi Gary Gao,

    Thank you for your reply.
    Sorry to typo.
    I wold like to use a channel specified to wake on touch button and the other two as the usual buttons.
    And I wold like to use all three buttons as mutual.

    Why shold wake on touch be used as self?
    Can't I use wake on touch as mutual?

    Regards,

    U-SK
  • 0 in reply to U-SK
    TI__Mastermind 39730 points
    Hi U-SK

    Use self mode for wake on touch you can get a long distance for sensing. You can use the mutual mode and the button for the wake on touch, but the distance for the sensing will be short.

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