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TCA8424 Set_Power command support

Jerry Shih
Prodigy 20 points
Other Parts Discussed in Thread: TCA8424

Hi,

I tried to send Set_Power OFF command to TCA8424 follow HID Over I2C Protocol V1.00 but the power consumption of TCA8424 didn't reduce. Will TCA8424 enter suspend after receiving Set_Power OFF command?

BR,

Jerry

  • 0
    TI__Expert 6430 points

    The moderator of the I2C forum is out of the office for the U.S. holidays. Please expect your question to be addressed on January 2nd

    Thanks

  • 0
    TI__Mastermind 30260 points

    How did you acquire TCA8424 samples? Through the TI Store or directly from a TI Sales team member?

    Have you also ordered/received the TCA8424EVM?

    If so, have you already performed OTP programming?

    If not, are you aware that you will need to program the OTP of each device?

    Just trying to understand your level of support with this device to date, and your understanding of its implementation.

  • 0 in reply to Brian Berner
    Prodigy 20 points

    Hi,

    We purchased TCA8424EVM from Digikey and have programmed OTP. Will TCA8424 enter low power mode or just turn off LED after receiving Set_Power OFF command? We observed the current doesn't change at Set_Power ON and OFF state.

    BR,

    Jerry

  • 0 in reply to Jerry Shih
    TI__Mastermind 30260 points
    "Set_Power" OFF turns OFF the LEDs and remembers their state.
    "Set_Power" ON turns ON the LEDs in the previously recorded state.

    So, the overall system's current consumption will be reduced, but the current consumed by the TCA8424 will not be reduced. In the state, key-scan must continue, so the only option for saving power is by turning off the LEDs when the keyboard is in "sleep mode", or "low power mode", or whatever you may want to call it.