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    Explore Pybytes | Official Documentation | Report a Firmware Bug/Issue | GitHub

    Disable DC-DC 3.3v

    Scheduled Pinned Locked Moved WiPy 2&3
    deepsleepsd carddc-dccurrent drain
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    • R Offline
      Roqueton
      last edited by

      Is it possible to disable the 3.3v regulator during deepsleep mode?. I have a current drain when a microSD is inserted and deepsleep mode is activated (around 5mA), because it is powered by 3.3v pin. If the SD is removed, the current drain stops (20uA).

      I am using a Wipy3 with lastest firmware and expansion board 2.1.
      Any ideas?

      J 1 Reply Last reply Reply Quote 0
      • J Offline
        jmarcelino @Roqueton
        last edited by

        @roqueton
        It's not possible, sorry. As you have found the microSD card slot is always powered.

        L 1 Reply Last reply Reply Quote 0
        • L Offline
          livius @jmarcelino
          last edited by livius

          then it is another design bug?

          think about people first, then computers

          G 1 Reply Last reply Reply Quote 2
          • R Offline
            Roqueton
            last edited by

            Thanks for the information.

            However, in my opinion, the control of the 3.3V Dc pin should be a important feature included in the Pycom device. My design sources several sensors using the 3.3V and, obviously, the current drained in deep sleep mode makes difficult the power autonomy.

            I have shorcutted the problem using a PNP transistor BCW68 and a 3,9K resistor in its base. It is controlled by a GPIO Pin. The emissor Pin goes to the WiPy 3.3v Pin and collector Pin is connected to the sensors and the SD card.

            1 Reply Last reply Reply Quote 0
            • G Offline
              gregcope @livius
              last edited by

              @livius Agreed. I was going to use an SD Card to store config, state and logs, but now my device is no longer low power...

              Seems a bit off when you can switch all (that I know of) bit off.

              1 Reply Last reply Reply Quote 0

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