Disable DC-DC 3.3v
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.
@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.
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.
livius last edited by livius
then it is another design bug?
jmarcelino last edited by
It's not possible, sorry. As you have found the microSD card slot is always powered.