I have a 3.3V buck regulator in my project along with a StemmaQt module. It would be much more convenient to just attach the regulator output to the module and let it power the Badger over the StemmaQt cable. Would this work? Would it cause any damage?
Someone in a group I’m in checked the schematic and said it looks like you can.
I couldn’t find a clear answer already posted, so hopefully this helps someone in the future.
You would loose I2C and also one of the core function of the buttons: they can’t turn on the device anymore. And these buttons are pulled high by design, so you would also need to use internal pullups once the system is up. Which is simple, but you will have to write your own code for that.
You would also loose the short-circuit and over-current protection of the internal LDO. So you have to make sure your regulator will provide that.
And I don’t understand the reasoning: why not just attach the regulator output to the JST-PH2 “battery” connector?