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Published 20 hours ago • verified publisher icon wemos

Lolin D1 mini Pro 2.0 - what is LDO_EN ?

Open marcobrianza opened this issue 6 years ago • 3 comments

What is the jumper labeled LDO_EN is supposed to do on this board https://wiki.wemos.cc/products:d1:d1_mini_pro ?

marcobrianza avatar Sep 27 '18 16:09 marcobrianza

See SJ2 under Power in the schematics. It’s normally not bridged and is so you can tie the EN pin to GND.

It’s the enable signal for the LDO regulator, active high.

Add a dab of solder to bridge the pads to disable the 5V regulator, so you can provide your own power source directly to the 3v3 and GND pins. Useful for battery operations.

mcauser avatar Sep 27 '18 21:09 mcauser

thank you @mcauser I will try it. Still the CH340C would be powered on by the +3V3

marcobrianza avatar Sep 29 '18 13:09 marcobrianza

You can wire a switch there, to turn the module on and off. It works perfectly. When off, it consumes 42 μΑ only. It's a pity this is not a proper connector.

vpapanik avatar Sep 21 '22 11:09 vpapanik