OEM Modules (W01/L01/G01) Power Requirements
Two related questions about power. The spec sheets say 3.3V regulated input, but don't give much more detail.
- Is there any tolerance here at all (having some tolerance opens up more power supply options, especially when a primary battery is the power source)?
- What about in deep-sleep mode (can the modules operate at a lower voltage when sleeping)?
@Eric24 we will update the data sheets with more detailed info about operating ranges soon, but in the meantime, from 2.7 to 3.6 V is the recommended range. Same during deep sleep.
@Eric24 Unless the schematics are present, that is hard to tell. The ESP32 datasheet itself is a little bit vague, but as far as I can tell from it, it says:
Analog sections: 2.3 .. 3.6 V
Digital sections: 1.8 .. 3.3 V
It also talks about a VBat voltage in the range 2.8 .. 3.3 V, which is not mentioned anywhere else.
So, I would assume that the proper range is 2.8 .. 3.3V. You must not exceed 3.3V. Current consumption is about 250mA peak, and you need a low impedance power source.
If running from battery, like a Li-Ion one with a voltage range form 4.2 .. 2.8 V, you ought to use an external regulator, like for instance the Pololu S7V8F3 or S7V8A, which provide a stable output for an input range of 2.7 .. 11.8 V