ESP8266 Community Forum

According to the specs, the CP2104 USB chip on a Wemos D1 Mini drains 18mA when active and only 200μa when disabled.
Is it possible to disable that chip by software?

maybe from the USB side but surely not from the serial side (the one exposed to the esp).

generally on all "integrated" boards:
This would not be problematic if it were implemented as "bus powered" but most boards are idiotically implemented as selfpowered; who needs the part powered when not connected to usb???

schufti wrote:maybe from the USB side but surely not from the serial side (the one exposed to the esp).

generally on all "integrated" boards:
This would not be problematic if it were implemented as "bus powered" but most boards are idiotically implemented as selfpowered; who needs the part powered when not connected to usb???

How do one do that: implement as "bus powered" vs. "implement as selfpowered"?

If they are implemented as selfpowered, isn't it useful to use
Serial.stop();
?
and set the TX GPIO to "0";

I don't know if they have some intelligence to detect "no traffic" to enter some standby mode, I doubt it. In the silab datasheets (current and old parts) I only find information to supply current - normal vs suspended and by "suspended" referring to the USB bus.