I'm not sure, what the current consumption of the CP2102 is, when no USB is connected. In the datasheet it states:


enter image description here

And there is this USB pull-up specification. What does this mean? When no USB cable is connected, it draws around 200uA?

  • \$\begingroup\$ Did you read the footnote 3? \$\endgroup\$ – Justme Oct 13 '20 at 8:00
  • \$\begingroup\$ Ah i get it now, these currents are just from the pull-up. So the controller will always draw some decent amount. \$\endgroup\$ – HansPeterLoft Oct 13 '20 at 8:29
  • \$\begingroup\$ The pull-up current is not consumed if USB cable is disconnected. \$\endgroup\$ – Justme Oct 13 '20 at 8:55

I have found that the CP2102 doesn't always power down into suspend mode, so it draws 20mA even when the USB cable is disconnected.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.