L80-M39 supply on V_BCKP

Hi, does supplying V_BCKP of a L80-M39 could result in voltage output on Vcc, Rx or Tx Pins?

Hi Tomy983,

Yes. If you supply V_BCKP only on a L80-M39, TX and RX voltage will be high voltage output. But VCC won’t be high without a voltage input. Because VCC is an input pin.

Best regards.