1 Reply Latest reply on May 17, 2020 5:43 PM by XiaoweiZ_71

    UART Wake up from deep sleep

    long_4668236

      Hi all,

      I use Psoc 4100S Plus CY8C4147AZI

      I am using uart wake up from deep sleep, when i connect RX with TX FTDI FT232RL USB to serial, the current consumption is 3uA. When i disconnect RX (floating) with TX USB to serial, the current consumption is 2.5mA.

      Could you show my mistake?

        • 1. Re: UART Wake up from deep sleep
          XiaoweiZ_71

          The drive mode of uart rx pin is 'digital high-z'. With this drive mode, the input impedance of uart rx pin is >100M Ohm, so it is very easy to couple external noise and trigger silicon wakeup frequently. 

           

          Any digital high-z pin should not be floated if port interrupt is enabled on this pin.