Isolate uart of two MCu

Discussion in 'Embedded Systems and Microcontrollers' started by aamirali, Jul 28, 2014.

  1. aamirali

    Thread Starter Member

    Feb 2, 2012
    415
    1
    I have to isloate uart of two MCU with the help of optocoupler.
    I have made a circuit which I had attached.

    is it the correct way to do?
    For me its looks ok.
     
    • ckt.pdf
      File size:
      23.5 KB
      Views:
      43
  2. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,504
    380
    Hi,
    The signal polarity looks OK.
    The 1K's are too high in value, I would suggest 270R or 330R in order to get a fast/hard switch On of the Emitter LED's.

    E
     
  3. Shagas

    Active Member

    May 13, 2013
    802
    74
    Looks good. What baud rate are you planning on using ? If it's high then I suggest you check out the datasheet of the optocoupler to make sure that it has fast enough rise/fall times because last optocoupler that I worked with was pretty slow. This could (potentially) be a problem to you but most likely not.
     
Loading...