ON/OFF button for PIC16f877a (ambiguity)

Results 1 to 12 of 12

Threaded View

  1. - 22nd August 2012, 18:30 #5
    HenrikOlsson's Avatar
    HenrikOlsson
    HenrikOlsson is offline Contributor
    Join Date
    Oct 2005
    Location
    Sweden
    Posts
    3,612

    Did you find this post helpful? Yes | No

    Default Re: ON/OFF button for PIC16f877a (ambiguity)

    Hi,
    When there's no power applied to the Vdd rail of the uC driving its pins may result in the protective diode between the input and Vdd to conduct and start "feeding" the uC internally so to speak. You have 64k in series with that possible "feed" so it's unlikely it will actually work but it might try to start up and that can perhaps make it do some weird things. I'd proably turn off power to any circuitry that's interfaces TO the uC as well as the uC itself.

    EDIT: On a second look I see that you have the output the AD620 directly connected to a pin on the uC, if it can supply enough current then you could be in trouble.

    /Henrik.
    Last edited by HenrikOlsson; - 22nd August 2012 at 18:36.
« Previous Thread | Next Thread »

Members who have read this thread : 1

You do not have permission to view the list of names.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Forum Rules