Connect with us

Maximum voltage on PIC I/O line

Discussion in 'Microcontrollers, Programming and IoT' started by Rajinder, May 30, 2018.

  1. Rajinder

    Rajinder

    335
    6
    Jan 30, 2016
    Hi all
    I wanted to ask what is the maximum negative and positive voltage i can apply to the PIC I/O line when configured as an input.
    I think it is VDD + 0.3V and VSS-0.3V

    The PIC has input protection diodes. So my question is can i go beyond these limits? Say i had 3.6V and -0.6V. Would the diodes not conduct and prevent damage to the PIC. I presume that there will also be a current limit of the diode that i cant exceed? I am using a PIC16F1938.

    Thanks in advance
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    8,830
    1,741
    Nov 17, 2011
    They will conduct and forward energy from the I/O pin to teh supply rail of the PIC with possibly desastrous side effects for the PIC.
    The datasheet specifies a clamp current of 20 mA for this case. As long as your input current is limited to 20 mA or less, a slight overvoltage on the input pin will be tolerated by the chip.

    Have a look at this thread.
     
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Similar Threads
There are no similar threads yet.
Loading...
Electronics Point Logo
Continue to site
Quote of the day

-