Forum Rule: Always post complete source code & details to reproduce any issue!
Results 1 to 2 of 2

Thread: Can I read the battery backup voltage (VBat) internally?

  1. #1
    Senior Member
    Join Date
    Nov 2012
    Location
    Chipping Norton, UK
    Posts
    274

    Can I read the battery backup voltage (VBat) internally?

    Hi, I wonder if anyone knows if I can read the VBat RTC clock battery backup voltage internally somehow or whether I would have to add an external voltage divider or similar to monitor the coin cell for low voltage? My current project is designed to use any Teensy from the following list depending on capability requirements:

    Teensy LC
    Teensy 3.0
    Teensy 3.1
    Teensy 3.2
    Teensy 3.5
    Teensy 3.6
    Teensy 4.0

    I realise that the Teensy LC does not have this capability i.e. battery backup for the RTC
    Last edited by Experimentalist; 10-16-2019 at 05:59 AM.

  2. #2
    Senior Member
    Join Date
    Nov 2012
    Location
    Chipping Norton, UK
    Posts
    274
    Quote Originally Posted by Experimentalist View Post
    . . . whether I would have to add an external voltage divider or similar . . .
    Having walked the dog and woken up a little I just thought that the coin cell is only 3V so no need for a voltage divider, I guess I can just connect it with a series resistor to limit current? I am still interested if this can be read internally somehow though?

Posting Permissions

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