• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 30 subscribers
  • Views 606 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

vddc pin tm4c129ncpdt controller

sanjay kumar3
Intellectual 530 points

Hi Frnds

can someone plz tell me what is the significance of "vddc" in tm4c129ncpdt microcontroller i.e. while making circuit diagram if i have to connect it to external 3.3v power supply or not. if not then why this pin is given on controller.

  • 0
    TI__Guru**** 244400 points
    Hello Sanjay

    The VDDC is the Core LDO voltage pin. It is is 1.2V which is sourced by the TM4C device and "must" have a capacitor in the range of 2.5uF-4.5uF. It must not be connected to the 3.3V supply or you would damage the device. The pin is given (over simplified) so that when there is a large jump in device activity the cap acts like a small cell to supply the instantaneous current while the internal LDO response lags.

    For more details on routing please refer to the System Design Guideline document for TM4C129 SPMA056.pdf

    Regards
    Amit