• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 42 subscribers
  • Views 243 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.

CC3220S: Floating pins

Franz Schellhase
Expert 3605 points
Part Number: CC3220S

Hi team,

is there a best practice for handling unused pins of CC3220? 

Not connected means they are provided by the module to the outside but are not explicitly connected to VDD or GND on the actual target PCB. I did not find any direct information about this (www.ti.com/.../cc3220s.pdf. In my opinion this document only refers to the NC pins which are not provided by the module.

Thank you,

Franz

  • 0
    TI__Mastermind 46471 points

    Franz,

    The pins that are stated as NC in the datasheet should be left floating.

    For other GPIOs that are not in use, you can add a 2.7K or stronger pull-down to ensure that the state of the line is maintained during power on reset. Without a pull-down, the line can get pulled by internal pulls momentarily and can cause a glitch that can last up to 15ms.

    BR,

    Seong

  • 0 in reply to Seong Kim
    Intellectual 785 points

    Hello,

    is there a software based solution like configuring a internal pulldown ?

  • 0 in reply to Arnaud Moeschwitzer
    TI__Mastermind 22935 points

    Hi Arnaud,

    All pins default to Hi-Z unless they are specifically programmed by the MCU to a specific setting. 

    Our examples have a parkInfo structure in the ti_drivers_config.c file generated by syscfg after you build a project in CCS. The parkInfo determines whether the pins are pull up or pull down when the device goes into sleep mode. Our examples configure most pins to be a weak pull down by default. 

    If you are concerned about EMI on unused pins while the MCU is active you can configure them how you wish using our GPIO drivers. 

    But generally I would recommend you follow our hardware guidelines and you should be fine.

    Jesu