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Original question:

TMCS1123: TMCS1123A1

TMCS1123: Can we leave VOC & /OC floating when not using these two pins?

Marsh Cai
Expert 4225 points
Part Number: TMCS1123

Hi Teams,

Can you kindly help to support this request?

Can we leave VOC & /OC floating when not using these two pins?

BRs,

Marsh

  • 0
    TI__Mastermind 26105 points

    Hello Marsh,

    Although these pins can be left floating, for lower power consumption when not used, I recommend the following connections:

    VOC: Connect to VS

    OC: Connect to GND

    Regards,

    Mitch

  • 0 in reply to Mitch M
    TI__Expert 4225 points

    Hi Mitch,

    Thanks for the reply. 

    May I know how many the power consumption difference will be brought by floating this two pins?

    We are trying to attack our competitor, whose these two pins were NC and floating configured by customer, but P2P was requested by customer. So I am asking for help.

    BRs,

    Marsh

  • 0 in reply to Marsh Cai
    TI__Mastermind 26105 points

    Hello Marsh,

    There is no way to really know because we won't know what the floating voltages are. For example, when VOC is left floating, it's possible that the device sees it as an over current and tries to trip the OC. With this left floating, that won't be a big deal, but there will be some small leakage current. 

    That being said, the current draw will be minimal, and either way the device will be within datasheet spec. My recommendations for the first comment are just best practice, but they will be fine leaving the pins floating.

    Regards,

    Mitch

  • 0 in reply to Mitch M
    TI__Expert 4225 points

    Hello Mitch,

    Thank you for the reply. Although based on my understanding that Voc & /OC shouldn't affect the accuracy, but to make sure, i would like to check with you twice is that true whether using Voc & /OC or not will not affect the accuracy.

    Looking forward to your reply.

    BRs,

    Marsh

  • 0 in reply to Marsh Cai
    TI__Mastermind 26105 points

    Hey Marsh,

    Correct, the accuracy will not be affected by whether or not you use Voc and OC.

    Regards,

    Mitch