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BQ41Z50: BQ41Z50 Unused Pin Confiuration

Tom Tsao
Expert 1840 points
Part Number: BQ41Z50

Tool/software:

Hi Teams,

In the BQ41Z50 datasheet, some unused pins are recommended to be left floating, while others can be connected to VSS through a 20kΩ resistor or left floating.

I have a few questions I'd like to clarify.

  1. Why is there a difference in treatment between unused pins?

  2. For pins that allow a 20kΩ pull-down, can multiple pins share one 20kΩ resistor?

  3. Between floating and using a 20kΩ pull-down, which option is generally preferred?

Thanks.

Best regards,

  • 0
    TI__Mastermind 25225 points

    Hello Tom,

    The person that this question has been assigned too is out of office and please allow for some time for him to review this question.

    Thank you,
    Alan

  • 0 in reply to Alan Frias
    TI__Mastermind 25665 points

    Hi,

    Tom Tsao said:
    Why is there a difference in treatment between unused pins?

    These are requirements from he designs team based on the requirements for the internal circuitry or due to pin functionality. 

    Tom Tsao said:
    For pins that allow a 20kΩ pull-down, can multiple pins share one 20kΩ resistor?

    I can check with the design team on this.

    Tom Tsao said:
    Between floating and using a 20kΩ pull-down, which option is generally preferred?

    Please follow the data sheet.

    Regards,

    Diego

  • 0 in reply to Diego
    TI__Mastermind 25225 points

    Hello Tom, 

    From the designer engineer I was able to get this information back from him

    Tom Tsao said:
    For pins that allow a 20kΩ pull-down, can multiple pins share one 20kΩ resistor?

    "Yes, unused pins make share a single 20k Ohm pull down resistor"

    Tom Tsao said:
    Why is there a difference in treatment between unused pins?

    "Some unused pins may increase leakage if shorted to ground, please follow the datasheet recommendations for each pin"

    Thank you,
    Alan