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BQ27Z746: example circuit of BAT_SP and BAT_SN pins

Statham Su
Genius 4990 points
Part Number: BQ27Z746
Other Parts Discussed in Thread: BQ40Z50

Hello Sir:

We are not clearly the functions of BAT_SP/SN.

Would you please help to provide a reference circuit for us?

Looking forward your feedback.

Thanks a lot.

  • 0
    TI__Expert 8245 points

    Hi Statham,

    BAT_SP and BAT_SN are used as sense pins that are connected directly to the terminals of the battery cell. They are used as precise measurement terminals to obtain voltage measurements for BAT. They can be used also to trigger protections such as BDP and BCP which sense a voltage differential between SRP and BAT_SP.

    Best Regards,

    Jackson

  • 0 in reply to Jackson DiGiovanna
    Genius 4990 points

    Hi Jackson:

    Thanks a lot your feedback.

    Would you please help to check our schematic too?

    Looking forward your feedback.

    Thanks a lot.

  • 0 in reply to Statham Su
    TI__Expert 8245 points

    Hi,

    This schematic seems good to me. Do I assume correctly that you are not intending to use the BAT_SP and BAT_SN pins?

    Best Regards,

    Jackson

  • 0 in reply to Jackson DiGiovanna
    Genius 4990 points

    Hi Jackson:

    Thanks a lot your assistance.

    Yes you are right, we do not use BAT_SP/SN pins this time.

    But we have more questions from our end customer.

    1. BAT_SP/SN pins no used in this application, can you let us know if use it does it have advantages for battery pack product?

    2. Does GPO has any special functions? What kind of function does the customer usually use on this pin?

    3. Is the /ENAB pin similar to the /PRES pin of BQ40z50? If this pin is pulled high, what mode will it enter?

    Looking forward your feedback.

    Thanks a lot.

  • 0 in reply to Statham Su
    TI__Expert 8245 points

    Hi Statham,

    The BAT_SP/SN pins provide multiple sensing modes to be configured such as HI-Z or RLO. These pins also enable further detection of protections such as BCP and BDP.

    The GPO pin can be optionally configured to read a second thermistor (using Temperature Enable) or it can be used as a digital output as a host interrupt signal.

    Yes the /ENAB pin has similar functionality. When pulled low, the device will wake or be pulled out of various low power modes.

    Best Regards,

    Jackson