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BQ24253: How to use the D± pin

Dice-K
Mastermind 6827 points
Part Number: BQ24253
Other Parts Discussed in Thread: BQ25616

Hi support team,
I have two questions about the D± pins.

bq24253_D-pin.pdf

Regards,
Dice-K

  • +1
    TI__Mastermind 25295 points

    Hi Dice-K, 

    Please see my answers to your questions below. 

    1) Yes it is recommended to isolate the connection of D+/D- lines to either BQ24253 or MSP430 using a multiplexer, etc. Once BC1.2 detection is complete the /PG pin status on the BQ24253 will change. This signal can be used to change the D+/D- connection to the MSP430 for data transfer. 

    2) If D+/D- based detection will not be used I recommend shorting D+/D- pins together. Shorting the pins together will result in DCP detection and then current limit is set by ILIM resistor. 

    Additionally, I wanted to bring your attention to a newer standalone charger option the BQ25616. This part has similar features to the BQ24253 and is years newer and lower cost. 

    Best Regards,

    Garrett