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BQ24297: Wrong Detection of VBUS

Ashish Macwan
Prodigy 20 points
Part Number: BQ24297
Other Parts Discussed in Thread: BQ24296

Hi,

I am using the BQ24297 single-cell charging IC for my product.

I am facing an issue regarding the incorrect detection of the VBUS.

I have connected a 5V, 3Amp adapter to the VBUS pin, but when I read the Charger Status Register, it shows VBUS:1 (USB host). As a result, my IC limits the charging current to the battery.

Note: I am not updating any parameters to the IC, so it will use default parameters during power-on.

Below is the schematic I have attached for reference.

  • 0
    TI__Mastermind 21725 points

    Hello, 

    Thank you for reaching out via E2E. Upon review of your schematic I see D+ pin is connected directly to GND and D- is connected to a node you have labeled PG. Is your intention to not use the D+/D- based input type detection feature? 

    If so modifications will need to be made to your schematic to force D+/D- detection to result in a 3A input current limit.

    An alternate option to always set input current limit to 3A is to use the BQ24296 instead of the BQ24297. The BQ24296 does not have D+/D- pins and 3A current limit can be set by simply connecting pin 2 'PSEL' to GND. 

    Best Regards,

    Garrett 

  • 0 in reply to Garrett Kreger
    Prodigy 20 points

    Hello,

    Thank you for your response. I've identified the problem lies within the schematic side of things. It seems that integrating the BQ24296 into the design could potentially resolve this issue.

    Regarding the Battery Charger Spec 1.2 video, if I understand correctly, using a 200-ohm resistor between the D+ and D- pins might allow us to set the input current to 3A. Is my understanding correct?

  • 0 in reply to Ashish Macwan
    TI__Mastermind 21725 points

    Hello, 

    Yes you can use a 200 ohm resistor between D+ and D- pins to have input detection result in 'charging port' and set input current limit to 3A on the BQ24297. 

    Best Regards,

    Garrett