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BQ24192I: In an DRP application how do I dynamically set the charger to either charge according to advertised capabilty or source 500mA?

Thomas Kofoed-Hansen
Intellectual 550 points
Part Number: BQ24192I
Other Parts Discussed in Thread: BQ25896, PMP11536, PMP4496, BQ25895, BQ24192

Hi,

I have been looking at the BQ24192I charger which I want to use in a battery powered application with only an USB Type-C USB 2.0 connector as the only connector. It has to act as a DRP and be able to be charged according to the advertised capabilities (but 3A max) when ever possible while communicating on the USB 2.0 data path, or it must be able to source (500mA max) a UFP device (memory stick etc.).

If connected to another DRP it shall prioritize the UFP role so that it can be charged.

I would like it to be able to also function without the application processor when the turned off, so that we dont have to boot the device when attaching a charger. When on my device has an application processor with I2C connection.

I have also looked at the BQ25896, but I'm not sure what the differences are.

  • 0
    TI__Mastermind 25800 points

    Hey Thomas,

    I would take a look at PMP11536: USB-C DFP + 5V2A Power Bank With Input Fast Charger Reference Design

    and 

    PMP4496: USB-C DRP Power Bank With Fast Charger Input Reference Design

    These are two reference designs using the bq25895 as the charging device with USB-C input and DRP and DFP functionality. 

    Several pins would have to be changed in order to use the bq24192 which is almost pin-to-pin compatible with the bq25896. The bq2589x family is more feature rich than the bq2419x family of parts however, including integrated ADC measurement capability for VBUS, VBAT, ICHG, etc, the ICO feature to automatically detect optimal input current limit, IR compensation, The bq25896 also provides more output current (OTG mode) than the bq24192I, but only handles less charge current.

    In regards to your application processor being turned off, these reference designs I mentioned above utilize a host MCU to handle arbitration and DFP/DRP roles. 

    Hopefully these two get you on the right track to developing what you want.

    Regards,

    Joel H