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BQ24196: BQ24196 application feasibility help

Star Xu
Genius 9645 points
Part Number: BQ24196
Other Parts Discussed in Thread: TUSB320, BQ24195, BQ24190, BQ25890H, BQ25611D

Hi

The customer designs a control board with battery and OTG functions and wants to use the following chips to implement OTG and charging

BQ24196--charging IC

TUSB320--cc logic chip, configured in DRP mode, ID is connected to the OTG pin of BQ24196 through pull-up

They want to use D+ and D- to detect the actual output current limit through the BC1.2 of the charger protocol, but D+ and D- are occupied by the microcontroller, and this microcontroller does not support the detection of the above protocol.

Currently, the input current is only detected through the cc logic of the TUSB320. However, since most chargers only have a type-A interface, and the connecting line only has a 56k pull-up resistor, it is impossible to use CC to determine whether it can support the output of 2A current. (It is impossible to identify which is a host such as a computer host and which is the host and which is the adapter when using the A to C line.)

Customers don't need data transmission when charging with high current, can it work through a USB switch ? (using bq24195, connecting the USB signal to the microcontroller when standard usb2.0 is detected), but don't know how to deal with PMID and VBUS makes them share a USB port.
Waiting for your reply.
Thanks
Star
  • 0
    TI__Mastermind 28145 points

    Hi Star, 

    Based off your description it appears a charging IC with dedicated D+D- pins may be beneficial for this design. We have multiple IC options to meet this. There is the BQ24190 from the same product family as well as newer ICs such as BQ25890H and BQ25611D. 

    Star Xu said:
    Customers don't need data transmission when charging with high current, can it work through a USB switch ? (using bq24195, connecting the USB signal to the microcontroller when standard usb2.0 is detected), but don't know how to deal with PMID and VBUS makes them share a USB port

    I have some confusion regarding this question. If my answer is not helpful please help to rephrase the question. On BQ24196 PSEL pin can be used to select USB input (lower current limit) or adapter input (higher current limit). Customer will need to decide if they want full BC1.2 with D+/D- pins or if using PSEL input pin to select between 2 current limits is acceptable. 

    Regarding your comment on PMID verse VBUS for USB port please be aware the OTG output will be to both VBUS and PMID pins. If the USB port used for OTG will also be used for charge then it needs to be connected to VBUS. 

    Best Regards,

    Garrett