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BQ25895: About Multiple Charge option and USB Charge

Egemen Aksoy
Intellectual 425 points
Part Number: BQ25895

Tool/software:

Hello,

In our Sensor Node project, we are using BQ25895 as a Li-Ion battery charger. We also charge battery from the SMPS output in our project.

The schematic is attached.

So how can we implement USB charge to our system as a charge option?

In our design, there is only one USB connector, and connector data pins are connected to the MCU. How can we design a fast charge feature with only one USB interface?

Best regards,

Egemen Aksoy

  • 0
    TI__Mastermind 25805 points

    Hi Egemen, 

    Please see my comments below. 

    If you wish to use USB D+/D- lines for USB BC1.2  input type detection you will need to use a multiplexer to initially isolate the D+/D- lines from the MCU. Our BQ25895EVM board uses a multiplexer. The schematic is on page 18 of the BQ25895EVM User's Guide found on TI.com. 

    If you do not wish for BC1.2 detection you can leave D+/D- pins open or short them together to set input current limit to either 500mA or 1.5A. Additionally input current limit can be further modified via I2C in REG00. 

    Best Regards,

    Garrett