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BQ25606: Li-ion charger BQ25606 with FT232R USB to serial converter

D3jun58
Intellectual 370 points
Part Number: BQ25606
Other Parts Discussed in Thread: BQ25601D

Hello,

I would like to make a Li-ion battery charger based on BQ25606RGET single cell battery charger. Most of the time, a comercial USB (phone) charger will be used (charge current up to 2.5A), but sometimes will this charger be also connected to a PC (max. current 500 mA) and because on my design will be also a microcontroller used, I am going to implement also a FT232R (USB to serial UART). I'm wondering that pull-up resistors (1k5) included on D+ and D- pins on FT232R will "confuse" a BQ25606RGET charger in charger detection mode, because this resistors will change a voltage on D+ and D- lines. What do you think?

Many thanks,
BR,
Dejan.

  • 0
    TI__Genius 11850 points

    Hi Dejan,

    If your pull-up resistors change the D+/D- pin voltages, this could cause D+/D- detection to work incorrectly. I would recommend ordering an EVM and evaluating it in your system to be sure.

    However, since your design already includes a MCU, I would suggest looking into the BQ25601D instead. The BQ25601D is very similar to the BQ25606, but it is host-controlled, which offers greater flexibility. The BQ25601D also has D+/D- detection, but the host can also overwrite this result and change the input current limit to the desired value (100 mA to 3.2 A range).

    Best regards,

    Angelo