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BQ27510-G2 fuel gauge to charger BQ24072 connection

Ben Williams
Intellectual 310 points
Other Parts Discussed in Thread: BQ24072, BQ27510-G2, BQ27510

Hello, What is the best way to interconnect the fuel gauge BQ27510-G2 and the charger BQ24072? and I want to only use one battery pack thermistor for both IC's First can this be done if so how ? Or is it recommended to have two Thermistors in the circuit ? This is what I have so far (Please note I'm not a fully trained electronics engineer I'm only in training, so please excuse the messy layout and please feel free to point out any mistakes).

Circuit Info: Input Voltage via Mini-USB =5V Battery Voltage = 3.7V BQ24072: set to USB500 mode ISET= 450mA TMR= 3.5 Hours

Thank You And Hope Someone Can Help

Ben W

1462.Power System.pdf

  • 0
    Intellectual 520 points

    Hi,

    In first, I can give you a tip ; for the thermistors, you must put it close to the battery and not in the electronics board. In your schematics, you will measure the temperature of your card and it could be very different.

    I also use a BQ27510 with a charger and only one thermistor. The software configuration of the fuel gauge is descibe in page 22/23 in datasheet : Pin Function Description and I use the config 1. On the schematics, I connect the thermistor on TS input of the fuelgauge and the BAT_LOW/BAT_GD to the TS input of the charger. I add the 10K resistor (depend of your charger) between TS input of charger en GND. In the fuelgauge, in the config PFC = 1, the BAT_LOW/BAT_GD pin is an open drain ; when the temperature un good, the transistor is open and when the temperature is out of range, the transistor is open and short the 10K resistor.

    do you understand what I do ?