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Using BQ34Z100-G1 with single LiIon battery...

Phani Kumar
Intellectual 260 points
Other Parts Discussed in Thread: BQ34Z100-G1, BQSTUDIO

Hi,

I am planning to use BQ34Z100-G1 for fuel guaging. I got the sample and when I tried to read throgh the data sheet/ application note - I was not able to figure out how do I connect this guage to Battery and communicate with some micro (planning to use variant of ARM7) - as my requirement is not using any FET, No LED's and as less components as possible - as I am using only one LiIon battery (around 3.6V). Below is the circuit I thought (after going through) data sheet and google. Can some expert here - give me review this? My ckt is shown below (NC - Not connected)

Also also any simple "guide" for s/w intialization and reading the bare minimum things like total charge, remaining charge, % of battery etc.

  • 0
    TI__Guru 73830 points

    Phani,

    The circuit looks okay, except that you do not need the 1 kohm resistor in the thermistor path. The EVM users guide provides some guidance on programming the device.


    Tom

  • 0 in reply to ThomasCosby
    Intellectual 260 points
    Hi Tom (I was just trying to send email directly to you :)),

    Thanks a lot for confirming the circuit. OK - I take a note of removing 1KOhm.

    On interfacing with I2C lines, I followed your link e2e.ti.com/.../820268 and still I read only 0xFF. Any thing I need to read specifically in EVM user gude?

    With best regards,
    Phani.
  • 0 in reply to Phani Kumar
    TI__Guru 73830 points
    Phani,
    The basic circuits looks correct, except for the 1 kohm resistor that I mentioned. I did not realize that you are not working with the TI EVM, so I did not comment on the capacitors. You need to add capacitors to REGIN and REG25. You can verify that REG25 is stable at 2.5V after attaching the battery. AS far as communication goes, you are going to need to use the EV2300 and bqStudio to setup and optimize the pack. There are parameters, such as the chemistry data, that cannot be programmed to the device without using these tools. You also have to collect data during the optimization cycle and bqStudio makes this very easy. You can then move to using your uC to communicate with the device after the development phase has completed.

    Tom
  • 0 in reply to ThomasCosby
    Intellectual 260 points

    Hi Tom,

    Thanks a lot for your suggestion. I have modified the circuit (with capacitors you suggested). Let me know if you think this is ok.

    Also I have ordered EV2300 - USB-Based PC Interface Board for Battery Fuel (Gas) Gauge Evaluation and once I receive it, I will verify and get back to you.

    With best regards,

    Phani.

  • 0 in reply to Phani Kumar
    TI__Guru 73830 points
    That looks okay. The I2C pins should not be pulled higher than 5.5V.