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BQ34Z100: How do I write the value of the sampling resistor into the register?

user6003314
Prodigy 40 points
Part Number: BQ34Z100
Other Parts Discussed in Thread: BQSTUDIO, , EV2400

I saw the description in the datasheet "The value of the current sense resistor should be entered into both CC Gain and CC Delta parameters in the Data Flash Calibration section of the Evaluation Software."

And the range of CC GAIN is from "min 1.00E-01" to "min 1.00E-01", CC Delta is from "min 1.00E-01" to "max 1.19E+06"

What do the registers mean? How to create the relationship between the registers and the sense resistor?

For example, if it is connected to a 20mΩ resistor,  how do I configure registers to match?

Thanks. 

  • 0
    TI__Mastermind 42535 points

    Hi,

    If you use bqstudio to perform calibration, it will automatically update the cc gain and offset to the correct value.

  • 0 in reply to Batt
    Prodigy 40 points

    Hi，

    Must the bqstudio cooperate with the evaluation board to use? If I do not have the Bq34z100EVM Board, how could I complete the configuration? 

    Maybe I should know how to create the relationship between the registers and the sense resistor.

    Thanks a lot!

    Isabel Yan

  • 0 in reply to user6003314
    TI__Mastermind 42535 points

    Hi Isabel,

    We advise that you use our evm and tool chain to help you integrate the gauge. That is why you require the evm and an ev2400 and bqstudio. If you don't have it, you need an i2c master that can interface with the gauge and you can communicate to the gauge using either direct i2c commands or make an ev2400 using the schematic we have published and use bqstudio.

  • 0 in reply to Batt
    Prodigy 40 points

    Hi Batt，

    I am very glad to use the EVM and bqstudio, but the time is a little tight for me. I have an i2c master that can interface with the gauge, but the problem is I can not make that two registers(CC GAIN and CC Delta) clear.

    I saw the "1-Cell Li-Ion and 5-LED Display" application schematics in the datasheet, and the sense resistance there is 10mΩ. Could I use a 10mΩ resistor and without any relative register? Or how should I configure that two registers?

    Thanks a lot!

    Isabel Yan

  • 0 in reply to user6003314
    TI__Mastermind 42535 points

    Hi,

    If you are using a 10mOhm resistor you don't need to make any changes as the gauge is by default set to that. Just send the cc offset and board offset commands with no current to calibrate the offsets.

  • 0 in reply to Batt
    Prodigy 40 points

    I got it. Thanks a lot!

    Isabel Yan