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BQ34Z100 4 LED configuration ( 2 LED not lighting up )

Liat Keng Kang
Prodigy 130 points
Other Parts Discussed in Thread: BQ34Z100, BQEVSW

I am configuring the BQ34Z100 to 2-in series cell ( LiFePo4 ) and is intending to use 4 LED and a tact switch. The schematics .

I managed to link the fuel gauge to my EV2300 . And also able to get the reading on screen.

2 questions :

1) I cannot get the Full charge capacity reading to stay at 3000mAh. I send B80B Hex to command 0x00 and the Full charge capacity changed to 3000 mAh, but after I depress the tact switch, the reading goes to 925mAh... why is this do ?

2) I cannot get the P3 and P4 to turn ON the 3rd and 4th LED. I can only get P1 and P2 signalling the 1st and 2nd LED. Even when the capacity is above 50% ~ 100%, the 3rd and 4th LED just did not light up... what configuration is wrong here ?

  • 0
    Prodigy 130 points

    I have tried to play with the content at LED_COMM CONFIGURATION, but no matter what configuration I choose, the 3rd and 4th LED just did not light up.. why ?

  • 0 in reply to Liat Keng Kang
    Prodigy 130 points

    I attach the configuration window here as well...

    thanks

  • 0 in reply to Liat Keng Kang
    TI__Guru 73830 points

    Are you using the I2C interface for communications? You have to use the HDQ interface when using the 4-LED option. Using the I2C interface will prevent the P3 and P4 from driving the LEDs.

  • 0 in reply to ThomasCosby
    Prodigy 130 points

    hi Thomas, you are absolutely correct !

    All the 4 LEDs is lighting up perfectly now. I click on the "sent HDQ", and then perform a "change comm to HDQ" to the fuel gauge ( irreversible process ), reset the entire system and the lights are lighting up perfectly now.

    beautiful...

    thanks, problem solved.

  • 0 in reply to Liat Keng Kang
    Prodigy 120 points

    Good Day Liat and Thomas

    Thank you Liat and Thomas. I had exactly the same problem. I think TI should write up a Tutorial on this. 

    Mine is also working now! Just for the Others. The LED code is 0A for LED always ON and 4 LED mode. Otherwise, it is 02 and set the LED Hold time to the desired time you want it to display when pressing the LED ON Switch. 

    I leave mine on and use Low brightness LEDs with higher current limiting resistors. The zener Diodes can also be changed to 5.2 or 5.6V ones, which are more ready available. all the best for the others.

    Thank you.

    Solomon Smit

  • 0 in reply to Solomon Smit
    Prodigy 120 points

    Good Day Thomas,

    Now I need to figure out how to set the Battery's Capacity (20Ah), Fully Charged Voltage, Depleted Charge Voltage via HDQ. Any ideas, Tom? I also would like to save this configuration and load it onto all our BQ34Z100 Fuel Gauges.

    Thank you,

    Solomon Smit

  • 0 in reply to Solomon Smit
    TI__Guru 73830 points

    Solomon,

    You can update parameters with bq34z100 HDQ bqEVSW program and it will allow you to import and export senc files to save configuration into other devices. This will be extremely slow. We recommend using the I2C interface for programming the device and then switch it over to HDQ mode after programming has been completed. 

    Tom