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BQ34Z110 REGIN

Kiran Kumar R
Prodigy 100 points
Other Parts Discussed in Thread: BQ34Z110

Hi,

could  the voltage at the REGIN pin of bq34z110 when connected to 24V lead acid battery (2 batteries in series) be closer to 7.48 V? In this case I've also  found the internal temperature (by using Internal_Temp() )of the fuel gauge is reaching 55 degree Celsius.

Thanks

Kiran

  • 0
    TI__Guru 73830 points

    Kiran,

    The  maximum recommended voltage rating for the REGIN input is 4.5V and the Absolute Maximum rating is 5.5V. You will excite the ESD protection circuitry, if you apply a higher voltage. You will also increase the power dissipation in the internal regulator.

    Tom

  • 0 in reply to ThomasCosby
    Prodigy 100 points

    Hi Tom,

    Thanks for replying. I found the fault in my circuit. The n-mosfet was bad. Replaced it and the gauge is working.

    Regards

    Kiran

  • 0 in reply to Kiran Kumar R
    Prodigy 100 points

    Hi Tom,

    I'm using PIC microcontroller to communicate (I2C) with BQ34Z110. I'm able to read data from DF as well writing to it. I've executed a code to read Analog Conversion Counter, Analog Current, Analog Cell Voltage, and Analog Temperature: and have got on one iteration,

    0x79 = 0x03
    0x7A = 0x50, 0x7B = 0x62
    0x7C = 0x41, 0x7D = 0x00
    0x7E = 0x00, 0x7F = 0x01

    Now my doubt is, are these values really from those locations or not! Please help me in sorting out this.

    Thanks

    Regards

    Kiran 

  • 0 in reply to Kiran Kumar R
    TI__Guru 73830 points

    Kiran,

    Those are the correct register addresses. Check to make sure that you are in CAL mode by reading the Control Status register to see if the CALEN it is high.

    Make sure that you swap the CAL enable bytes, if you are using the Write I2C Data Block command on the I2C Pro screen.

    e.g.  I2C Command 00  Data Block 2D00


    Regards

    Tom

  • 0 in reply to ThomasCosby
    Prodigy 100 points

    Tom,

    Thanks for replying.

    I've got the required bytes. Found Analog Conversion Counter increasing in consecutive reads.

    Thanks a lot.

    Regards

    Kiran