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BQ34Z100EVM: bq34z100evm zero state of charge

Mark Watson
Intellectual 530 points
Part Number: BQ34Z100EVM
Other Parts Discussed in Thread: GPCCHEM

Hello,

I am running bqStudio (version 1.3.54) on a 64-bit Windows 7 PC. I have the PC connected to an EV2300 (version 3.1r) which is connected through I2C to a bq34z100evm (firmware 0100_0_16). I have the BAT+/BAT- pins connected to the +/- terminals of a 12 V lead acid battery (7 Ahr). 

I am reading an accurate voltage (but zero current because I do not have a load connected to the battery I presume), but I am getting a reading for SOC of 0%. I must have missed something/done something wrong when I set my parameters. Can somebody please double check my parameters to see hat I have done wrong (see pics below: I am showing my configuration settings and the gas gauging settings)? Does IT need to be enabled to get a SOC reading?

Thanks so much. I am very pleased with TI's customer support (especially Tom Cosby!).

 

  • 0
    Intellectual 530 points
    Please note: I know Flash Update OK Cell Volt = 2800 mV × Number Of Series Cells × 5000/Voltage Divider = 2800 mV x 6 x 5000 / 19148 mV = 4387 mV, but when I enter this value is says that "value is beyond maximum value defined for parameter). The max value it will let me enter is 4200. What am I doing wrong?
  • 0 in reply to Mark Watson
    Intellectual 530 points

    Update: I changed the value of Flash Update OK Cell Volt to 4200, but was still reading a zero SOC.

    Next, I created a Golden Image file so I could save my current parameters in order to play around with a few of them, then right when the image file was created I was suddenly getting a SOC reading (without changing anything else)! I have no idea what happened. I did notice, however, that the SOC1 and SOCF bits in the Flags register have been cleared. I would still really appreciate it if someone more experienced than myself could look over my parameters and let me know what they think.

    Thanks again!

  • 0 in reply to Mark Watson
    TI__Guru 73830 points
    Mark,
    Your Cell Term V seems to be set properly for a PbA cell. This is the usual culprit that causes SOC=0. Have you updated the Chemistry data. if it is still to the default Li-Ion chemistry, then this will cause SOC = 0% as well. You need to program oen of the 800 series ChemIDs and use it until you have run the discharge to find the best ChemID match using the GPCCHEM tool.

    The Flash Update OK Cell Voltage formula appears to be broken for PbA cells. Set the Flash Update OK Cell Voltage to 1000mV.

    The gauge does rest and this forces an FCC simulation when and srec is exported or imported. This may be what caused your SOC to update.

    Tom