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validating bq27425-G1 fuel gauge

kunala vidya sagar
Prodigy 40 points

Hi,

I'm testing bq27425-G1 fuel gauge. From the beginning it is displaying wrong pack voltage in GUI. I'm trying to understand what could be reason for this but not found till now.

 I previously evaluated bq27520-G1 fuel gauge, it is showing correct values in GUI. I know that only after performing learning cycle, any fuel gauge displays all the values (ex- Battery remaining capacity, time to empty or full etc) correct but pack voltage it displays correctly from beginning. can you please suggest me what could be the reason for this ?

Also from the datasheets understood that there is no seperate learning cycle need to be performed for this fuel gauge, i.e it will learn during normal operation. please comment on this.

Thanks & Regards

k vidya sagar

  • 0
    TI__Genius 14985 points

    Can you please attach a log file showing the wrong readings you are getting from the gauge?

    You are correct that a learning cycle is not needed to create a golden file for bq27425-G1, but you still need to configure the basic values and generate a golden file that is suitable for your battery.  For example, you need to tell it your battery capacity and it will start with that for the default and learn a more accurate capacity and resistance profile during operation in the field.

  • 0 in reply to dMax
    Prodigy 40 points

    0753.2-04-2012.log

    Attached a sample log file. At the time of logging, actual battery voltage is 3.800V but if you see in the log file it recorded as 3565mV. I did not connect any load/charger in this case. sometimes without any changes from end, battery voltage reading on the GUI decreases and increases automatically. please suggest me reason for this ASAP.

    As you mentioned, i configured fuel gauge with battery capacity, taper current etc. parameters wrt my Battery & application before starting testing fuel gauge.

    Thanks & Regards

    kunala vidya sagar 

  • 0 in reply to kunala vidya sagar
    TI__Expert 4115 points

    Hello Kunala,

    The log shows that the Flags() Register is 0x0116, this means the device is in Configuration Update Mode (CFGUPMODE bit is set) and that the device has not detected the battery (BAT_DET is clear).  You want to make sure you are only in config update mode when updating the necessary parameters for the gauge.  Please send the SOFT_RESET command (0x0042) to get out of config update mode and then send the BAT_INSERT command (0x000C) to let the gauge know the battery has been inserted.