bq34z100 State of Charge showing wrong

dilshad am

Other Parts Discussed in Thread: BQEVSW, BQ34Z100, BQ34Z110

Hello,

We are using Li ion 2 cell battery with max 8.4 V and 3400 mAh. In my application minimum battery voltage is 6 V.

So the range is 6V-8.4V. How can I set the limit for minimum and maximum voltage values. I am reading 0x02/0x03 satate of charge registers, it is showing wrong % status of charge . But I am getting exact battery voltage while reading 0x08/0x09 registers. How can I configure with the above mentioned range? Please suggest.

over 11 years ago

0 ThomasCosby over 11 years ago

TI__Guru 73830 points

You should set the Cell Term Voltage to 3V, so that 6V will be the SOC = 0% point. Then run your optimIzation cycle to align QMAX to this range.

0 dilshad am over 11 years ago in reply to ThomasCosby

Prodigy 50 points

Hello ,

Thanks for quick response. How can I configure Cell Term Voltage & optimIzation cycle to align QMAX ?

Please brief me about this.

0 dilshad am over 11 years ago in reply to dilshad am

Prodigy 50 points

Hello Thomas,

Do you have sample code for setting cell term voltage.

0 ThomasCosby over 11 years ago in reply to dilshad am

TI__Guru 73830 points

The Cell Term Voltage is a data flash parameter on the Gas Gauging screen in the bqEVSW. You set it to the cell voltage where you want SOC = 0%.

0 dilshad am over 11 years ago in reply to ThomasCosby

Prodigy 50 points

Yes, we are using EV2300 and it is connected to bq34z100 through I2C . Communication successfully happening with bqEVSW. We could able to read current situation of DATA RAM and DATA FLASH. But How to edit parameters and load in to the bq34z100 IC?

Cell term voltage is showing 3000 mV .

What are the parameters we have to configure for getting proper response(SOC).

0 Ivan Stepanov over 10 years ago in reply to ThomasCosby

Intellectual 305 points

Hi Thomas, could you help me with similar problem? We are using BQ34Z110 with lead-acid battery 12V, 27Ah, 6 cell. Minimum voltage in our application is 1.63V per cell. Which value we must send to CellTerminationVoltage, if minimum voltage CellTerminationVoltage (from SLUSB55B) is 2.4V?

0 ThomasCosby over 10 years ago in reply to Ivan Stepanov

TI__Guru 73830 points

Ivan,

The bqEVSW is setting the lower limit for the Termination Voltage. You can export a gg file, change the parameter and then import the gg file. Press the Write All button and the updated Termination Voltage should appear in the data flash table.

Tom

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bq34z100 State of Charge showing wrong