Gauging Parameter Calculator: Match chemistry for Impedance Track gauges
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GPC Chemistry ID matching for Impedance Track (IT) algorithm gas gauges (Find closest chemistry match) must be done before Optimizing room temperature or low temperature performance.

Gauging Parameter Calculator Chemistry ID matching for Impedance track gas gauges (GPCCHEM) is a math calculation and simulation tool that helps the battery designer to obtain matching chemistry ID for the specific battery profile. Chemistry IDs are defined by Texas Instruments and can be programmed using Battery Management Studio (bqStudio). The GPCCHEM tool allows the user to increase the accuracy of the fuel gauge IC.

The battery pack must use one of TI’s Impedance Track(IT) algorithm based fuel gauges. It accepts log files in the format specified in the instruction manual. The log files can be created by using TI’s Battery Management Studio (bqStudio) software with the specific Evaluation board connected through USB, or by any battery tester with data logging capabilities like Arbin or Maccor. External equipment is required for charge and discharge. For accurate calculations it will also require additional parameters of the battery pack setup. The output information will be emailed as a text file containing the Chemistry ID. The chemistry ID data can be programmed into Data Flash using bqStudio to create a golden image that can be used in mass production of battery packs.

If bqStudio is used for logging, an EV2300 or EV2400 PC interface board is required to interface to the gas gauge, and a PC USB cable is required for communication with a PC. Both can be ordered online at Windows™-based PC software is available online as well. With the EV2300 or EV2400 interface board and software, the user can read the data registers, program the chipset for different configurations, log cycle data for further evaluation, and evaluate the overall functionality of the solution under different charge and discharge conditions.

This tool is an alternative to the existing Mathcad™ spreadsheet at

This tool does not require the purchase of a separate Mathcad™ license.

Depending on the specific gas gauge product, bqStudio software may provide a packaging utility to create the zip file from the log files.

Note: This tool is not applicable to Compensated End of Discharge Voltage (CEDV) gauges.

Step 1.

Download the instruction manual that applies to your battery pack and collect data per instructions.

This will yield a packaged zip file.

For Chemistry ID matching of Impedance Track(IT) gas gauging:

  1. Download Instruction manual for single / multiple cell (in series) battery pack
  2. Download Data packaging tool (bqStudio) that creates zip file for upload - optional

Step 2.

Upload the zip file.

Login is required.

Upload zip file

Step 3.

Gauging Parameter Calculation chemistry ID match report to be emailed to you.

View a sample report.

Email for support issues related to use of this page.

TI's Standard Terms and Conditions for Evaluation Modules apply.

Technical documentation
Application notes (1)
Title Type Size (KB) Date
PDF 78 05 Jun 2018

TI Devices (15)

Part Number Name Product Family
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BQ27541-G1  Pack-side Impedance Track? battery fuel gauge with integrated LDO  Battery management ICs 
BQ27542-G1  Single cell Impedance Track? pack side fuel gauge with SON package  Battery management ICs 
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BQ27546-G1  Single cell Impedance Track? pack side fuel gauge with DSBGA package  Battery management ICs 
BQ27621-G1  System-side fuel gauge with Dynamic Voltage Correlation, battery gas gauge  Battery management ICs 
BQ27741-G1  Pack-side Impedance Track?(tm) fuel (gas) gauge with integrated protector  Battery management ICs 
BQ27742-G1  Single cell Li-ion battery fuel gauge with integrated protection | battery gas gauge  Battery management ICs 
BQ34Z100-G1  Multi-chemistry Impedance Track? standalone fuel gauge | battery gas gauge  Battery management ICs 
BQ40Z50  1-4 series Li-ion battery pack manager | battery fuel (gas) gauge  Battery management ICs 
BQ40Z50-R1  1-4 series Li-ion battery pack manager supporting Turbo Mode 1.0  Battery management ICs 
BQ40Z50-R2  1-4 series Li-ion battery pack manager supporting Turbo Mode 2.0  Battery management ICs 
BQ40Z60  Complete multi-cell battery manager | battery fuel (gas) gauge  Battery management ICs 

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