Gauging Parameter Calculator



Key user guides:


GPC variants based on gas gauge types and type of optimization

  1. GPC for Compensated End of Discharge Voltage (CEDV) algorithm gas gauges
  2. GPC for Impedance Track (IT) algorithm gas gauges
    1. GPC - Find closest chemistry match (chemID selection)  Must be done before (2) or (3).
    2. GPC -Optimize room temperature performance (calculate Qmax, Ra, and Thermal coefficients).
    3. GPC - Optimize room and low temperature performance. Includes (2).


Gauging Parameter Calculator (GPC) is a math calculation and simulation tool that helps the battery designer to obtain matching parameters/coefficients for the specific battery profile. The tool allows the user to increase the accuracy of the fuel gauge IC over temperature.

The battery pack must use one of TI's Compensated End of Discharge Voltage (CEDV) or 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 CEDV coefficients and/or as optimized data files. This 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 does not require the purchase of a separate Mathcad™ license.

For CEDV gauges, the bqStudio software provides a packaging utility to create the zip file from the log files.

GPC is comprised of three modules/steps:

  1. Download instruction manual/packaging tool and package data - this downloadable instruction manual provides information on setting up the battery pack for charge and discharge at multiple temperature points. It guides the user through the steps to obtain good data and specify the device parameters needed for their application. Parameters include battery pack discharge/charge rates, termination conditions, temperature and pack specific information.
  2. Upload zip file - upon completion of data packaging per the instruction manual, the users can then upload the packaged zip file to TI for the gauging parameter analysis. Registration and legal agreement acceptance is required for the upload.
  3. Emailed Gauging Parameter Calculator report - contains the information on gauging parameter constants that best fit the uploaded data. The report includes values for EMF, EDVC0, EDVC1, EDVR1, EDVR0, EDVT0, EDVTC, VOC75, VOC50, VOC25 and programmable data files (some of these values may not apply to specific gauges).


Email for support issues related to use of this page.


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

Battery fuel gauges
BQ2060 Multi-chemistry SBS 1.1 compliant gas gauge with 5 LED drivers BQ2060A Multi-chemistry SBS 1.1 compliant gas gauge with 5 LED drivers, Additional battery mgmt control BQ2084-V143 SBS v1.1 compliant gas gauge for use with the BQ29312A BQ2085 SBS 1.1 compliant gas gauge with integrated Oscillator for use with The bq29311 BQ27220 Single cell pack/system-side CEDV battery fuel (gas) gauge w/pre-programmed chemistry profiles BQ27320 Single cell pack/System-side CEDV battery fuel (gas) gauge BQ27426 Single cell System-side battery fuel (gas) gauge w/Pre-programmed chemistry Profile BQ28400 Netbook and Tablet Lithium ion gas gauge and protector BQ28550 Single cell Li-ion battery gas gauge and protection BQ28Z610 Battery fuel gauge with integrated protector for 1-2 series packs BQ3050 SBS 1.1-compliant 2-s to 4-s battery gas gauge & protection BQ3060 SBS 1.1-compliant gas gauge and protector BQ78350 Companion CEDV Fuel Gauge Battery Management Controller for bq76940 Monitor Family BQ78350-R1 CEDV li-ion gas gauge and battery management controller BQ78350-R1A CEDV li-ion gas gauge and battery management controller BQ78Z100 Impedance Track™ battery fuel (gas) gauge for 1-series to 2-series

Technical documentation

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Type Title Date
Application note Simple Guide to Chemical ID Selection Tool (GPC) (Rev. A) Jun. 05, 2018
User guide Simple Guide to CEDV Data Collection for Gauging Parameter Calculator (GPC) (Rev. B) Jan. 30, 2018
User guide Golden GG Maker and Resistance Temperature Compensation Optimizer Sep. 10, 2015

Related design resources

Software development

GPCCEDV Gauging Parameter Calculator for CEDV gauges GPCCHEM Gauging Parameter Calculator: Match chemistry for Impedance Track gauges GPCRA0 Gauging Parameter Calculator: Optimize room temperature performance for Impedance Track gauges GPCRB Gauging Parameter Calculator: Optimize room and low temp performance Impedance Track gauges

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