Impedance Track Fuel Gauge Accuracy Test for GSM Phone Applications

The Texas Instruments Impedance Track™ (IT) fuel gauge is designed for reporting remaining battery capacity and run time accurately. To effectively accomplish this reporting a real application environment must be used for test results. The test board should be designed as similar to the real application circuit as possible. This application report outlines the procedure for implementing an accuracy test for GSM and Smart phone applications using the TI System Side Single Cell Impedance Track Fuel Gauge bq27500. The test setups, battery chemistry selection, and battery learning cycle are discussed in this report. Finally, the test results demonstrate that less than 1% remaining capacity accuracy can be achieved by the Impedance Track Fuel Gauge.