System-side Impedance Track™ fuel (gas) gauge reference design


Design files


This reference design includes one bq27425-G2B circuit module with an integrated current-sense resistor. A separated orderable, EV2300 or EV2400 PC interface board for gas gauge interface along with a PC USB cable, and Windows™-based PC software, is needed when using this design. The circuit module includes one bq27425-G2B integrated circuit and all other onboard components necessary to monitor and predict capacity for a system-side fuel gauge solution. The reference design connects directly across the battery pack.

  • Number of series cells: 1S
  • Maximum input volts: 4.5 V
  • Maximum charge current: 2 A
  • Communication: I2C
  • Integrated sense resistor
  • This reference design requires the use of a communications tranciever; EV2400

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDR086.PDF (42 K)

Detailed schematic diagram for design layout and components

TIDR087.PDF (42 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDU115.PDF (273 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Battery charger ICs

BQ24160I2C 1cell 2.5A Buck battery charger with dual-input, Power Path and USB detection

Data sheet document-pdfAcrobat PDF open-in-new HTML
Battery fuel gauges

BQ27425-G1System-side Impedance Track™; fuel gauge with direct battery connection | gas gauge battery

Data sheet document-pdfAcrobat PDF

Technical documentation

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Type Title Date
* User guide TIDA-00051 Test Results Aug. 27, 2013

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