15 Cell Lithium Ion Battery Controller Analog Front End Reference Design


Design files


The TIDA00255 reference design utilizes the bq76940 analog front end (AFE) IC.  It measures cell voltages, and die temperature or external thermistor voltage using a 14 bit ADC.  Current is measured separately by a separate 16 bit coulomb counter.  The design can turn off low side power FETs to stop discharge or charge based on selected hardware limits.  A microcontroller not included in this design would be part of the battery controller to communicate to the AFE to set protection thresholds, turn on the power FETs, provide fault recovery and turn off the FETs for over or under temperature conditions.  A battery controller design may contain other features  which are not part of this reference design such as secondary over voltage protection, gauging, and isolated communication to let the system know the state of the battery.

  • Measures cell voltages for 15 series cells
  • Measurement of pack current with a 16 bit coulomb counter
  • Digital interface to a microcontroller
  • Hardware protection for overcurrent in discharge, short circuit in discharge, overvoltage, and undervoltage
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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.

TIDU408.PDF (399 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDR773.PDF (299 K)

Detailed schematic diagram for design layout and components

TIDR774.PDF (114 K)

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

TIDR775.PDF (1167 K)

Detailed overview of design layout for component placement

TIDR776.PDF (579 K)

Detailed overview of design layout for component placement

TIDR778.ZIP (1865 K)

Files used for 3D models or 2D drawings of IC components

TIDC482.ZIP (1058 K)

Design file that contains information on physical board layer of design PCB

TIDR777.PDF (5251 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Battery fuel gauges

BQ78350Companion CEDV Fuel Gauge Battery Management Controller for bq76940 Monitor Family

Data sheet: PDF | HTML
Battery fuel gauges

BQ78350-R1CEDV li-ion gas gauge and battery management controller

Data sheet: PDF | HTML
Battery monitors & balancers

BQ769409 to 15-series cell li-ion and li-phosphate battery monitor (bq76940 family)

Data sheet: PDF | HTML

Start development


Support software

SLUC539 bq76940/bq76930/bq76920 Evaluation Software

Supported products & hardware

Supported products & hardware

Battery monitors & balancers
BQ76920 3 to 5-Series Cell Li-Ion and Li-Phosphate Battery Monitor (bq76940 Family) BQ76930 6 to 10-Series Cell Li-Ion and Li-Phosphate Battery Monitor (bq76940 Family) BQ76940 9 to 15-series cell li-ion and li-phosphate battery monitor (bq76940 family)
Hardware development
Evaluation board
BQ76920EVM BQ76920 evaluation board with BQ78350  BQ76930EVM BQ76930 evaluation board with BQ78350 BQ76940EVM BQ76940 evaluation board with BQ78350

Technical documentation

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Type Title Date
Test report TIDA-00255 Test Results Jun. 19, 2014

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