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TIDA-00255
15 Cell Lithium Ion Battery Controller Analog Front End Reference Design
TIDA-00255
Overview
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.
Features
- 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
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
Products
Includes TI products in the design and potential alternatives.
Battery fuel gauges
BQ78350-R1 — CEDV li-ion gas gauge and battery management controller
Data sheet: PDF | HTMLStart development
Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| Test report | TIDA-00255 Test Results | Jun. 19, 2014 |
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