Texas Instruments bq76940 User Manual

User's Guide
SLVU924B–March 2014–Revised April 2014
bq76920 Evaluation Module User's Guide
The bq76920EVM evaluation module (EVM) is a complete evaluation system for the bq76920, a 3-cell to
5-cell Li-Ion battery analog front end (AFE) integrated circuit. The EVM consists of a bq76920 circuit
module which is used for simple evaluation of the bq76920 functions. The circuit module includes one
bq76920 integrated circuit (IC), sense resistor, power FETs, and all other onboard components necessary
to protect the cells from overcharge, over discharge, short circuit, and overcurrent discharge in a 5-series
cell Li-Ion or Li-Polymer battery pack. The circuit module connects directly across the cells in a battery.
With a compatible interface board and Microsoft
®
Windows
®
based PC graphical user interface (GUI)
software, the user can view the bq76920 registers, adjust protection limits and enable FET control outputs.
Contents
1 Features....................................................................................................................... 2
1.1 Kit Contents.......................................................................................................... 2
1.2 Ordering Information ............................................................................................... 2
1.3 bq76920 Circuit Module Performance Specification Summary ............................................... 3
1.4 Required Equipment................................................................................................ 3
2 bq76920 EVM Quick Start Guide.......................................................................................... 3
2.1 Before You Begin ................................................................................................... 3
2.2 Quick Start........................................................................................................... 4
3 bq76940/bq76930/bq76920 Software .................................................................................... 5
3.1 System Requirements.............................................................................................. 5
3.2 Installing the bq76940/bq76930/bq76920 Software ........................................................... 5
3.3 Interface Adapter.................................................................................................... 5
3.4 Software Operation................................................................................................. 6
4 bq76920 Circuit Module Use.............................................................................................. 11
4.1 Cell Simulator...................................................................................................... 11
4.2 Evaluating with Simulated Current.............................................................................. 11
4.3 Reducing the Cell Count ......................................................................................... 12
4.4 Connecting Cells .................................................................................................. 13
4.5 Connecting to a Host ............................................................................................. 13
4.6 Gauge Circuits..................................................................................................... 13
4.7 Unused Components ............................................................................................. 13
5 bq76920EVM Circuit Module Physical Construction................................................................... 15
5.1 Board Layout....................................................................................................... 15
5.2 Bill of Materials .................................................................................................... 23
6 Related Documents From Texas Instruments.......................................................................... 29
List of Figures
1 EVM Connection for Basic Operation..................................................................................... 5
2 bq76940/bq76930/bq76920 Evaluation Software Display.............................................................. 6
3 Registers View ............................................................................................................... 8
4 I2C Pro View ................................................................................................................. 9
5 Sequence View............................................................................................................. 10
6 Simulating Current Setup.................................................................................................. 12
7 Top Silk Screen............................................................................................................. 15
8 Top Assembly............................................................................................................... 16
Microsoft, Windows are registered trademarks of Microsoft Corporation.
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SLVU924B–March 2014–Revised April 2014 bq76920 Evaluation Module User's Guide
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Texas Instruments bq76940 Specifications

General

Brand	Texas Instruments
Model	bq76940
Category	Motherboard
Language	English

Summary

Features

Kit Contents

Lists the items included in the evaluation kit, such as the circuit module and cable.

Ordering Information

Provides details on how to order the evaluation module, including part numbers and configurations.

Performance Specification Summary

Summarizes key performance specifications for the bq76920 circuit module in its default configuration.

Required Equipment

Lists the necessary equipment for operating the bq76920 EVM for basic demonstrations.

bq76920 EVM Quick Start Guide

Before You Begin

Provides crucial safety warnings and cautions before starting the evaluation module setup.

Quick Start

Step-by-step instructions for quickly connecting and demonstrating the operation of the bq76920 EVM.

bq76940/bq76930/bq76920 Software

System Requirements

Outlines the necessary operating system and software prerequisites for the evaluation software.

Installing the Software

Detailed steps on how to download and install the evaluation software for the bq76920 EVM.

Interface Adapter

Explains the function and connection requirements of the interface adapter (EV2300/EV2400) for communication.

Status Section

Details the software's status bar, communication indicators, and common issues.

I2C Section

Explains the I2C address and byte communication tool within the software interface.

Menu Commands

Describes menu options for help, options verification, and exiting the software.

Registers View

Explains the default view for displaying and modifying control register values and status bits.

I2C Pro View

Describes the view for reading/writing sequential registers and managing I2C transactions.

Sequence View

Details the view for creating and executing timed sequences of register reads/writes.

Typical Operation of Software

Outlines the general workflow for operating the evaluation software, including connection and data reading.

bq76920 Circuit Module Use

Cell Simulator

Describes the integrated resistive cell simulator and its use for voltage division and testing.

Evaluating with Simulated Current

Explains methods for applying simulated current for evaluation, including setup and precautions.

Reducing the Cell Count

Provides instructions on how to configure the EVM for evaluating fewer than the maximum number of cells.

Connecting Cells

Details the procedures for safely connecting battery cells to the EVM, including sequence and simulator use.

Connecting to a Host

Discusses connecting the EVM to a microcontroller or other host systems for advanced operation.

Gauge Circuits

Mentions gauge circuits and SMBus interface connector, reserved for future use with specific AFE ICs.

Unused Components

Notes the presence of component patterns on the EVM that may be useful for evaluation purposes.

bq76920EVM Circuit Module Physical Construction

Board Layout

Illustrates the physical layout of the EVM circuit module through various layer and assembly diagrams.

Bill of Materials

Lists all components used in the bq76920EVM circuit module, including designator, value, and manufacturer.

Schematics

Presents the detailed circuit diagrams for the AFE, Gauge, and Cell Simulator sections of the EVM.

Related Documents From Texas Instruments

Revision History

Details changes and updates made to the document across different revisions, including page number references.

Important Disclaimers and Terms of Use

User Responsibilities and Product Use

Outlines user obligations, product limitations, and responsibilities for handling and using evaluation modules.

Warranty, Liability, and Safety

Covers the limited warranty, TI's liability, and crucial safety warnings for evaluation module usage.

Regulatory Compliance Information

FCC, Industry Canada, and Japan Compliance

Provides compliance statements and notices for various regions, including FCC, Industry Canada, and Japan.

Important Notices and Terms

Product Sales, Support, and Safety

Details TI's product sales policies, application support, and critical safety considerations for component usage.