User’s Guide May 2002 High Performance Analog Products SLUU112
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use.
EVM WARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range of 2.8–5.5 V and the output voltage range of 2.8 V and 5.5 V. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Contents WARNING This equipment is intended for use in a laboratory test environment only. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to subpart J of part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference.
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Contents Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Kit Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 Ordering Information . . . . . . . . . . . .
Tables Figures 2–1 2–2 3–1 4–1 4–2 4–3 4–4 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Connection to Cells and System Load/Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Initial Data Screen . . . . . . . . . . . . . . . . . . . . . .
Chapter 1 Introduction The bq2023EVM–001 is a complete evaluation system for the bq2023 flash-based battery-monitoring IC circuit module, a current sense resistor, an EV2201 PC interface board for gas-gauge evaluation, a PC serial cable, and Windows-based PC software. The circuit module includes one bq2023 and all other components onboard necessary to monitor capacity and other critical parameters in a one-cell Li-Ion battery pack or a battery pack of any chemistry with a voltage of 2.8–5.5 V.
Features 1.1 Features - Complete evaluation system for the bq2023 battery monitor - Populated circuit module for quick setup - PC software and interface board for easy evaluation - Software that allows data logging for system analysis 1.2 Kit Contents - bq2023 circuit module with sense resistor - EV2201 PC interface board - Set of evaluation software disks entitled EV2201–23 - PC serial cable - Set of support documentation 1.3 Ordering Information Table 1–1.
Chapter 2 Circuit Module The bq2023EVM–001-based circuit module is a complete and compact example solution of a circuit for battery monitoring of a single-cell Li-Ion pack. The circuit module incorporates a bq2023 battery-monitor IC and all other components necessary to accurately monitor the charge and discharge of one Li-Ion cell or a battery pack of any chemistry with a voltage of 2.8–5.5 V.
Pin Descriptions 2.1 Pin Descriptions BAT+ BAT– PACK+ PACK– SDQ PDET STAT cell positive cell negative pack positive pack negative serial communications port pack removal detection status output 2.2 Schematic Figure 2–1 is the schematic diagram for the bq2023EVM–001 circuit module (SLUP142–001). Figure 2–1. Schematic J1 1 2 PACK+ BAT+ R1 1 MΩ R3 100 Ω STAT PDET R2 100 kΩ R4 100 Ω 1 J2 2 R5 R6 100 Ω 100 Ω D2 5.6 V D1 5.6 V U1 BQ2023PW 1 2 C1 0.1 µF C4 0.
Board Layout 2.3 Board Layout Figure 2–2 shows the PCB layers and assembly drawing for the bq2023EVM–001 circuit module (SLUP142–001). Figure 2–2.
Board Layout Figure 2–2.
Bill of Materials 2.4 Bill of Materials Table 2–1 lists the materials required for the bq2023EVM–001 circuit module (SLUP142–001). Table 2–1. Bill of Materials Ref Des Qty-001 Description MFG MFG PART# Size PCB 1 Printed-circuit board, 0.031, FR4, SMOBC, HASL Any SLUP142 Terminal 4 Terminal block 3,5 mm On Shore Technology ED555/2DS 3,5 mm × 2 C1, C2, C3, C4 4 Capacitor, ceramic, 0.1 µF, 16 V, ±10%, X7R Panasonic ECJ–1VB1C104K 603 R8 1 Resistor, 0.
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Chapter 3 EVM Hardware and Software Setup This section describes how to install the bq2023EVM–001 PC software and how to connect the components of the EVM. Topic Page 3.1 Software Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 3.2 Hardware Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Software Installation The following steps install the bq2023EVM–001 software: 1) Insert disk 1 into a 3 1/2 inch floppy drive. 2) Select the 3 1/2 inch drive using My Computer. 3) Double-click the setup.exe icon. The setup program prompts for the remaining disks and installs a Windows application group. 3.2 Hardware Connection There are three hardware components to the bq2023EVM–001: 1) bq2023EVM–001 circuit module 2) EV2201 PC interface board 3) PC 3.2.
3.2.2 PC Interface Connection The following steps configure the hardware for interface to the PC: 1) Connect the bq2023-based smart battery to the EV2201, using wire leads as in Table 3–1. 2) Connect the PC serial cable to the EV2201 and the PC COM port. Table 3–1. Connection EV2201 bq2023-Based Battery EV2201 SDQ SMBD/HDQ1 PACK– VSS The bq2023EVM–001 is now set up for operation.
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Chapter 4 Operation This chapter details the operation of the or bq2023EVM-001 software. Topic Page 4.1 Starting the Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 4.2 Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 4.3 Reading and Writing Flash Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 4.4 RAM Addressing . . . . . . . . . . . . . . . . . . . . . . . .
Starting the Program 4.1 Starting the Program Run EV2201-23 from the Start|Programs|Texas Instruments|bq2023 Battery Monitor menu sequence. The software defaults to PC com port 1 for communication. If the EV2201 is connected to com port 1, the program loads and displays the initial data screen. Figure 4–1. Initial Data Screen The data screen may not show correct information until parameters in the software are initialized.
Initialization 4.2 Initialization This section describes the settings that must be made before the bq2023 is evaluated. 4.2.1 Setting the Programmable bq2023 Wake-Up Threshold Option Select the wake-up threshold with the WOE pulldown tab at location 0x0105. This designates the potential across the sense resistor below which the bq2023 goes to sleep, provided that the sleep enable (SLEN) bit is set. To set the SLEN bit check the sleep enable (SLEN) box. 4.2.
Reading and Writing Flash Memory Figure 4–3. Flash Register Screen 4.3.1 The FED Register The FED register can be used to permanently disable erase and write access to each page of flash. Click the Modify FED button to access this register.
RAM Addressing 4.4 RAM Addressing The RAM page of memory is viewed by selecting the RAM data screen. Click the Read RAM button to read the RAM locations. Each RAM location can be modified by clicking on the individual location and entering the new value in hex. The RAM values can be stored to disk as one data file. To do this, select File|Save RAM File and enter the file name in the Store Ram File window. The file can subsequently be opened using the the File|Open Ram File command from the pulldown menu.
Data Logging 4.5 Data Logging 1) Select Options|Logging Options to select the registers to log and set the logging interval. 2) File|Start Data Log from the pulldown menu. 3) Enter the name of the data log file in the Name Datalog File box. 4) Click the Open button. 5) To stop the data logging, select File|Close Data Log from the pulldown menu. The file can be imported into a text editor, spreadsheet, or word processor program. Example data log: EV2201–23 Version: 1.0.
