User’s Guide July 2002 PMP SLUU126
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 2.8–5.5 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 Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Kit Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 Ordering Information . . . . . . . . . . . .
Contents Figures 2–1 2–2 3–1 4–1 4–2 4–3 4–4 4–5 4–6 4–7 bq26231EVM-001 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . bq26231EVM-001 Circuit Module Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . bq26231EVM-001 Circuit Module Connection to Cells and System Load/Charger . . . . . Initial Register Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1 Introduction The bq26231EVM–001 is a complete evaluation system for the battery monitoring IC bq26231. The EVM includes one bq26231 circuit module, an EV2200 PC interface board for gas-gauge evaluation, a PC serial cable, and Windows-based PC software. The circuit module includes one bq26231 and all other components onboard necessary to monitor capacity and other critical parameters in a one-cell Li-Ion battery pack. The circuit module connects directly across the cell in a battery.
Features 1.1 Features - Complete evaluation system for the bq26231 battery monitor IC Populated circuit module for quick setup PC software and interface board for easy evaluation Software that allows data logging for system analysis - bq26231 circuit module with sense resistor EV2200 PC interface board Set of evaluation software disks entitled EV220–231 PC serial cable Set of support documentation 1.2 Kit Contents 1.3 Ordering Information Table 1–1.
Chapter 2 Circuit Module The bq26231EVM-001 based circuit module is a complete and compact example of a circuit for battery monitoring of a single-cell Li-Ion pack. The circuit module incorporates a bq26231 battery monitor IC and all other components necessary to accurately protect and monitor the charge and discharge of single Li-Ion cell. This EVM can also be used for 3-series NiMH applications.
2.1 Pin Descriptions BAT+ Cell positive/pack positive (PACK+) BAT_ Cell negative PACK– Pack negative HDQ Serial communications port RBI Register backup input 2.2 Schematic Figure 2–1 is the bq26231EVM-001 (SLUP148) circuit module schematic diagram. Figure 2–1. bq26231EVM-001 Schematic J2 1 2 BAT+ D2 R1 100 Ω RBI R7 1M U1 R3 100 kΩ C1 0.1 µf 1 2 3 4 NC VCC VSS HDQ NC SR1 SR2 RBI 8 7 6 5 bq26230PW/ bq26231PW R3 100 Ω C2 0.1 µf R6 BAT– 100 kΩ R5 100 kΩ C3 0.1 µf C4 0.1 µf R8 0.
Board Layout 2.3 Board Layout Figure 2–2 shows the PCB layers and assembly drawing for the bq26231EVM-001 circuit module (SLUP148). Figure 2–2. bq26231EVM-001 Circuit Module Layout R3 C1 J2 R1 10.80 44.45 1 C4 C2 U1 R5 C3 R6 J1 TEXAS INSTRUMENTS SLUP148 A TOP ASSEMBLY 10.80 D1 R4 R2 R8 R7 D2 44.45 TEXAS INSTRUMENTS SLUP148 A BOTTOM ASSEMBLY J2 J1 25.40 TEXAS INSTRUMENTS SLUP148 REV. A 4.
Board Layout Figure 2–2. bq26231EVM-001 Circuit Module Layout (Continued) TEXAS INSTRUMENTS SLUP148 REV. A LAYER 1 TEXAS INSTRUMENTS SLUP148 REV. A LAYER 2 TEXAS INSTRUMENTS SLUP148 REV. A MASK 1 TEXAS INSTRUMENTS SLUP148 REV.
Bill of Materials 2.4 Bill of Materials Table 2–1 lists materials required for the bq26231EVM-001 circuit module. Table 2–1. Bill of Materials Ref Des Description MFG PCB Qty–002 1 Printed circuit board, 0.031, FR4, SMOBC, HASl Any MFG Part No. Size Terminal 2 Terminal block 3,5 mm On Shore ED555/2DS 3,5 mm × 2 C1, C2, C3, C4 4 Capacitor, ceramic, 0.1 µF, 16 V, ±10%, X7R Panasonic ECJ-1VB1C1104K 603 R1 1 Resistor, 1 MΩ, 1/16 W, 5% Panasonic ERJ-3GSYJ105 603 R8 1 Resistor, 0.
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Chapter 3 EVM Hardware and Software Setup This section describes how to install the EV2200-231 PC software and how to connect the components of the EVM. Topic Page 3.1 Software Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 3.2 Hardware Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Installation 3.1 Software Installation The following steps install the EV2200–231 software: 1) Insert disk 1 into a 3 1/2 inch floppy drive. 2) Select the 3 1/2 inch drive using My Computer or Windows Explorer. 3) Double-click the Setup.exe icon. 4) 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 bq26231EVM-001: 1) bq26231EVM-001 circuit module 2) EV2200 PC interface board 3) PC 3.2.
Hardware Connection 3.2.2 PC Interface Connection The following steps configure the hardware for interface to the PC: 1) Connect bq26231EVM-001 to the EV2200 using wire leads as shown in Table 3–1. Table 3–1. Circuit Module-to-EV2200 Connection bq26231 Based Battery EV2200 HDQ SMBD/HDQ1 PACK– VSS 2) Connect the PC serial cable to the EV2200 and the PC COM port. The bq26231EVM–001 is now set up for operation.
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Chapter 4 Operation This chapter details the installation operation of the EVM2200-231 software. Topic Page 4.1 Software Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 4.2 Starting the Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 4.3 Software Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 4.4 Data Logging . . . . . . . . . . . . . . . . . . .
Software Installation 4.1 Software Installation The following steps install the EV2200–231 software: 1) Insert disk 1 into a 3 1/2 inch floppy drive. 2) Select the 3 1/2 inch drive using My Computer or Windows Explorer. 3) Double-click the Setup.exe icon. 4) The setup program prompts for the remaining disks and installs a Windows application group. 4.2 Starting the Program The installation process creates an icon labeled EV2200-231. Find this icon and double-click it.
Starting the Program Figure 4–1.
Software Instructions Figure 4–2. Loading Screen That Shows the Board Detection Is Failing 4.3 Software Instructions When the software is running, you can select 4 tabs: 26231 Registers, Graphs, Read/Write Regs., and Setup. 4.3.1 bq26231 Registers Screen The register section at the top of this screen is common to the Graphs and the Read/Write Regs. tabs. In the register display section, each of the allocated bq26231 registers can be viewed in hexadecimal (Hex) or decimal (Dec).
Software Instructions 4.3.3 Read/Write Regs Screen The function of this tab is to allow the user to program any of the data registers, counters, and control registers within the bq26231. Use the memory map in the bq26231 data sheet for a guide to their individual uses. Simply enter the address and any data (for writes), and click the appropriate button. The control registers show the binary version below the address and data entry boxes to indicate the state of the device at that time. See Figure 4–4. 4.
Software Instructions Figure 4–4. Read/Write Regs.
Software Instructions Figure 4–5.
Data Logging 4.4 Data Logging The bq26231 registers data are logged by clicking the Turn Log On button of 26231 Registers screen. This creates a log file and shows the data on the 26231 Registers screen. See Figure 4–6 and Figure 4–7. Figure 4–6.
Data Logging Figure 4–7.
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