19-4829 Rev 1 8/09 DS2438EVKIT+ Smart Battery Monitor Evaluation Kit www.maxim-ic.com FEATURES EVALUATION KIT CONTENTS Demonstrates the Capabilities of the DS2438 1 pc. Evaluation Board Smart Battery Monitor, Including: 1 pc. DS9123O USB Port Adapter 1 pc. RJ-11 Cable Temperature Measurement Voltage Measurement Current Measurement EQUIPMENT NEEDED Current Accumulation 1. A PC running Windows XP or older operating Elapsed Time system and an available USB port. Information Storage 2. Cables with mini-grabber style clips or the ability Identification to solder directly to connection pads. Provides Small-Volume DS2438 Programming 3. A lithium-ion (Li+) battery and a power supply Support and/or load circuit. Interfaces to the USB Port of a PC Running Windows XP or Older Operating System ORDERING INFORMATION INDEX PART TYPE Evaluation Kit Contents DS2438EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Equipment Needed Introduction Setup and Installation Selecting the COM Port Real-Time Meters Setting the Elapsed-Time Meter End-of-Charge and Disconnect Timestamps Calibrating Current Measurements Setting the Current Accumulators Status/Configuration Register Data Logging Nonvolatile (NV) Memory Evaluation Board Schematic INTRODUCTION The DS2438 evaluation kit (EV kit) makes performance evaluation, software development, and prototyping with the DS2438 smart battery monitor easy. The evaluation board interfaces to a PC through a DS9123O USB adapter . and RJ-11 cable connection. All related data sheets can be found on our website at www.maxim-ic.com Resistor R1 on the evaluation board is a 50m current sense resistor. Resistor R2 and capacitor C1 implement the VSENS- lowpass filter recommended by the DS2438 data sheet. Component site R3, which is intentionally unpopulated, allows another sense resistor to be soldered down in parallel with or in place of resistor R1. Component site C3, intentionally unpopulated, allows a capacitor to be connected to the VAD input if needed. The evaluation board can be connected to a power supply and an external load in configurations that simulate either charging or discharging for the DS2438. Figure 1a below illustrates the charging configuration while Figure 1b shows the discharging configuration. Windows XP is a registered trademark of Microsoft Corp. 1 of 10 DS2438EVKIT+ EVALUATION BOARD DS2438EVKIT+ EVALUATION BOARD DS2438EVKIT+ Figure 1. Connections to Simulate Charging or Discharging BAT+ / PACK+ BAT+ / PACK+ VAD VAD + + BATTERY BATTERY PACK- PACK- - - LOAD BAT- BAT- LOAD Figure 1a. Charging Fig 1b. Discharging SETUP AND INSTALLATION Before starting the demonstration, connect the evaluation board to a power supply and a load as shown in Figure 1a or Figure 1b. Also, be sure that the evaluation board is connected to the DS9123O through the RJ-11 cable and that the DS9123O is plugged into a USB port on the computer. To install the DS2438 EV kit software, download the latest revision from our website at www.maxim-ic.com. Unzip the compressed folder and double-click the SETUP.EXE icon to begin the installation process. Follow the prompts to complete the installation. The DS2438 EV kit software can be uninstalled in the Add/Remove Programs tool in the Control Panel. After the installation is complete, open the DS2438K folder and run DS2438K.EXE or select DS2438K from the program menu. A splash screen containing information about the evaluation kit appears as the program is being loaded. SELECTING THE COM PORT The first time the software runs, the Select Preferences window may appear. In this window, select either serial port or USB communication and the port number then hit OK. The DS2438 EV kit software saves this port selection and automatically uses the selection each time the program starts. To change the port later, click the Preferences option on the menu bar, select Port Settings, and then select the appropriate port. To attempt to automatically locate the DS9123, click the Poll Ports button. Warning: automatically polling for the DS9123 can disrupt other devices connected to your computers COM ports. 2 of 10