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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
Smart Battery Monitor, Including:
? Temperature Measurement
? Voltage Measurement
? Current Measurement
? Current Accumulation
? Elapsed Time
? Information Storage
? Identification
Provides Small-Volume DS2438 Programming
Support
Interfaces to the USB Port of a PC Running
1 pc. Evaluation Board
1 pc. DS9123O USB Port Adapter
1 pc. RJ-11 Cable
EQUIPMENT NEEDED
1. A PC running Windows XP or older operating
system and an available USB port.
2. Cables with mini-grabber style clips or the ability
to solder directly to connection pads.
3. A lithium-ion (Li+) battery and a power supply
and/or load circuit.
Windows XP ? or Older Operating System
ORDERING INFORMATION
INDEX
Evaluation Kit Contents
PART
DS2438EVKIT+
TYPE
EV Kit
Equipment Needed
+ Denotes lead(Pb)-free and RoHS compliant.
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.
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