DS2762K ,Li+battery monitor evaluation kit DS2762K Li+ Battery Monitor Evaluation Kit
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DS2762K
Li+battery monitor evaluation kit
GENERAL DESCRIPTION The DS2762K evaluation kit makes performance evaluation, software development, and prototyping
with the DS2762 Lithium-Ion (Li+) battery monitor easy. The evaluation board interfaces to a PC
through a DS9123 serial-port adapter and RJ-11 cable connection. The provided CD ROM contains all
related data sheets along with the evaluation software, which can be run under any Windows®
operating system.
The DS2762K evaluation software gives the user
complete control of all functions of the DS2762. Separate control tabs allow the user access to all
EEPROM and RAM memory locations, all control registers, and real-time updates of all monitored
parameters. The software also incorporates a data-logging feature to monitor a cell over time and fuel-
gauging algorithms to improve remaining capacity calculations based on specific cell characteristics.
The evaluation board circuit is designed to provide the DS2762 with accurate parameter measurements,
allow the DS2762 to disable charging or discharging, and protect the DS2762 from ESD damage. Kit
demonstration boards will vary as they are improved upon over time. For information on the demonstration
board circuits, refer to the individual board data sheets located inside the documentation
directory on the DS2762K CD ROM.
Windows is a registered trademark of Microsoft Corp.
FEATURES ��Demonstrates the Capabilities of the DS2762
Li+ Battery Monitor, Including: Temperature Measurement
Voltage Measurement
Current Measurement
Current Accumulation
Temperature and Accumulated Current Alarms
Information Storage
Identification
Overvoltage/Undervoltage Protection
Overcurrent/Short-Circuit Protection
��Interfaces to the Serial Port of a PC Running
Windows OS
INDEX
Setup and Installation Board Connections
Software Installation Selecting the COM Port
Program Menus Register Windows
Program Tabs Real-Time Meters
Data Logging User Memory
Pack Information Fuel Gauging
EVALUATION KIT CONTENTS 1–2 pc. TSSOP or CSP Evaluation Boards of
different varieties 1 pc. DS9123 Serial-Port Adapter
1 pc. RJ-11 Cable 1 pc. DS2762K CD containing:
DS2762K Evaluation Software DS2762 Related Documentation
EQUIPMENT NEEDED 1) A PC running Windows OS with a CD ROM drive
and an available serial port. 2) Cables with mini-grabber-style clips or the ability
to solder directly to connection pads. 3) A Li+ battery and a power supply and/or load
Li+ Battery Monitor Evaluation Kit
DS2762K Li+ Battery Monitor Evaluation Kit RJ-
DS2762 INFORMATION For more information about the DS2762, refer to the DS2762 data sheet available on our website at
/DS2762.
SETUP AND INSTALLATION
Board Connections Connections to the TSSOP demonstration board are best made either by soldering directly to the pads or by using
cables with mini-grabber clips. Soldering directly to the pads best makes connections to the CSP board. Communication to the TSSOP board can be accomplished either through the RJ-11 jack by connecting the
provided standard six conductor RJ-11 cord, or by wiring directly to the DQ and PAC- pads. In the latter case, the size of the board can be reduced by snapping off the RJ-11 jack along the break line (see Figure 1). To use the
demonstration software, the DQ and PAC- lines must be connected to the DS9123 communication brick using either of the two methods described.
Figure 1. Communication Connections
Figures 2a and 2b show the recommended circuits to simulate charging and discharging. The Li+ cell is connected between the BAT+ and BAT- pads. The battery charger/power supply or circuit load is connected between the
PAC+ and PAC- pads. The evaluation software can be run in either configuration as long as a cell is connected between the BAT+ and BAT- terminals, providing a minimum of 2.5V to power the DS2762. Some board versions
also have connections for the PS and PIO pins. Refer to the data sheet for the operation of these pins. Leaving them unconnected does not interfere with the operation of the demonstration board.
Figure 2a. Charging Circuit
Figure 2b. Discharging Circuit
SOFTWARE INSTALLATION To install the DS2762K software, exit all programs currently running and insert the DS2762K software CD into your computers CD ROM drive. Double click the SETUP.EXE icon and the installation process begins. Follow the
prompts to complete the installation. The DS2762K software can be uninstalled in the Add/Remove Programs tool in the Control Panel. After the installation is complete, open the DS2762K folder and run DS2762K.EXE or select
DS2762K from the program menu. A splash screen containing information about the evaluation kit appears as the program is being loaded. The Documentation directory also located on the CD contains all relevant data sheets
POWER
SUPPLY/
BATTERY
CHARGER
LOAD
DS2762K Li+ Battery Monitor Evaluation Kit
SELECTING THE COMMUNICATION PORT The first time the software runs, the Select Preferences window appears. In this window, select either serial port or
USB communication and the port number; then hit OK. The DS2762K 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 Serial Ports button.
Warning: Automatically polling for the DS9123 can disrupt other devices connected to your computers COM ports.
MENUS Several pull-down menu options have been provided to simplify use of the DS2762K software. Their functions are
individually detailed below.
File Menu The File Menu allows the user to store information from a file directly into the Device Setup, Battery Data, and Fuel-Gauging Data sections under the Pack Info Tab, or take the same Pack Information and store to a file. These functions do not directly write or read the DS2762. It is still necessary for the user to store or recall this information
to or from the device by issuing a WRITE or READ command under the Pack Info Tab.
Registers Menu The Registers Menu gives immediate access to all four status and function registers of the DS2762. Selecting any
of the registers will open an individual control window giving the user a description of each register bit and the ability to read or write it. See the status register window example.
DS2762K Li+ Battery Monitor Evaluation Kit
Status Register The present state of all register bits is displayed immediately upon opening the register window. R/W locations contain a selection field to allow the user to determine their state. Pressing either the APPLY or OK button in the
EEPROM Register or Special Feature Register windows will automatically update and read the corresponding register inside the DS2762. The Protection and Status registers have default values stored in user EEPROM
addresses 0x30h and 0x31h, respectively. Their windows contain extra options to write or read these locations independently of their registers.
Preferences Menu The Preferences Menu allows the user to change COM port settings at any time. Edit Preferences opens the Select
Preferences window. See Selecting the communication port above.
Help Menu Selecting the About topic from the Help Menu opens a window containing information about the current revision of
this program and Dallas Semiconductor.
DS2762K Li+ Battery Monitor Evaluation Kit
PROGRAM TABS All functions of the program are divided under five tabs in the main program window. Left click on the appropriate
tab to move to the desired function page. Located under the Meters tab is information on real-time updates measured by the DS2762: voltage, current, accumulated charge, temperature, alarms, and all error flags. The Data
Log tab allows the user to store all real-time information including protection register state to a file. The Memory tab displays the contents of every register and memory location inside the DS2762 and allows the user to alter the
data. The Pack Information tab gives the user the ability to assign a default device configuration and store that information to the DS2762 and/or a file. The Fuel Gauging tab uses the cell characterization information stored
under Pack Info to maintain a high-accuracy-remaining capacity indicator.
Meters Tab The Meters Screen displays the latest real-time measurements of cell voltage, temperature, current, and accumulated charge with both analog meter readouts and digital values. The sense resistor value used to calculate
the current reading is shown in the current section. Left click on it or go to the sense resistor sub-tab under Pack Info to change this value. The Calibrate Offset button in the current section allows the user to zero the current
measurements under the conditions of their circuit. Left clicking this button will begin the automatic calibration procedure. Calibration should be performed while the pack is disconnected and there is no current flow. The next
32 readings will be averaged and the offset eliminated by adjusting the Current Offset Register (location 0x33h) automatically. The process takes approximately 20 seconds. The user can bring up the Update Current Accumulator window by left clicking the Set ACR button. This window
allows the user to enter values for the Current Accumulator Register and Rated Battery Capacity in mAH. Rated Battery Capacity is used to determine full-scale range on the Charge Remaining Meter only. It has no affect on
device operation.
The present states of the Charge Control and Discharge Control pins are shown at the bottom left of the window.
These outputs are active low and drive two control FETs allowing charging and discharging of the cell pack. The Charge Control pin can be controlled manually by left clicking the Disable/Enable Charging button and will be
DS2762K Li+ Battery Monitor Evaluation Kit
also be controlled manually with the Disable/Enable Discharging button and will be forced high automatically by
either an undervoltage or discharge-overcurrent condition. The present state of each of the four possible flag conditions (Overvoltage, Undervoltage, Charge Overcurrent, and Discharge Overcurrent) is represented by LEDs
inside the voltage and current sections of the window. The corresponding LED will be green while the flag is in the cleared state. If conditions cause a flag to be tripped, the LED will turn red and a button will appear that allows the
user to clear the flag provided clear conditions have been met. If conditions for clearing the flag have not been met by the circuit, clicking the clear button will have no effect.
The bottom right side of the screen shows the alarm settings. Press the corresponding Set button to enter high and low values for Temperature and Accumulated Current. When the temperature or accumulated current exceed any
of the alarm values, the alarm indicator is displayed. The alarm indicator is a read of the PIO bit, which doubles as the alarm bit when enabled.
Datalog Tab The Datalog tab allows the user to see the DS2762s parameter measurements graphed over time. There are separate sub-tabs for voltage, current, temperature, and accumulated charge. Each graph displays the last 500
data points collected by the DS2762K software. The sampling interval can be adjusted from as fast as possible to
15 minutes and can be adjusted from the Sampling Interval Menu at the bottom of the window. The Clear Graphs button will clear all data from all four graphs, but does not reset the log to file function.
The Log to File sub-tab contains control information for storing all log data to an ASCII file. The default filename is c:\DS2762K_datalog.txt, but can be modified in the filename text field. The Log Data button toggles data logging off
and on. Data will be stored at the same interval selected for updating the graphs in the tab-delimited format of
Time
VoltageCurrentTemperatureCAProtection Register
for easy import into a spreadsheet. The most recent 50 samples are displayed in the window for observation. Warning: The Log Data function overwrites previous file information. Data previously stored in the file will be lost.
