DS2760PALM
Fuel Pack Demonstration Software for
Palm III and m100 PDAs
www.maxim-ic.com
INTRODUCTION
Dallas Semiconductor鈥檚 battery management support
products allow the user to validate fuel gauging and power
control within their product without committing significant
resources to the task. Fuel gauging software is available for
evaluation purposes on both the PC and PALM platforms as
well as ANSI C source code capable of running within the
target application. Developing a typical DS2760-based
application usually involves the integration of the DS2760
into the battery pack, configuration of the device using the
DS2760K Li
+
Battery Monitor Evaluation Kit, and
performance evaluation using the DS2760K software on the
PC or PALM handheld. The final phase of the development
involves the integration of the fuel gauging function into the
end equipment.
The PALM platform is a convenient vehicle for portably
monitoring state-of-charge of the user鈥檚 target rechargeable
system. The DS2760 Fuel Pack software runs on either
Palm III or Palm m100 PDAs and communicates to a
DS2760 through the Palm鈥檚 Hotsync port using a specially
modified DS9123. It then displays relevant cell information
to the user.
PARAMETER DISPLAY
Figure 1
SETUP AND INSTALLATION
The DS2760 Fuel Pack is a standard Palm-executable that can be downloaded through either the Hotsync
port or infrared link of the PDA. For proper operation, the program must communicate to a DS2760
through a specially modified DS9123 brick attached to the Hotsync port (See the appendix for
modification details), and characterization data for the monitored cell must already be stored in the
DS2760鈥檚 EEPROM. Cell characterization data is discussed in detail in Application Note 131: Lithium-
Ion Fuel Gauging with Dallas Semiconductor Devices, and a memory map of how the cell data is stored
can be found in the DS2760K demonstration kit datasheet. Once Fuel Pack is loaded onto the PDA and a
DS2760 is connected through a DS9123 to the Hotsync port, tap the Fuel Pack icon to execute the
program. Cell characterization data is read from the DS2760 only at the start of the program; therefore, to
ensure accurate readings, the program must be restarted each time the cell pack being monitored is
changed.
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