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Maxim > Design Support > Technical Documents > Application Notes > Temperature Sensors and Thermal Management > APP 4192
Keywords: DS2784,2784,thermal protection,temperature control,fuel gauge,gas gauge,battery monitor,lithium
ion,li+,battery protection,stand-alone
APPLICATION NOTE 4192
Adding Thermal Protection to the DS2784 Stand-
Alone Fuel Gauge
Mar 26, 2008
Abstract: The DS2784 stand-alone fuel gauge provides overvoltage and overcurrent protection to lithium-ion
(Li+) batteries. Some newer Li+ applications, however, also necessitate thermal protection. This application
note illustrates how to implement programmable temperature control by adding a MAX6506 temperature
sensor and a MAX4613 analog switch to the typical DS2784 application circuit. Full functionality of the DS2784
is maintained with the additional components.
Introduction
The DS2784 stand-alone fuel gauge provides precision voltage, temperature, and current measurements, as
well as a built-in SHA-1 authentication algorithm. The integrated safety circuitry protects lithium-ion (Li+)
batteries from overvoltage, undervoltage, overcurrent, and short-circuit faults. For an additional level of safety,
programmable thermal protection can be added to the typical application circuit with a MAX6506 dual-
threshold temperature switch and a MAX4613 quad SPST analog switch. Figure 1 shows the application
circuit with these additional ICs.
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