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Battery Monitoring

ST’s battery fuel gauge ICs can be located in the battery pack or in the handheld device and integrate functions to monitor the battery voltage, current and temperature. Using a built-in Coulomb counter, these fuel gauge ICs calculate battery charge and store the data in 16-bit resolution for retrieval by the system controller. Access is via an industry-standard I²C interface, enabling the controller to create an accurate graphical representation of the remaining battery-operating time.

Battery-monitoring fuel gauge ICs combine a small footprint with outstanding measurement accuracy and extremely low power consumption to increase battery runtime and lifespan in mobile phones, multimedia players, digital cameras, and other space-constrained portable gadgets.

GG25L: battery charge indicators – or fuel gauges

Battery charge indicators – or fuel gauges - have become essential for managing devices such as smartphones, laptops or tablets. Accurate “time-remaining” predictions enhance the user’s experience, and can be critical in certain types of portable electronics such as medical devices. Even so, many of today’s fuel-gauging electronics are susceptible to errors caused by battery aging, reduced charging efficiency, leakage, variations in system power demand, and temperature effects. The GG25L enhances accuracy by measuring true initial battery open-circuit voltage and preventing measurement disruptions when connecting the charger or launching an app. The charging inhibitor is a patented feature that significantly improves accuracy. Aging and temperature compensation are built in, and the voltage measurement accuracy is 0.25%.
Additional value-added features of the new IC include a low-power mode that reduces operating current to only 0.45µA while continuing to monitor the battery, and a 2µA standby mode. 
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