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ST's Fuel Gauge IC ready for mobile runtimes

19 Feb 2013

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OptimGauge

Semiconductor manufacturer STMicroelectronics has recently unveiled its latest battery fuel-gauging device featuring patented innovations that improving long-term accuracy. The STC3115 can be used in high-volume handheld electronics, and has already been selected by Samsung for some of its recent smartphones.

To enhance fuel-gauging accuracy, ST has combined several important advances in its latest adaptive fuel-gauge IC. Until now, leading devices have used Coulomb counting to monitor energy entering and leaving the battery, and periodic voltage-mode state-of-charge measurements to adjust the Coulomb counter for accuracy. It uses both sets of measurements continuously, with OptimGauge, an adaptive algorithm that tracks the state of charge and corrects the battery model.

The STC3115 further 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. Ageing and temperature compensation are built in, and the voltage measurement accuracy is 0.25 per cent.

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. An Under-Voltage Lockout (UVLO) filter prevents short-term fluctuations in battery voltage from causing unwanted system resets. In addition, it saves bill-of-materials costs by operating directly from the battery voltage without requiring its own voltage regulator.

The STC3115 is in full production in a 1.4 x 2.0mm chip-scale package, priced from $.95 in quantities of 1,000 pieces. If your company has high-volume requirements please contact your local ST sales office.

Datasheet for the STC3115 can be found here.




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