Fuel gauge IC provides runtime, age info

The STC3115  battery fuel-gauge IC uses 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. Aging and temperature compensation are built in, and the voltage measurement accuracy is 0.25%. An adaptive algorithm, OptimGauge, tracks the state of charge to correct the battery model and measures initial battery open-circuit voltage and prevents measurement disruptions when connecting the charger or launching an application.

The STC3115 battery fuel-gauge IC suits high-volume handheld electronics including smartphones, laptops and digital cameras. Additional features include a low-power mode that reduces operating current to only 0.45 µA 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. (From $0.95 ea/1,000 – available now.)