STC3115 Gas gauge IC with alarm output for handheld applications Datasheet - production data Applications Mobile phones, multimedia players, digital cameras Portable medical equipment Description The STC3115 includes the hardware functions PP PP &63 required to implement a low-cost gas gauge for battery monitoring. The STC3115 uses current sensing, Coulomb counting and accurate measurements of the battery voltage to estimate the state-of-charge (SOC) of the battery. An internal temperature sensor simplifies implementation of temperature compensation. An alarm output signals a low SOC condition and can also indicate low battery voltage. The alarm threshold levels are programmable. The STC3115 offers advanced features to ensure )1 PP PP high performance gas gauging in all application conditions. Features OptimGauge algorithm 0.25% accuracy battery voltage monitoring Coulomb counter and voltage-mode gas gauge operations Robust initial open-circuit-voltage (OCV) measurement at power-up Programmable low battery alarm Internal temperature sensor Battery swap detection Low power: 45 A in power-saving mode, 2 A max. in standby mode Micro-sized packages: 1.4 x 2.0 mm 10-bump CSP package 2.0 x 3.0 mm DFN10 package January 2018 DocID023755 Rev 9 1/35 This is information on a product in full production. www.st.comContents STC3115 Contents 1 Block diagram 4 2 Pin assignment . 5 3 Absolute maximum ratings and operating conditions . 6 4 Electrical characteristics . 7 5 Application information . 10 6 Functional description 12 6.1 Battery monitoring functions . 12 6.1.1 Operating modes 12 6.1.2 Battery voltage monitoring . 12 6.1.3 Internal temperature monitoring . 13 6.1.4 Current sensing . 13 6.2 STC3115 gas gauge architecture . 14 6.2.1 Coulomb counter 14 6.2.2 Voltage gas gauge algorithm . 15 6.2.3 Mixed mode gas gauge system . 16 6.3 Low battery alarm . 17 6.4 Power-up and battery swap detection . 18 6.5 Improving accuracy of the initial OCV measurement with the advanced functions of BATD/CD and RSTIO pins 19 6.5.1 BATD and RSTIO pins 19 6.6 . 20 7 I2C interface . 21 7.1 Read and write operations 21 7.2 Register map 23 7.2.1 Register map . 23 7.2.2 Register description 25 8 Package information 27 2/35 DocID023755 Rev 9