this is information on a product in full production. january 2014 docid023755 rev 4 1/31 STC3115 gas gauge ic with alarm output for handheld applications datasheet - production data features ? optimgauge tm algorithm ? 0.25% accuracy battery voltage monitoring ? coulomb counter and voltage-mode gas gauge operations ? robust initial open-c ircuit-voltage (ocv) measurement at power up with debounce delay ? low battery level alarm output with programmable thresholds ? internal temperature sensor ? battery swap detection ? low power: 45 a in power-saving mode, 2 a max in standby mode ? 1.4 x 2.0 mm 10-bump csp package applications ? mobile phones, multimedia players, digital cameras ? portable medical equipment description the STC3115 includes the hardware functions 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 high performance gas gauging in all application conditions. csp (1.4 x 2.0 mm) www.st.com
contents STC3115 2/31 docid023755 rev 4 contents 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 absolute maximum ratings and operating c onditions . . . . . . . . . . . . . 4 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.1 battery monitoring functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.1.1 operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.1.2 battery voltage monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.1.3 internal temperature monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.1.4 current sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.2 STC3115 gas gauge architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.2.1 coulomb counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.2.2 voltage gas gauge algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6.2.3 mixed mode gas gauge system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.3 low battery alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 6.4 power-up and battery swap detection . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.5 improving accuracy of the initial ocv measurement with the advanced functions of batd/cd and rstio/batd pins . . . . . . . . . . . . . . . . . . . . . 17 6.5.1 batd and rstio pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7i 2 c interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 7.1 read and write operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 7.2 register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 7.2.1 register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 7.2.2 register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 8.1 flip chip csp 1.40 x 2.04 mm package information . . . . . . . . . . . . . . . . 26
docid023755 rev 4 3/31 STC3115 contents 31 9 ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 10 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
block diagram STC3115 4/31 docid023755 rev 4 1 block diagram figure 1. STC3115 internal block diagram $ 0 6 b 9 9 & |