this is information on a product in full production. february 2014 docid025995 rev 1 1/28 GG25L gas gauge ic with alarm output 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 ? wearable ? fitness and healthcare ? portable medical equipment description the GG25L includes the hardware functions required to implement a low-cost gas gauge for battery monitoring. the GG25L 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 GG25L offers advanc ed features to ensure high performance gas gauging in all application conditions. csp (1.4 x 2.0 mm) table 1. device summary order code temperature range package packing marking GG25Lj (1) -40 c to +85 c csp-12 tape and reel o22 GG25Laj (2) o23 1. 4.35 v battery option 2. 4.20 v battery option www.st.com
contents GG25L 2/28 docid025995 rev 1 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 GG25L 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 pins . . . . . . . . . . . . . . . 17 6.5.1 batd and rstio pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7 i2c 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 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
docid025995 rev 1 3/28 GG25L block diagram 28 1 block diagram figure 1. GG25L internal block diagram $ 0 6 b 9 9 & |