GG25LAJ STMicroelectronics

GG25L Gas gauge IC with alarm output Datasheet - production data 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 CSP (1.4 x 2.0 mm) 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 Features implementation of temperature compensation. TM OptimGauge algorithm An alarm output signals a low SOC condition and 0.25% accuracy battery voltage monitoring can also indicate low battery voltage. The alarm threshold levels are programmable. Coulomb counter and voltage-mode gas gauge operations The GG25L offers advanced features to ensure Robust initial open-circuit-voltage (OCV) high performance gas gauging in all application measurement at power up with debounce conditions. 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 Table 1. Device summary Order code Temperature range Package Packing Marking (1) GG25LJ O22 -40 C to +85 C CSP-12 Tape and reel (2) GG25LAJ O23 1. 4.35 V battery option 2. 4.20 V battery option February 2014 DocID025995 Rev 1 1/28 This is information on a product in full production. www.st.comContents GG25L Contents 1 Block diagram 3 2 Pin assignment . 4 3 Absolute maximum ratings and operating conditions . 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 IC 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 2/28 DocID025995 Rev 1