AN4324 Datasheet, PDF (1/31 Pages) STMicroelectronics – STC3115 system integration

AN4324
Application note
STC3115 system integration
Aurelien Mazard
Introduction
Mobile application users demand accurate battery capacity monitoring. In particular, they are interested
to know if the battery state of charge (SOC) in stressful conditions is logical and accurate. To this end,
STMicroelectronics has developed a device (STC3115) which uses its internal algorithm to provide the
user with accurate and reliable information about the battery’s SOC. This tiny chip can be used in any
handheld electronic mobile phone or tablet. The purpose of this application note is to provide the basics
of how to build an accurate fuel gauge system using the STC3115.
A complete fuel gauge system is a combination of hardware and software functions. The STC3115 has
been designed to convert the physical nonlinear measurements of lithium-ion battery models to stable
and compensated information, which can easily be reported to the final user of a mobile application.
Chipset manages the real-time aspects of the battery gauging. It combines the voltage method and
coulomb counter to provide the best accuracy in every application state. The application software is
concerned with the reporting and calculation of application-dependent information.
November 2014
DocID024963 Rev 2.0
1/31
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