FEATURES
➤ Conservative and repeatable measurement of available charge in rechargeable batteries ➤ Designed for battery pack integration - 120µA typical standby current - Small size enables imple- mentations in as little as 1 2 square inch of PCB ➤ Integrate within a system or as a stand-alone device - Display capacity via single- wire serial communication port or direct drive of LEDs ➤ Measurements compensated for current and temperature ➤ Self-discharge compensation using internal temperature sensor ➤ Accurate measurements across a wide range of current (> 500:1) ➤ 16-pin narrow SOIC GENERAL DESCRIPTION
NiMH and NiCd battery self-discharge is estimated based on an internal timer and temperature sensor. Compensations for battery temperature and rate of charge or discharge are applied to the charge, discharge, and self-discharge calculations to provide available charge information across a wide range of operating conditions. Battery capacity is automatically recalibrated, or “learned,” in the course of a discharge cycle from full to empty.
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