bq2014H
Low-Cost NiCd/NiMH Gas Gauge IC
Features General Description вћ¤ Accurate measurement of available capacity in NiCd or NiMH
batteries T he b q 2 0 1 4 H N iC d / N iM H G a s
Gauge IC is intended for batterypack or in-system installation to
maintain an accurate record of
available battery capacity. The IC
monitors a voltage drop across a
sense resistor connected in series
between the negative battery termina l a n d g r ou n d t o d e t e r m i n e
charge and discharge activity of
the battery. Compensations for battery temperature, self-discharge,
and rate of discharge are applied to
the charge counter to provide available capacity 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. вћ¤ Low-cost battery management solution for pack integration -As little as 1 2 square inch of
PCB for complete circuit -Low operating current (120ВµA
typical) -Less than 100nA of data
retention current вћ¤ High-speed (5kb/s) single-wire
communication interface (HDQ
bus) for critical battery …
