Linear Technology introduces the LTC4150, a bi-directional Coulomb counter designed to measure battery capacity in handheld PC and portable product applications. The device monitors the current through a small sense resistor between the battery and its load or charger circuit. The LTC4150 indicates the charge and discharge of the battery through a series of output pulses over a single communication pin that can be counted by a microcontroller. Requiring an external sense resistor and a filter capacitor, the LTC4150 in the 10-pin MSOP package provides a way to monitor battery charge activity. The device provides a series of output pulses and a polarity signal to the microcontroller. The system can then count down from the fully charged state and estimate the battery's remaining capacity at any time during the charging or discharging of the battery. Other features include: ± 50 mV sense voltage range; precision timer capacitor or crystal not required; 2.7 V to 8.5 V operation; 32.55 Hz/V charge count frequency; 1.5 uA shutdown current.
www.linear.com; (408) 432-1900