The HY4141 ICs are tiny, micropower current fuel gauges for lithium-ion (Li+) batteries in handheld and portable equipment. The HY4141 operates with a single lithium cell. The ICs use the sophisticated Li+ battery-modeling algorithm Gauge to track the battery relative state-of charge(SOC) continuously over widely varying charge and discharge conditions. The Gauge algorithm eliminates current-sense resistor and battery-learn cycles required in traditional fuel gauges. Temperature compensation is implemented using the system microcontroller:

• No learning cycles needed so the accumulated errors won’t happen
• The production cycle time and overall cost can be minimized
• MTP Memory provides the power saving advantage
• Support I²C Protocol
• Simplified peripheral parts on the PCB