MIKROE Charger Click carries both a battery charger controller and a battery charge monitor, along with a battery connector. The smaller chip is MCP73831, a miniature single-cell Li-Ion and Li-Polymer charge management controller with a programmable charge current from 15 to 250 mA. The larger IC is DS2438, a smart battery monitor which integrates a temperature sensor, a timer, an ADC to measure the battery voltage and current, and a current accumulator that monitors the total amount of current going into and out of the battery. Charger Click communicates with the target MCU through a 1-Wire interface. Charger Click is designed to use a 5V power supply.