The PAC1944 Click Board™ is a compact add-on board that contains an energy monitoring solution. This board features the PAC1944, a Microchip Technology multi-channel DC power/energy monitor. It uses real-time calibration to minimize offset and gain errors with no input filters required for this device. One prominent feature of the PAC1944 design is a set of digital comparators that allows the user to detect over/under voltage, over/undercurrent, and overpower against user-programmed limits for each channel and generate an alert when the threshold is exceeded. This Click Board™ performs power calculations and energy accumulation, enabling energy monitoring with integration periods up to one year or longer.