PAC1921 High-Side Power/Current Monitor Microchip Technology PAC1921 High-Side Power/Current Monitor is a dedicated power-monitoring device with a configurable analog output of 3V, 2V, 1.5V, or 1V. The PAC1921 monitor can present power, current, or voltage and is designed for power measurement and diagnostic systems. Measurements are accumulated in large lossless registers that allow for integration periods from 500μs to 2.9 seconds.