This reference design demonstrates an ultra-low-power capacitive touch panel based on a single MSP430™ microcontroller (MCU) with CapTIvate™ technology. The use of self and mutual capacitance technology enables multifunctional capacitive touch panels (buttons and proximity sensor) for eLocks and other applications with various human interfaces available. This reference design also demonstrates how to extend battery life by duty cycling the MSP430 CPU and switch between low-power mode and active mode.