Cypress Capsense Express Capacitive Touch Sensing Controller solutions make button replacement easy by eliminating unnecessary software tools, firmware development, device programming, and system tuning. Cypress CapSense Express delivers a register configurable device which does not require firmware or device coding, and is enabled with the Cypress SmartSense Auto-Tuning algorithm, eliminating the need to manually tune the user interface. The controller supports 10 capacitive sensing buttons and 10 GPOs. Unregulated battery operation is available due to a voltage range of 1.71 to 5.5V and ultra low power consumption in both run and sleep modes. Additional features include noise immunity to radiated and conducted noise, and flanking sensor suppression to maintain robust sensing while using closely spaced buttons.