SmartSense auto-tuning ends the need to manually tune the user interface during development and production ramp. This speeds the time to volume and saves valuable engineering time, test time, and production yield loss. The device supports up to 16 capacitive touch buttons that can be organized in any format. With its backward compatible key scan interface, it can enable users to achieve quick-to-market (retrofit) designs in large keypad applications such as fire alarm control panels, security systems, and door locks. Any application that requires up to 16 CapSense buttons can utilize CY8CMBR2016. In addition, this device also supports many advanced features, which enhance the robustness and user interface of the end solution. Some of the key advanced features include Noise Immunity and FSS. Noise Immunity improves the immunity of the device against radiated and conducted noise, such as audio and radio frequency (RF) noise. FSS provides robust sensing even with closely spaced buttons. FSS is a critical requirement in small form factor applications.