CPT007B TouchXpress Capacitive Touch Controllers Silicon Labs CPT007B TouchXpress™ Capacitive Touch Controllers with the GPIO interface are highly integrated devices that offer a simple solution for adding capacitive touch in new and legacy systems. The CPT007B TouchXpress controllers enable designers to quickly replace up to seven mechanical buttons with capacitive touch buttons. The TouchXpress devices eliminate firmware development, thereby decreasing the time needed to deliver products to market. Designers can configure all the required capacitive touch sense parameters using a simple GUI-based configurator. Rated at 200µA in active mode and 1µA in sleep mode, the CPT007B controllers quickly and easily deliver a low-power capacitive sense solution for embedded designs.