Silicon Labs CPT112S TouchXpress™ Capacitive Touch Controller is a highly-integrated device that offers a simple solution for adding capacitive touch in new and legacy systems. The CPT112S controller supports up to 12 capacitive sensor inputs and uses an I2C interface to communicate to the host processor. As part of the TouchXpress family, the CPT112S is designed to easily replace mechanical buttons with capacitive touch buttons. The TouchXpress devices eliminate the need for firmware development, thereby decreasing the time it takes 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 CPT112S controller quickly and easily delivers a low-power capacitive sense solution for embedded designs.

Advanced features include wake-on proximity, moisture immunity, touch time-out, mutually-exclusive touch qualifier, buzzer feedback, and a slider control option. The I2C interface provides an easy way to track the status of touch sensors, and an interrupt pin can wake the  host processor from sleep after a proximity touch detection.

Available in a 3mm x 3mm QFN package, the CPT112S is ideal for home appliances, instrument/control panels, medical equipment, consumer electronics, white goods, and lighting control.

Features

• No firmware development required

• Simple GUI-based configurator

• 12 Capacitive Sensor inputs with programmable sensitivity

• Configurable multi-button slider

• I2C interface to communicate to the host

• Lowest power capacitive sense solution

  • Active — 200μA

  • Sleep — 1μA

  
  

• Wake on proximity

• Superior noise immunity: SNR up to 270:1

• Moisture immunity

• Mutually-exclusive touch qualifier

• Button touch time-out to avoid false touches

• Buzzer output for audible touch feedback

Applications

• Home appliances

• Instrument/Control Panels

• Medical equipment

• Consumer electronics

• White goods

• Lighting control

Features Diagram