TouchXpress™ Family
CPT112S Data Sheet
The CPT112S device, part of the TouchXpress family, is designed
to quickly add capacitive touch via an I2C interface by eliminating
the firmware complexity and reducing the development time for ca-
pacitive sensing applications.
KEY FEATURES
• No firmware development required
• Simple GUI-based configurator
• 12 Capacitive Sensor inputs with
programmable sensitivity
Supporting up to 12 capacitive sensor inputs in packages as small as a 3 mm x 3 mm
QFN, the CPT112S is a highly-integrated device that interfaces via I2C to the host pro-
cessor to provide a simple solution for adding capacitive touch. The device also comes
with advanced features like moisture immunity, wake-on proximity, and buzzer feedback
for an enhanced user experience. No firmware development is needed, and all the ca-
pacitive touch sense parameters can be configured using a simple GUI-based configura-
tor. By eliminating the need for complex firmware development, the CPT112S device en-
ables rapid user interface designs with minimal development effort.
• Configurable multi-button slider
• I2C interface to communicate to the host
• Lowest power capacitive sense solution
• Active — 200 µA
• Sleep — 1 µA
• Wake on proximity
• Superior noise immunity: SNR up to 270:1
• Moisture immunity
The CPT112S device is ideal for a wide range of capacitive touch applications including
the following:
• Mutually-exclusive touch qualifier
• Medical equipment
• Home appliances
• Button touch time-out to avoid false
touches
• Consumer electronics
• Instrument / Control panels
• Buzzer output for audible touch feedback
• Lighting control
• White goods
Input
Features
Capacitive Touch Sensing
Features
Output
Features
Mutually-
Touch
Proximity Wake
Input
Exclusive Touch
Qualification
I2C Output
I2C Event Buffer
Qualifier
Option for a
Multi-Button
Slider
Configuration
Profile for each
Input
Optional Buzzer
Output
Baselining
Interrupt Pin
Input Engine
with
12 Inputs
Low Power State
Machine
Touch Time-Out
Timer
Lowest power mode with feature operational:
Active Optimized Active
Low Power Sleep
silabs.com | Smart. Connected. Energy-friendly.
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Preliminary Rev. 0.2