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.

Supporting up to 12 capacitive sensor inputs in a 3 mm x 3 mm QFN package, the

CPT112S is a highly-integrated device that interfaces via I2C to the host processor to

provide a simple solution for adding capacitive touch. The device also comes with ad-

vanced features like moisture immunity, wake-on proximity, and buzzer feedback for an

enhanced user experience. No firmware development is needed, and all the capacitive

touch sense parameters can be configured using a simple GUI-based configurator. By

eliminating the need for complex firmware development, the CPT112S device enables

rapid user interface designs with minimal development effort.

The CPT112S device is ideal for a wide range of capacitive touch applications including

the following:

KEY 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 — 200 µA

• Sleep — 1 µA

• 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

• Home appliances

• Instrument / Control panels

• White goods

• Medical equipment

• Consumer electronics

• Lighting control

Input

Features

Output

Features

Capacitive Touch Sensing

Features

Baselining

Low Power State

Machine

Configuration

Profile for each

Input

Touch Time-Out

Timer

Touch

Qualification

Mutually-

Exclusive Touch

Qualifier

Input Engine

with

12 Inputs

Proximity Wake

Input

Option for a

Multi-Button

Slider

Optimized Active

Lowest power mode with feature operational:

Active

Optional Buzzer

Output

I2C Output

I2C Event Buffer

Interrupt Pin

Low Power Sleep

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Preliminary Rev. 0.1

This information applies to a product under development. Its characteristics and specifications are subject to change without notice.