Silicon Labs' full range of touch solutions

Silicon Labs' TouchXpress family offers a highly optimized solution for easy capacitive design and integration into capacitive applications. Capacitive touch buttons can be used to quickly replace mechanical buttons and switches. This article will tell you the details about Silicon Labs' full range of touch solutions. 

A good capacitive touch controller should have the following features: simple firmware and hardware, low cost, low power consumption, high stability and easy configuration.

The Silicon Labs'CPT series capacitive touch controllers do not require the development of complex firmware. It can add stylish touch interface designs to a wide range of products, including control panels for home appliances, consumer electronics, lighting controls, medical devices and meters.

Silicon Labs has a comprehensive range of CPT series capacitive touch controllers to meet all aspects of design requirements. The specific models are as follows:

CPT007B-GM:7-channels, GPIO interface, QFN20 package

CPT007B-GU：7-channels, GPIO interface, QSOP24 package

CPT112S-GM:12-channels, I2C interface, QFN20 package

CPT112S-GU:12-channels,I2C interface,QSOP24 package

CPT212B-GM:12-channels,I2C interface,QFN20 package

CPT213B-GM:13-channels,I2C interface,QSOP24 package

As you can see from the above models, the interface of the CPT series device can be directly connected to the main MCU, and the configuration and data interface of the CPT device can be directly connected to the integrated development platform Simplicity Studio of Silicon Labs. 

This platform contains some feature modules:

1) Xpress Configurator: Easily configure the characteristic parameters of each sensor;

2) Capacitive Sense Profiler: Fully real-time monitoring of the capacitor output;

Different models are available for different project applications. Engineers can choose the model according to different project needs. The CPT212B highly integrated device supports up to 12 capacitive sensor inputs in a small 3 mm x 3 mm QFN package, which can be connected via I2C interface. Connect to the host processor to provide a simple solution for adding capacitive touch.

In addition, the chip also has the following characteristics:

• No firmware development required
• GUI-based simple configurator
• 12 capacitive sensor inputs with programmable sensitivity
• I2C interface to communicate with and configure from the host
• Lowest power capacitive sensing solution
• Active mode — 200 μA
• Sleep mode — 1 μA
• Close to wake up
• Excellent noise immunity: SNR up to 270:1
• Humidity immunity

• Buzzer output for audible touch feedback

Powerful hardware and software support combined with Silicon Labs CPT Series capacitive touch sensors help engineers eliminate firmware complexity and reduce development time.

Etikett: Silicon

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