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Controllers promise to speed up capacitive sensing designs

11 Dec 2015

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Silicon Labs has rolled out a line-up of fixed-function controllers that the company said offers the fastest, easiest way to incorporate low-power capacitive touch interfaces to embedded designs. The CPT007B and CPT112S TouchXpress controllers aim to eliminate time-consuming firmware development, providing a simple turnkey solution for adding sleek, touch-based user interface designs to various products such as home appliances, white goods, consumer electronics, lighting control, medical equipment and instrument/control panels, detailed the company.

CPT007B TouchXpress evaluation board

CPT007B TouchXpress evaluation board

The CPT007B GPIO switch replacement device enables developers to quickly replace up to seven mechanical buttons with capacitive touch sensors with no firmware development. The GPIO interfaces provide direct on/off sensor status to the host processor.

The CPT112S capacitive sense I2C device features up to 12 sensor inputs to simplify the addition of capacitive sense functionality for touch-based interfaces. 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.

Both capacitive touch controllers support advanced features such as moisture immunity, wake-on proximity, touch time-out, mutually exclusive touch qualifier and buzzer feedback for an enhanced user experience. The CPT112S device also offers a slider control option.

Based on Silicon Labs' patented capacitive sensing technology, the TouchXpress controllers claim to provide best-in-class drop-in solutions that ease touch interface development for embedded designers of all skill levels. No firmware development, programming or capacitive sense expertise is needed to implement capacitive touch interfaces based on TouchXpress technology. No external components are required, and developers can easily configure and evaluate all capacitive sense parameters using Silicon Labs' simple, intuitive GUI-based Xpress Configurator and Capacitive Sense Profiler.

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