STMicroelectronics has extended and enhanced its STMTouch capacitive touch-sensing firmware library, allowing designers to add advanced user-interface features to applications using 8-bit STM8 microcontrollers.
The second-generation STMTouch firmware now supports over 200 STM8 part numbers, including the advanced STM8S family and the STM8L, featuring ultra low-power EnergyLite technology. Another new feature is support for touch detection via charge-transfer, which delivers high sensitivity and robustness. In addition, simultaneous channel acquisition reduces CPU usage to help designers optimise application features and power consumption. The library also provides improved wheel and slider controls that feature 256-level resolution while using only three microcontroller I/Os as sensor channels. Touch controls implemented using the STMTouch firmware library occupy a low memory footprint and require minimal use of STM8 peripherals, allowing developers to consolidate user-interface and application tasks in a single device.
To complement the enhanced second-generation firmware, the STMTouch development platform adds a new evaluation board supporting the STM8L family and also features STM Studio software which enables developers to tune touch-sensing parameters. STM Studio is a PC-based tool offering an easy-to-use GUI that provides visual indication of sensor responses. The development platform also features an STM8S evaluation board, as well as the API description, application notes, code examples and layout recommendations for production boards. C-compiler support has also been expanded, as the latest release is compatible with Cosmic, IAR and Raisonance compilers.
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