Touch sensing inputs and EEPROM
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The C8051F7xx family of high pin-count MCUs is Silicon Labs’ first MCU family to feature the patent-pending capacitance-to-digital converter (CDC), enabling you to easily replace traditional mechanical switches with capacitive touch sense capability in any product requiring a high performance, high pin-count MCU.
The C8051F700’s new touch sense capability is accurate, responsive, and reliable. The CDC will output samples with industry leading speed at 40 µs per sample and its new architecture is inherently immune to noise. This means sophisticated touch sense features such as buttons, wheels, and sliders that will operate with no apparent lag, delay, or false touches. Further, the new Human Interface Studio software GUI is an easy to use but powerful design tool that allows the customer to implement touch sense in minutes.
Capacitive touch sense feature enables button, slider and wheel functionality
Silicon Labs continues its leadership position in analog performance with a new capacitive touch sense peripheral. This peripheral uses a true capacitance-to-digital (CDC) converter enabling robust, accurate and responsive touch sense implementation, yet is easy to configure and use. You will want to know the following:
Highly responsive and accurate—the combination of high resolution CDC, 40 µs acquisition time and 25 MIPS CPU allow the implementation of high-quality and sophisticated touch sense functions in their end-products, even when large arrays of touch sense elements are used Robust performance—the CDC offers best-in-class noise immunity for reliable, worry-free performance in challenging conditions and configurations such as thick laminate overlays, electrical noise, or variances in PCB manufacturing that can affect the capacitance of a switch. A typical signal-to-noise (SNR) of 100 can be achieved in most applications.
Easy-to-use—an intuitive software GUI allows fast and easy configuration. An API library is provided for all common touch sense configurations such as virtual buttons, wheels and sliders. Auto-scan, threshold presets, and an accumulator allow the CDC to function with little CPU intervention and software overhead.
Wake-on-touch—the MCU can be placed in power saving modes, yet wake quickly upon a touch sense event, ultimately saving overall system power Industry leading number of inputs—supports up to 32 touch sensing inputs.
Up to 54 general purpose I/O
The C8051F700 is a high pin-count MCU with I/O that has the flexibility to be used as digital I/O, ADC voltage measurement inputs, capacitive touch-sense inputs and digital communications I/O. With the high-performance analog, fast CPU, and calibrated oscillator, the ‘F700 can make the best use of every pin for cost-optimized end applications.
Data EEPROM
The C8051F700 is the first Silicon Labs MCU to add data EEPROM with 100,000 cycle endurance guaranteed for storage of frequently updated end user settings and in-application calibration constants.
The C8051F700 Family is supported with the same, easy to use, low-cost development and evaluation tools offered with the other Silicon Labs MCU products. Getting these tools in the customer’s hands is essential to helping win the design. Further, the new capacitive touch sense technology is supported with a cool new keyboard evaluation kit that you can show customers as an easy to use demo.
Capacitive Touch Sense Evaluation Kit
The keyboard is an easy-to-use demonstration of the new
Silicon Labs capacitive touch sense peripheral in action.
The kit models a keyboard using capacitive touch sense,
and is easily demonstrated using a PC, such as your laptop.
You can evaluate the performance and tools develop your own touch sense interface.
The human interface studio is an intuitive
software GUI that is provided for fast and easy set up.
An API library is provided for all common touch sense
configurations such as virtual buttons, wheels, and sliders.