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Atmel QTouch Library
QTouch Library Peripheral Touch Controller
USER GUIDE
Description
Atmel® QTouch® Peripheral Touch Controller (PTC) offers built-in hardware
for capacitive touch measurement on sensors that function as buttons,
sliders, and wheels. The PTC supports both mutual and self-capacitance
measurement without the need for any external component. It offers superb
sensitivity and noise tolerance, as well as self-calibration, and minimizes the
sensitivity tuning effort by the user.
The PTC is intended for autonomously performing capacitive touch sensor
measurements. The external capacitive touch sensor is typically formed on a
PCB, and the sensor electrodes are connected to the analog charge
integrator of the PTC using the device I/O pins. The PTC supports mutual
capacitance sensors organized as capacitive touch matrices in different X-Y
configurations, including Indium Tin Oxide (ITO) sensor grids. In mutual
capacitance mode, the PTC requires one pin per X-line (drive line) and one
pin per Y-line (sense line). In self-capacitance mode, the PTC requires only
one pin with a Y-line driver for each self-capacitance sensor.
Features
•Implements low-power, high-sensitivity, environmentally robust
capacitive touch buttons, sliders, and wheels
•Supports mutual capacitance and self-capacitance sensing
•Up to 32 buttons in self-capacitance mode
•Up to 256 buttons in mutual capacitance mode
•Supports lumped mode configuration
•One pin per electrode - no external components
•Load compensating charge sensing
•Parasitic capacitance compensation for mutual capacitance mode
•Adjustable gain for superior sensitivity
•Zero drift over the temperature and VDD range
•No need for temperature or VDD compensation
•Hardware noise filtering and noise signal de-synchronization for high
conducted immunity
•Atmel provided QTouch Library firmware and QTouch Composer tool
Atmel-42195M-Peripheral-Touch-Controller_User Guide-07/2016
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | ATSAMDA1G14B |
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