Microchip ATSAMDA1J14B Manual

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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
Product Support
For assistance related to QTouch capacitive touch sensing software libraries and related issues, contact
your local Atmel sales representative or log on to myAtmel Design Support portal to submit a support
request or access a comprehensive knowledge base.
If you do not have a myAtmel account, please visit http://www.atmel.com/design-support/ to create a new
account by clicking on in the myAtmel menu at the top of the page.Create Account
When logged in, you will be able to access the knowledge base, submit new support cases from the
myAtmel page or review status of your ongoing cases.
Atmel QTouch Library Peripheral Touch Controller [USER GUIDE]
Atmel-42195M-Peripheral-Touch-Controller_User Guide-07/2016
2

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Kategori: Ikke kategoriseret
Model: ATSAMDA1J14B

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