AT42QT1010
AT42QT1010 - Evaluation Kit User's Guide
Preface
Important: Notice to customers:
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®
Introduction
The
AT42QT1010 Evaluation Kit
shows touch and proximity capabilities of the AT42QT series of touch
turnkey products.
The kit has one self-capacitance touch button with the option to connect an external sensing electrode
using SMD test pad (TP). An on-board LED indicates the touch status.
Recommended Reading
For the latest information on the device, refer to
https://www.microchip.com/wwwproducts/en/
AT42QT1010.
©
2018 Microchip Technology Inc.
User Guide
DS40002062A-page 1
AT42QT1010
Table of Contents
Preface............................................................................................................................ 1
1. Introduction................................................................................................................3
1.1.
1.2.
Features and Overview................................................................................................................ 3
Functional Block Diagram............................................................................................................ 3
2. Getting Started.......................................................................................................... 4
2.1.
2.2.
Quick Start....................................................................................................................................4
Touch Status LED.........................................................................................................................4
3. User Guide................................................................................................................ 5
3.1.
3.2.
Powering the Board......................................................................................................................5
Operation Modes..........................................................................................................................5
4. Documentation and Relevant Links...........................................................................6
5. Hardware Revision History and Known Issues..........................................................7
5.1.
5.2.
Identifying Product ID and Revision............................................................................................. 7
Revision 4.....................................................................................................................................7
6. Document Revision History ...................................................................................... 8
The Microchip Web Site.................................................................................................. 9
Customer Change Notification Service............................................................................9
Customer Support........................................................................................................... 9
Microchip Devices Code Protection Feature................................................................... 9
Legal Notice...................................................................................................................10
Trademarks................................................................................................................... 10
Quality Management System Certified by DNV.............................................................11
Worldwide Sales and Service........................................................................................12
©
2018 Microchip Technology Inc.
User Guide
DS40002062A-page 2
AT42QT1010
Introduction
1.
1.1
Introduction
Features and Overview
•
•
•
One Touch Sensor – configurable as either a single key or a proximity sensor (configurable
sensitivity)
Option to Connect External Sensing Electrode
Mode of Operations:
– Sync
– Normal
– Low Power
Technology: Spread-Spectrum Charge-Transfer (Direct mode)
Status LED to indicate Touch
On-Board Self-Capacitance Sensor
– size: 9x16 mm
USB Power Input
•
•
•
•
1.2
Functional Block Diagram
Figure 1-1. Functional Block Diagram
Sensor
Button
Self-
capacitance
Line
AT42QT1010
Power-in
Test Pin for
External Sensor
Sensor
Status
©
2018 Microchip Technology Inc.
User Guide
DS40002062A-page 3
AT42QT1010
Getting Started
2.
2.1
Getting Started
Quick Start
Figure 2-1. Quick Start
AT42QT1010
USB Connector
Mode Select
Sensor
Touch Status LED
2.2
Touch Status LED
By default, the LED will illuminate during power-up and will turn off upon touching the self-capacitance
key.
©
2018 Microchip Technology Inc.
User Guide
DS40002062A-page 4
AT42QT1010
User Guide
3.
3.1
User Guide
Powering the Board
The kit is powered from the micro-USB connector. The kit can be powered by connecting the micro-USB
cable to the USB connector on the board and to the computer.
On initial power-up, the QT1010 requires approximately 100 ms to power on, to allow power supplies to
stabilize. During this time, the OUT-pin state is not valid and should be ignored.
3.2
Operation Modes
The kit operates in three different operation modes, which depend on the state of the SYNC pin (High or
Low).
3.2.1
Fast Mode
The QT1010 runs in Fast mode if the SYNC pin is permanently high. In this mode, the QT1010 runs at
maximum speed at the expense of increased current consumption. Fast mode is useful when speed of
response is the prime design requirement. The delay between bursts (= touch scans) in Fast mode is
approximately 1 ms.
Low-Power Mode
The QT1010 runs in Low-Power (LP) mode if the SYNC pin is held low. In this mode, it sleeps for
approximately 80 ms at the end of each burst, saving power but slowing response. On detecting a
possible key touch, it temporarily switches to Fast mode until either the key touch is confirmed or found to
be spurious (via the detect integration process). It then returns to LP mode after the key touch is
resolved.
Sync Mode
It is possible to synchronize the device to an external clock source by placing an appropriate waveform
on the SYNC pin. SYNC mode can synchronize multiple QT1010 devices to each other to prevent cross-
interference, or it can be used to enhance noise immunity from low-frequency sources such as 50 Hz or
60 Hz mains signals. The SYNC pin is sampled at the end of each burst.
3.2.2
3.2.3
©
2018 Microchip Technology Inc.
User Guide
DS40002062A-page 5
