Datasheet

5
Microchip Human Interface Solutions
mTouch Sensing Solutions: Touch Screen Controllers
www.microchip.com/mtouch
Microchip offers a broad portfolio of advanced touch
solutions for projected capacitive and resistive touch
screen applications with the following advantages:
■ High Flexibility: Royalty free source code model,
increased design fl exibility with options to integrate
touch sensing with application code on a single
MCU, low cost, low power solutions to reduce total
system cost.
■ Sophisticated: Advanced touch screen solutions use
sophisticated proprietary touch screen decoding
algorithms to send your application fully processed
and reliable touch coordinates.
■ Easy Integration: Designers can add touch screen
technology to their application without extensive
development time, risk or cost.
Projected Capacitive vs. Resistive
Microchip presents both projected capacitive and resistive
touch solutions to allow designers to choose the best fi t for
their touch screen design.
■ Projected capacitive technology provides high
durability, good optics and multi-touch capability
which enable gestures.
■ Resistive touch is a good choice for a low cost,
easy to integrate solution that accepts fi nger,
stylus or glove input.
Touch Sensing Technology Comparison
Analog
Resistive
Projected
Capacitive
Cost for screen < 6" Lowest Low
Cost for screen > 10" Lowest High
Optics 75% 90%
Screen Life Good Better
Ease of Integration Easy Moderate
Multi-Touch Limited Yes
Touch Object
Finger, Stylus/
Glove
Finger
Analog Resistive Technology
Microchip’s AR1000 Series Key Features
■ Frees host from burden of touch data processing
■ Enables supply chain optimization via universal sensor
support
• Turnkey touch solution
• Built-in decoding and advanced fi ltering—
no touch code to write
• Power-saving sleep and external wake up modes
• Universal 4, 5 and 8 wire sensor support
• SPI, I
2
C™, UART or USB interfaces
• 4×4 QFN package
• Free drivers for most major platforms
How Analog Resistive Works
■ Two conductive coated polyester layers separated by a
spacer layer
■ When touched, top (fl ex) layer moves past spacer layer
and contacts bottom (stable) layer
■ Point of contact creates voltage divider in the X and Y
directions
Development Tools for Resistive Touch
mTouch AR1000 Development Kit (DV102011)
■ UART output (AR1011)
■ SPI or I
2
C output (AR1021)
■ Low cost with advanced
touch functionality
■ Communication support for
I
2
C/SPI/UART
■ Built in decoding and advanced fi ltering
mTouch AR1100 Development Kit (DV102012)
■ Auto detect USB or
UART Communication
(AR1100 Chip)
■ Auto detect USB or
RS-232 Communication
(AR1100 Board)
■ Low cost, high performance USB resistive
■ USB and advanced 9 and 25 point calibration
■ USB mouse or single touch win 7 digitizer
■ Field fl ash updatable (UART and USB)
■ Chip and board product for fast integration