AC164127-3 Microchip Technology, AC164127-3 Datasheet - Page 4

• Manufacturer Part Number: AC164127-3
• Description: BOARD DAUGHTER GRAPHIC PICTAIL
• Manufacturer: Microchip Technology
• Series: PICtail™r

Specifications of AC164127-3

• Main Purpose: Displays, LCD Display
• Embedded: Yes, MCU, 16/32-Bit
• Utilized Ic / Part: AC164127-4 + AC164127-5 Bundle
• Primary Attributes: 3.2" QVGA, Touch Screen, 16 MB Flash
• Secondary Attributes: Parallel Interface
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Getting Started with Touch Sensing
Inductive Touch Sensing
In addition to capacitive touch technology, Microchip
also offers inductive touch sensing technology.
Microchip Inductive mTouch™ Sensing Solution is
proprietary technology. It is available to customers
free-of-charge under a license agreement permitting
use and implementation of the technology on any PIC®
microcontroller or dsPIC® digital signal controller.
Basic Principles
When the user presses the front panel, it defl ects
slightly. This defl ection, on the order of microns, is
inductively detected. The fundamental principle of
operation is that the impedance of an inductor varies
when a nearby magnetically permeable or electrically
conductive material moves relative to the inductor.
Some pressure is needed to trigger the key though
accidental touch trigger is dramatically reduced.
The main advantages are:
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The front panel can be metal, such as stainless steel
or aluminum, plastic or wood
– Inked or etched panel
– Vandal proof
– No cut out or connector/harness required
– Same electronic board with different front panel
– Robust in harsh environment as the metal front
The keys are unaffected by water droplets, humidity
or liquids
– Easy to clean
– Well suited for wet or outdoor application
– Immersion possible
It can sense through thick gloves
– Outdoor or industrial application
It is Braille friendly
– Access control, ATMs
– To comply with governmental regulations
It can differentiate a soft touch from a hard touch
– Speeding up or slowing down accordingly to the
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fi nishes
panel can be grounded
pressure applied
Human Interface Solutions
Easy to Implement
The construction of an inductive touch sensor system
is comprised of three main components: the fascia or
front panel, the spacer layer and the PCB.
Common front panel construction includes sheet
or formed metal, plastic sheet or plastic injection
moldings. The spacer layer between the front panel
and the PCB is needed to allow some defl ection. It can
be built using any mechanically stiff and electrically
insulating material such as FR4, resin bonded paper
or other plastic. Constructions which use an injection
molded fascia typically do not require a spacer layer
since it can be molded as an integral feature of the
plastic. The inductive sensor coil is usually just a fl at
spiral coil etched into the copper layer of a PCB.
MCU Requirements for
Inductive Touch Sensing
Microchip enables designers to integrate inductive
touch-sensing functionality with their existing
application code in a single standard 8-, 16- or
32-bit PIC microcontroller or 16-bit dsPIC digital signal
controller, thus reducing total system costs. The only
peripherals needed are a PWM and an A/D converter.
mTouch Sensing Solution Design Center
Circuit diagrams
Application notes
eLearning
Development tools
Free code libraries and diagnostic software
Recommended products
Device samples
www.microchip.com/mtouch