AC164127-3【PDF 4/12 页】BOARD DAUGHTER GRAPHIC PICTAIL

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mTouch Sensing Solutions

Metal Over Cap Technology

mTouch capacitive touch solutions allow users to work with a

variety of plastic or glass overlays to finish their user interface

designs. With metal over cap technology users can also:

■ Use polished or brushed metal surfaces including

stainless steel and aluminium

■ Sense through gloves

■ Create water-proof designs

■ Deploy Braille-friendly interfaces

How Metal Over Cap Technology Works

The front panel and the sensor create

a capacitor. When the user presses the

key, the distance between both plates will

decrease slightly, increasing the capacitor

value. Thanks to their high SNR (Signal to

Noise Ratio) and stability over voltage and

temperature, mTouch sensing solutions allow the detection of

deflection as low as 10?μm.

Metal Over Cap Technology can be implemented with the

same hardware, PCB and electronics, and SW as capacitive

touch technology.

Development Tools for Capacitive Touch

Enhanced mTouch Capacitive Evaluation Kit

(DM183026-2)

The Enhanced mTouch Capacitive

Evaluation Kit provides a simple platform

for developing a variety of capacitive

touch sense applications using 8, 16

and 32-bit PIC microcontrollers. The kit

contains:

■ 8-key sensor board direct interface

■ 12-key matrix sensor board

■ 4-channel slider sensor board

■ 2-channel slider sensor board

■ Four PIC MCU processor boards:

???? PIC16F1937, PIC18F46J50, PIC24FJ64GB106 and

PIC32MX795F512H

■ Diagnostic GUI to analyze touch sensor data

real-time via USB

■ PICkit? Serial Analyzer

Additional available processor boards:

■ PIC24H mTouch Capacitive Touch Evaluation Board*

(AC243026)

■ PIC32 CTMU Evaluation Board (AC323027)

Metal Over Cap Accessory Kit (AC183026)

■ The AC182036 kit contains two

daughter boards showcasing

Metal Over Cap technology.

One board has a stainless

steel cover while the other one has a plastic one.

■ It provides an easy way to evaluate Microchip’s unique

technology, when used in conjunction with the mTouch

Capacitive Touch Evaluation Kit (DM183026-2).

mTouch Software Package

Microchip provides a fully developed and tested SW

package. It features:

■ Source code available

■ Keys, slider and wheel support

■ Matrix

■ Proximity detection with speci?c algorithm offering great

range and low power

■ Available for 8,16 and 32-bits

■ Low Power

???? Capacitive sensing in less than 5?μA

???? Proximity sensing down to less than 1?μA

■ Gesture

■ Several output mode like direct or toggle mode as well

as serial communication

■ Easy to integrate with Microchip libraries such as

Graphics or USB

■ Two way communication with PC or Master

■ Works with PCB or ITO sensors

Specific noise features include:

■ High Signal to Noise Ratio (SNR)

■ Differential touch sensing mode

■ Adjacent button rejection or “most-pressed” options

■ Active Guard Ring support

■ Self and mutual measurement

■ Automatic environmental compensation

■ Various proprietary noise ?ltering algorithms

Application Notes for mTouch

■ Techniques for Robust Capacitive Touch Sensing , AN1334

■ mTouch Metal Over Cap Technology, AN1325

■ mTouch Conducted Noise Immunity Techniques for

CTMU Peripheral , AN1317

■ Capacitive Touch Using Only an ADC (CVD)

(suitable for PIC10/12/16/24H/32 MCUs) , AN1298

■ Microchip CTMU for Capacitive Touch Applications

(suitable for PIC18 and PIC24F MCUs) , AN1250

■ Capacitive Touch Algorithm Simulation , AN1254

*Code also supports dsPIC33 DSC.

4

Microchip Human Interface Solutions

www.microchip.com/mtouch

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