DM183026 Microchip Technology, DM183026 Datasheet - Page 27

• Manufacturer Part Number: DM183026
• Description: KIT EVALUATION PIC16F/PIC24F
• Manufacturer: Microchip Technology
• Series: mTouch™r

Specifications of DM183026

• Sensor Type: Touch, Capacitive
• Embedded: Yes, Other
• Utilized Ic / Part: PIC16F727, PIC24FJ128GB106
• Processor To Be Evaluated: PIC16F, PIC24F
• Interface Type: USB
• Silicon Manufacturer: Microchip
• Kit Application Type: Sensing - Touch / Proximity
• Application Sub Type: Capacitive Touch
• Kit Contents: 6x Brds, Analyser, Cable, CD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Interface: -
• Sensitivity: -
• Sensing Range: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

4.1
FIGURE 4-1:
© 2009 Microchip Technology Inc.
APPLICATION FUNCTIONAL OVERVIEW
PLUG-IN BOARDS
Direct Key Slider
Programming
Plug-in
Slider Plug-in
Slider Plug-in
Key Plug-in
2-Channel
4-Channel
8-Channel
Header
Matrix
Board
Board
Board
J1
Chapter 4. Evaluation Board Hardware
Board
This chapter provides a functional overview of the CAP TOUCH – CTMU Evaluation
Board and identifies the major hardware components. Topics covered include:
• Application Functional Overview
• Board Components
Block Diagrams for the CSM and CTMU Boards are shown in Figure 4-1 and
Figure 4-2.
APPLICATION SIDE BLOCK DIAGRAM FOR THE CTMU BOARD
The operation of the demo board is managed by the PIC24F microcontroller, which
requires very little additional hardware to perform its tasks. In addition to the touch
sense demo application code, the preloaded demo uses substantial parts of the
Microchip USB Stack Library to provide a hardware interface to the PC-based
mTouch™ sensing solution diagnostic tool.
The touch sense application uses the microcontroller’s Charge Time Measurement
Unit (CTMU) and all 16 of the microcontroller’s A/D input channels to monitor the touch
interfaces. The CTMU functions by sensing small changes in capacitance on its inputs,
such as those occurring when a person touches the copper pad electrodes. By
continuously monitoring for these changes, the CTMU can determine when a touch
event occurs. The sensors on the CAP TOUCH – CTMU Evaluation Board comprise
carefully placed circuit traces and capacitive touch pads.
ICSP™
mTouch™ CAPACITIVE EVALUATION
J4
PGC/EMUC
PGD/EMUD
MCLR
AN0:AN15
PIC24FJ128GB106
CAP TOUCH – CTMU EVALUATION BOARD
RD0-RD7
RE0:RE7
D+/D-
J5
KIT USER’S GUIDE
16 LEDs (D1-D16)
Direct Key Plug-in
Matrix Key Plug-in
4-Channel Slider
Power Supply
2-Channel and
USB mini-B
Plug-in LEDs
Receptacle
Board LEDs
Board LEDs
(3.3V)
D8-D15
D1-D12
D1-D16
Q1
DS41385A-page 23