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mTouch? CAPACITIVE EVALUATION
KIT USER’S GUIDE
Chapter 4. Evaluation Board Hardware
This chapter provides a functional overview of the CAP TOUCH – CTMU Evaluation
Board and identifies the major hardware components. Topics covered include:
4.1
APPLICATION FUNCTIONAL OVERVIEW
Block Diagrams for the CSM and CTMU Boards are shown in Figure 4-1 and
FIGURE 4-1:
APPLICATION SIDE BLOCK DIAGRAM FOR THE CTMU BOARD
PIC24FJ128GB106
16 LEDs (D1-D16)
J1
Programming
Header
ICSP?
PGC/EMUC
PGD/EMUD
MCLR
D8-D15
Direct Key Plug-in
Board LEDs
Matrix
Key Plug-in
Board
2-Channel
Slider Plug-in
Board
4-Channel
Slider Plug-in
Board
J4
AN0:AN15
RD0-RD7
RE0:RE7
D+/D-
J5
D1-D12
Matrix Key Plug-in
Board LEDs
D1-D16
2-Channel and
4-Channel Slider
Plug-in LEDs
USB mini-B
Receptacle
8-Channel
Direct Key Slider
Plug-in Board
PLUG-IN BOARDS
Q1
Power Supply
(3.3V)
CAP TOUCH – CTMU EVALUATION 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.
? 2009 Microchip Technology Inc.
DS41385A-page 23
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