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PICDEM Touch Sense 2 Demo Board User’s Guide
4.2.1
Components
The components listed here (in order of their reference tags in Figure 4-3) are the key
components of the application side of the Touch Sense 2 Demo Board:
1. PIC24FJ256GB110 Microcontroller (U1): This provides the processing power
for the Touch Sense demo applications. The microcontroller features 256 Kbytes
of Flash program memory and 16 Kbytes RAM, allowing sufficient space for the
development of more complex touch sense applications.
The demo application uses an 8 MHz signal to create the 48 MHz USB clock, as
well as the application’s 32 MHz clock. Crystal, Y1, and associated components
are used by the microcontroller ’s internal oscillator to maintain the frequency
tolerances required by the USB specifications.
2. USB mini-B Receptacle (J3): This provides a convenient interface to the
PC-side of the demo application. As the Touch Sense 2 Demo Board functions
as a bus-powered device, this connection also provides power to the board.
3. ICSP Header Interface (J1): This provides a standard Microchip ICD interface
for programming and debugging applications on the Touch Sense 2 Demo
Board; it is designed to connect directly with Microchip’s PICkit? Serial
Programmer. Pin 1 (N/C) is located on the right side of the interface, as viewed
from the front of the board, and is marked with an arrow.
An optional RJ-11 adapter (Microchip Part # AC164110, included with the Touch
Sense 2 Demo Board kit) can also be used for modular cable connections to both
the MPLAB ICD 2 Programmer/Debugger module and the MPLAB REAL ICE?
module. Switch S11 (to the left of the header) connects the PGD and PGC lines
of the interface with columns 3 and 4 of the keypad, which are also used as the
PGD and PGC pins of the microcontroller.
4. Power Supply (D18/Q1): This converts the +5 V DC from V BUS to the regulated
+3.3 V DC required by the demo board.
Circuit traces in this area are also provided to create a non-USB power supply for
self-powered (freestanding) use. This power supply is designed to convert 9 VAC
to a regulated +3.3 V DC and +5 V DC . To implement, the user will need to populate
the indicated locations with diode, D25, and voltage regulator, U5, as well as
capacitors, C14, C15, C16 and C17, and receptacle, J4. Specifications for these
5. Piezo Speaker (BZ1): This small form factor component provides audible
feedback in the demo application.
6. Directional Sensor LEDs (D19-24, D26-27, D38): These provide visual
feedback for touch events on the directional sensor pad.
7. Directional Touch Sensor (ROT1): The capacitive sensors are located in this
area on the front side of the board (see Figure 4-2).
8. Numeric Keypad (S1-12, S21-28, D1-10, D28-37): This area contains the
sensors and LEDs associated with the touch keypad. The capacitive touch
sensors are located on the front of the board (see Figure 4-2).
9. Touch Slide (S14, D12-17, D39-64): This area contains the sensors for the
touch slide and the 32 LEDs comprising the continuous bar display. The
capacitive touch sensors are located on the front of the board (see Figure 4-2).
10. Power Touch Switch (S20, D65): This area contains the LED and sensor for the
demo board’s “soft” power switch. The sensor is located in this area on the front
side of the board (see Figure 4-2).
DS51748A-page 22
? 2008 Microchip Technology Inc.
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