DM164128 Microchip Technology, DM164128 Datasheet - Page 23

• Manufacturer Part Number: DM164128
• Description: KIT DEV PICDEM TOUCH SENSE 2
• Manufacturer: Microchip Technology
• Series: mTouch™r

Specifications of DM164128

• Sensor Type: Touch, Capacitive
• Interface: Microprocessor
• Embedded: Yes, MCU, 16-Bit
• Utilized Ic / Part: PIC24F
• Silicon Manufacturer: Microchip
• Silicon Core Number: PIC24F256GB110
• Features: ICSP Programming Capability, Directional Pad, Keypad And Slider Sensor
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Sensitivity: -
• Sensing Range: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.1
FIGURE 4-1:
© 2008 Microchip Technology Inc.
APPLICATION FUNCTIONAL OVERVIEW
S1-12, S21-27
Touch Keypad
Touch Keypad
Programming
Power
Touch
Directional
Numeric
Header
Switch
ROT1
S14
S20
J1
Touch
Slider
This chapter provides a functional overview of the PICDEM Touch Sense 2 Demo
Board and identifies the major hardware components. Topics covered include:
• Application Functional Overview
• Board Components
Figure 4-1 illustrates the main functions of the Touch Sense 2 Demo Board:
APPLICATION SIDE BLOCK DIAGRAM
The operation of the demo board is managed by the PIC24FJ256GB110
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 interface application.
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 Touch 2 Demo Board are comprised of carefully
placed circuit traces and capacitive touch pads, shown in Figure 4-2.
Chapter 4. Demo Board Hardware
ICSP™
AN11:AN14
PGC/EMUC
PGD/EMUD
MCLR
AN0:AN8
AN9:AN10
AN15
PIC24FJ256GB110
PICDEM™ TOUCH SENSE 2 DEMO
RD12:RD13
RD8:RD1
RD1:RD5
RC1:RC4
RD6:RD7
RE0:RE8
D+/D-
RG6
RG7
BOARD USER’S GUIDE
Directional LEDs
D19-24, D26-27,
D12-17, D39-64
Piezo Speaker
Power Supply
USB mini-B
LED Matrix
LED Matrix
Receptacle
D18/Q1
D8-D33
Keypad
Slider
BZ1
D38
DS51748A-page 19