DM183026-2 Microchip Technology, DM183026-2 Datasheet - Page 29

• Manufacturer Part Number: DM183026-2
• Description: KIT EVAL MTOUCH CAPACTIVIE
• Manufacturer: Microchip Technology
• Series: mTouch™r

Specifications of DM183026-2

• Sensor Type: Touch, Capacitive
• Sensing Range: 8 & 12 Buttons/Keys, 2 Sliders
• Interface: I²C
• Voltage - Supply: 5V, USB
• Embedded: Yes
• Utilized Ic / Part: PIC16F, PIC18F, PIC24F, PIC32MX
• Interface Type: USB, I2C, UART
• Operating Voltage: 5 V
• Data Bus Width: 32 bit
• Silicon Manufacturer: Microchip
• Kit Application Type: Sensing - Touch / Proximity
• Application Sub Type: Capacitive Touch
• Kit Contents: 8x Brds, Serial Anaylizer, USB Cable
• For Use With/related Products: PIC16F, PIC24F, PIC18F, PIC32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensitivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

FIGURE 4-3:
© 2010 Microchip Technology Inc.
PLUG-IN BOARDS
7-Channel Matrix
Plug-in
Programming
Slider Plug-in
Slider Plug-in
Key Plug-in
2-Channel
4-Channel
8-Channel
Direct Key
Header
Board
Board
Board
J1
Board
4.1.3
The operation of the PIC24F CTMU Evaluation Board (see Figure 4-3) is managed by
the PIC24F microcontroller, which requires very little additional hardware to perform its
tasks. In addition to the touch sense demonstration application code, the preloaded
demonstration uses substantial parts of the Microchip USB Stack Library to provide a
hardware interface to the PC-based mTouch sensing solution diagnostic tool.
PIC24F CTMU EVALUATION BOARD APPLICATION-SIDE BLOCK DIAGRAM
The touch sense application uses the PIC24F microcontroller’s 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 evaluation board comprise carefully placed circuit traces and
capacitive touch pads.
The evaluation board comprises 16 A/D channels of the PIC24F microcontroller
connected to connector, J4/J3. This connector is used to interface the plug-in boards
to the evaluation board.
The plug-in boards can be connected to any of the 16 channels of the connector (14)
by changing the configuration settings, which is explained in the Readme.txt file.
A total of 16 LEDs are provided in the evaluation board. These LEDs are driven directly
by the microcontroller through pins on PORTD and PORTE. When an event occurs, the
application firmware also provides feedback by activating one or more LEDs at that
location. The sequence for the activation of the LEDs depends on the type of touch
pads that is interfaced to the evaluation board.
The microcontroller uses its on-chip USB engine and transceiver to communicate to the
PC side interface application, using the USB mini-B receptacle. The evaluation board
also uses the USB receptacle for application power as a bus-powered device.
Microcontroller and LED power are provided from the V
voltage regulator. Provisions on the board allow for users to add components and
create an externally powered application.
ICSP™
PIC24F CTMU Evaluation Board
J3
J4
PGC/EMUC
PGD/EMUD
MCLR
AN0:AN15
PIC24FJ128GB106
PIC24F CTMU EVALUATION BOARD
Evaluation Board Hardware
RD0-RD7
RE0:RE7
D+/D-
J5
BUS
by Q1, an MCP1702
16 LEDs (D1-D16)
Matrix Key Plug-in
Direct Key Plug-in
4-Channel Slider
Power Supply
2-Channel and
USB mini-B
Receptacle
Plug-in LEDs
Board LEDs
Board LEDs
(3.3V)
D8-D15
D1-D12
D1-D16
Q1
DS41385C-page 29