DM183026-2 Microchip Technology, DM183026-2 Datasheet - Page 18

• 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

mTouch™ Advanced Capacitive Evaluation Kits User’s Guide
2.2
DS41385C-page 18
INDIVIDUAL TOUCH SENSE DEMONSTRATIONS
The PC-side application accompanying the mTouch Advanced Capacitive Evaluation Kit
can be used to change the sensitivity of the sensors by writing trip point information back
to the board.
2.1.2
By design, the demonstration application is designed to respond to a state change
event on any sensor. More simply, they respond to a touch, and not to a touch and
release. This behavior, along with the firmware’s slow averaging algorithm that
accounts for constant changes in the evaluation board’s environment, causes a
continuous touch on one or more sensors to yield an affirmative response for a few
seconds, followed eventually by no response at all. Removing the touch stimulus from
the sensor resets the algorithm and restores the sensor’s responsiveness.
2.2.1
The Direct Key Plug-in daughter board is an 8-channel plug-in board with one key
directly mapped to one channel. This can be interfaced with any of the 8 channels of the
16 channels provided in the mTouch Advanced Capacitive Evaluation Kit. Touching any
one of the keys on the plug-in board will light up the corresponding LED in the evalua-
tion board.
The LEDs, D8 to D15 of the evaluation board, correspond to the direct keys numbered
from ‘8’ to ‘F’, respectively, in the Direct Key Plug-in daughter board.
The default firmware loaded in the mTouch Advanced Capacitive Evaluation Kit is
configured for channels 8 to 15 in PIC16F CSM, PIC24F CTMU, PIC24H CVD and
PIC32MX CVD evaluation boards, and channels 0 to 7 in PIC18F CTMU Evaluation
Boards.
When the key numbered ‘8’ is pressed, the LED D8 will be lit. Similarly, when keys, ‘9’
through ‘F’, are pressed, the LEDs, D9 through D15, will be lit. Here, one LED will be
lit for every press key on the plug-in board (see Figure 2-1).
FIGURE 2-1:
Sensor Persistence
8-Key Direct Plug-in Daughter Board
DEFAULT PLUG-IN CHANNELS FOR 8-KEY PLUG-IN BOARD
© 2010 Microchip Technology Inc.