DM240011 Microchip Technology, DM240011 Datasheet - Page 14

KIT STARTER MPLAB FOR PIC24F MCU

DM240011

Manufacturer Part Number
DM240011
Description
KIT STARTER MPLAB FOR PIC24F MCU
Manufacturer
Microchip Technology
Series
MPLAB®r
Type
MCUr
Datasheet

Specifications of DM240011

Contents
Board, Cable, CD
Processor To Be Evaluated
PIC24F
Data Bus Width
16 bit
Interface Type
USB
Silicon Manufacturer
Microchip
Core Architecture
PIC
Core Sub-architecture
PIC24
Silicon Core Number
PIC24F
Silicon Family Name
PIC24FJxxGBxxx
Kit Contents
Board Cables CD Docs
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
PIC24F
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
DM240011
Manufacturer:
Microchip Technology
Quantity:
135
Part Number:
DM240011
Manufacturer:
MICROCHIP
Quantity:
12 000
MPLAB Starter Kit for PIC24F User’s Guide
DS51725A-page 10
2.1.2
To control most of the demo application’s features, the PIC24F microcontroller uses an
on-chip Charge Time Measurement Unit (CTMU) module to implement a capacitive
touch-sensitive touch pad on the starter kit board. The CTMU allows the microcontroller
to directly sense the touch of a fingertip on the touch pad and interpret this as a control
input.
The touch pad (Figure 2-2) is used to select all menu options and input user choices
for all options. At each of the menu screens, the up/down arrows (1 and 3) and left/right
arrows (2 and 4) serve to highlight a menu option displayed on the OLED, and the cen-
ter key (5) is used to select the option.
FIGURE 2-2:
2.1.2.1
By default, the application is preprogrammed with a CTMU calibration that responds
appropriately to the touch of an average person’s finger tip. However, there are many
factors (ambient temperature and humidity, skin moisture, etc.) that may affect the
touch pad’s performance. To accommodate these differences, the demo application
includes a calibration routine to adjust the touch pad’s response.
To run the calibration, select “Utilities” from the main menu, then “Calibrate” from the
“Utilities” menu. A series of prompts appears, asking the user to touch and release
each individual pad in turn. When the sequence is completed, the “Calibration com-
plete!” message appears. The application automatically returns to the main menu
afterwards.
Calibration is reset to the default application value on power-up.
Note:
Touch Interface (CMTU)
TOUCH PAD CALIBRATION
It is important to respond to each prompt as quickly as possible, to maintain
contact with a pad until instructed to release it, and to be certain that none
of the pads are being touched during the “release” intervals. Otherwise, one
or more of the individual pads may be incorrectly calibrated, and the
application may act erratically or start responding to “phantom” inputs.
CAPACITIVE TOUCH PAD
LEFT
4
CENTER
DOWN
UP
1
5
3
2
RIGHT
© 2008 Microchip Technology Inc.

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