DM164128 Microchip Technology, DM164128 Datasheet - Page 20

• 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

PICDEM Touch Sense 2 Demo Board User’s Guide
DS51748A-page 16
The global limit area allows the minimum and maximum values for all of the bar graphs
to be globally set manually. The values must be in the range from 0 to 65535. Enter a
value in the text box and press <Enter> for the value to take effect. Notice that changing
this setting overrides any auto-scaling that has been performed.
The Enable Polling checkbox enables communication with the PICDEM Touch Sense
2 Demo Board and the real-time display of sensor information. The USB portion of the
mTouch sensing solution remains operational and communicating with the demo board
even when the box is unchecked. If the checkbox is unselected, the last polled values
from the board remain on the bar graphs until Enable Polling is selected again; the
latest data is displayed at that time, and normal polling resumes. This makes the
checkbox useful as a “Freeze” or pause button.
The “Trip & Guardband” section configures the interaction between the mTouch
sensing solution and Touch Sense 2 Demo Board with regards to guardband and trip
point settings. There are two option buttons:
• Default to Firmware Values enables the trip and guardband values to be
• Use Saved Values enables the values entered into the mTouch sensing solution
The “Retention” area of the Settings subwindow determines how these settings of the
mTouch sensing solution are saved:
• Global minimum and maximum limits for bar graphs
• Auto-scaling settings
• Trip and guardband settings
• Aux1 and Aux2 settings
When the Save Settings When Finished checkbox is selected (default), all of the
above settings are saved to permanent storage on the PC when the mTouch sensing
solution is closed. Clicking the Save Settings Now button immediately saves all of the
above values to permanent storage on the PC. In both cases, all settings are restored
when the application is restarted.
Leaving Save Settings When Finished unselected allows users to save working
configurations at their discretion by using the Save Settings Now button. This allows
for experimentation with the ability to return to “known good” settings by quitting the
mTouch sensing solution and restarting it.
3.2.2.2
In addition to global display settings, each of the sensor channels can be individually
configured to adjust its behavior, as well as specific display properties. To do this,
left-click directly on top of any channel’s bar graph; the Setup dialog box for that
channel appears (Figure 3-5).
Clicking on another channel while a Setup dialog is open does not close the original
window or open a second Setup dialog. Instead, the dialog box becomes the Setup
dialog for the channel most recently selected.
calculated by the demo board’s firmware, using an algorithm that calculates the
optimum trip and guardband values based on the average value. These values
are sent to the mTouch sensing solution tool via the USB connection, and are
constantly updated and displayed on the bar graphs; this is enabled by default.
to be sent to and used by the demo board via USB. The trip and guardband
values set by the mTouch sensing solution by user input are static, and only
change when the user changes them.
INDIVIDUAL SENSOR DISPLAY SETUP
© 2008 Microchip Technology Inc.