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mTouch? CAPACITIVE EVALUATION
KIT USER ’S GUIDE
Chapter 5. Troubleshooting
5.1
5.2
HIGHLIGHTS
This chapter discusses common operational issues and methods to resolve them.
COMMON ISSUES
1. The demo board does not respond to inputs (i.e., no lights when a key
plug-in or touch sensor is touched)
Check the CAP TOUCH – CTMU Evaluation Board board for power:
? Verify that USB power (V USB , +5 V DC ) is present on the USB connection.
? If the demo board is connected to a computer through a USB hub, verify the
hub is powered and capable of providing power to downstream devices.
? If the demo board is directly connected to a computer, verify that the USB port
used is active; try switching to another port.
2. The touch sensors are abnormally sensitive or insensitive (generally
insensitive) to inputs
Check to make sure that the plug-in boards are connected to the channels that are
mentioned in the Readme.txt file.
Check the bar graph settings for the sensors in the mTouch? sensing solution soft-
ware. The demo board’s trip point and other settings may have been changed to
values that interfere with the default operation. To correct:
? In the Settings dialog box, verify that the Use Firmware Settings option is
selected.
? If the Use Saved Value option is selected instead, change the trip point
values for each affected channel to a value that produces an appropriate
response.
3. The evaluation board and the mTouch sensing solution diagnostic tool are
installed and operating properly, but are not communicating with each
other
The USB host controller may not have enumerated the evaluation board correctly
upon connection. To correct, try the following:
? If the evaluation board is connected through an external USB hub, try
connecting it directly to a USB port on the host computer.
? Disconnect the board, wait for 5 to 10 seconds, then reconnect the board.
It is also possible that the USB host controller has dropped the communication
channel. This happens occasionally when the demo board is placed into Standby
mode and then powered up using the power control. In this case, disconnect the
evaluation board and reconnect after 5 to 10 seconds.
4. The board’s edge connector will add some additional parasitic capacitance
to the system.
5. Touching the solder connections can create a very strong coupling to the
sensor and trigger buttons.
? 2009 Microchip Technology Inc.
DS41385A-page 29
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