The UC3-L0 Xplained kit has one QTouch button and one QMatrix slider implemented onboard. The button and the slider are connected to the built-in CAT module in the AT32UC3L064.
The QMatrix slider can be reconfigured to be used as four separate buttons instead of as a slider.
Table 7. UC3-L0 Xplained touch connections
|
Touch sensor onboard reference |
QTouch method pin name |
QMatrix method pin name |
CAT module pin name |
UC3 pin |
Selection bit in PINMODEx register |
|---|---|---|---|---|---|
|
QSlider X0 |
X7 |
CSB6 |
PA15 |
SP6 | |
|
QSlider X1 |
X10 |
CSA10 |
PA19 |
SP10 | |
|
QSlider X2 |
X11 |
CSB10 |
PA22 |
SP10 | |
|
QSlider X3 |
X13 |
CSB12 |
PB08 |
SP12 | |
|
QSlider YK0 |
YK3 |
CSB7 |
PA05 |
SP7 | |
|
- |
Y3 |
CSA7 |
PA04 |
SP7 | |
|
QButton SNSK0 |
SNSK15 |
CSB15 |
PB09 |
SP15 | |
|
- |
SNS15 |
CSA15 |
PB12 |
SP15 |
Note
As the device has a very low pin count, a tradeoff has been made to be able to have as many I/O lines as possible routed to the headers. The sensor lines to the QTouch button and the QMatrix slider are shared with some of the headers. The sensitivity of the sensor lines is very high on these exposed pins, and so touching the I/O pins will give erroneous result in the touch sensing mechanism.
Note
Adding top modules to the board with functionality connected to these pins is not recommended. Top modules without functionality on these pins will only add some capacitive load and will not affect the QMatrix sensor significantly.