NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 1204 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
ADC
XP
XP
XM
XM
YP
YP
YM
YM
4-wire Touch Screen
4-wire Touch Screen
Figure 5.32-6 4-wire Touch Screen Connection Diagram
ADC
5-wire Touch Screen
5-wire Touch Screen
XP
XP
Bottom Plate
Bottom Plate
YP
YP
VSENSE
VSENSE
XM
XM
YM
YM
Top Plate
Top Plate
Figure 5.32-7 5-wire Touch Screen Connection Diagram
4-wire Pressure Measurement
5.32.5.10
To distinguish pen or finger touch, the pressure of the touch needs to be determined. The IP
provides two solutions. The first method requires knowing the X-plate resistance, measurement of
the X-Position, and two additional cross-panel measurements (Z1 and Z2) of the touch screen.
Use the following Equation to calculate the touch resistance:
(
)