Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Hoja De Datos
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Los códigos de productos
AT91SAM9M10-G45-EK
899
SAM9M10 [DATASHEET]
6355F–ATARM–12-Mar-13
Figure 40-3.
Touch Screen Switches Implementation
40.7.3
Pressure Measurement Method
The method to measure the pressure (Rp) applied to the touch screen is based on the knowledge of the X-Panel
resistance (Rxp).
resistance (Rxp).
Three conversions (Xpos,Z1,Z2) are necessary to determine the value of Rp (Zaxis resistance).
Rp = Rxp*(Xpos/1024)*[(Z2/Z1)-1]
X
P
X
M
Y
M
VDDANA
Y
P
VDDANA
GND
GND
To the ADC
X
P
X
M
Y
P
VDDANA
GND
Switch
Resistor
Switch
Resistor
Y
P
Y
M
X
P
VDDANA
GND
Switch
Resistor
Switch
Resistor
Horizontal Position Detection
Vertical Position Detection