AT91SAM9G45-EKES Atmel, AT91SAM9G45-EKES Datasheet - Page 941

• Manufacturer Part Number: AT91SAM9G45-EKES
• Description: KIT EVAL FOR AT91SAM9G45
• Manufacturer: Atmel
• Series: AT91SAM Smart ARMr
• Type: MCUr

Specifications of AT91SAM9G45-EKES

• Contents: Board
• Processor To Be Evaluated: SAM9G45
• Data Bus Width: 32 bit
• Interface Type: I2C, SPI, UART
• Maximum Operating Temperature: + 50 C
• Minimum Operating Temperature: - 10 C
• Operating Supply Voltage: 1.8 V to 3.3 V
• For Use With/related Products: AT91SAM9G45
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q4626953

Figure 40-3. Touch Screen Switches Implementation
40.7.3
6438F–ATARM–21-Jun-10
Pressure Measurement Method
The method to measure the pressure (Rp) applied to the touch screen is based on the knowl-
edge of the X-Panel resistance (Rxp).
Three conversions (Xpos,Z1,Z2) are necessary to determine the value of Rp (Zaxis resistance).
Rp = Rxp*(Xpos/1024)*[(Z2/Z1)-1]
Horizontal Position Detection
X
X
VDDANA
M
P
GND
X
Y
X
Y
M
M
P
P
Resistor
Switch
Resistor
Switch
Y
P
VDDANA
VDDANA
GND
GND
Vertical Position Detection
Y
Y
VDDANA
M
P
GND
To the ADC
Resistor
Switch
Resistor
Switch
X
P
AT91SAM9G45
941