SAM9G20 Atmel Corporation, SAM9G20 Datasheet - Page 920
SAM9G20
Manufacturer Part Number
SAM9G20
Description
Manufacturer
Atmel Corporation
Datasheets
1.SAM9261.pdf
(248 pages)
2.SAM9261.pdf
(1274 pages)
3.SAM9261.pdf
(43 pages)
4.SAM9G20.pdf
(42 pages)
5.SAM9G20.pdf
(832 pages)
Specifications of SAM9G20
Flash (kbytes)
0 Kbytes
Pin Count
217
Max. Operating Frequency
400 MHz
Cpu
ARM926
Hardware Qtouch Acquisition
No
Max I/o Pins
96
Ext Interrupts
96
Usb Transceiver
3
Usb Speed
Full Speed
Usb Interface
Host, Device
Spi
2
Twi (i2c)
1
Uart
7
Ssc
1
Ethernet
1
Sd / Emmc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
Yes
Adc Channels
4
Adc Resolution (bits)
10
Adc Speed (ksps)
95
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
32
Self Program Memory
NO
External Bus Interface
1
Dram Memory
sdram
Nand Interface
Yes
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8/3.3
Operating Voltage (vcc)
0.9 to 1.1
Fpu
No
Mpu / Mmu
No/Yes
Timers
6
Output Compare Channels
6
Input Capture Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
No
- SAM9261 PDF datasheet
- SAM9261 PDF datasheet #2
- SAM9261 PDF datasheet #3
- SAM9G20 PDF datasheet #4
- SAM9G20 PDF datasheet #5
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41.7.2
41.7.3
920
SAM9G35
4-wire Resistive Touchscreen Principles
4-wire Position Measurement Method
A resistive touchscreen is based on two resistive films, each one being fitted with a pair of elec-
trodes, placed at the top and bottom on one film, and on the right and left on the other. In
between, there is a layer acting as an insulator, but also enables contact when you press the
screen. This is illustrated in
The TSADC controller has the ability to perform without external components:
Figure 41-5. Touchscreen Position Measurement
As shown in
bottom. Due to the linear resistance of the film, there is a voltage gradient from top to bottom.
When a contact is performed on the screen, the voltage propagates at the point the two surfaces
come into contact with the second film. If the input impedance on the right and left electrodes
sense is high enough, the film does not affect this voltage, despite its resistive nature.
For the horizontal direction, the same method is used, but by applying supply from left to right.
The range depends on the supply voltage and on the loss in the switches that connect to the top
and bottom electrodes.
In an ideal world (linear, with no loss through switches), the horizontal position is equal to:
The implementation with on-chip power switches is shown in
ment at the output of the switch compensates for the switches loss.
• Position Measurement
• Pressure Measurement
• Pen Detection
VY
M
/ VDD or VY
Figure
Vertical Position Detection
X
X
M
P
41-5, to detect the position of a contact, a supply is first applied from top to
P
Y
/ VDD.
M
Y
P
Figure
Volt
VDD
GND
41-5.
X
M
Contact
Pen
X
P
Horizontal Position Detection
Figure
Y
Y
M
P
Y
P
41-6. The voltage measure-
X
P
11053B–ATARM–22-Sep-11
Volt
VDD
GND
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