ATxmega256A3 Atmel Corporation, ATxmega256A3 Datasheet - Page 300

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ATxmega256A3

Manufacturer Part Number
ATxmega256A3
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATxmega256A3

Flash (kbytes)
256 Kbytes
Pin Count
64
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
50
Ext Interrupts
50
Usb Speed
No
Usb Interface
No
Spi
10
Twi (i2c)
2
Uart
7
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
16
Adc Resolution (bits)
12
Adc Speed (ksps)
2000
Analog Comparators
4
Resistive Touch Screen
No
Dac Channels
2
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
AES/DES
Sram (kbytes)
16
Eeprom (bytes)
4096
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.6 to 3.6
Operating Voltage (vcc)
1.6 to 3.6
Fpu
No
Mpu / Mmu
no / no
Timers
7
Output Compare Channels
22
Input Capture Channels
22
Pwm Channels
22
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes

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25.10 ADC Input Model
8077H–AVR–12/09
Figure 25-18. ADC timing for free running mode
An analog voltage input must be able to charge the sample and hold (S/H) capacitor in the ADC
in order to achieve maximum accuracy. Seen externally the ADC input consists of a input chan-
nel (R
300
Figure 25-19. ADC input for single ended measurements
Figure 25-20. ADC input for differential measurements and differential measurements with gain
In order to achieve n bit accuracy, the source output resistance, R
ADC input resistance on a pin:
GAINSTAGE AMPLIFY
START CH0, wo/GAIN
START CH1, wo/GAIN
GAINSTAGE SAMPLE
START CH0, w/GAIN
START CH1, w/GAIN
CONV COMPLETE
Negative
and
Positive
Positive
ADC SAMPLE
input
input
input
channel
CLK
Figure 25-20 on page 300
ADC
) and the switch (R
1
0
2
switch
2
1
R
R
R
3
channel
channel
shows the ADC input channels.
channel
) resistance, and the S/H capacitor.
2
3
2
4
3
3
5
R
R
R
switch
switch
switch
0
6
2
1
7
source
2
, must be less than the
3
2
Figure 25-19 on page
8
C
C
C
Sample
3
Sample
Sample
XMEGA A
3
0
9
VCC/2
VCC/2
0
1
10
300

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