ATxmega128A3U Atmel Corporation, ATxmega128A3U Datasheet - Page 354
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ATxmega128A3U
Manufacturer Part Number
ATxmega128A3U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega128A3U
Flash (kbytes)
128 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 Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
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)
8
Eeprom (bytes)
2048
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega128A3U-AU
Manufacturer:
ATMEL
Quantity:
39
Company:
Part Number:
ATxmega128A3U-MH
Manufacturer:
ATMEL
Quantity:
1
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Figure 28-1. ADC overview
28.3
28.3.1
8331A–AVR–07/11
ADC15
ADC0
ADC4
ADC7
ADC0
ADC3
•
•
•
•
•
•
•
•
•
Input sources
Differential input
½x - 64x
Internal
Internal
signals
signals
Both internal and external reference voltages can be used. An integrated temperature sensor is
available for use with the ADC. The output from the DAC, VCC/10 and the Bandgap voltage can
also be measured by the ADC.
The ADC has a compare function for accurate monitoring of user defined thresholds with mini-
mum software intervention required.
CHn.CTRL
CHn.MUXCTRL
CHn.SCAN
Input sources are the voltage inputs that the ADC can measure and convert. Four types of mea-
surements can be selected:
The input pins are used for single ended and differential input, while the internal inputs are
directly available inside the device. In devices with two ADCs, PORTA pins can be input to
ADCA and PORTB pins can be input to ADCB. For XMEGA devices with only one ADC, input
pins may be available for ADCA on both PORTA and PORTB.
The ADC is differential, so for single ended measurements the negative input is connected to an
fixed internal value. The four types of measurements and their corresponding input options are
shown in
When differential input is enabled, all input pins can be selected as positive input, and input pins
0 to 3 can be selected as negative input. The ADC must be in signed mode when differential
input is used.
• Differential input
• Differential input with gain
• Single ended input
• Internal input
Internal VCC/1.6V
V
Internal VCC/2
V
INN
Internal 1.00V
INP
Figure 28-2 on page 355
AREFA
AREFB
V
IN
REFCTRL
ADC
Stage
2
S&H
1
2 bits
ADC
Digital Correction Logic
DAC
CTRLA
CTRLB
Enable
Start
Mode
Resolution
Stage
2
2
Σ
to
2x
Figure 28-6 on page
Stage
2
V
12
EVCTRL
OUT
Action
Select
Atmel AVR XMEGA AU
CH0
CH1
CH2
CH3
Int. Flag
Int. Flag
Int. Flag
Int. Flag
357.
Compare Register
Int. Mode
Int. Mode
Int. Mode
Int. Mode
Result
Result
Result
Result
<
>
Threshold
(Int Req)
354
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