ATxmega128A3U Atmel Corporation, ATxmega128A3U Datasheet - Page 382
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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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29. DAC - Digital to Analog Converter
29.1
29.2
8331A–AVR–07/11
Features
Overview
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The Digital to Analog Converter (DAC) converts digital values to voltages. The DAC has two
channels, 12-bit resolution, and is capable of converting 1 Million Samples Per Second (MSPS)
on each channels. The built-in calibration system can remove offset and gain error when loaded
with calibration values from software.
A DAC conversion is automatically started when new data to be converted is available. Event
from the Event System can also be used, and this enable synchronized and timed conversions
between the DAC and other peripherals such as a Timer/Counter. The DMA Controller can be
used to transfer data to the DAC.
The DAC has high drive strengths and is capable of driving both resistive and capacitive loads,
and a load which is a combination of this. A low power mode is available, and this will reduce the
drive strengths of the output.
Both internal and external voltage reference can be used. The DAC output is also internally
available for use as input to the Analog Comparator or ADC.
Figure 29-1 on page 383
ity is shown.
12-bit resolution
Two independents and continues-time channels per DAC
Up to 1Million Samples Per Second conversion rate per DAC channel
Built in calibration that removes
Multiple conversion trigger sources
High drive capabilities and support for
Internal and external reference options
DAC output available as input to Analog Comparator and ADC
Low Power mode with reduced drive strength
Optional DMA transfer of data
– Offset error
– Gain error
– On new available data
– Events from the Event System
– Resistive load
– Capacitive load
– Combined resistive and capacitive load
illustrates the basic functionality related to the DAC. Not all functional-
Atmel AVR XMEGA AU
382
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