ATxmega32A4U Atmel Corporation, ATxmega32A4U Datasheet - Page 382

• Manufacturer Part Number: ATxmega32A4U
• Manufacturer: Atmel Corporation

Specifications of ATxmega32A4U

• Flash (kbytes): 32 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 34
• Ext Interrupts: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 7
• Twi (i2c): 2
• Uart: 5
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 2
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 4
• Eeprom (bytes): 1024
• 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: 5
• Output Compare Channels: 16
• Input Capture Channels: 16
• Pwm Channels: 16
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

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
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