ATxmega64A4U Atmel Corporation, ATxmega64A4U Datasheet - Page 383
ATxmega64A4U
Manufacturer Part Number
ATxmega64A4U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega64A4U
Flash (kbytes)
64 Kbytes
Pin Count
44
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
34
Ext Interrupts
34
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
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)
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
5
Output Compare Channels
16
Input Capture Channels
16
Pwm Channels
16
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega64A4U-AU
Manufacturer:
ON
Quantity:
29 000
Company:
Part Number:
ATxmega64A4U-U
Manufacturer:
ATMEL
Quantity:
74
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29.3
29.4
29.5
29.6
8331A–AVR–07/11
Voltage reference selection
Starting a conversion
Output and output channels
DAC Output model
Figure 29-1. DAC overview
The following voltages can be used as reference (VREF) for the DAC
By default conversions will be started automatically when new data is written to the channel data
register. It is also possible to enable events from the Event System to trigger conversion starts.
When this is enabled, a new conversion is started when the DAC channel receives an event and
if the channel data register has been updated. This enable the conversion starts to be synchro-
nized with external events and/or timed to ensure regular and fixed conversion intervals.
The two DAC channels have fully independent outputs and individual data and conversion con-
trol registers. This enables the DAC to create two different analog signals. The channel 0 output
can also be made internally available as input for the Analog Comparator and the ADC.
The output voltage from a DAC channel (VDAC) is given as:
Each DAC output channel has a driver buffer with feedback to ensure that the voltage on the
DAC output pin is equal to the DACs internal voltage.
output model, for details on R
V
DACx
– AVCC voltage
– Accurate internal 1.00V voltage.
– External voltage applied to AREF pin on PORTA.
– External voltage applied to AREF pin on PORTB.
=
CHnDATA
--------------------------- -
0xFFF
(Data Empty)
(Data Empty)
DMA req
Internal 1.00V
DMA req
AREFA
AREFB
AVCC
×
VREF
CH0DATA
CH1DATA
Reference
selection
channel
12
12
, refer to the DAC characteristics in the device data sheet.
D
A
T
A
D
A
T
A
Trigger
Trigger
CTRLB
DAC0
DAC1
Select
Select
Atmel AVR XMEGA AU
CTRLA
Figure 29-2 on page 384
Enable
Enable
Internal Output
enable
Output
Driver
Int.
driver
Output
Driver
To
AC/ADC
shows the DAC
383
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