ATxmega64A4U Atmel Corporation, ATxmega64A4U Datasheet - Page 358
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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28.5
28.6
8331A–AVR–07/11
Voltage reference selection
Conversion Result
channels. This can help reduce software complexity, by allowing different software modules to
start conversions and read conversion results fully independently of each other.
The following voltages can be used as the reference (VREF) for the ADC:
•
•
•
•
•
Figure 28-8. ADC voltage reference selection
The result of the analog to digital conversion is written to the corresponding Channel result reg-
isters, RES. The ADC is either in signed or in unsigned mode. This setting is global for the ADC
and all ADC channels.
In signed mode, negative and positive results are generated. Signed mode must be used when
any of the ADC Channels are set up for differential measurements. In unsigned mode only sin-
gle ended or internal signals can be measured. With 12-bit resolution, the TOP value of a signed
result is 2047 and the results will be in the range -2048 to +2047 (0xF800 - 0x07FF).
The ADC transfer function can be written as:
VINP and VINN are the positive and negative inputs to the ADC.
For differential measurements GAIN is 1-64. For single ended and internal measurements GAIN
is always 1 and VINP is internal Ground.
In unsigned mode, only positive results are generated. The TOP value of of an unsigned result is
4095 and the results will be in the range 0 to +4095 (0x0 - 0x0FFF).
The ADC transfer functions can be written as:
VINP is the single ended or internal input.
ADC can be configured to generate either an 8-bit or a 12-bit result. A result with lower resolu-
tion will be available faster. See the
description on the propagation delay.
Accurate internal 1.00V voltage generated from the Bandgap
Internal V
Internal V
External voltage applied to AREF pin on PORTA
External voltage applied to AREF pin on PORTB
RES
RES
=
VINP - VINN
-------------------------------- - GAIN
CC
CC
=
/1.6V voltage
/2V voltage
VREF
VINP - (-ΔV )
--------------------------------- -
VREF
⋅
Internal VCC/2.0V
Internal VCC/1.6V
⋅
(
Internal 1.00V
TOP +1
⋅
(
TOP +1
AREFA
AREFB
)
)
”ADC Clock and Conversion Timing” on page 360
Atmel AVR XMEGA AU
VREF
for a
358
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