ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 46

• Manufacturer Part Number: ATxmega256A3U
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3U

• Flash (kbytes): 256 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): 16
• Eeprom (bytes): 4096
• 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

Figure 27-1. ADC overview
8386A–AVR–07/11
Int. signals
Int. signals
ADC15
ADC0
ADC4
ADC7
ADC0
ADC3
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•
•
•
•
•
•
•
•
½x - 64x
Internal
Internal
signals
signals
The ADC has a compare function for accurate monitoring of user defined thresholds with mini-
mum software intervention required.
Four inputs can be sampled within 1.5µs without any intervention by the application.
The ADC may be configured for 8- or 12-bit result, reducing the minimum conversion time (prop-
agation delay) from 3.5µs for 12-bit to 2.5µs for 8-bit result.
ADC conversion results are provided left- or right adjusted with optional ‘1’ or ‘0’ padding. This
eases calculation when the result is represented as a signed integer (signed 16-bit number).
PORTA and PORTB each has one ADC. Notation of these peripherals are ADCA and ADCB,
respectively.
Internal VCC/1.6V
Internal VCC/2
Internal 1.00V
V
V
INN
INP
AREFA
AREFB
ADC
Reference
Voltage
CH0 Result
CH1 Result
CH2 Result
CH3 Result
Compare
Register
XMEGA A3U
<
>
Threshold
(Int Req)
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