ATxmega32A4 Atmel Corporation, ATxmega32A4 Datasheet - Page 290
ATxmega32A4
Manufacturer Part Number
ATxmega32A4
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega32A4
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 Speed
No
Usb Interface
No
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
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25.3
8077H–AVR–12/09
Input sources
An integrated temperature sensor is available and the output from this can be measured with the
ADC. The output from the DAC, VCC/10 and the Bandgap voltage can also be measured by the
ADC.
Figure 25-1. ADC overview
The input sources for the ADC are the analog voltage inputs that the ADC can measure and
convert. Four types of measurements can be selected:
The analog input pins are used for single ended and differential input, while the internal inputs
are directly available inside the device. In devices with two ADCs, PORTA pins can be input to
ADCA and PORTB pins can be input to ADCB. For XMEGA devices with only one ADC but with
analog input pins on both PORTA and PORTB, both PORTA and PORTB analog pins can then
be used as input.
The MUX Control registers select which input that is converted and the type of measurements in
one operation. The four types of measurements and their corresponding MUXes are shown in
Figure 25-2 on page 291
The ADC itself is always differential, also for single ended inputs where the negative input for the
ADC will be connected to an fixed internal value.
• Differential input
• Differential input with gain
• Single ended input
• Internal input
Channel 0 MUX selection
Channel 1 MUX selection
Channel 2 MUX selection
Channel 3 MUX selection
to
1-64 X
Figure 25-6 on page
Reference selection
Configuration
ADC
triggers
293.
Event
Channel 0 Result
Channel 1 Result
Channel 2 Result
Channel 3 Result
Register
Register
Register
Register
XMEGA A
290
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