ATxmega32A4 Atmel Corporation, ATxmega32A4 Datasheet - Page 291
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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25.3.1
25.3.2
8077H–AVR–12/09
Differential input
Differential input with gain
When differential input is selected all analog input pins can be selected as positive input, and
analog input pins 0 to 3 can be selected as negative input. The ADC must be set in signed mode
when differential input is used.
Figure 25-2. Differential measurement without gain
When differential input with gain is selected all analog input pins can be selected as positive
input, and analog input pins 4 to 7 can be selected as negative input. When the gain stage is
used, the differential analog input is first sampled and amplified by the gain stage before the
result is fed into the ADC. The ADC must be set in signed mode when differential input with gain
is used.
The gain is selectable to 1x, 2x, 4x, 8x, 16x, 32x and 64x gain.
Figure 25-3. Differential measurement with gain
ADC0
ADC1
ADC2
ADC3
ADC4
ADC5
ADC6
ADC7
ADC4
ADC5
ADC6
ADC7
ADC0
ADC1
ADC2
ADC3
ADC4
ADC5
ADC6
ADC7
ADC0
ADC1
ADC2
ADC3
1-64 X
+
-
ADC
+
-
ADC
XMEGA A
291
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