ATxmega16D4 Atmel Corporation, ATxmega16D4 Datasheet - Page 226

• Manufacturer Part Number: ATxmega16D4
• Manufacturer: Atmel Corporation

Specifications of ATxmega16D4

• Flash (kbytes): 16 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: 4
• Twi (i2c): 2
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 12
• Adc Speed (ksps): 200
• Analog Comparators: 2
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 2
• 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: 4
• Output Compare Channels: 14
• Input Capture Channels: 14
• Pwm Channels: 14
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

20.3.2
20.3.3
8210B–AVR–04/10
Differential input with gain
Single ended input
Figure 20-2. Differential measurement
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. In addition a 1/2x (divide by two)
setting is available, enabling measurement of differential input of up to 2x the reference voltage.
Figure 20-3. Differential measurement with gain
For single ended measurements all analog input pins can be used as input. Single ended mea-
surements can be done in both signed and unsigned mode.
ADC14
ADC15
ADC0
ADC1
ADC2
ADC3
ADC4
ADC5
ADC6
ADC7
...
...
ADC14
ADC15
ADC0
ADC1
ADC2
ADC3
ADC0
ADC1
ADC2
ADC3
...
...
1-64 X
+
-
ADC
+
-
ADC
XMEGA D
226