ATxmega16D4 Atmel Corporation, ATxmega16D4 Datasheet - Page 228

• 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

8210B–AVR–04/10
V
Thus, V
Some of the internal signals need to be turned on before they can be used measured. Refer to
the manual for these modules for details of how to turn them on. The sample rate for the internal
signals is lower than the maximum speed for the ADC, refer to the ADC characteristics in the
device datasheets for details on sample rate of the internal signals.
When measuring the internal signals, the negative input is connected to internal ground in
signed mode.
Figure 20-6. Internal measurements in signed mode
In unsigned mode the negative input is connected to a fixed value which is half of the voltage ref-
erence (VREF) minus a fixed offset as it is for single ended unsigned input. Refer to
11 on page 230
Figure 20-7. Internal measurements in unsigned mode
CC
can be measured directly by scaling it down and dividing it by 10 before the ADC input.
CC
of 1.8 V will be measured as 0.18 V and V
BANDGAP REF
BANDGAP REF
VCC SCALED
VCC SCALED
for details.
TEMP REF
TEMP REF
VREF
2
−
Δ
V
CC
of 3.6 V will be measured as 0.36 V.
+
+
-
-
ADC
ADC
XMEGA D
Figure 20-
228