ATmega3250 Atmel Corporation, ATmega3250 Datasheet - Page 211
ATmega3250
Manufacturer Part Number
ATmega3250
Description
Manufacturer
Atmel Corporation
Specifications of ATmega3250
Flash (kbytes)
32 Kbytes
Pin Count
100
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
69
Ext Interrupts
25
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
2
Eeprom (bytes)
1024
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
4
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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Quantity
Price
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Quantity:
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23.7
2570N–AVR–05/11
ADC Conversion Result
•
Figure 23-13. Differential Non-linearity (DNL)
•
•
After the conversion is complete (ADIF is high), the conversion result can be found in the ADC
Result Registers (ADCL, ADCH).
For single ended conversion, the result is
where V
Table 23-3 on page 213
0x3FF represents the selected reference voltage minus one LSB.
Differential Non-linearity (DNL): The maximum deviation of the actual code width (the
interval between two adjacent transitions) from the ideal code width (1 LSB). Ideal value: 0
LSB.
Quantization Error: Due to the quantization of the input voltage into a finite number of codes,
a range of input voltages (1 LSB wide) will code to the same value. Always ± 0.5 LSB.
Absolute Accuracy: The maximum deviation of an actual (unadjusted) transition compared
to an ideal transition for any code. This is the compound effect of offset, gain error,
differential error, non-linearity, and quantization error. Ideal value: ± 0.5 LSB.
IN
is the voltage on the selected input pin and V
Output Code
0x000
0x3FF
and
0
Table 23-4 on page
1 LSB
ADC
ADC
=
(
---------------------------------------------------- -
=
V
ATmega325/3250/645/6450
POS
V
--------------------------
IN
V
–
⋅
REF
V
V
1024
214). 0x000 represents analog ground, and
REF
NEG
REF
) 512
⋅
the selected voltage reference (see
V
REF
Input Voltage
211
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