ATMEGA329P-20MN Atmel, ATMEGA329P-20MN Datasheet - Page 223

• Manufacturer Part Number: ATMEGA329P-20MN
• Description: IC MCU AVR 32K 20MHZ 64QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA329P-20MN

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-MLF®, 64-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

22.8
8021G–AVR–03/11
ADC Conversion Result
• Differential Non-linearity (DNL): The maximum deviation of the actual code width (the interval
Figure 22-13. Differential Non-linearity (DNL)
• Quantization Error: Due to the quantization of the input voltage into a finite number of codes, a
• Absolute Accuracy: The maximum deviation of an actual (unadjusted) transition compared to
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 3 on page 225
represents the selected reference voltage minus one LSB.
between two adjacent transitions) from the ideal code width (1 LSB). Ideal value: 0 LSB.
range of input voltages (1 LSB wide) will code to the same value. Always ± 0.5 LSB.
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
and
0x000
0x3FF
Table 22-3 on page
0
1 LSB
ADC
ADC
=
(
---------------------------------------------------- -
=
V
POS
226). 0x000 represents analog ground, and 0x3FF
V
--------------------------
IN
V
–
⋅
REF
V
V
1024
REF
NEG
REF
) 512
ATmega329P/3290P
⋅
the selected voltage reference (see
V
REF
Input Voltage
223