AT90PWM81-16MF Atmel, AT90PWM81-16MF Datasheet - Page 214

• Manufacturer Part Number: AT90PWM81-16MF
• Description: IC MCU AVR 8K FLASH ISP 32QFN
• Manufacturer: Atmel
• Series: AVR® 90PWM Lightingr

Specifications of AT90PWM81-16MF

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, PWM, WDT
• Number Of I /o: 20
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 32-MLF®, QFN
• For Use With: ATSTK600-SOIC - STK600 SOCKET/ADAPTER FOR SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

17.7
214
ADC Conversion Result
AT90PWM81
Figure 17-13. 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
on page 217
selected reference voltage.
If differential channels are used, the result is:
where V
selected gain factor and V
form, from 0x200 (-512d) through 0x1FF (+511d). Note that if the user wants to perform a quick polarity
check of the result, it is sufficient to read the MSB of the result (ADC9 in ADCH). If the bit is one, the
• Quantization Error: Due to the quantization of the input voltage into a finite number of codes, a range
• Absolute Accuracy: The maximum deviation of an actual (unadjusted) transition compared to an ideal
of input voltages (1 LSB wide) will code to the same value. Always ± 0.5 LSB.
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
POS
is the voltage on the selected input pin and V
is the voltage on the positive input pin, V
and
Output Code
Table 17-4 on page
0x000
0x3FF
REF
0
the selected voltage reference. The result is presented in two’s complement
1 LSB
ADC
217). 0x000 represents analog ground, and 0x3FF represents the
=
(
---------------------------------------------------------------------- -
V
ADC
POS
NEG
–
=
REF
V
the voltage on the negative input pin, GAIN the
V
------------------------ -
NEG
IN
V
the selected voltage reference (see
V
REF
REF
⋅
) GAIN 512
1023
⋅
V
⋅
REF
Input Voltage
7734P–AVR–08/10
Table 17-3