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AT90PWM2 Datasheet(PDF) 246 Page - ATMEL Corporation

Part # AT90PWM2
Description  High Performance, Low Power Atmel
PDF  365 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90PWM2 Datasheet(HTML) 246 Page - ATMEL Corporation

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4317K–AVR–03/2013
AT90PWM2/3/2B/3B
Figure 21-14. Differential Measurement Range
Example 1:
–
ADMUX = 0xED (ADC3 - ADC2, 10x gain, 2.56V reference, left adjusted result)
–
Voltage on ADC3 is 300 mV, voltage on ADC2 is 500 mV.
–
ADCR = 512 * 10 * (300 - 500) / 2560 = -400 = 0x270
Table 21-2.
Correlation Between Input Voltage and Output Codes
VADCn
Read code
Corresponding decimal value
V
ADCm + VREF /GAIN
0x1FF
511
VADCm + 0.999 VREF /GAIN
0x1FF
511
VADCm + 0.998 VREF /GAIN
0x1FE
510
...
...
...
VADCm + 0.001 VREF /GAIN
0x001
1
VADCm
0x000
0
V
ADCm - 0.001 VREF /GAIN
0x3FF
-1
...
...
...
VADCm - 0.999 VREF /GAIN
0x201
-511
V
ADCm - VREF /GAIN
0x200
-512
0
Output Code
0x1FF
0x000
V
REF
Differential Input
Voltage (Volts)
0x3FF
0x200
- V
REF
/Gain
/Gain



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