AT90USB1286-16MU ATMEL [ATMEL Corporation], AT90USB1286-16MU Datasheet - Page 328
![no-image](/images/no-image-200.jpg)
AT90USB1286-16MU
Manufacturer Part Number
AT90USB1286-16MU
Description
Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.AT90USB1286-16MU.pdf
(434 pages)
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AT90USB64/128
where V
Table 25-3 on page 330
0x3FF represents the selected reference voltage minus one LSB.
If differential channels are used, the result is:
where V
GAIN the selected gain factor and V
in two’s complement 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 result is negative, and if this bit is zero, the result is posi-
tive.
Table 82 shows the resulting output codes if the differential input channel pair (ADCn - ADCm) is
selected with a reference voltage of V
Figure 25-14. Differential Measurement Range
Figure 25-14
IN
POS
- V
is the voltage on the selected input pin and V
REF
is the voltage on the positive input pin, V
shows the decoding of the differential input range.
and
Table 25-4 on page
ADC
REF
Output Code
REF
0x3FF
ADC
=
the selected voltage reference. The result is presented
0x1FF
.
0x000
0x200
(
----------------------------------------------------------------------- -
V
=
POS
0
V
--------------------------
IN
V
–
⋅
REF
330). 0x000 represents analog ground, and
V
1023
NEG
NEG
V
REF
REF
) GAIN 512
⋅
the voltage on the negative input pin,
the selected voltage reference (see
⋅
V
REF
7593A–AVR–02/06
Differential Input
Voltage (Volts)
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