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ATmega64A bảng dữ liệu(PDF) 246 Page - ATMEL Corporation

tên linh kiện ATmega64A
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 64K Bytes In-System Programmable Flash
PDF  392 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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ATmega64A bảng dữ liệu(HTML) 246 Page - ATMEL Corporation

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246
8160C–AVR–07/09
ATmega64A
where V
IN is the voltage on the selected input pin and VREF the selected voltage reference (see
Table 23-3 on page 247 and Table 23-4 on page 248). 0x000 represents ground, and 0x3FF
represents the selected reference voltage minus one LSB.
If differential channels are used, the result is
where V
POS is the voltage on the positive input pin, VNEG the voltage on the negative input pin,
GAIN the selected gain factor, and V
REF the selected voltage reference. The result is presented
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 results, it is sufficient to read the MSB of the result
(ADC9 in ADCH). If this bit is one, the result is negative, and if this bit is zero, the result is posi-
tive. Figure 23-14 shows the decoding of the differential input range.
Table 23-2 shows the resulting output codes if the differential input channel pair (ADCn - ADCm)
is selected with a gain of GAIN and a reference voltage of V
REF.
Figure 23-14. Differential Measurement Range
ADC
VPOS VNEG
–
() GAIN 512
⋅⋅
VREF
------------------------------------------------------------------------
=
0
Output Code
0x1FF
0x000
V
REF/GAIN
Differential Input
Voltage (Volts)
0x3FF
0x200
- V
REF/GAIN



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