ATMEGA32A-MNR Atmel, ATMEGA32A-MNR Datasheet - Page 222
ATMEGA32A-MNR
Manufacturer Part Number
ATMEGA32A-MNR
Description
IC MCU AVR 32K 16MHZ 44VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA32A-MU.pdf
(353 pages)
Specifications of ATMEGA32A-MNR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
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
44-VFQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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22.8
8155C–AVR–02/11
ADC Conversion Result
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 22-3 on page 222
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 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.
Table 22-2
is selected with a gain of GAIN and a reference voltage of V
Figure 22-14. Differential Measurement Range
Figure 22-14
- V
IN
POS
REF
is the voltage on the selected input pin and V
shows the resulting output codes if the differential input channel pair (ADCn - ADCm)
/GAIN
is the voltage on the positive input pin, V
shows the decoding of the differential input range.
and
ADC
Table 22-4 on page
=
(
----------------------------------------------------------------------- -
V
Output Code
0x3FF
ADC
POS
REF
0x1FF
0x000
the selected voltage reference. The result is presented
–
=
V
0
0x200
NEG
V
--------------------------
V
IN
REF
V
) GAIN 512
⋅
REF
⋅
1024
223). 0x000 represents analog ground, and
NEG
REF
⋅
the voltage on the negative input pin,
REF
the selected voltage reference (see
.
V
REF
ATmega32A
/GAIN Differential Input
Voltage (Volts)
222
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