ATMEGA324A-PU Atmel, ATMEGA324A-PU Datasheet - Page 254
ATMEGA324A-PU
Manufacturer Part Number
ATMEGA324A-PU
Description
IC MCU AVR 32K 20MHZ 40PDIP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA324A-PU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
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)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Controller Family/series
Atmega
No. Of I/o's
32
Eeprom Memory Size
1KB
Ram Memory Size
2KB
Cpu Speed
20MHz
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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22.8
8272A–AVR–01/10
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 256
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 on page 255
(ADCn - ADCm) is selected with a gain of GAIN and a reference voltage of V
164A/164PA/324A/324PA/644A/644PA/1284/1284P
Figure 22-14 on page 255
IN
POS
is the voltage on the selected input pin and V
is the voltage on the positive input pin, V
and
shows the resulting output codes if the differential input channel pair
ADC
Table 22-4 on page
shows the decoding of the differential input range.
=
(
----------------------------------------------------------------------- -
V
ADC
POS
REF
the selected voltage reference. The result is presented
–
=
V
NEG
V
--------------------------
V
IN
REF
V
) GAIN 512
⋅
REF
⋅
1024
257). 0x000 represents analog ground, and
NEG
REF
⋅
the voltage on the negative input pin,
the selected voltage reference (see
REF
.
254
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