ATMEGA324P-15AZ Atmel, ATMEGA324P-15AZ Datasheet - Page 256
ATMEGA324P-15AZ
Manufacturer Part Number
ATMEGA324P-15AZ
Description
MCU AVR 32K FLASH 15MHZ 44-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA324P-15AZ
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 ~ 125°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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21.8
256
ADC Conversion Result
ATmega164P/324P/644P
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 21-3 on page 258
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 21-2 on page 257
(ADCn - ADCm) is selected with a gain of GAIN and a reference voltage of V
Figure 21-14 on page 257
IN
POS
is the voltage on the selected input pin and V
is the voltage on the positive input pin, V
ADC
and
shows the resulting output codes if the differential input channel pair
Table 21-4 on page
=
shows the decoding of the differential input range.
----------------------------------------------------------------------------- -
V
POS
ADC
REF
–
the selected voltage reference. The result is presented
V
=
NEG
V
---------------------------- -
V
IN
REF
V
REF
1024
GAIN
259). 0x000 represents analog ground, and
NEG
REF
the voltage on the negative input pin,
512
the selected voltage reference (see
REF
.
7674F–AVR–09/09
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