ATMEGA325A-AU Atmel, ATMEGA325A-AU Datasheet - Page 225
ATMEGA325A-AU
Manufacturer Part Number
ATMEGA325A-AU
Description
IC MCU AVR 32K FLASH 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA325A-AU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
54
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
64-TQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Manufacturer
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22.8
8285B–AVR–03/11
ADC Conversion Result
ATmega165A/165PA/325A/325PA/3250A/3250PA/6
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 227
0x3FF represents the selected reference voltage minus one LSB.
Figure 22-14. Differential Measurement Range
IN
- V
is the voltage on the selected input pin and V
REF
and
Table 22-4 on page
ADC
Output Code
0x3FF
ADC
0x1FF
0x000
0x200
=
0
(
---------------------------------------------------- -
=
V
POS
V
--------------------------
IN
V
–
⋅
REF
V
V
1024
228). 0x000 represents analog ground, and
REF
NEG
REF
) 512
⋅
the selected voltage reference (see
V
REF
Differential Input
Voltage (Volts)
225
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