Atmel ATmega48A User Manual

4
8271D–AVR–05/11
ATmega48A/PA/88A/PA/168A/PA/328/P
The various special features of Port D are elaborated in ”Alternate Functions of Port D” on page
90.
1.1.7 AV
CC
AV
CC
is the supply voltage pin for the A/D Converter, PC3:0, and ADC7:6. It should be externally
connected to V
CC
, even if the ADC is not used. If the ADC is used, it should be connected to V
CC
through a low-pass filter. Note that PC6...4 use digital supply voltage, V
CC
.
1.1.8 AREF
AREF is the analog reference pin for the A/D Converter.
1.1.9 ADC7:6 (TQFP and QFN/MLF Package Only)
In the TQFP and QFN/MLF package, ADC7:6 serve as analog inputs to the A/D converter.
These pins are powered from the analog supply and serve as 10-bit ADC channels.

Atmel ATmega48A Specifications

General

Architecture	8-bit AVR
Flash Memory	4 KB
SRAM	512 Bytes
EEPROM	256 Bytes
Clock Speed	20 MHz
I/O Pins	23
ADC Channels	6
Operating Voltage	1.8 - 5.5 V
PWM Channels	6
USART	1
SPI	1
I2C	1
Package Type	QFN, MLF
Temperature Range	-40°C to 85°C
Packages	28-pin PDIP, 32-pin TQFP, 28-pad QFN/MLF