Arduino A000066 User Manual

Arduino® UNO R3
6 / 13 Arduino® UNO R3 / Rev. 01 - 25/11/2021
3.2 Processor
The Main Processor is a ATmega328P running at up tp 20 MHz. Most of its pins are connected to the external
headers, however some are reserved for internal communication with the USB Bridge coprocessor.
3.3 Power Tree
Power tree

Arduino A000066 Specifications

General

Microcontroller	ATmega328P
Operating Voltage	5V
Input Voltage (recommended)	7-12V
Input Voltage (limit)	6-20V
Digital I/O Pins	14
PWM Digital I/O Pins / Channels	6
Analog Input Pins	6
DC Current per I/O Pin	20 mA
DC Current for 3.3V Pin	50 mA
Flash Memory	32 KB (ATmega328P) of which 0.5 KB used by bootloader
SRAM	2 KB (ATmega328P)
EEPROM	1 KB (ATmega328P)
Clock Speed	16 MHz
Length	68.6 mm
Width	53.4 mm
Weight	25 g