![]() If only USBVCC was connected to UVCC, and VCC was disconnected from the 5V bus, would 5V still come out of the VCC pin?ĮDIT2: Ok, I think I see on the datasheet that 3.3V will come out of VCC if it is not pulled up by another source. Arduino Mega 2560 Rev3 Pinout, Atmega2560 Pin Mapping, EAGLE Files, Schematics, and More Here you will find all of the technical documentation and support files for the Arduino Mega 2560 Revision 3. Yes, its VCC is connected to the 5V bus.ĮDIT: I'm still confused about this though. Arduino Mega 2560 Rev3: SKU: A000067: Microcontroller: ATmega2560: USB connector: USB-B: Pins Built-in LED Pin: 13: Digital I/O Pins: 54: Analog input pins: 16: PWM pins: 15: Communication UART: Yes, 4: I2C: Yes: SPI: Yes: Power I/O Voltage: 5V: Input voltage (nominal) 7-12V: DC Current per I/O Pin: 20 mA: Supported battery: 9V battery: Power. The schematic you linked shows USBVCC connecting directly to UVCC on pin 31 of the Atmega16U2. The USBVCC voltage from the USB connector goes only to one place, the T1 FET switch. You must be looking at a different schematic then I am? The 16U2 chip has it's Vcc on chip pin 4 and it clearly wires to the board's +5V bus, not to the USBVCC bus. ![]() The board accommodates the ATmega2560 microcontroller, which operates at a frequency of 16 MHz. Arduino UNO R3 open source schematic Arduino Mega 2560 processing board. Arduino Mega 2560 is an exemplary development board dedicated for building extensive applications as compared to other maker boards by Arduino. Now I see that it's connected to the MOSFET down below as well. R3 OPEN SOURCE SCHEMATIC The entire line of Arduino products is based on the. ![]() Seems silly, but this is the only thing that made sense to me, because the 16U2 is the only thing I saw USBVCC connected to. With 54 digital I/O pins, 16 analog inputs and a larger space for your sketch it is the recommended board for 3D printers and robotics projects. For some reason I had it in my mind that power came in through UVCC on the 16U2, was regulated there and came out of it's VCC port to supply the 5V line. The Arduino MEGA 2560 is designed for projects that require more I/O lines, more sketch memory and more RAM.
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