MullOverThings

Useful tips for everyday

# What is the current limit of I O pins of the atmega328?

## What is the current limit of I O pins of the atmega328?

According to the ATmega328P datasheet, the total current from all I/O pins must not exceed 200mA.

## How much current can Arduino pin supply?

There are 16 digital pins on the Arduino board. They can be used as inputs or outputs. They operate at 5V and have a maximum current draw of 40mA. They have an internal pull up resistor that is disabled by default.

## What is the maximum speed of an ATmega328 microcontroller?

20 MHz
Features

Parameter Value
CPU type 8-bit AVR
Maximum CPU speed 20 MHz
Performance 20 MIPS at 20 MHz
Flash memory 32 KB

## What happens if you draw too much current from an I / O pin?

If you draw too much current (40mA or more) from an I/O pin, it will damage the pin. There are no fuses on the I/O pins. Note that if there are more than one VCC/Vin/GND pins, then the Arduino can take more current. (Each pin corresponds to a pin on the ATMega328)

## What’s the real maximum current of an ATmega328?

Everything I read says that the ATmega328 can provide 40mA per pin. However when I’ve measured the actual current provided by one pin it was showing 80mA. It was the same on every pin I tested.

## What happens if I draw too much current from my Arduino?

If you draw too much current (40mA or more) from an I/O pin, it will damage the pin. There are no fuses on the I/O pins. Note that if there are more than one VCC/Vin/GND pins, then the Arduino can take more current.

## How much current can I draw from an IO pin?

In Summary. The absolute maximum for any single IO pin is 40 mA (this is the maximum. You should never actually pull a full 40 mA from a pin. Basically, it’s the threshold at which Atmel can no longer guarantee the chip won’t be damaged.