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### Topic: Arduino Uno Power (Read 3446 times)previous topic - next topic

#### Narwhal

##### Jan 20, 2011, 04:27 am
How much power would an Arduino Uno board draw if its clock cycles were being maxed out (and it had no external peripherals attached to it)?

#### retrolefty

#1
##### Jan 20, 2011, 04:43 am
The 328 datasheet would be the best source for that kind of information. http://www.atmel.com/dyn/resources/prod_documents/doc8161.pdf

In the electrical section they show this data:

Quote
Parameter Condition Min. Typ.(2) Max. Units
ICC
Power Supply Current(1)
Active 1 MHz, VCC = 2V 0.2 0.5 mA
Active 4 MHz, VCC = 3V 1.2 2.5 mA
Active 8 MHz, VCC = 5V 4.1 9 mA
Idle 1 MHz, VCC = 2V 0.03 0.15 mA
Idle 4 MHz, VCC = 3V 0.18 0.7 mA
Idle 8 MHz, VCC = 5V 0.8 2.7 mA

Not sure how one would extrapolate that out to 20Mhz @ 5v, but you can certainly see the trend.

#### Grumpy_Mike

#2
##### Jan 20, 2011, 09:14 pm
Quote
if its clock cycles were being maxed out

This is meaningles in the context of a micro controller, it is always running flat out.

#### cmiyc

#3
##### Jan 20, 2011, 09:31 pmLast Edit: Jan 20, 2011, 09:31 pm by cmiyc Reason: 1
The current of the micro-controller is only part of it.  Arduino is a system.  So you have to account for the 8u2, power LED, and regulators.

Which if there are no inputs or outputs connected, would be a steady state current.
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