I am trying to find the maximum allowable current for both the Nano33 as well as the standard 5V Nano's.
How do I go about finding this information. It does not seam to be in the spec sheet. All I have found is internet hearsay with numbers of 7ma to 40 ma. Since I need to run in the 10ma to 20ma range,I really need to know. Is there any reason this isn't published in the spec sheets?
Yes because it is complex. In the data sheet for the processor they show the absolute maximum current. That is a stress rating not a recommended working rating. Also in combination with the other pins there are limits in the total current that can safely drawn from all pins, these are often less. So there is a judgement call involved. There is no simple answer to your question.
Thanks. I actually did find it and don't know how I missed it. But I also looked up the specs on the microchip and they say 40ma vs the Nano 20ma. My guess is the Nano de-rates it for multiple pins but I assume that is only a first starting point. And I may be able to assume that I can safely put 20ma on 2 pins but beyond that I'm on my own.
For the Nano 33 I found 15ma. I down loaded the data sheet for the chip but haven't found the I/O pin current yet among the 600 pages. I'm sure I will find it and my guess is it will be ~ 30ma per pin.
Thanks for the help.
No, if you look at the * under the table you posted there are words to the effect that
These are stress ratings and functionality is not guaranteed. Long term exposure to these readings will cause damage.
All the other parameters quoted are for 20mA pin current, if you look under the * for those tables you will see the conditions for multiple pins.
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