The Dragon user guide states it works with AT32UC3B0512 REV. C . I guess the MCU is now at a later REV., will the dragon still work on, if that's true ?
Using Dragon with AT32UC3B0512
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Yes. Later Revisions ussually only fix errata I think.
Thank you, Stypie. Where'd you get your AT32UC3C2512C ( they're impossible to find !! ) ?
He he :) Yes... I know :)
I connected with my local distributor, and been honest with him about my needs, so he asked atmel and atmel approved.
But, the datasheet is not written so clear as atmel is used to write it. That is a bit frustrating.
I red the ADC chapter several times and still don't know can it measure 5V, or only 3.5V.
Thanks about that. Why are these 32 bitters so hard to find ?
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I red the ADC chapter several times and still don't know can it measure 5V, or only 3.5V.
From the ADC and electrical chars. sections, only up to ( 3.5 - 0.7 )V using external ref. and 0.6*5.5V = 3.3V for one of the int. ref. But I agree, they didn't make it as clear / easy as it should be !!!
They are still in testing phase. I think thats the reason. Datasheet is still missing some values which will be written after testing.
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only up to ( 3.5 - 0.7 )V using external ref
Well.. it says min(3.5, VDDANA - 0.7). That should mean lower value of 3.5, or VDDANA-0.7. That sets the upper limit of 3.5V
I agree with your calculation for Internal reference 2 which is 0.6*VDDANA.
But what I don't know how to understand is this: when CFG.EXREF bit is set, that will force differential reference and disregard CFG.RS selection, so ADC will use ADCREFP/ADCREFN as references. (page 1110)
That could possibly mean that if I set ADCREFP to 5V, and ADCREFN to GND, that I can get 5V range... but I can't find maximum ADCREFP-ADCREFN in datasheet :)
You see what Im going through... :)
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Section 40, it's 5.5V.
...but I can't find maximum ADCREFP-ADCREFN in datasheet
Which page ?
section 40, pg 1243 . But I see your confusion about those 2 pins, they don't openly give their voltage specs. The way to think about it is, since VddAna max = 5.5 V, that means ALL analog modules can take that stress including ANY Vref pins. BUT, if you want a single ended type input , I think you just use one of the regular external 5V Vrefs. Using the diff. Vref pins means an independent ( floating ? ) Vref source is connected to those 2 pins, IMHO ( makes my head hurt as I don't understand what advantage it has over the regular Vref pin ).
Last Edited: Thu. Mar 10, 2011 - 10:12 AM
You see...what a headache :)
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No, upper limit is ( VddAna= 5.5 - 0.7 ) V using the regular ext. Vref pins.
VDDANA-0.7. That sets the upper limit of 3.5V