ATtiny13A 4.8MHz

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david.prentice wrote:
Go on. The tiny13A and tiny25 seem to have similar Active, Idle and Power-Down currents....
They may seem to, but the tiny25 can consume much more current. :(

 

Both parts have their share of gotcha's.

- John

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Let me recap.  (for those that lean in that direction, there may not be much Christmas spirit described)

 

--  avrcandies posted to a year+ -old thread.  The quoted part of the thread appears to be the answer to his "question"; thus, it looks like a rant to me.

 

-- the mention of "hundreds of boards" implies an existing app to me--so how is it done now?

 

-- or is this volume app just ramping towards production?  If so, where was the question and resolution during first prototype stage?

 

--  OK, that is sour grapes; the situation arose and must now be addressed.  does a rant help?  Still, wasn't there a discussion about clocks and accuracy and calibration of the internal oscillator when the AVR model was chosen? 

 

-- What is the end aim of this snipe hunt?  Apparently it is to use the calibration value for 4.8MHz in the end app.  But what are the accuracy needs of the app?  As pointed out, the cal value only gives you +/- 10%.  Is that really much better than default OSCCAL value?  Is that really much better than using the OSCCAL value for 9.6MHz?  Take a batch of your prototype boards. measure the clock speeds.  Apply both the 4.8MHz and 9.6MHz values for OSCCAL.  Tell the resulting clock speeds.  And also tell how much each one varies from "nominal"  -- i.e. can you experimentally determine that e.g. 123 is " best" and then apply that value?

 

-- "can't do nuttin'; only a one-button programmer".  Sheesh -- then modify the one-button programmer sequence to do the job.  Either the read-and-write, or a clock signal and the unit can self-calibrate.

 

-- "What is wrong with these people?  Why aren't there air bags in my '63 Chevy?!?".  I'm an old farm boy.  And indeed there are times that one would choose to use the tractor from the '40s for a particular task.  But that tractor didn't have hydraulics and live power and high-low range and other improvements seen in tractors from the say '60s.  Extend the analogy all you like...

 

--  many posters here seem to like the Tiny13 family.  At one point, weren't they priced at giveaway prices?  Whatever; model choice needs to have a number of factors.  If 7 of 8 criteria point to the Tiny13 but the 8th does not: a rant here won't make it fit the 8th.  So you either figure out how to satisfy that last criterion or look for a model that satisfies all 8.

 

 

 

 

 

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

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???

Tiny13 @5V 0.44mA/mips

Tiny25 @5V 0.63mA/mips

 

and min. active current  300uA for tiny25 and 190 for a tiny13.

Last Edited: Sat. Dec 24, 2016 - 03:03 PM

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