Luka - What segment currents are you using for the 7971 ?

If you turn all segments on at the rated datasheet current, there are 
several characters, such as 8 and Q, that will cause the total current to 
significantly exceed the max rating of 22mA. I analyzed current-draw for 
most characters, and even the average (~26mA) exceeds spec.

I scaled-back the current in my design so I never exceed the max 22mA.

7971's are really expensive & rare, so I'm not taking any chances.

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