Discussion in "Hardware" started by    tutu10    Mar 12, 2019.
Tue Mar 12 2019, 07:13 AM
#1
Hi...

My firmware upgradable code lock seems to be ready soon :shock:
Now i use PowerPCB to build the circuit. Before that i want to ask something...

EMC is pretty nasty phenomena, which usally is forgotten when design e.g. MCU-based appliction. I had some really weird problems caused by EMI.

I found this Atmel's AppNote 042, which suggest following aids to decrease EMI. I just have problems of finding proper coil of 47nH. Can i replace it (L1) with 100nH coil? Still i wonder is L1 and C3 somekind of LC-circuit? Thus changin value of L1, may significantly decrease LC-filter efficiency or may reduce transient current too much. Shoul'd C3 value then recalculated? Am i right?
Wed Mar 13 2019, 02:32 AM
#2
Hi
I looked at
" Atmel AVR042: AVR Design Considerations " but did not
see the values you asked about.
In general ,I don't think the filter values are critical and so a 100nH coil should be okay
without changing other values.



[ Edited Wed Mar 13 2019, 07:26 AM ]

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ExperimenterUK
Thu Mar 14 2019, 08:44 PM
We don't send code,but you can ask for help in the 8051 forum
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@REVOCATUS please post in the AVR forum
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HiI looked at" Atmel AVR042: AVR Design Considera...
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Hi...My firmware upgradable code lock seems to be ...
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