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Author Topic: ATmega 328-PU vs ATmega 328P-PU  (Read 3473 times)
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Leighton Buzzard, UK
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read the title carefully! - just one P difference
my question is - does it matter?

as far as I can tell the only difference is support for pico power and brown out detection
the P-PU does, the -PU doesn't

but if I don't want to use either, will both chips work ok?

any bootloader issues?

thanks
Mike
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Scotland
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Hi Mike, For all purposes they are the same - the signatures MAY be different (looking that up now)
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Drew.
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ATmega328   0x1E 0x95 0x14
ATmega328P 0x1E 0x95 0x0F
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Drew.
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Leighton Buzzard, UK
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many thanks
I was hoping someone would say that!
cheers
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Anchorage, AK
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There have been recent (last week or so) threads on the problems you'll run into during bootloading.  (Easiest fix, IMO, is to add another signature entry into avrdude.conf and boards.txt.)  Once it has your bootloader on it, it acts exactly like an Uno (or whatever).
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Grand Blanc, MI, USA
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as far as I can tell the only difference is support for pico power and brown out detection
the P-PU does, the -PU doesn't

Both have the BOD, but it can only be disabled on the 328P. But if ultra-low-power sleep modes aren't a requirement, then macht nichts.

I'm not sure the datasheet gets it completely right, Tables 29-8 and 29-9 show the same power-down current, 0.1µA typical, yet the BOD will draw ~22µA at 5V and 25C. Similarly, the charts in sections 30.7.4 and 30.8.4 look suspiciously alike.
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Leighton Buzzard, UK
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thanks all
in the end I found P-PU cheaper then -PU so problem went away smiley
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Where you getting them? I'm starting to run out!!
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Drew.
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Leighton Buzzard, UK
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Funny enough RS!
Mike
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