Can I substitute Attiny841 for Attiny85

[bigjoncoop]

hey fellaz,

i was able to purchase a bunch of Attiny841 IC's recently. I found a diy project that's using a Attiny85 and was wondering if could use the Attiny841 instead with out any modification?

and does anyone know of a chart or simple way to easily determine if which attiny and be substituted for which?

[MarkF]

I haven't worked with the ATtiny families.
You just have to search the datasheets.

However, I will let you answer your own question:

[hans]

No those parts have 2 different datasheets.

You can probably port over many peripherals, as they will be coded similar or even use the same register layout but with slight deviations.

[Kleinstein]

The Atiny841 has a different number of pins with supply at non compatible pins - so there have to be HW changes.
The SW side would very likely also need changes. Here at least the pheriphery is still very similar (though 16 bit timers instead of 8 bit ones). So the port of the SW should be resonable simple, but still a little work and the code may end up slightly longer.

[bigjoncoop]

@Kleinstein
@hans
@MarkF

Thanks for your replys.

But i should have explained my question better. I realize they have different amount of pins and pinout.
What I should have asked is, can I run the same sketch / code on them.

[sleemanj]

That all depends on the code.

Since you say "sketch" then I would guess we are talking about Arduino.  When using an appropriate core (https://github.com/SpenceKonde/ATTinyCore) then high level functions and libraries will **probably** work.

Low level stuff will probably **not** work, as registers and so forth will be different.

[westfw]

All that said, the tiny841 has MORE features than the tiny85, except for the high speed timer clocking.  So it should be easier to get a t85 sketch working on an 841 than the other way around.