I'd think I've seen as many AVR8 models as nearly anyone. But this one has me stumped.
A redesign of sorts is needed on one of our industrial control modules, as there appears to be cross-talk between channels. Each channel has sensor excitation and return value that goes into the AVR8 ADC.
The redesign will isolate the excitation of each of the four channels. To "isolate" the returned signal we want to use differential ADC pairs for each channel.
What AVR8 model has four distinct differential ADC channel pairs, plus four single-ended? Tiny861A family has that but more on that later...
A complication is that the module communicates to the master via RS485 and MPCM/9-bit. The Tiny861A has the USI, but no 9-bit provisions. Tiny1634 has USART(s), but no differential. Current design is Mega164--that has differential but only two distinct pairs.
Any suggestions? (product selector is useless for this...been there)