Would set the 2.56V reference for attiny 25 and attiny 8, but really should add a define, and might be different in attiny13, and needs changing in a couple of places and might interfere with temperature readings (but I don't think so, it's got separate code), etc... So doable, but not quite just flipping a switch.
Anyway that line and the details behind it confirms that the way things are setup now is for 1.1v, so I agree, that's what we should use for now at least.
The only question then is what total resistance to aim for for acceptable drain current. is 95k enough or should we double R2 and bring it all up to the 200k range? I don't like 900k.
Well sure it is, exactly inverse proportional. Ok, I think 11k and 220k was good when I checked. No time to run the numbers now, but something very close to that is good.
We missed one. According to your LDO TA series docs, C2 should be 10uF when using an LDO, which makes sense. This one at least is low voltage, so really doesn't need to be physically larger. This is why we waited a few days. Updates coming soon.
Well rats, so yeah, C2 is only available in 6.3V X5R in a 10uF 0603. Price isn't bad at 0.13 per one. Your usual comment TA is that an 0805 will fit there. Is that still true in this one? It looks possible to slide C1 north about a mm, if it goes back to not jumping the trace (trace turns between c1 and c2). Is there room to squeeze an 0805 on as it is?
On the other hand, X5R is probably ok. There's an X7t also. Not sure which is better, probably makes little difference. In the long run, it looks like C1's are headed toward 0805 with this new OTC trick. sigh. There is a way, to even get the footprint, moving the trace between them, and then sliding C1 left a bunch. I know you don't want to make that a long trace. If we can just have enough clearance to fit an 0805 on the 0603 pad, that's good enough too though.
Ok, I knew it would fit the pads, but was worried there wasn't room here for the overhang. I'm thinking of dropping the clickie R1/R2 reccomendations for now since a) there's no clickly application for this in its current form I guess, b) the new OTC is going to make changing the resistors irrelevant anyway if it pans out. I wrote it up just for it to be there for later, but now it's not clear what later will look like anyway.
I don't understand. If the case hits a battery pad that's a short with or without the ground ring there. The case is going to be at battery ground now either way. Could just make the battery pads a little smaller.