The holes are used for programming “acupuncture style”.
Interesting, I didn’t know TK was looking at the 1634. Hard to follow everything that’s going on here. Nice to hear, I’ve been using the 1634 for quite some time now but no one else seemed interested in using it. I made some 1634 drivers back in March 2017: Mike C drivers: v8 series, ATtiny1634 based.
Aha, I didn’t know that. I’ve built a few and they all turn on lower than 2.7V, but probably not fully as you say. I’m all ears when it comes to these things. Do you have another suggestion? In regards to it’s PWM characteristics, I don’t care at all because I don’t use PWM on it. I only use it for full blast on, I have the CN571x regulators for lower modes.
It actually isn’t there for reverse polarity protection, even if it does that too. It’s there for the OTSM cap. But once again, I’m all ears for these things. Will a Pfet prevent OTSM cap drain? No reverse leakage? The diode does a good job of it. In my calibration and voltage reading I have a simple compensation routine for the voltage drop over the diode. Sure, it’s not perfect calibration, but during my tests with other methods of calibrating voltage, perfection is not easily obtained anyway. I have about 5% tolerance, I’m totally fine with that. Still, interested in the Pfet solution, I’d surely need to test it to make sure it doesn’t leak the OTSM cap. If it’s just a simple component replacement and I can fit it, no reason not to implement it in future versions.