05-03-2016, 02:04 PM
(05-02-2016, 12:18 PM)tkaiser Wrote:(05-02-2016, 11:47 AM)rahlquist Wrote: What you may want to do is find a stabilized supply that outputs more than 5v (say 9v) stable and the use a normal adjustable DC-DC converter for the final tweak
But that's what a stabilized step-down converter is for. And the additional 3.7V battery is for situations when the PMU decides that 5V DC-IN is insufficient (need not be that large since it's only about buffering temporary voltage drops).
That's the nice thing when you use a SoC that is accompanied by a PMU with battery support. The PMU switches between different power sources on demand. That's why something like a Banana Pi or a Pine64 is superiour as car computer compared to something like a Raspberry or an Orange Pi since the former come with AXP209 or AXP803 and battery support. And that's all that's needed.
Man, you're an electrical haxor. I'm a software developer, and pretty comfortable with basic sysadmin and building computers, but I'm nearly completely ignorant of basic electronics and electrical topics.
Anyway, it looks like an 18650 battery is 3.7v; will one of those work? I have several rechargable ones laying around (for flashlights). And that converter you linked me to on Amazon should work hey? Nice and cheap too!
My car has only a single cigarette lighter. I wonder if it would be possible to buy one of those cigarette lighter -> USB plugs that goes into the cig lighter and gives you two USB ports. Then power the Pine64 and LCD touchscreen (I'm guessing the official 7" one from the P64 store) from that?