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nezorg
0
Apr 14, 2015
Hey, HaaTa, do the 5V/Vss pins at the bottom of the PCB work as suppliers or only sources? It would be cool to be able to attach a battery+BT module down there, so I'm wondering. Not that it'll affect my purchase, I'm just curious :)
HaaTa
558
Input Club
Apr 14, 2015
nezorgYep, the 5 V is the direct USB supply.
There will be a bunch of debug pin changes in the shipping version (only adding, not removing any). Due to some initial power supply issues with the internal regulator we'll be moving to an external 3.3 V regulator. I'll also add a debug for this as well which could be useful to supply 3.3 V peripherals.
rjradical
3
Apr 15, 2015
HaaTaHaaTa will we be able to move the 3.3V regulator back inside if you figure out the issues or switch regulators?
HaaTa
558
Input Club
Apr 15, 2015
rjradicalSo, basically, the internal regulator does not supply enough power for the ISSI LED driver chip. Originally I was using the 5V to power the ISSI chip, but it turned out I'd need level converters to control the I2C and reset lines (even more components).
The LCD was easily powered by the internal regulator, but it just made more sense to run everything off of a single regulator with a higher max output (1A instead of 130 mA). For example, some backlit keyboards use anywhere from 400-500 mA @ 5 V so I think the external regulator is a good idea in this case.
(Would require either not fun pcb rework or a board respin to use the internal regulator)
rjradical
3
Apr 16, 2015
HaaTaThank you. If the rework is required would we have access to the PCB schematic. Soldering is not an issues.
Also, would the required rework interface with the case?
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