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Is the silkscreen wrong on the power connector?
Posted: 30 Jun 2020 22:24
by derkom
Is the PWR2 connector on the TF536 labelled backwards?
The pin labelled GND definitely appears to be connected to VCC on the 68k, and +5V is connected to the ground plane on the board.
Possibly this problem was referenced here?
Edit: Text kept for posterity and appropriate levels of embarrassment for myself. Do not pay any attention to this. I was wrong. Silkscreen is correct.
Re: Is the silkscreen wrong on the power connector?
Posted: 30 Jun 2020 22:37
by terriblefire
Very probably.
Dont trust my silkscreens.
Re: Is the silkscreen wrong on the power connector?
Posted: 01 Jul 2020 00:32
by PaulJ_2.0
Silkscreen is fine. I program the CPLDs with that polarity, so it must be correct.
Re: Is the silkscreen wrong on the power connector?
Posted: 01 Jul 2020 01:47
by go0se
The power labels on the 536 rev2b are correct, TF fixed this on an earlier revision. The image is deceiving as +5V looks like it is surrounded by GND but is actually connected to an internal power layer. The +5V on the 68K is connected to GND via a decoupling/smoothing capacitor, not directly.
Re: Is the silkscreen wrong on the power connector?
Posted: 01 Jul 2020 06:58
by derkom
go0se wrote: 01 Jul 2020 01:47
The power labels on the 536 rev2b are correct, TF fixed this on an earlier revision. The image is deceiving as +5V looks like it is surrounded by GND but is actually connected to an internal power layer. The +5V on the 68K is connected to GND via a decoupling/smoothing capacitor, not directly.
Oh gosh, this is why I shouldn't work too late at night. :blonde: Of
course that is a decoupling cap, and for some reason I just didn't realise it last night.
Apologies to all. :oops: Nobody listen to this thread and accidentally hook it up backwards. :lol:
Re: Is the silkscreen wrong on the power connector?
Posted: 01 Jul 2020 08:25
by PaulJ_2.0
derkom wrote: 01 Jul 2020 06:58
Apologies to all. :oops: Nobody listen to this thread and accidentally hook it up backwards. :lol:
No worries there Pal, there isn't one of us that hasn't popped a board with the wrong polarity :)