F405 & F411 versions of the BluePill

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RogerClark
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Re: F405 & F411 versions of the BluePill

Post by RogerClark » Fri Dec 08, 2017 3:27 am

I updated the schematic and the PCB with the diode instead of the FET

I had to move one resistor a bit, and move a few tracks.

Hopefully what I've done is OK, but if not we can revert to the previous version.

BTW There is now more space near the diode, so we may be able to move other things to this space

I didnt change anything else, though I noticed some of the tracks could be cleaned up a bit, as they seemed to have unnecessary small kinks in them.

Please download it and let me know if I've stuffed up or not ;-)
PS. DRC seems OK (no errors) and I looked in the 3D viewer and there seemed to be enough space between the diode and the regulator

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Squonk42
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Re: F405 & F411 versions of the BluePill

Post by Squonk42 » Fri Dec 08, 2017 5:54 am

victor_pv wrote:
Fri Dec 08, 2017 2:01 am
I just found the perfect component for the job, MAX40200, but is not worth it, can't find it in aliexpress, and in mourser costs $0.5.
I mentioned it in a previous post, but it is too exotic and expensive.

And we don't have the room to fit the additional dual transistor and 2 more resistors to have a current mirror like the RPi, so either we put an Ss12 Schottky diode or we put nothing like the origial Bluepill.

I will check Roger's additions.

Regarding the track clean up, this may be intentional in order to accomodate for the teardrops (smooth junction between track and pad to remove stress caused by etchint sharp corners), I had to turn some segments to pass DRC. But of course, it may happen that I forgot to optimize some tracks too!

For the teardrops, you have to duplicate the PCB just before generating the gerber files and run an automatic script that will add them with no way back, then panelize the result, hopefully with the tool found by @racemaniac to get the result above (this was in EagleCAD).

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RogerClark
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Re: F405 & F411 versions of the BluePill

Post by RogerClark » Fri Dec 08, 2017 6:23 am

OK.

I moved R1 a bit, but in hindsight, I can now move it back to the left a bit.

I initially tried to have D3 closer to the regulator and needed to move R1 but looking in the 3D view they looked unnecessarily close

So I moved the track from PA11 to USB DM, to allow D3 to move even further away from the regulator if necessary.

I also moved the tracks and vias on PB12 and PB13 to make more room for D3

PA11 and P12 tracks can be moved down even more as could PB12 and PB13 if we needed space next to D3 for anything else


Arggghh.

I just noticed a stub of the 3.3V track, sticking out. I'll remove it ...

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RogerClark
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Re: F405 & F411 versions of the BluePill

Post by RogerClark » Fri Dec 08, 2017 7:43 am

diode.jpg
diode.jpg (198.16 KiB) Viewed 79 times
Untitled-1.jpg
Untitled-1.jpg (231.84 KiB) Viewed 79 times

racemaniac
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Re: F405 & F411 versions of the BluePill

Post by racemaniac » Fri Dec 08, 2017 7:46 am

you've got a useless piece of 5V track sticking out on the top left of your picture :)

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RogerClark
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Re: F405 & F411 versions of the BluePill

Post by RogerClark » Fri Dec 08, 2017 9:36 am

Umm

OK.

I'll need to check why that track is there. I didnt add it and I can't see what it would have been connecting to

Edit

I checked and I've somehow lost 5V pad which was at the end of that track.

I'll reinstate the track and that pad

BTW.

I can't see why VCAP1 and PB2 tracks are routing around something, which I can't see
VCAP1_PB2.png
VCAP1_PB2.png (47.93 KiB) Viewed 69 times
If they can be moved down a bit, the capacitor C12 , just below PB1 and PB0 could be moved to the right, and the 5V moved to between PB0 and PA7. which would mane the Via on VBUS_EN next to R7 could be moved to the right of R7 in between R7 and C12, so the track on PB11 would not need to go around it

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RogerClark
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Re: F405 & F411 versions of the BluePill

Post by RogerClark » Fri Dec 08, 2017 10:08 am

I screwed up big time

I've removed U1 not Q1

Apologies

I'll try to fix it now

racemaniac
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Re: F405 & F411 versions of the BluePill

Post by racemaniac » Fri Dec 08, 2017 10:19 am

RogerClark wrote:
Fri Dec 08, 2017 10:08 am
I screwed up big time

I've removed U1 not Q1

Apologies

I'll try to fix it now
lol, that happens :)
it's great to see us working together towards this :). i was hoping someone else would pick up the pcb development, so this weekend i can focus on writing software for my saber boards :)
i've got multiple simultaneous files streaming from an sd card working pretty well :D (still some last bugs/details to finish, and somewhere in the future do yet another rewrite as i'm now finally coming close to an API i like, and a feature set that makes sense for what i'm trying to do :) ).
got my board playing 4 48khz stereo wavs from the sd card, and mixing them together :D.

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Squonk42
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Re: F405 & F411 versions of the BluePill

Post by Squonk42 » Fri Dec 08, 2017 10:23 am

No problem, I just did git revert <SHA1> in my local repository :?

I should have some time this WE to browse through the TODO list.

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RogerClark
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Re: F405 & F411 versions of the BluePill

Post by RogerClark » Fri Dec 08, 2017 10:27 am

OK after that massive stuff-up

I've reverted back to before I started

I'm going to need to move a lot of components

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