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 » Thu Dec 07, 2017 9:47 pm

OK

I'll change the name of the library symbol from 1N5812 to SS12 (its the same visual symbol) , and use the D_SMA footprint

racemaniac
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Re: F405 & F411 versions of the BluePill

Post by racemaniac » Thu Dec 07, 2017 9:48 pm

Squonk42 wrote:
Thu Dec 07, 2017 9:35 pm
AFAICT, it corresponds to the "D_SMA" footprint in the "Diodes_SMD" footprint library in Kicad. But in general I prefer to use my old trusted footprints rather than using an existing one that I have not checked against the real thing. One thing that makes me suspect problems is the "D_SMA_Handsoldering" variant...
KiCad has a lot of handsoldering variants for smd components. I assume it's just some bigger pads so you can more easily solder them with your soldering iron. I always use the regular pads as i use solder paste & stencil (and since space is tight XD)

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RogerClark
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Re: F405 & F411 versions of the BluePill

Post by RogerClark » Thu Dec 07, 2017 9:53 pm

@racemanic

I presumed the same thing about "hand soldering" versions, but never took the time to look

I do recall selecting them sometimes when I know the board is actually going to be hand soldered, i.e I did some boards for a small company and they didnt have their SMD reflow setup to start with, so as there was plenty of room on the PCB they wanted everything to be big SMD e.g. 1206 sizes for R and C and LEDs, so that they could be hand soldered.

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Re: F405 & F411 versions of the BluePill

Post by racemaniac » Thu Dec 07, 2017 10:07 pm

RogerClark wrote:
Thu Dec 07, 2017 9:53 pm
@racemanic

I presumed the same thing about "hand soldering" versions, but never took the time to look

I do recall selecting them sometimes when I know the board is actually going to be hand soldered, i.e I did some boards for a small company and they didnt have their SMD reflow setup to start with, so as there was plenty of room on the PCB they wanted everything to be big SMD e.g. 1206 sizes for R and C and LEDs, so that they could be hand soldered.
just did a quick check with the SMA diode footprint: it's indeed pads that extend beyond the diode so it can easily be soldered with an iron.

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Squonk42
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Re: F405 & F411 versions of the BluePill

Post by Squonk42 » Thu Dec 07, 2017 10:50 pm

I just received today some preliminary PCBs from SeedStudio, with my own "milling + mice bites" panelization: only $15.05 for 5 10x10 cm PCBs, 1.2 mm thick with Blue solder mask, each contains 5 boards, so this is 50 boards for $15.05 or $0.301 each. It took 3.5 weeks to arrive in France (ordered 11/11/17).

Of course, these PCBs have the +3.3V voltage problem on the Analog LDO input, and the MOSFET problem too :?
Image
Image

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RogerClark
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Re: F405 & F411 versions of the BluePill

Post by RogerClark » Thu Dec 07, 2017 11:39 pm

Very cool....

victor_pv
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Re: F405 & F411 versions of the BluePill

Post by victor_pv » Fri Dec 08, 2017 1:05 am

Nice. How is the latest revision coming along, did you settle on using a diode?
About the hand soldering versions, I compared them to the normal component for several components, and the pads extend more in the outside. I guess the purpose is so a thin soldering tip can touch the pad. I did replace one diode that blew up in a maple mini clone without an issue, and the pads most definitely were just normal size, and my iron tip is not pencil sharp either. Normally the diode terminals seems to always extend up the part (at least the few smd models I have hand soldered), so the soldering iron can touch and heat the terminal, and transfer heat from the there to the PCB pad.

If the intention is to make them easy to hand solder, I think using the hand solder version of the footprint would be a good idea, but if we are just making a few of them for prototyping until we are happy, and we all feel confortable with hand solder/skillet/reflow, then better use the real version of the pads that would would send to a factory, so no last minute mistakes because we replace a hand solder version for a normal solder version later on.

One more thing, why is the SY6280 in to +5V and out to VBUS? in that configuration, the board can power the USB, but the USB can't power the board. Did I miss something? Ok I see the SY6280 is not provided to power the board, but to power the USB port,controlled by PC9.

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RogerClark
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Re: F405 & F411 versions of the BluePill

Post by RogerClark » Fri Dec 08, 2017 1:46 am

Victor

The consensus was just to use a Schottky diode, so I was updating my copy of the files, but so far I've only had time to update the schematic, and I need to rename the schematic symbol to a SS12 as I didnt see a SS12 in the kicad diodes lib (but I will double check)
I've not looked at the PCB yet, but it should be OK as it replaces the 3 pads on the fet, with 2 pads

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Re: F405 & F411 versions of the BluePill

Post by victor_pv » 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.

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Re: F405 & F411 versions of the BluePill

Post by RogerClark » Fri Dec 08, 2017 3:18 am

A diode will do for these prototypes

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