F405 & F411 versions of the BluePill

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Squonk42
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Re: F405 & F411 versions of the BluePill

Post by Squonk42 » Sun Feb 11, 2018 10:02 pm

OK, good idea, I will add a load, I just have to figure out where did I put my TH resistors, not using these much these days :D

I don't know for the AP2112, but a fake is a possibility, I bought them from AliExpress...

victor_pv
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Re: F405 & F411 versions of the BluePill

Post by victor_pv » Sun Feb 11, 2018 10:05 pm

Squonk42 wrote:
Sun Feb 11, 2018 3:43 pm
If you can get some extra of these in the same shipping from Mouser/DK (at least the ones I am missing or having in QTY < 5), please drop them in an envelope and send them to me by USPS, I will refund you via PP if you don't mind.

I have 10x NX3225GD (Y2), 20x SY6280 (U4) and 50x micro USB connectors (J5) that perfectly fit into the footprint (yeah!), so if you need some, pelase let me know!
Send me a private with the quantities you want of each part and I'll add to my order.

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ahull
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Re: F405 & F411 versions of the BluePill

Post by ahull » Sun Feb 11, 2018 10:09 pm

Some of other possibilities in order of likely hood.

1) The GND pin on the regulator is floating (caused by a bad or missing track, via etc)
2) The regulator is in back to front and we are getting a diode drop or something rather than regulation.
3) There is a path to 5V via a diode (or some other semiconductor junction(s)) from the output of the regulator.
- Andy Hull -

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Squonk42
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Re: F405 & F411 versions of the BluePill

Post by Squonk42 » Mon Feb 12, 2018 5:38 am

ahull wrote:
Sun Feb 11, 2018 10:09 pm
Some of other possibilities in order of likely hood.

1) The GND pin on the regulator is floating (caused by a bad or missing track, via etc)
2) The regulator is in back to front and we are getting a diode drop or something rather than regulation.
3) There is a path to 5V via a diode (or some other semiconductor junction(s)) from the output of the regulator.
There is what is supposed to be (you never know with Aliexpress...) a ferrite bead between GND and AGND, I will check it for 1)

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Squonk42
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Re: F405 & F411 versions of the BluePill

Post by Squonk42 » Mon Feb 12, 2018 9:21 pm

Squonk42 wrote:
Mon Feb 12, 2018 5:38 am
ahull wrote:
Sun Feb 11, 2018 10:09 pm
Some of other possibilities in order of likely hood.

1) The GND pin on the regulator is floating (caused by a bad or missing track, via etc)
2) The regulator is in back to front and we are getting a diode drop or something rather than regulation.
3) There is a path to 5V via a diode (or some other semiconductor junction(s)) from the output of the regulator.
There is what is supposed to be (you never know with Aliexpress...) a ferrite bead between GND and AGND, I will check it for 1)
OK, it is a ferrite bead indeed, but the solder joint was bad :? : I got a steady +3.30V on digital 3V3 and +3.29V on 3V3A, yeah!

Next step: add the tactile switches for USER/BOOT0 and RESET with all related parts, pull-down on BOOT1, decoupling capacitor on SWD and a single LED on PC13 as I don't have yet an 1616 RGB LED, all of these are low-risk, but easier to test without the STM32F405 installed.

Then mount the USB power Switch U4 (SY6280) and check if it controls VBUS by toggling its VBUS_EN input and check if the VBUS=>+5V Schottky diode is also working as expected.

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RogerClark
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Re: F405 & F411 versions of the BluePill

Post by RogerClark » Mon Feb 12, 2018 9:49 pm

Nice catch Andy.... even though you don't have the PCB ;-)

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Squonk42
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Re: F405 & F411 versions of the BluePill

Post by Squonk42 » Tue Feb 13, 2018 9:52 am

RogerClark wrote:
Mon Feb 12, 2018 9:49 pm
Nice catch Andy.... even though you don't have the PCB ;-)
?!?

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RogerClark
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Re: F405 & F411 versions of the BluePill

Post by RogerClark » Tue Feb 13, 2018 10:53 am

My misunderstanding

I thought the problem was related to one of the things Andy suggested.

racemaniac
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Re: F405 & F411 versions of the BluePill

Post by racemaniac » Tue Feb 13, 2018 10:55 am

RogerClark wrote:
Tue Feb 13, 2018 10:53 am
My misunderstanding

I thought the problem was related to one of the things Andy suggested.
Wasn't andy right? due to the badly soldered ferrite bead, the GND was indeed floating causing the issue :)
but of course also good catch of squonk to spot his bad soldering ^^

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ahull
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Re: F405 & F411 versions of the BluePill

Post by ahull » Tue Feb 13, 2018 11:01 am

I'll take the glory, even if it isn't deserved.

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