Search found 184 matches

by Squonk42
Mon Dec 11, 2017 10:35 am
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 471
Views: 7646

Re: F405 & F411 versions of the BluePill

I've tested DFU upload on one F4 board, and it seemed to work every time. I checked the board and it does not have a pulldown on PA9 or PA10 I also checked the STM32 Stamp schematic (there is a copy in my repo in the STM32F4Stamp folder) and that board does not have a pulldown on PA9 or PA10 (it ca...
by Squonk42
Mon Dec 11, 2017 6:08 am
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 471
Views: 7646

Re: F405 & F411 versions of the BluePill

Ok, thank you for your feedback! I will then implement solution #2 (not care about it) since 1) I think this situation is unlikely and can be fixed by a simple retry and 2) it is easier, since there is nothing to do! Uploading a board from a bin file on the sdcard would be great! I fixed all problem...
by Squonk42
Sun Dec 10, 2017 10:24 am
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 471
Views: 7646

Re: F405 & F411 versions of the BluePill

Looking at the AN2606, p. 97, section 25.1.2 , the STM32F40xxx/41xxx devices bootloader checks USARTx (USART1 and USART3, both on port B & C) and CANx (CAN2) for a specific character of frame before checking the USB cable to execute the DFU bootloader. This means that for reliable operation, the boo...
by Squonk42
Fri Dec 08, 2017 10:33 pm
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 471
Views: 7646

Re: F405 & F411 versions of the BluePill

I also changed the power for the AP2112 analog supply LDO from +3.3V to +5V and made VBAT trace thinner. And I am pretty confident that if I replace the 32kHz crystal by a smaller FC-12M package as suggested by @racemaniac, I will be able to fit the ferrite bead between GND and AGND, which should co...
by Squonk42
Fri Dec 08, 2017 10:09 pm
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 471
Views: 7646

Re: F405 & F411 versions of the BluePill

I am using a smaller 1N5819HW (SOD123 package, 3.85 x 1.70 mm including pins), NOT an SS12 with an SMA. package, which is indeed 5.28 x 2.54 mm. 1N5819HW is also a 1A Shottky diode able to withstand the required power and is easy to find on Aliexpress: https://www.diodes.com/assets/Datasheets/ds3021...
by Squonk42
Fri Dec 08, 2017 9:51 pm
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 471
Views: 7646

Re: F405 & F411 versions of the BluePill

I was able to fit an 1N5819HW (SOD123 package) by moving some components around like this (sorry I had only EagleCAD available, I will report it into KiCAD later):
1N5819HW.png
1N5819HW.png (119.29 KiB) Viewed 26 times
by Squonk42
Fri Dec 08, 2017 8:49 pm
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 471
Views: 7646

Re: F405 & F411 versions of the BluePill

I will try with the smaller 1N5819HW (3.85 x 1.70 mm including pins vs. 5.28 x 2.54 mm for the SS12). We must respect the component courtyards: for example it is forbidden to put components in the corner of the STM32 as some pick&place machine may grab the chip by the corners or use a suction cup on...
by Squonk42
Fri Dec 08, 2017 6:15 pm
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 471
Views: 7646

Re: F405 & F411 versions of the BluePill

I don't know if it is a good idea, since the thermal characteristics are already given when PCB mounted with 0.2" x 0.2" (5.0 mm x 5.0 mm) copper pad areas...
by Squonk42
Fri Dec 08, 2017 3:40 pm
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 471
Views: 7646

Re: F405 & F411 versions of the BluePill

This one is a true 1A 450mV AND 450mW in a slightly smaller (small enough?) package (3.85 x 1.70 mm including pins):
https://www.diodes.com/assets/Datasheets/ds30217.pdf
https://www.aliexpress.com/item/sku/32841683463.html
by Squonk42
Fri Dec 08, 2017 1:48 pm
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 471
Views: 7646

Re: F405 & F411 versions of the BluePill

how about this one: https://www.aliexpress.com/item/100PCS-B5819W-1N5819W-SOD-123-Marking-SL-schottky-barrier-diode-40V-1A-SMD-IN5819W-SOD123/32430925576.html?ws_ab_test=searchweb0_0,searchweb201602_2_10152_10151_10065_10344_10068_10345_10342_10343_51102_10340_10341_10541_10084_10083_10304_10307_10...