STM32F407ZGT6 – Acelex schematic ?

Hi

I am considering to take a closer look at the Acelex STM32F407ZGT6 black PCB – but have some challenges.
I tried to contact the seller on Aliexpress to get a schematic with more detaiuls than the one in poor resolution on the shop page – but only got an “Ok” response back from the seller
Would anyone by chance a version in PDF format or similar ? The image on the Aliexpress page (https://bit.ly/2FyWieF) is more or less useless…

I am not quite sure if the schematic is the same as this one: http://wiki.stm32duino.com/index.php?ti … _sch-1.pdf

Regards
Brian

Update: Think I might have found it: https://www.dropbox.com/s/fuevtkp0gqugk … hmetic.pdf

Is someone maybe able to verify – or give their opinion whether it matches the one on the aliexpress page ?

title bottom right says it’s a zet
sorry
edit something is telling me it has some zgt notations, – fsmc select? maybe a couple of places /edit
srp

ZET / ZGT – it is just a question of 512KB flash or 1024KB flash inside the chip…

apols, i was thinking of vet/zet board

couple of questions
how many pins on the display ?
is it male or female ? header pins or a socket ?
in the web page, did you scroll further down and see a compatible display listed

attached is schematic of 407zgt board, oh fun and games with size and extension failures

zip appears ok, 170k x 3 too large

I am curious why you are considering the STM32F407ZGT6 black over the cheaper more documented STM32407VET???

ZGT6 has a ‘minor’ advantage, you can quite easilly add an sram chip on FSMC e.g. 512k or 1m sram and i think for sdram much more than that
i’ve got a ZGT6 board with the sram pads but had not yet made the move to solder that, not too confident about soldering for some 42 smd pins ! i think
between E and G is 512k vs 1m, it is the V vs Z that makes a difference in the pin counts

note that in the dropbox link provided the mcu is given as VET6 not ZGT6, do provide the link to the original aliexpress ad as that makes the context more relevant. i’d think the boards are ‘quite similar’ except for FSMC as the V* series has much less address lines as related to FSMC
as for the gpios and pins i think they may well be printed on the silkscreen texts on the pcb itself knowing the PAXX would suffice to look up the specs to find the alternate functions e.g. SPI etc

incidentally as the Z* boards are priced above usd 10, it is running into the price breakeven against low cost ‘Rpi clones’
e.g. orange pi one usd $10 – 512M sdram – quad core A7 32 bits 1.2 ghz
https://www.aliexpress.com/wholesale?ca … nge+pi+one
http://www.orangepi.org/orangepione/
the only difference being that the ‘Rpi clones’ are ‘poor in IO’, but if the use case is just ram
the R-pi clones easily out perform the F407 by miles

A little more advanced but there is this also of you want insane performance and big RAM with lots of IO pins https://www.indiegogo.com/projects/sipe … =lifecycle#/

istr a samsung chip and an a n other brand, one ‘significantly slower in timings, both types are still somewhere in the physical heap of things to do – as well
for some reason stevestrong springs to mind ? there’s a thread on those chps on a ze or zg board somewhere
try a search
srp

[flyboy74 – Sat Nov 24, 2018 4:11 am] –
I am curious why you are considering the STM32F407ZGT6 black over the cheaper more documented STM32407VET???

ZGT6 has more I/O pins – very usefull for e.g. a 3D printer controller, when multiple extruders are needed. So far (on paper) I have managed to get pins mapped for 3 extruders on a VET6, but only a few extra I/O’s are then available for other purposes (once display pins etc has been mapped).

[bipsen – Sun Nov 25, 2018 7:53 am] –

[flyboy74 – Sat Nov 24, 2018 4:11 am] –
I am curious why you are considering the STM32F407ZGT6 black over the cheaper more documented STM32407VET???

ZGT6 has more I/O pins – very usefull for e.g. a 3D printer controller, when multiple extruders are needed. So far (on paper) I have managed to get pins mapped for 3 extruders on a VET6, but only a few extra I/O’s are then available for other purposes (once display pins etc has been mapped).

VET is a 100 pin package, how many pins do you use on each stepper motor. I usually only use 2 pins per stepper (dir and step) some people also use another pin for EN (only needed of you want to disable a motor)

I currently have a project with a 16bit screen (connected to FSMC) also the control pins for screen and with 4 touch pins to my ADC, a 8bit camera (connected to DCI) also using I2C to control it and also a number of other control pins fro the cmaera, UART for a serial terminal, other 2 pins for interrupts, SWD debugger and there is still pins left on my STM32F407VET black board. The only thing I could do with is more RAM because for doing graphics.

The plan was to use the same approach as Fysetc F6 – so that the board could support A4988, DRV8825, TMC2100/2130/2208 – and 2130 in SPI mode and 2208 in UART mode – just by using jumpers, and no cable mess. This will require 6 pins for each stepper driver.
Some pins are already used by components on the VET boards, and some considerations also need to be made regarding usage of certain pins, as they will be in an output state if the built-in bootloader is enabled.
It will probably be able to fit in a VET6 – but it doesn’t leave much room for potential aux ports..

[ag123 – Sat Nov 24, 2018 5:57 pm] –
…
the only difference being that the ‘Rpi clones’ are ‘poor in IO’, but if the use case is just ram
the R-pi clones easily out perform the F407 by miles

Just for FYI… https://www.raspberrypi.org/forums/view … 7&t=206747

Ray