I uploaded the preliminary schematic of STM32-E407 at http://www.olimex.com/dev/ARM/ST/STM-E407/STM32-E407_Rev_A.pdf
- 6-16VDC input power supply with DCDC
- 2 USB OTG (not High speed)
- SD card
- Ethernet 100MB
- JTAG, UEXT
- Button, LED
- Arduino platform (share some signals with FSMC external bus) so you can have either Arduino either external memory bus but not both at same time
the CAD files are uploaded on https://github.com/OLIMEX/STM32F4
siy
Member
By the way: have you considered any alternatives to KS8721 as Ethernet PHY? For example, LAN8720 looks more interesting, it has smaller package/pin count and may allow use clock output provided by MCU. And it's about 1/3 of the price of KS8721 in local stores (Mouser lists it for less than a $1 in quantities). Another question is about DCDC. Have you looked at ST1S10? It costs almost exactly the same money as MP1482 (might be even cheaper in large quantities), has same package (it also has DFN-8 version), smaller count of external components (no compensation circuitry), inductor has smaller value (3.3uH) and in addition to all these, it can source 3A instead of 2A.
mabl
Member
@siy
I think I read some issues with the PLL jitter impacting MAC drivers. So I guess you really need an ext. osc.
@olimexino
Looks nice! I like the SDIO instead of SPI for the SD Card. Also all connectors (and status LED) face one common side, even the uSD - great!
The U3BOOT header has RX,TX,GND but no VCC header. I think it would be helpful to have also VCC to power a level shifter.
@siy thanks for the LAN8720 suggestion, the reason we go with KS8721 is that this is proven IC we use in lot of our boards, jumping to new IC will just slow down the development as we do not stock it nor we have evaluated it if it will works as expected, the difference is not so big to consider the extra troubles
same for ST1S10 it may be nice chip but we try to re-use what we have in stock and use to the other boards to may consolidate our purchases and do not keep excessive part numbers in our inventory, I'm sure there may be other nice DCDC as well but we have stock of MP1482 and we already have to manage and logistic/deliveries of 3000+ different components, I can't add 5-10 new components for every new board nor to re-design 500+ boards we have which use these chips which we already use :)
MP1482 is very good DCDC we recently add it to our components stock for iMX233-OLinuXino and love it, in future we are probably going to redesign our GSM modules with it also as it performs better than RHOM part we use now.
@mabl - good point got the VCC we will add to the header
Hi Olimexino,
no i intend STM32 E407 . The standard libmaple don't support 407 are you working on it ?
So the other question is the iMX233 support linux , what revision ? On your site i see that there are also another board that use CortexA13 when will be available ?
Best
Roberto
for H407 I made few prototypes to give away to people who want to develop but we have to do some functional test code to test them before we send, so these will be mailed next week as we have few days off to celibrate the Labour day May 1st - isn't it great to celibrate LABOUR day by not working :)))
for E407 will be same - drop me e-mail with what you want to do with E407 and I may decide to send you one free of charge ;)
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