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Topic: Small-footprint Due (Read 7292 times) previous topic - next topic

valerun

...got to stop adding pins...

added one more row on the 109-144 side of the chip which allowed a few additional digital pins but more importantly placing a 3.3v CAN tranceiver to be able to use an excellent CAN-DUE library by collins80 and a few others. These tranceivers run in our EV chargers and work like a charm. So now we have a fully plug-and-play CAN channel on board.

1.4"x1.4" board with 91 pins in 2 rows along the perimeter. The original idea was to have ~40 pins... lol

Sample chips arrived from ATMEL today.

Any other suggestions before we order the first ~10 boards for testing?

V
--
Val
http://www.eMotorWerks.com

gogol

That really sounds like a boost-board for the DUE-family. A fraction of the size of the original, with an estimated price, where you have not to think about letting the board in a project.

valerun

yes, that's the idea.

someone mentioned something about breaking out EBI data bus... What do you guys think about that? Better be very critical as I REALLY  don't want to add a third row of pins
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Val
http://www.eMotorWerks.com

valerun

just checked - full EBI bus is ~50 pins. so perhaps sometime in the future...
--
Val
http://www.eMotorWerks.com

ODwyerPW

Will you consider breaking out the Ethernet?
Quiero una vida simple en Mexico...nada mas.

valerun

#20
Apr 19, 2014, 09:40 am Last Edit: Apr 19, 2014, 10:32 am by valerun Reason: 1
would RMII be sufficient? 8 pins way better than 16...
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Val
http://www.eMotorWerks.com

Graynomad

You want to be careful about feature creep, I've done two Due-compatible designs now and in both cases they got too big and complicated so I ditched them.

OTOH it's a shame not to have all the SAM features :)

______
Rob
Rob Gray aka the GRAYnomad www.robgray.com

valerun


You want to be careful about feature creep, I've done two Due-compatible designs now and in both cases they got too big and complicated so I ditched them.

OTOH it's a shame not to have all the SAM features :)

______
Rob


so true...
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Val
http://www.eMotorWerks.com

valerun

ok RMII is in. Same board size (just reduced number of ground pins in the corners. Sending to PCB house today
--
Val
http://www.eMotorWerks.com

valerun

sample boards ordered. 4 sets of:
1. 2x MicroDue V1.1
2. 2x WiFly shield (same 1.4x1.4" footprint)
3. 2x u144 LCD shield (same footprint)
4. 1x MicroDue 'motherboard' in Arduino UNO R3 layout - with USB jack, power input, SPI breakout, second CAN tranceiver (in addition to the first tranceiver that is on MicroDue already)

They arrive next Fri. I plan to populate using our T962A over that weekend and start testing.

Who wants some test boards?

Val.
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Val
http://www.eMotorWerks.com

Palliser

Hi Val.  A very good initiative. I would like to get involve in the testing of your boards, specially with the EMAC and CAN peripherals.
Regards!

p

vanduino

My list:

USB Host on native USB port while externally powered (12V Vin).

Persistent RTC with breakout for backup battery.

3mm+ mounting holes in corners.

valerun


My list:

USB Host on native USB port while externally powered (12V Vin).

Persistent RTC with breakout for backup battery.

3mm+ mounting holes in corners.


thx. the only thing we don't yet have from your list are mounting holes. These would increase the size of the board by 30% (or result in the loss of ~10 pins) which is pretty significant. We are designing this board to be a pluggable MCU board for small production runs - similar to how Arduino Pro Mini or Spark.io boards are used...

But pls let me know if you have some creative ideas.

thanks,
Valery
--
Val
http://www.eMotorWerks.com

gogol

In a kickstarter project the same discussion ended with that solution:

https://www.kickstarter.com/projects/214379695/micro-python-python-for-microcontrollers/posts/727834

Paul Stoffregen


A fraction of the size of the original, with an estimated price, where you have not to think about letting the board in a project.


As someone who makes ARM-based Arduino compatible boards (but not with Atmel SAM3), I'm curious what price point you'd consider low enough to just leave the board in a project?

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