Compute Module Test Board

[mahjongg]

BTW: The 64kbit filesize limit in this forum is terrible....

its not quite as bad as you think! What you see is a thumbnail of it, right click on the picture, and open the picture in a new screen/tab and you will see it in its normal form.

If you want it full size, embed the picture, and put size tags around it (using the "Normal" pulldown menu) and use "huge".

[Briarios]

Hey guys,

I thought i would post a quick update, I have finally completed the schematic for the second version of the CM Test Board Complete with new Power management (Taken part for part from the CMIO board) I am still in the process of designing the board layout but none the less an update is to be done

so without further delay here is the link

http://pmfg.me/rpi/CM_Test_Board_2.x/CM ... .1_sch.pdf

Enjoy

[Springy]

Good to see more progress, looking forward to seeing the results!

[Cancelor]

Had you thought of selling the 'old' boards? Could they be hacked into submission?

[Briarios]

Had you thought of selling the 'old' boards? Could they be hacked into submission?

at this stage they will be regulated to being spare parts for when I get around to stripping them down also I do not believe it can be hacked into working

[Briarios]

Hey Guys,

thought I would post an update as I have completed the board layout, unfortunately i had to remove the usb boot option at this stage as it was becoming a real pain in trying to do USB without using Vias so in its place i added the TV DAC so i can see on what the heck is going on when it boots up

so without further ado here is the updated ones

Schematic http://pmfg.me/rpi/CM_Test_Board_2.x/CM ... 02.1.1.pdf
Front Side http://pmfg.me/rpi/CM_Test_Board_2.x/CM ... 02.1.1.pdf
Rear Side http://pmfg.me/rpi/CM_Test_Board_2.x/CM ... 1-back.pdf

[Briarios]

Hey guys,

I thought i would post an update to let you know that i haven't forgotten about this project and just to inform you that I have finally finished the second version, and to let you know that i am in talks with the same chinese fab house as I had used before, and will be submitting my design and BOM to them in the next couple of days. I don't think i will hear from them for at least 7 days due to National Holiday week they have this week.

So keep and eye out for more posts from me and again any suggestions are welcome

[Briarios]

Hey Guys,

Another update to keep you in the loop i have submitted my designs to the fab house this week so i am waiting on a quote for 2 test boards this time. As everyone has mentioned elsewhere in the forums the use of the PAM2306AYPKE has been on back order with all suppliers that the fab house uses and i had a look on mouser and they have a back order until something like Jan or Feb of 2015 which is a long time, so i have used the PAM2306AYPAA and while it is the same pin out as the other one, some extra parts are needed to pump the right voltage out.

Anyway please see the links below for the updated designs and I hope you still enjoy seeing them

http://pmfg.me/rpi/CM_Test_Board_2.x/CM ... .2-sch.pdf
http://pmfg.me/rpi/CM_Test_Board_2.x/CM ... 02.2-f.pdf
http://pmfg.me/rpi/CM_Test_Board_2.x/CM ... .2-bck.pdf

[Kozuch]

Very interesting work! Somebody should really bring an alternative IO board for the Compute Module to market. I did not read the whole thread, do you plan releasing the schematics for public use so that in case of demand these can be freely manufactured by someone?

I would be interested in a custom IO board with connectors for 2 cameras.

[Briarios]

Very interesting work! Somebody should really bring an alternative IO board for the Compute Module to market. I did not read the whole thread, do you plan releasing the schematics for public use so that in case of demand these can be freely manufactured by someone?

I would be interested in a custom IO board with connectors for 2 cameras.

Hi Kozuch,
Once i know the schematics i have designed will work I will release them for people to modify at will.

[mitchellch]

Any chance you would be willing to publish the Eagle files?

[Briarios]

Any chance you would be willing to publish the Eagle files?

Yes of course I will be releasing the eagle files once i can confirm it works no point in giving something out if it doesn't work or at least until you have tried to make it work hehe

[Briarios]

Hey guys, just to give you an update, I should receive my second set of test boards from the fab house probably at the end of next week and then its on to testing

[Applicable_Robotics]

Hello Briarios,
Have you made any progress on the testing of the latest batch of boards?
I am considering building a few CM BoB's for a project, and it would be quite helpful to have something to build from.
On a related note, how have you managed to create matched resistance routed pairs in eagle?
Thanks,
Nicholas

[Vizual54]

Great work!

I too would love to see a custom io board with two csi ports and a ethernet port.

[Briarios]

Hello Briarios,
Have you made any progress on the testing of the latest batch of boards?
I am considering building a few CM BoB's for a project, and it would be quite helpful to have something to build from.
On a related note, how have you managed to create matched resistance routed pairs in eagle?
Thanks,
Nicholas

Hi Nicholas and guys

The latest batch are on their way from Shenzhen at the moment so i won't be able to test them until the middle of next week unfortunately.

To answer your second question and for anyone who wishes to know, I used a program called Saturn PCB to workout what width the traces needed to be and also how far apart the traces needed to be from each other. Then I did a rough outline in eagle on where the traces needed to go, then once I made sure the gap between the traces were uniform, I clicked on the meander button in eagle to determine the length of each trace and then I extended or shortend one of the traces so that they both line up roughly to within a 5% threshold I had set. this is to ensure that both traces conform to the correct ohm values for each of the pairs.

Also note that while it is doable I strongly recomend not using a 2 layer PCB for this, for curcuits that use Ethernet or USB you need a 4 layer PCB or greater to achieve the results needed and to conform to the USB and Ethernet standards.

[Briarios]

Hey guys,
I thought i would post a quick update, I have recieved the boards yesterday and did a quick test and can confirm that the voltages are correct at 3v3,2v5 and 1v8 they are not fluctuating unlike my first batch which didn't use the pam2306AYPAA chip, I am waiting on a few parts to do further testing with so once i receive them, then i should be able to continue further with the testing

[esquerbatua]

Hi, sorry if it's very late, but you can share the .brd and .sch?

[Briarios]

Ok so I started to do some testing last night as some of the parts I ordered have finally come in. It wasn't booting at all which was quite strange, then I found that there are a couple of diodes in the wrong way so I will have to desolder them and fix that up which will be tonights job

[esquerbatua]

I was found an website that build pcb at very good prices.
Is this: http://www.pcbway.es/
if you are interested xD

[Applicable_Robotics]

Hi Briarios,
How is the testing coming?
Could you release your current Eagle files even if they are not fully tested?
Also, what Eagle library are you using for the SODIMM connector pinout?
This project has been quite helpful for the timely execution of mine.
Thanks,
Nic

[Briarios]

Hi everyone,

Just to give a quick update, i am still testing the board out as the diodes are being a pain to solder on, as the pads are so small. I hope to provide more information soon as work is a little quiet at the moment while everyone is on holiday

also sorry for lack of updates i've had to wait for free time to continue with the project.

[hasseb]

Hey all,

I have a similar project for CM and LAN9512. You can download the schematics from here. The board has been tested and working.

BR,
Hans Baumgarter
http://store.hasseb.fi

[claudioalmeiida]

Hi Hasseb, You can release eagle files? thanks...

[Briarios]

well after several weeks of getting my test board to try and boot I finally was able to get it to boot up , will post pics soon. I can confirm that the test board can see the 9512 usb chip so i will now check if usb and Ethernet will work