Looking for consultant to check boards for CE testing

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rv213

Joined: 07 Jun 2006
Posts: 7

10 Feb 2007 0:44 Looking for consultant to check boards for CE testing

I have designed two boards but don't know if they will withstand the testing needed for CE certification. My background is in Mechanical Engineering and I used example schematics from development boards provided by the IC manufacturers.

Need advice for improving the boards, particularly the connection between USB I/O bits and the other 5V board.

Any advice or contact information is greatly appreciated.
Roberto

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wizpic

Joined: 23 May 2004
Posts: 380
Helped: 26

10 Feb 2007 10:42 Looking for consultant to check boards for CE testing

Roberto
For CE marking it's not so much how the schematic is laid out, It's the PCB that has got to mee the requirements, I used to work for a company that sent some stuff away to be CE marked and for what i can remember is

If it has got mains transofoemer on PCB it has to be protected with fuse on the input side and has to has a 8-10mm clearance all the way around the tracks that the AC mains supply run accors no ohter low voltage track run in that area, if you use opto-isolators then it's best not to but any GND plane unneath them,

I'm sure if you do a search on here you should find some books about PCB design

so what you need to do is get your PCB layout then **** and see, but if you do not intend to sell these has a peoduct then it does not need to meet the CE markings but to be honest unless you are goinf to sell them in the millions then i would not bother has CE marking are not cheap if i remember it cost my old company upto 10K or more

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Iouri

Joined: 17 Aug 2005
Posts: 687
Helped: 79

13 Feb 2007 17:46 Looking for consultant to check boards for CE testing

1. I would suggest to add series resistors(22ohms) from cypress part to the connectors
2 diode in parallel with R6
3. protection didoe parallel to J5
4. look in the semtech.com for the protection devices for the USB port

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oddbudman

Joined: 20 Oct 2004
Posts: 91
Helped: 12

14 Feb 2007 1:51 Re: Looking for consultant to check boards for CE testing

You may also need a pull up resistor on the SCL line - can't seem to spot it.

rv213

Joined: 07 Jun 2006
Posts: 7

14 Feb 2007 17:11 Re: Looking for consultant to check boards for CE testing

Thank you for all the suggestions.

Iouri,

I have seen other examples that have put a resistor in series with I/O lines. What does that do? Does it simply lower the input voltage the Cypress pin would receive? Each pin has max input rating of 5.25V, so I didn't think it was necessary but I will take a closer look.

I have also looked at Semtech ESD protection arrays. Would you recommend using these on the Cypress I/O lines as well for ESD protection?

Thanks again for all the help.
Roberto