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ERRAOUI Abdelhakim
ERRAOUI Abdelhakim
Associate II
November 16, 2020
Solved

FCC/CE pre-compliance testings for ST25R3916 custom board

  • November 16, 2020
  • 1 reply
  • 1534 views

Hi,

I'm making a new prototype based on the design/layout of the NFC06A1 evboard with minimal differences as for example : I don't use the capacitive electrodes in my design for wake up feature (but I put test points to CSI and CSO pins).

And I want to get through CE/FCC certification, but before I have to do some pre-compliance testings for the device. Therefore I have some questions regarding the NFC part.

1- The NFC06A1 design (st's) is already NFC compliant and has FCC & CE certifications I guess. Do we need to redo any testings for this part of my final product ?

2- How can I access to (RF) test mode in the ST25R36 if I need it? I just saw in the datasheet test access but I cannot figure out how to do that?

3- What are the important points that we should verify in pre-testing process?

Please see the schematic capture below (any observations ?):

0693W000005BWVSQA4.png 

Thanks in advance,

This topic has been closed for replies.
Best answer by Travis Palmer

Hello ERRAOUI,

removing the capacitive patches should not influence the EMI behavior.

Regarding your questions:

1.) Yes, even if you change components related to the matching network , antenna or clock generation on your already certified design, you have to re-certify. These rules are rather strict. The best is, if you search for accredited lab to support you here.

2.) What do you mean with RF test mode. I don't think that you want to look at the internal receiver signals.

3.) Important is that VDD is stable during continuous carrier and does not drop too much (~ -0.3V). You should also have a look at the regulator dropout (voltage difference between VDD And VDD_RF). If you want to be compliant to ISO, NFC-Forum or EMVCo you should do a pre-certification test before FCC.

Please let me know, if you have additional questions.

br Travis

1 reply

Travis Palmer
Travis PalmerBest answer
ST Employee
December 1, 2020

Hello ERRAOUI,

removing the capacitive patches should not influence the EMI behavior.

Regarding your questions:

1.) Yes, even if you change components related to the matching network , antenna or clock generation on your already certified design, you have to re-certify. These rules are rather strict. The best is, if you search for accredited lab to support you here.

2.) What do you mean with RF test mode. I don't think that you want to look at the internal receiver signals.

3.) Important is that VDD is stable during continuous carrier and does not drop too much (~ -0.3V). You should also have a look at the regulator dropout (voltage difference between VDD And VDD_RF). If you want to be compliant to ISO, NFC-Forum or EMVCo you should do a pre-certification test before FCC.

Please let me know, if you have additional questions.

br Travis

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