topic Re: NFC PN7462 Harmonic Issue in NFC

NFC PN7462 Harmonic Issue

teinsu — Mon, 01 Oct 2018 08:50:35 GMT

We want to reducy harmonic,

and we change the GSN to 0x02 in CLIF_ANA_TX_AMPLITUDE_REG

We use NfcrdlibEx1_BasicDiscoveryLoop exmaple.

Change all about CLIF_ANA_TX_AMPLITUDE_REG inside user_EE.bin

from 0xFFFFxxxx to 0x02FFxxxx (there are 27 values)

Change CLIF_ANA_TX_AMPLITUDE_REG value

from 0xFFFFxxxx to 0x02FFxxxx before call phacDiscLoop_Run()

The CLIF_ANA_TX_AMPLITUDE_REG become 0xFFFFxxxx automatically, I can not found when the SDK access CLIF_ANA_TX_AMPLITUDE_REG from source code.

Does the CLIF_ANA_TX_AMPLITUDE_REG access inside the library?

How to reduce the Tx power?

Or any suggestion about hardware?

Re: NFC PN7462 Harmonic Issue

Kan_Li — Mon, 08 Oct 2018 06:45:45 GMT

Hi tein Su,

How did you generate the user_EE.bin? Did you follow the steps described in https://www.nxp.com/docs/en/user-guide/UM10948.pdf ? If yes, is it possible to send the "_output_xml_sizes.html" for a review?

Thanks for your patience!

Have a great day,
Kan

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Re: NFC PN7462 Harmonic Issue

teinsu — Mon, 08 Oct 2018 08:14:51 GMT

I will try to ask the customer to provide "_output_xml_sizes.html" file

and do you have any idea can solve harmonic issue?

thanks!

Tein

Re: NFC PN7462 Harmonic Issue

Kan_Li — Tue, 09 Oct 2018 03:00:35 GMT

Hi Tein,

From my understanding, this issue is related with the EMC design, and we have a training for that topic , you may refer to NFC Antenna Design 6: EMC related Design|NXP for details.

Hope that helps,

Have a great day,
Kan