topic Re: Ucode I2C matching to 50 ohm ? in NFC

Ucode I2C matching to 50 ohm ?

fletort — Fri, 18 Nov 2016 14:04:33 GMT

Hello,

i am really interesting by the Ucode I2C chip for tow reasons :

- BAP feature

- Interruption on Reader read operation.

But I am planning to use a 868Mhz ceramic chip already present on my board.

And, i don't know if a matching is available for this chip to match to 50ohm line ?

I found such a matching for another rfid chip from monza in one of their application note.

Is it possible with the ucode chip ?

Re: Ucode I2C matching to 50 ohm ?

Kan_Li — Fri, 25 Nov 2016 06:18:10 GMT

Hi Fabien,

I think you may refer to http://cache.nxp.com/documents/application_note/AN11180.pdf?fsrch=1&sr=4&pageNum=1 and http://cache.nxp.com/documents/application_note/AN11181.pdf?fsrch=1&sr=7&pageNum=1 for details.

Hope that helps,
Have a great day,
Kan

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Re: Ucode I2C matching to 50 ohm ?

fletort — Tue, 29 Nov 2016 21:54:49 GMT

thnaks i already read these documents. but no information are given for 50ohm matching.

Re: Ucode I2C matching to 50 ohm ?

Kan_Li — Wed, 30 Nov 2016 03:04:51 GMT

Hi Fabien,

Have you referred to http://www.nxp.com/documents/application_note/096917_UCODE_G2XM_G2XL_an.zip for details? Please note Ucode I2C impedance is 12.7-j199@915MHz, and this value should also be ok for 868MHz, but if you want to use 50ohm antenna , you have to use a 12.7+j199 to 50ohm Impedance transformation structure between the chip and antenna, for example , a Discrete L-Section Matching Network.

Hope that helps,
Have a great day,
Kan

Re: Ucode I2C matching to 50 ohm ?

Marcel_ArrowCE — Mon, 13 Jan 2025 13:30:05 GMT

Hi NXP Team,

the link http://www.nxp.com/documents/application_note/096917_UCODE_G2XM_G2XL_an.zip is not available.

Can you share the .brd file or the whole zip file with me? THX
Marcel

Re: Ucode I2C matching to 50 ohm ?

Shrfid — Tue, 11 Mar 2025 07:34:21 GMT

Hi NXP Team,

the link http://www.nxp.com/documents/application_note/096917_UCODE_G2XM_G2XL_an.zip is not available.

Can you share the .brd file or the whole zip file with me? THX