NFC中的主题 DPC questions

LPCD issue on NFC Cockpit v5.8.0

ChrisPark — Thu, 25 Mar 2021 05:34:20 GMT

Hi Everyone,

I am using NFC Cockpit v5.8.0 with PNEV7462C. I tried the LPCD function but it always reported "Card/Load detected in the field" even if there is no card/tag. I am not sure the reason. Any idea?

Thanks,
Chris

Re: LPCD issue on NFC Cockpit v5.8.0

Kan_Li — Thu, 25 Mar 2021 09:20:56 GMT

Hello @ChrisPark ,

The LPCD should only be used with disabled DPC. Did you disable DPC ? Please kindly refer to https://www.nxp.com/docs/en/application-note/AN11785.pdf for more details.

Have a great day,
Kan

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Re: LPCD issue on NFC Cockpit v5.8.0

ChrisPark — Thu, 25 Mar 2021 09:49:20 GMT

Hi Kan,

Thank you for your reply. I have disabled DPC by writing 0xF2 to DPC_CONTROL as below:

INFO:EEPROMService_PN7462AU:Write to EE address:0x201352. Value=0xF2
INFO:EEPROMService_PN7462AU:Read from EE address:0x201352. Value=0xF2

What did I miss yet?

Thanks,

Chris

DPC questions

ChrisPark — Tue, 30 Mar 2021 01:40:37 GMT

Hi @Kan_Li,

According to AN11742, it mentions a Rx resistor (e.g. on page 12). However, I cannot find the resistor on the board PNEV7462C. Could you please give me a hint?

Thaks,

Chris

Re: DPC questions

Kan_Li — Thu, 01 Apr 2021 08:09:54 GMT

Hi @ChrisPark ,

They are R2a and R7a, please kindly refer to UM10883 for more details.

Have a great day,
Kan