PN7462 HSU as a Conventional UART

[s_ali]

Hi

We are evaluating PN7462 (actually prototyping) for a battery powered reader application. We need PN7462 to do the all NFC related work and then pass on some application level data to another host processor over a Serial UART interface. I am a bit confused if the HSU on PN7462 is meant for some proprietary protocol and/or data only? Could it be used as any generic UART interface - we need to be able to send custom data using custom protocol.

The same goes for the I2C. There maybe a requirement later on to use PN7462 I2C as slave for custom data communication with an external MCU. I understand that only one of the I2C, SPI, UART can be used at a time.

Thanks

[Kan_Li]

Hi Shoaib,

The HSU port is a slave only port, so it can not be used as a generic UART, so for your case, I would recommend using Host interface as I2C slave and the I2C master connected with a bridge device like Bridges | Protocol Bridge | Bridge IC Solutions | NXP .

Have a great day,
Kan

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[s_ali]

Hi Kan,

Thanks for your reponse. I am little confused - when I look into section 9 of the document UM11083.pdf (OM27462NBR Smart Lock KITUser manual ), it seems to indicate implementation of a custom protocol over PN7462 UART. Please see snippet below:

and then subsequently in section 10 of the same document:

Does it not seem to indicate custom protocol over UART?

Regards

Shoaib

[Kan_Li]

Hi Shoaib,

I am sorry, I misunderstood you wanted to use HSU as master, and if that is the use case you want to implement, you can use HSU like that, but the I2C slave port and HSU port share the same interface, so you can not use them in the same time.

This custom protocol is from the application code, not embedded in the UART module.

Have a great day,
Kan

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[s_ali]

Hi Kan,

No problem and thanks for prompt response.

Just for clarification please - Is it correct that either of SPI/I2C/UART can be used as generic respective interface? Likewise, SPI/I2C can be used as Master or Slave generic interface?

Thanks

[Kan_Li · Accepted solution]

hi Shaoib,

Yes, you are right. Please also note SPI/I2C master interface doesn't share the same pins for slave interface. 

Have a great day,
Kan

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[amarsoma05]

if possible please provide the sample code for pne7462c nfc reader interface of ( uart / i2c / spi )