How to Read/Write ST25TA02K-PC6H5 NFC

[muthu kural]

Posted on September 21, 2017 at 16:40

Hello,

I am working on Project which have ST25TA02K-PC6H5 as a portion. I am seeing that interface between MCU and the NFC is the GPIO pin only.Neither have I2C nor SPI.  With the GPIO pin, How can I read/write the NFC registers? 

Have I selected wrong part?

Please suggest.

Thanks,

Muthu

[Thomas Q.]

Posted on September 22, 2017 at 14:54

Hello,

The GPO pin of the ST25TA02K-P is an output-only signal used to trigger RF events

(see section 2.4 and section 11 of the

http://www.st.com/content/ccc/resource/technical/document/datasheet/f9/9f/ef/57/ef/20/48/d0/DM00179249.pdf/files/DM00179249.pdf/jcr:content/translations/en.DM00179249.pdf

).

In the diagram you are showing, a typical use-case would be to send a wakeup signal

from the ST25TA02K-P to the microcontroller on a user-defined RF event.

The GPO interface can not be used to transmit NDEF content.

I suggest you have a look at the

http://www.st.com/en/nfc/m24sr-series-dynamic-nfc-tags.html?querycriteria=productId=SS1812

 product, which is a NFC Type 4A tag providing

a I2C interface that can be used to access the EEPROM.

Best regards