Increase HTRC110 Tag reading

[Felix0209]

I have successfully read HITAG S tags and read pages and blocks but it only works when the tag is on top of the coil and not at a distance > 1cm. I can see the tag affects the field at a greater distance but when I look at Dout on the HTRC110 it hasnt demodulated it. I am pretty sure the electrical side is correct as i copied a product that works. is there something that I need to tune in the config page that might help

product - https://docs.rs-online.com/73f6/0900766b81641265.pdf

[Fabian_R]

Hello, my name is Fabian, I've been assigned to support your case.

Thank you for your interest in our products

My apologies for the delay answering back.

I cannot assure you is the antenna design of the Reader is the optimal since the design was based on a different device. For a successful antenna design and tunning, I have to recommend to please take a look at our HTRC110 documentation:

https://www.nxp.com/docs/en/application-note/AN98080.pdf

I hope this information may have been useful.

[Felix0209]

I have gone throught the application notes and double checked my circuit is right and it is. I even tried slightly changing some of the resistor values but nothing changed. I can see on a scope the tag is sending data at a distance of about 5cm above and is visible at Rx but then when I scope Dout nothing is demodulated

[Fabian_R]

Hello sir, I understand.

Still, I will have to ask you to check the antenna Tunning using a Vector Analyzer. Unfortunately we don't have a specific document to perform this procedure in the HTRC, please take a look at our NFC devices. The procedure should be very similar. Please keep in mind that you will need to sweep the frequency around 125kHz.

Please take a look at the following documents: https://www.nxp.com/docs/en/application-note/AN11019.pdf

https://www.nxp.com/docs/en/application-note/AN12810.pdf

We are assuming you don't have any power-related issues since reading tags is successful but, it is worth to also check this for discarding a possible issue.