ST online NFC Tuning Circuit / Antenna Matching Tool

[stst9187]

Hello,

I am designing an NFC reader based on the ST25R95 transceiver and I would like to use the ST online NFC Tuning Circuit / Antenna Matching Tool to calculate the antenna matching network.

However, I cannot find the ST25R95 among the selectable ICs supported by the tool.

Is it possible to use the online tuning tool for the ST25R95 by selecting an equivalent device,?

If the ST25R95 is not supported, what is the recommended method for calculating and tuning the matching network? Should I rely only on application note AN5248 and the reference designs?

Any guidance from ST engineers or users who have successfully designed a matching network for the ST25R95 would be appreciated.

Thank you.

Marco

[Travis Palmer]

Hello Marco,

First I would like to highlight that the ST25R95 is in status NRND. 

It is an easy to use and robust device, but some features required for newer standards are missing (for example. AWS and DPO for NFC Forum CR15 OV20).

A few requirements are different from other, newer products. Therefore the design process is not covered by the AMT and NFC Tuning Circuit online tool.

Nevertheless the ST25R95 EMI filter calculation tool (STSW-ST25R003) and Application note 

ST25R95 transceiver antenna tuning circuit with EMI filter (AN5248) are still available on www.st.com.

Please let us know if you have any specific questions. 

BR Travis

[stst9187]

Hi Travis,

Thank you for your reply.

This isn't a new project it is a improvement of an exsiting project, I need to increase the wireless distance range.

Does ST recommend a replacement?

Best regards,
Marco

[stst9187]

Hi Travis,

Does ST's NFC Inductance web calculator work correctly?
It seems that I cannot modify the input values.

Best regards,
Marco

[Travis Palmer]

Hello Marco,

on top of the page you can find a hint:

maybe it was not there when you tried. 

After logging in, it is possible to overwrite the values:

BR Travis

[Travis Palmer]

Hello Marco,

It depends on your requirements. (Output power, feature set, cost)

If you describe your application, we can help you to choose the correct product. 

A rough overview can be found here:

https://www.st.com/en/nfc/st25-nfc-readers/products.html

Products by history:

There is the ST25R95 (earlier known as CR95HF) which you already know.

Afterwards the first AFE (Analog frontend) is the ST25R3911B family (3911B/12/14/15). It was able to pass the EMVCo standard (2.6b at this time) with this device with some fine-tuning. 

The ST25R3916 family (16/17/18) was the evolution of the 3911B featuring a new receiver (much better sensitivity and robustness) as well as some new features. It was the first AFE which easily passed the EMVCo (2.6b) standard.

Due to new requirements of EMVCo and NFC Forum the 3916 was upgraded to the 3916B (16B/17B/20B). Main difference was the added AWS which made the 3916B fit for EMVCo 3.x and any new NFC Forum standard.

The ST25R200 was added to the portfolio as a new entry level device, powerful enough to replace the R3911B family. Compared to the R3916B it has a bit reduced feature set. Features like AWS and ISO-HBR are missing. It targets IOT applications where a small footprint at high output power is required. 

The newest product is the R300/R500 family (including R210 and R501). It currently has the most advanced features such as new AWS, new receiver, new wake-up feature, new DPO. It is a safe choice when an easy design in is required, regardless of the required standard (EMVC, NFC Forum, ISO,...)

Another new product is the ST25RN300. It  is an NCI reader / NFC controller designed for integration into NFC‑compliant products. It is perfect when integrating into an Android environment. 

Please let us know, if you have further questions.

br Travis