About ST25R3916 typical schematic and BOM

[DSai.1]

We are developing RFID reader with ST25R3916. As design reference and parts selection, I wonder if we can get the schematic and BOM of ST25R3916-EMVCO.

best regards

Dai Sai

[DSai.1]

Dear Sir,

I found a datasheet about X-NUCLEO-NFC06A1, there is a schematic diagrams about the HW. I think it may be a good reference for my design. But in the diagrams on Page 3, I can not understand AAT series and AAT parallel. Could you give me any hits about them?​

[Peter BENSCH]

You will find additional hints regarding AAT (Automatic Antenna Tuning) in the data sheet of the reader chip ST25R3916.

AAT_series and AAT_parallel are controlled by two control signals AAT_A and AAT_B from the ST25R3916 and each change voltage-controlled variable capacitors (varicaps) LXRW0YV600-054. These varicaps have a control input at pin 2 whose voltage sets the capacitance of the capacitor between pin 3 and pin 4.

The Automatic Antenna Tuning now works in such a way that the signal

• AAT_series (AAT_A) changes the series capacitance and
• AAT_parallel (AAT_B) the parallel capacitance of the NFC resonant circuit,

which allows the resonant frequency of the resonant circuit to be adjusted and optimized.

Does it answer your question?

Regards

/Peter

[DSai.1]

Dear Peter,

thank you very much for your advice. I do understand what you said.

best regards

Dai

[Peter BENSCH]

Great!

If the problem is resolved, please mark this topic as answered by selecting Select as best. This will help other users find that answer faster.

Good luck!

/Peter