ST25RU3993-EVAL board. Autotuning feature

[Franco Bocalon]

The autotuning algorithm implemented in the app reader, is an external routine? I mean, the IC ST25RU3993 by itself can not tune an antenna. I guess that we need to implement some algorithm making a sweep and checking the reflected power, and then finally set the 3 values for the tunning capacitors.

[Nick K]

Hello, yes correct. The carrier cancelation circuite​ is a external HW component that is controlled by an MCU (The same MCU that controlls also the ST25RU3993). As an example how this could look like in HW and how it is used in FW please have a look into the EVAL board schematic and the EVAL board FW. Both could be found on www.st.com

Best Regards

[Franco Bocalon]

Dear Nick, Hi. I understand. But I mean that the search algorithms (OneHillClimb, MultiHillClimb, DuplicatedFastHillClimb, and EnhancedMultiHillClimb) I guess that the Appreader app implements them. I could not see this algorithms into the fw side.

Regards

[Nick K]

​Hi, the tuning algorithms are all completly implemented in the FW, the "Reader Suite" application simple call them in the FW. You find all the necessary implementation in the file "tuner.c". The 4 algorithms are implemented in the following functions "tunerOneHillClimb" -> FAST, "tunerDuplicatedOneHillClimb" -> VERYFAST, "tunerMultiHillClimb" -> SLOW and "tunerEnhancedMultiHillClimb" -> MEDIUM.

Hope this answers  your question, if you have further questions let me know.

BR Nick

[Franco Bocalon]

Dear Nick,

I am sorry. I could find them before.

Thank you so much.

Best Regards

Franco