Hello :)
Does anyone know what the impedance of the existing antenna matching circuit on the X-NUCLEO-NFC06A1 board is? I can't seem to find that information in any of the datasheets. I need the impedance so that I can design a new custom antenna.
Br. Jørgen
Hello Jørgen,
The X-NUCLEO-NFC06A1 features AAT. AAT can change the matching impedance in a certain perimeter dynamically. AN5322 provides additional information about the AAT feature.
By setting the register 26h and 27h the matching can be changed from minimum to maximum.
Reg. 26h= 0x00; 27h = 0x00: (minimum)
Reg. 26h= 0x82; 27h = 0x82: (nominal)
Reg. 26h= 0x82; 27h = 0x82: (maximum)
By default the nominal matching is applied.
For acting only as a NFC reader AAT can be removed and a fixed matching applied.
BR Travis
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