MCU control the antenna function of ST25R3916

[ANaud.1]

Is there a way to have any MCU control the antenna function of the ST25R3916, if we use the ST25R3917, as there is a stock shortage of the 3916 ?

[Ulysses HERNIOSUS]

Hi ANaud.1,

I assume you are referring to AAT? AAT in ST25R3916 is implemented by two DACs providing a voltage to the control pins of variable capacitors.

You could do basically the same by using two other DACs (for example from your MCU if available). However there are some limitations with regards to power-down/wake-up mode - you may need to keep them active all the time or otherwise you may experience issues when using the inductive wake-up feature of St25R3916/7.

Best Regards, Ulysses

[TZhou.2]

Hi Ulysses,

As I know the ATT is an auto-tunning technology, but I'm not familiar with coding about this. Could you provide some tutorials about how to configure the ATT on NFC06A1 board?

Thanks,

Thomas

[Ulysses HERNIOSUS]

Hi Thomas,

please have a look at AN5322.

Best Regards, Ulysses

[TZhou.2]

Hi Ulysses,

Thanks for your reply. But I have also another question: how to measure the energy efficiency parameter on NFC06A1 board? If I test the VDD_RF pin is helpful? Thanks,

Thomas