How to use ST25R3916B Single Ended

[smithderek2000]

Hello, I have one ST25R3916B which is connected to 16 PCB spiral antennas, through DPST relays. It works well. To select the antenna I want to use I just power that relay and leave the other relays off. However, the sound of the relays clicking is not advantageous. So I'm looking at antenna MUX ICs from Skywors, pSemi, etc. (example PE42582) but these are all 8:1, so I would need to use one on each RF output of the ST25R3916B.

Questions:

What do I modify in the driver code to support single ended operation?

In the driver code, how do I switch on the fly between the two single-ended outputs?

How do I change the antenna match to support single ended operation? I'm using the AAT with variable capacitors from the NFC08 reference design.

[Ulysses HERNIOSUS · Accepted solution]

Hi,

you may look around on this community and you should find some information based on ST25R3911B:

https://community.st.com/s/question/0D50X00009bLV0iSAG/st25r3911b-with-two-antenna-in-single-ended-mode

For 3916 the same principles are applying, let your upper layers switch the 'single' bit and the 'rfo2' bit as needed. I would do this with field disabled and subsequently restart the polling, etc.

BR, Ulysses