Alternative chip for ST25R3911B?

DIvan.1 · ‎2021-09-13

Hello,

Till now I was using ST25R3911B NFC chip for read/write (ISO15693).

Unfortunately ship have long lead time.

Can you please advice me which chip to use as alternative to have less changes on the PCB as possible?? (ST25R3912, ST25R3915, ST25R3917,... ??)

Thank you,

Domen

DIvan.1 · ‎2021-10-06

Perfect. The TRIM1 and TRIM2 (red mark in the picture below) line should just delete in antenna matching scheme or not?

Ulysses HERNIOSUS · ‎2021-10-06

Yes, you can also refer to 1.2.20 in DS.

For an existing matching with trim caps you probably want to compensate the middle value of your trim caps by changing the matching.

Regards, Ulysses

DIvan.1 · ‎2021-10-06

So your advice is left this Red crosses capacitors and lines?

But in datasheet of ST25R3915 is shown that the TRIM pins should be Not Connected.

Best regards.

Ulysses HERNIOSUS · ‎2021-10-06

Sorry to not have been clear: I would remove them and follow the DS. There can no good come from them and in worst case there would come harm.

regards, Ulysses