2021-09-13 11:48 PM
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
Solved! Go to Solution.
2021-09-14 01:54 AM
Hi Domen,
the ST25R3911B, ST25R3914, ST25R915 are mostly the same (pinout and register interface). You can check them out (features and availability).
ST25R3916, 17, 18, 20 are a different family (changed pinout, different features, changed register interface). When using RFAL they can be used in the same way.
Best Regards, Ulrich
2021-09-14 01:54 AM
Hi Domen,
the ST25R3911B, ST25R3914, ST25R915 are mostly the same (pinout and register interface). You can check them out (features and availability).
ST25R3916, 17, 18, 20 are a different family (changed pinout, different features, changed register interface). When using RFAL they can be used in the same way.
Best Regards, Ulrich
2021-09-14 10:37 PM
Thank you for your advice, I think ST25R3915 would be the best.
In my situation, I have a big closet where have 30 precisely positioned items. On the back side of each item I will put NFC chip + antenna and microcontroller.
I noticed that ST25R3918 have also I2C communication... Is it possible to use only NFC chip without moicrocontroller and connected them via I2C to the master microcontroller?
All the best,
Domen
2021-09-14 11:29 PM
Hi Domen,
of course you can connect the ST25R3916/8 to any microcontroller using I2C. For your example there are a few caveats:
Best Regards, Ulysses
2021-09-15 02:47 AM
Thank you for caveats. I think It's not worth it. It will be better to use NFC chips and microcontrollers and then microcontrollers connect via I2C with master controller.
What do you think about the idea to have more antennas at one NFC chip? (if this is these even acceptable)
All the best,
Domen
2021-09-17 04:43 AM
Hello,
Can you please explain how to detect more than one Tag?
I'm using ST25R3911 and rfal library.
Best,
Domen
2021-09-17 05:02 AM
Hi Domen,
please have a look at how-do-i-read-multiple-nfc-tags-with-library-stswst25r016. All the information there holds also for ST25R3911B.
Regards, Ulysses
2021-09-17 05:05 AM
Hi Domen,
Both 3911 and 3916 devices can support two single-ended antennas: AN5592.
For more you would need to use external multiplexers. We don't have a lot experience with this.
Best Regards, Ulysses
2021-10-06 12:54 AM
Hello,
Can you suggest me or provide some document with electrical scheme of ST25R3915.
I need to develop standalone PCB.
Best regards,
Domen
2021-10-06 05:02 AM
Hi Domen,
ST25R3911B and ST25R3915 are pin-to-pin and software compatible (except for AAT). So you can just look at all the available information for ST25R3911B.
Basic electrical schemes can be found in 1.2 Application information of the datasheet.
Best Regards, Ulysses