RFID Tag reader

[Ricko]

Hi,

do you have any IC that can read either one of the three tags linked below?

Two of them are one frequency and the third of another frequency, we can stick to using just one frequency, 13.56MHz might be the better one.

If not, do you make any tags as small as those for which you can also provide a reader IC?

LXMS33HCNG-134-datasheet (murata.com)

LXMS33HCNK-171-datasheet (murata.com)

LXMSJZNCMD-217-datasheet (murata.com)

Thank you

[Ulysses HERNIOSUS]

Hi Ricko,

I think one of your links was incorrect: 

LXMS33HCNK-171-datasheet (murata.com) 

The HF chips can be read with any reader of our ST25R reader family. Due to the small antenna of these modules the read range will likely be limited to few millimeters and maybe you want to design a reader antenna fitting these tags.

BR, Ulysses

[Ricko]

Thank you @Ulysses HERNIOSUS 

this application is for scientific/lab equipment and we plan to have an array of antenna in a matrix of 8 x 8 on a A3-sized area and need to:

- limit the read range to maybe 5-8 mm (if possible)

- place the antennas as close as possible to each other but also limit the chances of cross talk

How can we achieve that?

One thing we are thinking about is reading the antennas in sequence.

Another is to use anticollision but from reading some articles it seems that 13.56 MHz RFID tags are not that good for that?

Any pointers/suggestions? Does ST provide any solution that can help.

Thank you

[Ulysses HERNIOSUS · Accepted solution]

Hi Ricko,

I think we don't have a solution which we can directly offer to you. 

I think crosstalk is hard to completely avoid. What you could also do is measure and identify the field/antenna where the tag is strongest. For this there is the RSSI indicator inside our chips and also exposed as rfalGetTransceiveRSSI() which you can call after successful frame exchange with a tag. So you cycle through your antennas one by one and after a full round you assess for the tags which have appeared multiple times on which field it was strongest.

Not sure I am getting your point about using anticollision as opposed to reading sequentially.... 

Regards, Ulysses

[Ricko]

Thank you @Ulysses HERNIOSUS 

the "anticollision" solution was a different one than using software to read them sequentially.

My understanding is that there are tags/systems like the UHF band (865-928 MHz - one of the links in my original post) that are very robust at reading multiple tags at the same time, much better than those at 13.56MHz. 

And the main point is that that is done all in hardware which would make time to market shorter and also a much more robust system.

Do you have readers ICs for those UHF tags that can do multiple tags reading?

Thank you

[Berenice BENVEGUDA]

Hello,

ST does not have anymore UHF readers in its portfolio.

Best Regards,

BB

[Ricko]

Thank you @Ulysses HERNIOSUS