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LF RFID Reader

Hussain Hakak
Prodigy 30 points
Other Parts Discussed in Thread: TMS3705

I'm looking at the TRPGR30TGC to use as a tag for my application. I need to be able to read 1 or 2 tags at a time, and have that information sent to a microcontroller, which then logs the id along with a few other variables from other sensors.

What reader could I use? And what antenna to go along with it?

  • 0
    TI__Mastermind 28485 points

    Hey Hussain,

    I would probably check out the TMS3705.  It is a LF Reader IC that supports 134.2 kHz and ISO 11785 that the tag you selected uses. 

    I don't have a list of antennas to go along with it but from some of the guides on the product page it seems it that it it can be used with a wide range of LF antenna's.  I'll try and ask around about it though.

    Thanks,

    JD

  • 0 in reply to JD Crutchfield
    TI__Mastermind 28485 points

    Hey Hussain,

    I also wanted to point you to our MRD2EVM.  You can use this EVM to read the LF tags. 

    Thanks,

    JD 

  • 0 in reply to JD Crutchfield
    Prodigy 30 points

    Thanks for the reply JD. I guess I was mainly just confused regarding the differences between the readers, and if just the reader was enough, or if you need a RFM with the reader?

    I'll do some more research when I get the chance.

    Thanks again.

  • 0 in reply to Hussain Hakak
    TI__Mastermind 28485 points

    Hey Hussain,

    You basically just need the reader of the RFM.  I'll give you a short breakdown below. 

    The TMS3705 is a micro reader chip that needs just a few external parts, and antenna, and a micro (see schematic below).  This reader is nice and cheap but all the communication protocol has to be handled on the micro.  This can be quite tedious and time consuming.   

     

    The MRD2 is basically a drop in ready solution.  It already handles all the software/procotal for you and can literally just dump the data over via UART/USB.  We'll call this the medium priced option.   

    The biggest differences between the above 2 solutions and a RFM, is the power and cost.  The RFM's are much more powerful, which means you can get much better range.  They usually come in more of a RFM Module, then you also need a control module and an Antenna.  This is usually the expensive solution, but if you need the range this is your best option. 

    I've attached 2 docs in the zip folder that show some range data for your reference, just to give you some idea of the difference between the uReaders and the RFM. 

    Thanks,

    JD

     

     

     

    LF.zip
  • 0 in reply to JD Crutchfield
    Prodigy 30 points

    Thank you, that makes it very clear for me. The only other question I would have is can it read multiple tags at once?

  • 0 in reply to Hussain Hakak
    TI__Mastermind 28485 points

    Hey Hussain,

    Please take a look at this post.  I wanted to clarify about how to get the ID from these particular tags through Charge Only Reading: http://e2e.ti.com/support/low_power_rf/f/667/p/246697/864093.aspx#864093 

     

    Unfortunantly, with these tags there isn't a way to read multiple tags at once.  Since once they are done charging they are just goiing to just spit back their ID's, they are going to overlap with each other.  

    The tag with the strongest signal is going to be read, as long as there is atleast 6 dB difference from it and the other tags signal power.  If there is less than 6 DB difference, then the tags will interfere and nothing will be recieved.

    Is reading 2 tags at once a requirement for your application or can you work with one tag at a time?

    Thanks,

    JD