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Detection of location of a NFC transponder

Dominik And
Prodigy 10 points
Other Parts Discussed in Thread: TMS37126, TMS3705

Dear Forum,

is it possible with the TI NFC demonstrator kit (which uses TRF7970A ) to realize a functionality like  described here: http://www.ti.com/solution/car_access_system

Or is the 3D receiver TMS37126 a better choice for this?

The basic idea is to generate a short-range (<2m) location detection of the NFC tag by using multiple antennas. The resolution should be around 5 cm.

Best regards,

Dominik

  • 0
    TI__Guru* 91206 points

    Dominik - 

    the L/UHF systems we offer the parts for (like what you see in the link you provided) use LF wake pattern to activate the keyfob via the wake receiver (which is passive) , which starts up the MCU, which starts up the UHF transmitter, which responds to the vehicle's UHF receiver. so the controlled LF magnetic field restricts the distance of the wake so the vehicle will not open up from too far away and it conserves the battery life of the keyfob (this is why keyfob battery lasts so long)

    if you were to switch out for HF system, it could be done, but you would have to re-create alot of what is already done for LF in the HF band.

    LF is the correct choice here because of availability of released devices. (and you would couple this with LF transmitter based on TMS3705 or the upcoming TRF4140, either of which would generate the wake pattern (with MCU behind it, of course)