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RF430CL330H: Detecting NFC magnetic field

Ali Aljumaili
Prodigy 250 points
Part Number: RF430CL330H
Other Parts Discussed in Thread: TIDA-00217, MSP430FR2633,

Hi,

I'm using an MSP430fr2633 together with the RF430CL300H NFC Transponder. I have plans for a batteryless design, and I have an operating voltage of 2.5V utilising a battery, as well to a using a half bridge rectifier like in the TIDA-00217 design.

My question is can my MSP430FR2633 detect the existence of the RF? or do I need to have an external circuit like described in sloa200

The second question is: I will be running the RF430CL330H on 2.5V damage the chip even though I will only use when an RF field is present?

  • 0
    TI__Guru*** 128085 points
    Hello Ali,

    I really cannot comment on the abilities of the MSP430FR2633, but in general if you wanted to sample the RF field via capture/compare, it could be possible. Why wouldn't the RF430CL330H field sense work for you though?

    If powered by RF, the RF430CL330H can operate with as low as 2V input on the chip so as long as it's RF powered only there would be no damage of the device.
  • 0
    TI__Guru*** 128085 points
    Hello Ali,

    Can you elaborate what part of my prior post did not answer your questions?
  • 0 in reply to Ralph Jacobi
    Prodigy 250 points
    Thank you for the answer Ralph. I have not formalized my question precisely enough. It is more of a concern about operating at 2.5V without damaging the device and needing to sense the RF using external circuitry. It will be running on that voltage for years, it states that in the datasheet for the RF430CL330H that 0 current is drawn between 2V to 3V.

    Does this mean I do not need any wake-up circuit and the RF430CL330H will be safely activated when an RF field is present without damaging the chip? Could you confirm that?
  • 0 in reply to Ali Aljumaili
    TI__Guru*** 128085 points
    Hello Ali,

    Provided you are using the RF430CL330H to handle the wake-up functionality, then yes no external devices are needed. The only 'external circuitry' would be the diodes to help rectify the RF field such as seen in TIDA-00217. The RF430CL330H will reliably detect an RF field and send a wake signal to your host MCU, and will have no issue with operating 2.5V for years. That is the intention of the RF powered nature of the device.