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RF430FRL152H: RF430FRL152H GUI Interface : could not read from device

Minhyung Kang
Intellectual 490 points
Part Number: RF430FRL152H

Hi. I am Minhyung.
I am going to use a RF430FRL152H and an MCU to build a custom device that will drive two LEDs and receive output through a Ligthsensor.
So first we put each chip on the PCB and then we made the test circuit on the breadboard. Antenna used RF430FRL152HEVM by separating it. As a result of operation, VDDSW: 1.5V, VDDH 2.1V works well. However, when I check the connection status with the GUI, I get an error message "could not read from device". What is the problem?

If the LED is connected, VDDH will drop to 1.8V. Is this related?

A circuit diagram is attached.

  • 0
    TI__Mastermind 18265 points
    Hello Minhyung,

    I would first try to minimize the circuit and disconnect all the additional circuitry, I.e. MCU, LED etc.

    As you wrote, voltages are ok, so this is a good base.
    Is the RF430FRL152H device you used a new (never programmed) device?
    If not, it could also be the case that the memory is corrupted, or contains the wrong code.
    New delivered devices are preprogrammed and should respond to ISO15693 commands.

    You can also check if a NFC enabled smartphone can detect you device.

    Best regards,
    Helfried
  • 0 in reply to Helfried Vollbrecht
    Intellectual 490 points

    Dear Helfried,

    Thank you for your reply. I solved the problem thanks to you. Your opinion is right. My chip was programmed, so I replaced the new chip.

    However, when the VDDH pin was connected to the MCU, it still did not work. I checked the current of the LED. And it was pretty high. So I connected a resistor to the LED and it finally works fine.

    I thought that too much current on the LED side would cause NFC communication to fail.

    What do you think is the exact cause of this? I'm curious about your opinion.

    Best regards,
    Minhyung