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AKril.1
Visitor II
June 1, 2021
Solved

AN5322 impedance measurement

  • June 1, 2021
  • 1 reply
  • 718 views

Hi, i am trying to measure the matching impedance of the antenna.

I have the following questions:

  1. What is the driver stage and how can i turn if off?
  2. How can i ensure that register 0x28 is set to 0x0F?
  3. How can i ensure that tr_am bit is set to 1?

Thank you in advance.

0693W00000BZmWdQAL.jpg

    This topic has been closed for replies.
    Best answer by Ulysses HERNIOSUS

    Hi AKril.1,

    turning off the driver stage is achieved by setting register 28h lowest nibble to 0xf. Bit tr_am is located in register 03h. How you achieve this depends on what you have. If you have your own board / running purely embedded you will need to issue proper register write commands over I2C or SPI (e.g. st25r3916WriteRegister()).

    The easiest way is to use ST25R3916-DISCO PC GUI which gives you direct click-access to all registers.

    Best Regards, Ulysses

    1 reply

    U
    Ulysses HERNIOSUSAnswer
    Technical Moderator
    June 1, 2021

    Hi AKril.1,

    turning off the driver stage is achieved by setting register 28h lowest nibble to 0xf. Bit tr_am is located in register 03h. How you achieve this depends on what you have. If you have your own board / running purely embedded you will need to issue proper register write commands over I2C or SPI (e.g. st25r3916WriteRegister()).

    The easiest way is to use ST25R3916-DISCO PC GUI which gives you direct click-access to all registers.

    Best Regards, Ulysses

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