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RF430FRL15X external clock using crystal XIN XOUT pins missing

Beaten_together
Prodigy 60 points

I am evaluating the RF430FRL152 family of parts for a new design. I need a crystal for timing, but I did not find the XIN and XOUT pins on this part, only CLKIN/XIN. The Technical Reference Manual (SLAU506) hinted at XIN and XOUT on page 56 and 57 (section 3.2.5, External Clock Source), but there are no other reference to XOUT. Does anyone have any information on the XIN and XOUT functions with this RF430FRL15X family of parts?  Any help and information is much appreciated.

Related parts: RF430FRL151 RF430FRL152 RF430FRL153 RF430FRL154 

  • 0
    TI__Expert 7820 points

    The RF430FRL15xH family of parts does not have crystal oscillator capability.

    It uses instead an internal DCO for its timing.  From the ROM code it is set to run at 2 MHz.  That should be the max, lower frequencies are possible.

    The RF13M module is clocked using the external RF 13.56MHz clock, so it does not need a precise clock.

  • 0 in reply to Alex K.
    Prodigy 60 points
    Alexander,

    Thank you for the clarification. For data logging applications, which this type of BAP (battery assisted passive) RFIDs are often used for, the internal oscillator at 1-5% error is simply not going to cut it. And for logging, you are not always under the 13.56MHz field, so the uC needs to have a good external clock. The Technical Reference Manual (SLAU506) probably needs an update to remove references to XIN and XOUT.

    While on the topic of RF430FRL, could you verify that the Boot Data (page 41 of SLAS834C), Device Descriptors (TLV), and Peripheral Register Map (page 30 of SLAS834C) are stored in FRAM? I inferred this from the fact that there is zero EEPROM on this chip.

    Thanks for your insights.

    Best,

    LC
  • 0 in reply to Beaten_together
    TI__Expert 7820 points
    Larry,

    Yes, the Boot Data and TLV are FRAM memory type. You can be sure if you go to page 26 in SLAS834C, and look for the Boot Data (TLV) section, you will see that it is FRAM.

    Peripheral Register Map is volatile, however it is reset on power-up.

    I will work on getting the Technical Reference Manual corrected.

    Alex