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LAUNCHXL-F28P65X: External Clocking for F28P65XX device

Fikri Serkan Yavuz
Prodigy 10 points
Part Number: LAUNCHXL-F28P65X


Tool/software:

  • When I look at the LAUNCHXL-F28P65X, I realize that BAW Oscillator which PN:LMK6CE02500CDLFT  and CLOCK BUFFER are used for clocking in the schematic. Could I use 25 MHz oscillator instead of 25 MHz BAW Oscillator + CLK BUFFER for this application?  What would TI suggest on this usage case?
  • Also, In our design, the ETHERCAT will not be featuring, instead CAN-FD will be featured. For that purpose, I would like to know if CLOCK BUFFER is still needed in case EtherCAT is not featured, which means that single CLOCK is enough for MCU.?

  • 0
    TI__Mastermind 38160 points

    Hi Fiki,

    Yes, you certainly can use a single-ended 25MHz oscillator for X1 clock.  The reason that the 25MHz clock is buffered is that the LAUNCHXL design featured a precision central clock source which is the BAW that also provides CPU clock  (X1) and the EtherCAT PHY clocks which require 25MHz.  If your application does not require EtherCAT, then you can remove the buffer and just clock everything with the 25MHz precision single-ended oscillator.  CAN-FD clock will then be derived from CPU clock (SYSCLK).

    Regards,

    Joseph

  • 0 in reply to Joseph Casuga
    Prodigy 10 points

    I got it , Thank you :)