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TMS320F28388D: Crystal

Ralf Eckhardt
Intellectual 855 points
Part Number: TMS320F28388D


Hello,

do we have an apps note helping the crystal selection or recommendations for crystals to be used with the TMS320F28388D device?  They must be automotive grade and support 125degree C.

Thanks and BR Ralf

  • 0
    TI__Guru 50611 points

    Hi,

    Due to Thanksgiving Holiday, the subject matter expert is out of office. We will get back to you next week.

    Thanks & Regards,
    Santosh

  • 0 in reply to Santosh Jha
    TI__Mastermind 38920 points

    Hi Ralph,

    There is no specific app note for crystal selection for the F2838x device however section 7.10.3.4 of the Datasheet provides the basic crystal parameters that will work for the F28388x device:

    Best regards,

    Joseph

  • 0 in reply to Santosh Jha
    TI__Intellectual 855 points

    Joseph, 

    my customer is evaluating the crystals with the following parameters.

    ABM8AIG-20.000MHZ-2Z-T , 3.2 mm x 2.5 mm, 0,467EUR@1k, CL = 18pF, ESR = 50Ohm, -40 to +125°C

    ECS-200-12-33Q-JES-TR, 3.2 mm x 2.5 mm, 0,51EUR@1k, CL = 12pF, ESR = 60Ohm, -40 to +125°C

    Unfortunately, the ESR is not in the range specified but the DS.

    Is there any possibility to use these crystals together with the F28388 or can you propose crystals which meet his requirements and the required ESR by our device?

    Thanks and BR Ralf

  • 0 in reply to Ralf Eckhardt
    TI__Mastermind 38920 points

    Hi Ralph,

    Looking at past characterization data for crystals on C2000 devices, at fundamental crystal frequency of 20MHz, max ESR is 50 ohms.  We have not looked at crystals with ESRs beyond 50ohms so recommendation is to go with ABM8AIG-20.000MHZ-2Z-T or ABM8AIG-20.000MHZ-12-1ZT-T (CL=12pF; ESR = 50ohms) as the parameters on these parts are in line with the crystals evaluated early on.  This would at least reduce the risk of a start up issue.

    It is still strongly recommended that the crystal is characterized in the application board to ensure proper XTAL operation with the F28388 device, especially at the extreme temperature conditions.

    Best regards,

    Joseph