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LMX2592: 7.5.1 Recommended Initial Power on Programming Sequence

Hirotaka Matsumoto
Guru 27585 points
Part Number: LMX2592
Other Parts Discussed in Thread: LMX2594

Hi all

Would you mind if we ask LMX2592?

Comparied with LMX2594's description of Recommended Initial Power on Programming Sequence,
in case of using LMX2592, it seems that it is not neccessary to insert "Wait 10ms".
So, just in case, when we use LMX2592, we don't insert "Wait 10ms" between "4. Program the remaining registers" and "4. Program the remaining registers".
Is our recognition correct?

Then, why does LMX2594 require to insert  "Wait 10ms"?
Is it relation to "REVERSE order from highest to lowest"?

<LMX2592's description>


<LMX2594's description>


Kind regards,

Hirotaka Matsumoto

  • 0
    Guru 27585 points

    Hi team

    We guess that your days are so busy, however if you have some reply for our post, could you let us know?

    Kind regards,

    Hirotaka Matsumoto

  • +1
    TI__Genius 12560 points

    Hi Hirotaka-san,

    In the LMX2594, the 10ms wait time is optional and it is intended to ensure the internal LDOs have been settled down before doing another VCO calibration. If there is sufficient time between Vcc power up and the first register write (between step 1 and 2), it doesn't necessary need step 5 and 6.

    Similar can be required for LMX2592 also, if the internal LDOs are not settled just after the Vcc power up.

    Yes, all these device required the register programming in descending order.

    Thanks!

    Regards,

    Ajeet Pal

  • 0 in reply to Ajeet Pal
    Guru 27585 points

    Ajeet san

    Thank you for your reply!
    OK, we got it.

    Kind regards,

    Hirotaka Matsumoto