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Maximum Current Ratings at OMAP-L138 Power Terminals

Daisuke Maeda
Guru 20465 points

Other Parts Discussed in Thread: OMAP-L138, OMAPL138

What are Current ratings at Power Terminals in the worst case?
For AM335x it is described in the datasheet.
For OMAP-L138 it is not.

Is "Imax" specified in "Table 1" in the following document the Maximum Current Ratings for each power supply voltage?

http://www.tij.co.jp/jp/lit/an/slva343b/slva343b.pdf
http://www.tij.co.jp/jp/lit/an/slva342b/slva342b.pdf
http://www.tij.co.jp/jp/lit/an/slva340a/slva340a.pdf

If so what is "Imax" for 1.3V CVDD?

Best regards,

Daisuke

 

  • 0
    Guru 20465 points

    Must the Power Consumption Spreadsheet be used to estimate the Maximum Current Ratings?

    Best regards,

    Daisuke

     

  • 0 in reply to Daisuke Maeda
    TI__Guru* 86265 points

    Hi Daisuke

    Yes, the recommendation would be to calculate the max current rating based on your end use-case and peripheral utilization and programming the power consumption spreadsheet for it, for the desired operating point/ frequency/temperature requirements.

    This is traditionally how power consumption is reported and communicated on most of the DSP processors datasheets. There is typically no Imax specifications provided in the datasheets (unlike AM335x)

    You do have some information on www.ti.com/processorpower , you can choose OMAPL138, however as you mention this data set is limited to 1.2V CVDD. For 1.3V/456 MHz it would be best to use the power estimation spreadsheet.

    Regards

    Mukul

  • 0 in reply to Mukul Bhatnagar
    Guru 20465 points

    Hi Mukul,

    Thank you for your reply.

    I guess that Imax in the power solution application report is the maximum current ratings for typical system and is not absolute.
    Therefore I guess that the Power Consumption Spreadsheet should also be used for the system limited to 1.2V CVDD.

    Best regards,

    Daisuke

     

  • 0 in reply to Daisuke Maeda
    TI__Guru* 86265 points

    Daisuke

    I do not understand your conclusion, can you clarify further?

    You should be able to use the power spreadsheet to estimate worst case power for the end application, with 1.3V CVDD as the spreadsheet supports 1.3V CVDD. Originally OMAPL138 only supported 1.2V CVDD/300 MHz , eventually the support for 1.3V/456 MHz was added however unfortunately the power solution application reports were not refreshed.

    These reports and reference designs are very handy in general, and were very useful especially when the power estimation spreadsheet was not available. With power estimation spreadsheet available, it is expected that the customers are able to leverage this tool for power supply sizing, putting their specific use-case.

    Hope this helps.

    Regards

    Mukul

  • 0 in reply to Mukul Bhatnagar
    Guru 20465 points

    Hi Mukul,

    Thank you for your reply.

    These application reports may not be useful for all 1.2V CVDD cases because the Imax may not be in worst case, therefore the power spreadsheet should also be used for 1.2V CVDD.

    Is my understanding correct?

    Best regards,

    Daisuke

     

  • 0 in reply to Daisuke Maeda
    TI__Guru* 86265 points

    Hi Daisuke

    Yes your understanding is correct.

    Thank you for clarifying this.

    Regards

    Mukul

  • 0 in reply to Mukul Bhatnagar
    Guru 20465 points

    Hi Mukul,

    Thank you for your reply.

    Best regards,

    Daisuke