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OMAP-L138: A question about TMS320C6748 and OMAP-L138(456MHz)

chen chen35
Intellectual 875 points
Part Number: OMAP-L138
Other Parts Discussed in Thread: TPS650061, TMS320C6746, , TMS320C6748, OMAPL138

Hi all

     Before our project, we used TMS320C6746  and used the TPS650061 for power supply.Now I want to upgrade the processor to OMAP-L138(456MHz). Can I replace 6746 directly with OMAP-L138 P2P? If the TPS650061 also  supported ? Thank you.

  • 0
    TI__Guru**** 161600 points

    Hi,

    OMAP-L138 and TMS320C6748 are pin compatible devices (with only difference being the ARM core in OMAP-L138), you can take a look at their reference designs and see that the LCDKs are the same. 

    I think that TMS320C6746 & TMS320C6748 are also pin compatible, so you should be able to just replace the device with OMAP-L138. To be sure check Section 3.6 Pin Assignments in the datasheet of both devices (TMS320C6746 and TMS320C6478).

    As for the TPS650061, as long as it complies with the power-up sequence of the processor, see Section 6.3.1 Power-On Sequence of OMAP-L138 Datasheet, and matches the power consumption in your board and the Datasheet Recommended Operating Conditions., you should be able to use it.

    Best Regards,
    Yordan

  • 0 in reply to Yordan Kovachev
    Intellectual 875 points

    Hi Yordan

         I searched for some information.TMS320C6746 work on 300MHz，the total power need is  426.93mW，OMAP-L138 work on 300MHz，the total power need  is  479.73mW，I want to kown if OMAP-L138（456MHz version） work on 300MHz ，how many  total power does the chip need f？

       Now when I test the OMAP-L138（456MHz version） in -40℃，sometimes the OMAP138  crashes after working for a few seconds. Then I power off and restart it will be work ,I want to kown what reason  caused the problem.Is it because the power is not enough?Please help ，thanks！

  • 0 in reply to chen chen35
    TI__Guru**** 161600 points

    Hi,

    Sorry for the delayed reply, I was OoO.
    Just wanted to let you know that I will continue looking into this and update the thread when I have something useful.

    Best Regards,
    Yordan

  • 0 in reply to chen chen35
    TI__Guru* 78325 points

    Hi Chen

    There is very limited description of your failure at -40C - what makes you think that this is related to power supply sizing?

    Few questions

    1) If you had a stable product with c6746 - did you confirm that actual power consumption for your board/end application with c6746?  The power data that you refer to are good estimates for the devices, but it would be good for you to confirm that your previous design was adequately sized.

    2) Can you confirm that the only change that was made in the hardware was changing c6746 with OMAPL138?

    3) Are you running Linux? If not, what "tests" do you run at -40C. 

    4) Can you confirm if similar tests were run on c6746 based board/product they don't fail?

    Usually we see customers seeing failures at lower temp due to issues like crystal startup irregularities, or some other on board component stability, not power.

    Have you made sure that -40C the power supply ramp is similar to what you see at room /nominal temperature etc?

    Regards

    Mukul