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Original question:

[FAQ] TPS659037: Can I run the PMIC without OTP or modify the OTP?

TPS659037: TPS659037

Ioan Marusca
Intellectual 260 points
Part Number: TPS659037
Other Parts Discussed in Thread: TPS54335A

In regards to support thread "TPS659037: Can I run the PMIC without OTP or modify the OTP"

Would it be possible to offer an ordering option for the PIMIC where OSC16M_CFG=1 without going through the complex process of custom OTP ? (it would save a lot of oscillators that are not needed and are scarce to get)

Regards

  • 0
    TI__Expert 6700 points

    Hello Ioan,

    Unfortunately the OTP will load as soon as the part is powered up so there is not really a way to run it "without OTP". After power-up, you cannot necessarily modify the OTP directly, but you are able to turn on/off various outputs as well as change their output voltages. 

    I can check to see if there is an existing OTP with the OSC16M_CFG=1. I will get back to you on Monday with this result.


    Regards,

    Alex

  • 0 in reply to Alex Saenz
    TI__Expert 6700 points

    Ioan,

    In order for me to recommend an OTP, can you give me an idea of which SMPS/LDOs you need turned on/off and set to which values? Or do you have an existing device OTP that you want the new part to mimic with the exception of the OSC16M_CFG?

    Regards,

    Alex

  • 0 in reply to Alex Saenz
    Intellectual 260 points

    Using TPS6590378ZWS. Thx.

  • 0 in reply to Ioan Marusca
    TI__Expert 6700 points

    Ioan,

    The closest OTP configuration I could find to that one is TPS659039A389IZWSRQ1. The only major differences are:

    • VSYS_MON = 2.3V in new OTP (was 3.1V)             
      • This means that the voltage which takes the part from OFF to ACTIVE state as well as ACTIVE to BACKUP is now 2.3V

                                                    

     

    • GPIO2 pin function = 0/GPIO_2 in new OTP (was 1/REGEN2)
      • This makes the GPIO2 pin go from an active HI push-pull output to a generic IO pin

    Feel free to let me know if you have any other questions.

    Regards,

    Alex

  • 0 in reply to Alex Saenz
    Intellectual 260 points

    The changes are:

    1) reset value for register 1A3 filed TRESHOLD was 010110 and now will be 000000

    2) reset value for register 1A2 field TRESHOLD was 10110 and now will be 00000

    3) reset value for register 1B4 field REGEN2_OD was 0 and now is 1. 

    But according to sliu011e.pdf the 6590379xxxx needs 5V for operation of switches and 6590378 works with 3.3V. So I cant use this part because the system doesn't have more than 3.3V available for switchers. There is also a different usage/mapping of switchers. 

  • 0 in reply to Ioan Marusca
    TI__Expert 6700 points

    Ioan,

    Can you elaborate on why you need 3.3V operation for the switches?  When you reference sliu011e.pdf and say that the switches need 3.3V, are you referring to Figure 1 on page3? If so those switches and their supply are both external and would not depend on the PMIC's capabilities. Please provide more detail whenever you get a chance. Thank you.

     

    Regards,

    Alex

  • 0 in reply to Alex Saenz
    Intellectual 260 points

    Correct I'm referring to Fig.1 in sliue011e.pdf. This resembles the design with on exception. The "12V input power" bloc doesn't exist. It is a "3.3V input block" for the whole board and TPS54335A is no needed. The 5V is created with a 3.3V to 5V boost.
    The second problem is that SMPSs and LDOs assignment to CPU and board is as per Fig.1 (layout already executed).

  • 0 in reply to Ioan Marusca
    TI__Genius 12735 points

    Hi Ioan,

    Unfortunately this OTP is going to be the closest OTP available to the original OTP you have created your design around. The 12V power input is not required if there are already 3.3V and 5V supplies available on the board. What is important is that the input pins for the PMIC and any external power components are powered using the correct 3.3V or 5V input to achieve their outputs. 

    Best regards,

    Layne J

  • 0 in reply to Layne J
    Intellectual 260 points

    How difficult is to modify an OTP (in my case requires changing a single bit) and have it as orderable part ? 

  • +1 in reply to Ioan Marusca
    TI__Genius 12735 points

    Hi Ioan,

    There are business justifications required for creating a new orderable part number. I would recommend reaching out to your TI sales representative for more information.

    Best regards,

    Layne J