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LP8758-E0: LP8758

Barry Grquinovic
Prodigy 80 points
Part Number: LP8758-E0
Other Parts Discussed in Thread: LP8758

Reading the datasheet, during the startup sequence there is mention of loading the OTP into the registers of the part.  Question: Can I set default values for each of the buck regulators in the OTP area ?  How do I access the OTP area?  

  • 0
    TI__Genius 13850 points
    Hi Barry,

    OTP is programmed as a part of the manufacturing process. It can not be accessed or modified afterward.

    However all registers in datasheets which are marked as writable you can change default values. Please note that register values will remain as long as device stays powered. If NRST is toggled or software reset is set or supply voltage lowered under UVLO level the device will load register values from OTP again.

    If you are interested in a custom OTP for LP8758 device please contact your local TI sales representative.

    Best regards,
    Jari Niemelä
  • 0 in reply to Jari Niemela13
    TI__Mastermind 48691 points

    Hi Barry,

      In case you use the device as a peripheral power sources, there is a way to use it without OTP access; the way is described as below:

    1. Keep its EN1/2 pins logic low when I2C host power up;
    2. Rising its NRST pin to logic high;
    3. Waiting for at least 1.2mS before I2C writing (it's the time for OTP bits loaded to registers);
    4. Change those registers default values to your expect values by I2C access;
    5. Rising EN1/2 pins logic high, and then you will get what you expect. the total time should be less than 2mS from I2C host power up.

    Thanks!

    Phil