• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 62 subscribers
  • Views 277 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS650861: VTT ILIM Register

Don Schelle
Expert 4150 points
Part Number: TPS650861

Hello,

With reference to this note in the document linked below:

- https://www.ti.com/lit/ug/swcu188/swcu188.pdf

- 

I can't find a register with these settings anywhere in the datasheet or user guides.   Would someone please direct me to the correct location?

Don

  • 0
    TI__Genius 13216 points

    Hi Don,

    This will be I2C address 0x38 register 0x53

    Thanks,

    Daniel W

  • 0 in reply to Daniel W
    TI__Expert 4150 points

    Great, and where can I find a bit-description for that particular register?   Is there a TRM for this device?

  • 0 in reply to Don Schelle
    TI__Genius 13216 points

    Hi Don,

    All of the register map that is shared is in the datasheet. I would recommend using the OTP generator as it will take care of this register. Or you can read the settings for this register from the OTP generator.

    https://www.ti.com/lit/zip/swca303

    Thanks,

    Daniel W

  • 0 in reply to Daniel W
    TI__Expert 4150 points

    Thanks Daniel,

    Are you referring to this datasheet:

    - https://www.ti.com/lit/ds/symlink/tps650861.pdf

    Specifically pages 83 and 84:

    There are additional registers not described in the datasheet.   I suspect that 0x53h is one of those.    If I'm mistaken, please do correct me on this point by identifying the section/page number of the datasheet where I can find this information.

    I've also looked in the OTP generator script tool and found that the script writes 0xA8h to register 0x53h at I2C address 0x38h.   Though no information is given in the tool and what this register actually does, nor is there any reference that I could find regarding VTT ILIM. 

    If a write is all that's required, then the information contained in the TPS65086100 programming manual (section 4.5 script generator sheet) on page 11 requiring the read-modify-write is incorrect.   

    - https://www.ti.com/lit/ug/swcu188/swcu188.pdf

    Summarizing, please indicate whether a simple write is required (and confirm that the TPS65086100 Non-Volatile Memory Programming Guide will be amended), or whether a read-modify-write is required (and confirm the correct bits of the register by way of register bit definition).

    Don 

  • +1 in reply to Don Schelle
    TI__Genius 13216 points

    Hi Don,

    Not all the registers are shared in the datasheet. But that is the only document shared with a register map.

    As for the interpretation of the programming guide and the OTP generator, the programming guide is simply stating that specific values are necessary for the VTT ILIM register and so if this register is being changed manually on its own the best way to ensure these values are correct is a read-modify-write. However, the OTP generator sets these values correctly automatically before writing and thus does not need to follow the read-modify-write process.

    In conclusion, the OTP generator can be used as is and does not need to be modified to include a read.

    Thanks,

    Daniel W