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Original question:

LP876242-Q1: How to config the power-up sequence TinstX

LP876242-Q1: Device configuration

Atsu
Prodigy 180 points
Part Number: LP876242-Q1
Other Parts Discussed in Thread: TIDA-020047

Tool/software:

Hi,

Now I'm designing our custom board in reference to TIDA-020047.
Could you please share the setting file for LP876242-Q1?

A deference regarding hardware around PMIC is using I2C instead SPI.
Shoud I make only a modification of the register value relating interface? 

And I need a similar device with LP87524P, which starts by only enabling EN1.
I couldn't understand in this thread how the initial setting of the device in TIDA-020047 work. 
LP876242-Q1: How to config the power-up sequence TinstX - Power management forum - Power management - TI E2E support forums
Will I need to modify register setting if I want to start up the device without any MCU outside?  

And besides, when and how should I load the setting to NVRAM?  Before mounting the device?

Best regards,
Atsu

  • 0
    TI__Genius 17930 points

    Hi,

    You need to use the OPN used in TIDA/020047. LP876242B0RQKRQ1 this is SPI configured. You can use the scalable GUI and update to your requirement in this case I2C. 

    The device has NVM programmed you can use the GUI to update the NVM. 

    https://www.ti.com/lit/pdf/slvubt8 : See this user guide on how to make the updates. 

    Regards,

    Ishtiaque 

  • 0 in reply to Ishtiaque Panhwar
    Prodigy 180 points

    Hi Ishtiaque,

    Thank you for your reply.
    My appologies for my poor understanding, let me ask again.

    'LP876242B0RQKRQ1' is pre-programmed for TIDA/020047. But it can be updated by the GUI including swithing interface to I2C instead SPI.
    Is that correct?
    Then if I want to use I2C, should I program it before mounting the device on the PCB to replace its interface?

    Regards,
    Atsu

  • 0 in reply to Atsu
    TI__Genius 17930 points

    Hello Atsu,

    Atsu said:
    'LP876242B0RQKRQ1' is pre-programmed for TIDA/020047. But it can be updated by the GUI including swithing interface to I2C instead SPI.
    Is that correct?

    Yes that is correct. 

    Atsu said:
    Then if I want to use I2C, should I program it before mounting the device on the PCB to replace its interface?

    First you need to power up the device with SPI connected. Once you re-program the I2C interface configuration successfully then you need to connect I2C with set address and re-power up the device. if you are using EVM, then use user guide to read about the SPI and I2C connections. 

    Regards,

    Ishtiaque

  • 0 in reply to Ishtiaque Panhwar
    Prodigy 180 points

    Hi Ishtiaque,

    Thank you for the clarification!

    Regards,
    Atsu