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LP8733: lp3387　Write the program before implementation

yousuke nasu
Intellectual 880 points

Part Number: LP8733

How to mount lp8733 on the board after writing the program in advance

  • 0
    TI__Genius 11020 points

    Hello Yousuke,

    I'm not sure what you mean, could you clarify? 

    If you are thinking of writing new settings on the device and then assembling it to the system, it is not possible. There is no user programmable non-volatile memory in LP8733 device family. You can only write to registers, which are volatile memory and when you power it down the new settings will be lost. So if you need to have settings which are not default, you would need to rewrite the settings in system on each power up, since on power down settings will be lost. You can see more details on the Configuration Guide: https://www.ti.com/lit/ug/snvu582a/snvu582a.pdf

    Thanks.

    Regards,

    Tomi Koskela

  • 0 in reply to Tomi Koskela
    Intellectual 880 points

    Hello Tomi Koskela

    What I want to do is change the output voltage of LP8733 from 1.8V to 1.24V.

    I want to know how to do it.

  • 0 in reply to yousuke nasu
    TI__Genius 11020 points

    Hello Yousuke,

    You would need to power on the device (keep EN low), then write the new settings through I2C (BUCKx_VOUT register). 0xB1 = 1.8V, 0x7D = 1.24V. Once the settings are written you can turn on the outputs by setting EN pin high. 

    Note writing registers does not change the voltages permanently and once you power the device down the new settings will be lost. So it needs to be done on each power up.

    Thanks.

    Regards,

    Tomi Koskela