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TPS65400: Configurations revert back to default after power off-on!

yash deep
Prodigy 10 points
Part Number: TPS65400

Hi,
i am Using TPS65400 in a custom made PCB. For communication with the I2C bus I am using FTDI2232H module via Python. 
I am able to write into the TPS65400 and change its Vref value (1.4)  for my particular application but after the switching off my board and again on, it becomes default (0.8) and I again have to program that.

Its mentioned in the datasheet that the configurations would be stored in EEPROM and so it should remain same even after power on.
Any clues where I am going wrong? Or as to what i can check?


Thanks and regards.

  • 0
    TI__Expert 7500 points

    Hi Yash,

    Please check the (11h) STORE_DEFAULT_ALL register. The STORE_DEFAULT_ALL command saves the PMBus parameters from operating memory into the default store in data flash (EEPROM). In other words, upon issuing STORE_DEFAULT_ALL, contents of the configurations are saved to the default store in data flash. 

    You can refer datasheet 8.6.1.5 and Table 43. Example Configuration Script for Internal Operation.

    Thanks,

    Lishuang