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I2C bq25120 settings

hurtz hurtz
Prodigy 20 points
Other Parts Discussed in Thread: BQ25120

Hello I have a problem with the right settings of the bq25120,

In the default settings of the bq25120 there are 1.8V on the SW pin. And now my question: If I set the output Voltage from the default 1.8V to 3.3V over I2C. Then a communicate over I2C is furthermore possible, when the I2C-Pullup-Resistors are furthermore powered from a Power-Supply of 1.8V. Or should I also change the Voltage of the I2C-Pullups-resistors if I change the default output-voltage from 1.8V to 3.3V.

  • 0
    TI__Genius 12485 points

    Hurtz,

    If you set the I2C voltage to 3.3V, then you will have to have your "high level" at atleast 2.475V. Is your I2C bus pulled up to VSYS?

    regards,

    Gautham

  • 0 in reply to Gautham
    Prodigy 20 points
    Hello Gautham,

    the I2C isn't pulled to VSYS. I used PMID/VINLS for some Buck, Boost Converters to generate 5V and 1.8V. The I2C Bus is pulled up to the Buck-Converter with 1.8V all the time. Now my questions was if I set VSYS from the default 1.8V to 3.3V than I should also powered the I2C Bus with 3.3V?

    Should the I2C Bus pulled up to VSYS or is a communication also possible if VSYS is set up to 3.3V and the I2C Bus is further pulled up to 1.8V?

    regards,

    Hurtz