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BQ25618: I2C specification

Toshiro Imi
Expert 6930 points
Part Number: BQ25618

Tool/software:

Hello,

A customer asked about BQ25618 I2C questions as below.

1) SCL, SDA theshold voltage at 3V Pull up rail

Could you please let us know SCL, SDA threshold will be changed if 3.0V like different Pull Up voltage rail. Although it looks same.

2) SCL, SDA timing

Could you let us know SCL, SDA timing requirement.

Best regards,

  • 0
    TI__Mastermind 27660 points

    Hello, 

    Please see my comments below. 

    1) It is acceptable to use a higher voltage pullup rail for SCL and SDA such as 3V. The logic high and low voltage thresholds will remain the same. 

    2) Please refer to official I2C specification, which can be found online, for necessary timing requirements. Relevant timing requirements are listed in Table 11. BQ25618 is compatible with up to 400kHz SCL clock frequency. 

    Best Regards,

    Garrett

  • 0 in reply to Garrett Kreger
    TI__Expert 6930 points

    Hello,

    Thank you very much for your help. The following is the customer feedback.

    1) Thank you. This is closed.

    2) Could you share the specification such as shown in below.

    Best regards,

  • 0 in reply to Toshiro Imi
    TI__Mastermind 27660 points

    Hi Toshiro, 

    We do not list I2C related timing specs in our battery charger IC datasheets. The customer simply needs to ensure their system meets the requirements listed in the official I2C specification. 

    I have liked the specification here: https://www.nxp.com/docs/en/user-guide/UM10204.pdf. As I mentioned in my last reply relevant timing specs are listed in Table 11 on page 44. 

    Best Regards,

    Garrett