• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 253 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ25798: I2C

Yoshinobu Kagawa
Expert 2030 points
Part Number: BQ25798


Tool/software:

1) I would like to pull up the I2C line of the bq25798 with +5V, the microcontroller operating voltage.
    I am aware that this is not a problem since it is within the absolute maximum ratings, but please let me know if there are any problems.
    

2) The datasheet lists the specs when the I2C communication line is pulled up at 1.8 V. Do these spec values also apply when the pull-up voltage is 5 V?



3) I2C specs such as setup-time, hold-time, etc. are not listed in the data sheet.
    Is it correct to understand that I2C specs not specified in the bq25798 data sheet are in accordance with the NXP standard?
    (Reference) NXP Standards Documentation Page 44

https://www.nxp.com/docs/en/user-guide/UM10204.pdf

Regards,
Kagawa

  • 0
    TI__Mastermind 20570 points

    Hi Kagawa,

    Thanks for reaching out. We are in US holiday weekend. A team member will respond to you mid next week. Thanks for your understanding

  • 0
    TI__Intellectual 1110 points

    Hi Kagawa,

    1) The device should work at 5V but we haven't tested at 5V and can't warranty operation outside of datasheet spec.

    2) The device should work at 5V but we haven't tested at 5V and can't warranty operation outside of datasheet spec.

    3) We are compatible with the NXP spec but are not 100% compliant. For example, the NXP spec hi and low voltages are percentages of pull up where we are a fixed pullup voltage.

    Regards,

    Jared Baxter