BQ25618: I2C specification

Toshiro Imi

Expert 7010 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,

5 months ago

0 Garrett Kreger 5 months ago

TI__Mastermind 28145 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 Toshiro Imi 5 months ago in reply to Garrett Kreger

TI__Expert 7010 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 Garrett Kreger 5 months ago in reply to Toshiro Imi

TI__Mastermind 28145 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

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BQ25618: I2C specification