TUSB320: INT_N Questions

Alfred Logico

Part Number: TUSB320

Hi Team,

There is a question about INT_N open drain functionality at TUSB320LI from my customer.

At I2C operation description(7.2.4) , it´s mentiond, that the pin is in open drain configuration an needs an additional pull up, at reference schematic of UFP I2C mode operation(8.2.3) the pin is pulled up to VDD which is different as I2C (1V8 or3V3) at reference circuit… and aslo a note, that INT_N sould have a pull up to VDD…

For my understanding, this makes no sense in this usecase.

Can Please check the behavior of the INT_N pin in UFP I2Cconfiguration internally to help to clarify…

Thanks!

Best Regards,

Alfred Logico

over 6 years ago

0 Brian Zhou over 6 years ago

TI__Guru*** 145650 points

I2C pin SCL/SDA is 3.3v IO which is different from other pins, INT_N pin is pulled up to VDD, which can be 2.7v to 5v. but when using I2C, VDD must be >3v

0 Alfred Logico over 6 years ago in reply to Brian Zhou

TI__Expert 5060 points

Hi Brian,
Thanks for the reply. My customer needs 1.8V host interface for the I2C and interrupt. Do we have a solution that can support this?

Thanks!
Best Regards,
Alfred

0 Alfred Logico over 6 years ago in reply to Alfred Logico

TI__Expert 5060 points

Hi Brian,

I want to clarify your statement. It says in the electrical characteristics below that I2C of the TUSB320LI can be used with a 1.8V supply. Can you confirm?