OPT3101: 1.8V I2C and IO

Casey Walsh

Part Number: OPT3101

Tool/software:

I'd like to operate the OPT3101 in a generally 1.8V system. Is this the correct power supply network to use:

0 Joseph Scherphorn 4 months ago

Hello Casey,

This seems to follow are recommendations.

This should cover your points of interest.

Thank you,

Joseph Scherphorn

0 Casey Walsh 4 months ago in reply to Joseph Scherphorn

Close. I saw that thread too. The difference is that I'm running IOVDD off of 1.8V.

0 Joseph Scherphorn 4 months ago in reply to Casey Walsh

What is the purpose of not following this design recommendation?

You are already bringing in a 3.3 and 1.8 V rail for proposed solution, I encourage you to tie IOVDD to the 3.3 V rail

0 Casey Walsh 4 months ago in reply to Joseph Scherphorn

The I2C and the digital lines must be run at 1.8V.

+1 Joseph Scherphorn 4 months ago in reply to Casey Walsh

Understood, makes sense, I do not see an issue with this implementation.