TS3USB30E: different PUs on input and output

Sagiv Zeltser

Part Number: TS3USB30E

Hey,

We are using this switch with I2C signal to connect it to two different cameras.

The input I2C signal is pulled up to 3.3V while the cameras need 1.8V.

I was wondering if the input and outputs are buffered and so allow to connect the outputs with PU to 1.8V like in the pic below or is a level shifter needed?

thanks,

over 2 years ago

0 Brian Zhou over 2 years ago

TI__Guru*** 146535 points

you need AC cap on pin3 and 5.

0 Sagiv Zeltser over 2 years ago in reply to Brian Zhou

Prodigy 30 points

Hey,

I'm not sure how will this help, can you please elaborate?

thanks,

0 Brian Zhou over 2 years ago in reply to Sagiv Zeltser

TI__Guru*** 146535 points

0 Sagiv Zeltser over 2 years ago in reply to Brian Zhou

Prodigy 30 points

Hey,

not sure how will this work, i simulated a representive circuit and if the caps are smaller than 1mF the signal looks bad, and in addition there is an undershoot that may impact the I2C signal