I2C on long cable

Post Reply
Posts: 1
Joined: Sun Jul 10, 2016 2:55 am
languages_spoken: english

I2C on long cable

Unread post by oleg » Fri Jun 15, 2018 3:50 pm

Hello everybody!

I was trying to connect i2c sensor to odroid xu4 on long cable - 30cm
I am using shifted shied in 5v mode. And on short cable (10cm) everything was ok but on long cable Odroid doesn't process anything.

So I disconnected my sensor and use i2c tool to check what I got
2018-06-15_0938.png (21.57 KiB) Viewed 160 times
Then I connected long cable without sensor and got
2018-06-15_0947.png (30.1 KiB) Viewed 160 times
So, my question is, how can it be that even with empty wires Odroid XU4 things that something was connected

Thank you

User avatar
Site Admin
Posts: 29408
Joined: Fri Feb 22, 2013 11:14 pm
languages_spoken: English

Re: I2C on long cable

Unread post by odroid » Fri Jun 15, 2018 4:52 pm

The TSX0108E IC on the Shifter Shield caused the problem due to very weak driving capability.

When the cable is very long, we have to use a different level shifter(BS138) something like this.
https://wiki.odroid.com/odroid-xu4/appl ... gpio/1wire

Post Reply

Return to “Hardware and peripherals”

Who is online

Users browsing this forum: No registered users and 5 guests