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Active terminator I2C not working at 20'
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Active terminator I2C not working at 20'

by SkyRyder on Wed Oct 20, 2021 6:35 pm

Hi all,

I have tried to implement I2c at 20' using the active terminator, but the devices at this length are not being found (but are found at only 30 inches).

I have the data and clock lines running together as a twisted pair for 20' directly from the solder terminals on the active terminator.

Docs say that 100' should be possible... so it can't be the length...

Was it a mistake to use a twisted pair?

Thanks for your kind help.

SkyRyder
 
Posts: 45
Joined: Fri Mar 06, 2020 6:05 pm

Re: Active terminator I2C not working at 20'

by adafruit_support_bill on Wed Oct 20, 2021 6:47 pm

I would not twist the data and clock lines together. I'd use two pairs: One for GND and SDA and another for GND and SCL.

adafruit_support_bill
 
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Joined: Sat Feb 07, 2009 10:11 am

Re: Active terminator I2C not working at 20'

by SkyRyder on Wed Oct 20, 2021 7:18 pm

thank you!

SkyRyder
 
Posts: 45
Joined: Fri Mar 06, 2020 6:05 pm

Please be positive and constructive with your questions and comments.