Ethernet to I2C Converter pull ups

Hardware
1

I am working with the Ethernet to I2C Converter board, how to define the Pull ups on the sda & scl? currently the SCL=0v
it is written:
“I2C is an Open Collector Protocol. As such, all data is transferred using open collector communications, not standard TTL signals. In order to speak to an Open Collector device, the Pull Up/Down Jumper on the AD8 Port 1 MUST be set to the UP position. This will pull up the SDA and SCL lines using a 10K resistor, which is within I2C specifications. Note that communication errors will result unless this jumper is properly set.”
Where is AD8 Port1 located? How to set it to up position?

2

Hi @arielc This is a hardware master I2C device, so it has the pull-up resistors enabled. In this case, you do not need to enable the pull-up resistors on the client devices.

The general diagram should resemble something like this:

1024×450 21 KB

(Pull-up resistors are already included in the master device (Ethernet to I2C))

Take a look and feel free to let us know if you have any questions

Thank you,
Eduardo M.

3

Just to verify, the Pull ups are set buy default in this circuit?
Currently when connected the SCL shows 0v , what can be the reason for that?

Thanks.
Ariel

4

Hi @arielc Yes, the 4.7K Pull-Up Resistors are Included on this converter.

image
image622×654 97.7 KB

You can find the Mechanical Drawing and Wiring Diagrams under the ‘Drawings’ tab on the product page.

Thanks,
Eduardo M.

5
  • I know that I have the pull-up resistor on board, for some reason, when measure with DVM I see “0” on SCL, also in your application, I cant find the device, in SDA I see “1” in DVM.