TMP422: Rs and Cdiff in basic connections

Hi Chris,

Thank you for your post. 

Chris Zhao1 said:

1) Why do I need to add them? In case I didn't add them, can TMP422 still work?

You don't necessarily need them, and they are optional to include, The combination of Cdiff and Rs just provide some noise filtering. We do not always use these on our EVMs for example, but we have the footprints there for these components in case additional filtering is needed. I would recommend taking this approach.

Chris Zhao1 said:

2) Can I just add one Cdiff? 

You could do this if you were worried that one line would be noisier than the other, but I would suggest placing footprints for Cdiff on both lines. Then you can populate them if needed.

Chris Zhao1 said:

3) For the placement, where should Rs and Cdiff should be placed, close to TMP422 or the transistor?

We typically recommend placing these closer to the TMP422.

Please let me know if you have any additional questions.

Best Regards,
Brandon Fisher