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Hi, I think you may run out of inputs on a single LTC2986. I would recommend downloading the evaluation software from the analog.com site and running the configuration designer to see if what you're planning is feasible.

I'll have to wait until later when I'm near my dev computer.  Maybe a simple question, but are both of the K-type wires needing to be connected to individual channels? ...or can one side of each of the 6 K sensors be tied to one channel?   With RTD's I've tied on side of those to 5v and then measured each separately on the 328p.

Andy,

Don't mean to hijack this post, but I've starting planning a similar project and wanted to ask if you would have time to provide feedback?  More than happy to start a new post if you want.  Here's a quick summary of what I'm looking to do:

>Inputs: (6) K-type inputs and (2) 2-wire RTD
>SDI output goes to ESP32 running Ardunio IDE
>ESP32 outputs to TFT 320x240 display

Right now, I have a working version for just the 2 RTDs (and a few digital pressure sensors) with an Atmega328p and TFT display.  This project will add the k-types and a larger display. I've already successfully ported the code over for the display, etc. and am now working the inputs.

My first question is if you think the LTC2986 is an appropriate choice for obtaining input from the 8 (6+2) sensors and sending this to the ESP32 in via the SPI connections?

Thanks for your time in reading this.
Cheers,