Carl:
What a unique chip. I'll have to spend some time looking over the 36 pages of data.
Can you think of some ways to do resistance simulation in general?
In any event, short circuit current and open circuit voltage (pot disconnected) would be the first terms to know and whether or not what is to be simulated is 2 terminal or three.
I have a project that I'd like to do which is similar to the OP's and occaisionally I see people wanting to change resistance control to a 0-5V or some such signal.
The OP would still have to do the same. Convert an analog voltage to a resistance. In the OP's case, it's probably linear. We also don't know if its part of a gain block or whatever. I know you can buy motorized potentiometers that can use process signals to move it.
If your working with a control signal, you might be able to:
Sink a current with a FET until the voltage is X for each pair.
If the OP's pot is used in a gain block, it might be tougher substituting anything.
In a project I would like to do and you might think I'm crazy is to: substitute one thermister probe for another. I think the thermister is about 5-10K at 25 degrees F and I think the voltage applied is close to 5V. There is a micro switch that's activated when the probe is inserted. I don't have the schematic of the device. It's a microwave. I have to fix the convection/microwave first without a schematic. I just love the old thing. Somewhere I have the curve of the bad thermister. That's lost too.
So, I was thinking of using a high or low side current sensing IC and a FET to sink current. And to use a processor to read the new sensor and convert it to the new resistance.
It's limited range, like 115 to 200 F or so. I would like to be able to lower the limit too as well even if it is rarely. I need about 90F minimum for proofing yeast. Something I don't do often.
I just haven't done any measurements or experiments to figure out what I need to do.
---OP---
The OP's problem may be similar.
For the OP:
1. Is the potentiometer 2 or 3 wires?
2. What is the open circuit voltage?
3. What is the short circuit current?
4. Is there a relationship between the angular position and the terminal voltage?
5. Minimum? Maximum?
6. What's available to power the interface circuit?
67K is an ODD value.