Hello,
The LMP91000 is a nice chip (and even has internal temp sensor which is very handy for EC cells) but it's designed for 3-terminal EC cells.
However, our application requires more precise measurements and we are trying to use the new 4-terminal EC gas sensors. The 4th terminal is an auxiliary electrode which corrects for voltage drift:
http://alphasense.com/alphasense_sensors/B4_sensors.html
for example: http://alphasense.com/pdf/COB4.pdf
Has anybody successfully used the LMP91000 with a 4-terminal cell?
We are currently planning to just connect the 3 standard electrodes to the LMP91000 and then just run the 4th auxilliary electrode directly into the ADC on our microcontroller, so we can do a correction in firmware; but if there is a better way to do it, we would be interested to hear from other research folks.
thanks,
-RF
TagSense, Inc.