Hi all,

Few days ago I ran across an interesting liquid level switch IC made by ST Microelectronics. The part # is L4620. This is a 8 pin dip device which, according to the specs, can safely detect the presence or absence of a liquid between two electrodes.
It also has few nice configuration options, built in delay and alarm latch.
I found it at All Electronics, the electronics surplus distributor.
They also provide a link to a data sheet (http://www.allelectronics.com/spec/L4620.pdf). Unfortunately the data sheet is a bit unclear on the RC network associated with the sensor (Ra, Rb, Rc, Ca, Cb, Cc).
I Google it but I was unable to find any more information. What is strange is even ST Microelectronics site does not give any hits on the device made by them.
Trying to call the few places listed on the site did not help, not to mention that one phone # is disconnected.

So, my problem is finding some more info on how to design the sensor RC network to get the chip going.

Did anyone use this chip or does anyone have more info on how to use it?
It looks like a pretty good chip for only $0.50 in low quantities and it can make a really small, reliable, sealed sensor for all kind of home or automotive applications.

Any info in this matter will be greatly appreciated.

Best Regards,

Nick