> OK. I can understand that, and if they had 4 pins, I would
> have been even clearer. But with 3 pins (1 look as power and 1 as
> gnd), do they code/multiplex the two detectors in 1 signal on 1 pin ?

Very unlikely.  One pin is either power or ground.  One end of both
photodectors are tied to this pin.  The other two pins are the other ends
of each photodetector.  I seriously doubt you have both a power and ground
rail in the three pins.


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