PiXtend V2 -L- Hardware Manual
If larger voltages are applied to the input, the current flow increases rapidly over the
permitted range and is limited at approx. 100 - 150 mA by a self-resetting fuse.
Even if such defects are avoided, it is not recommended to let the input currents rise
permanently or in normal operation above 20 mA.
Currents greater than 20.5 mA can not be evaluated in the software.
The ground connectios (GND) of external power supplies must be connected directly to
the GND terminals on the terminal strips of the analog inputs.
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