The PHD has digital, frequency, and analog inputs.
Damage to equipment! Do not connect inputs directly to unprotected
inductive loads such as solenoids or relay coils, as these can produce
high voltage spikes that may damage the PHD. If an inductive load must
be connected to an input, use a protective diode or transorb.
3.1. PHD28 inputs
The PHD28 has up to 7 analog inputs:
▪ GPIO1 through GPIO7
Analog inputs are typically used to read electrical signals that span a voltage
range.
Analog inputs GPIO1 through GPIO7 can also be configured as digital inputs with
wake-up functionality.
Additionally, all inputs can be configured as low power outputs. See section 3.4
for more information.
The different configurations are done in software.
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