PHD User Guide
11
3.3. PHD70 Inputs
The PHD70 does not support analog inputs.
The PHD70 has up to 8 digital inputs:
•
GPIO1
through
GPIO8
Digital inputs are typically used to read electrical signals from switches.
Depending on the PHD model, certain inputs can also be configured as inputs for the wake-up
functionality. On the PHD70 the wake options are, CAN, Touch and GPIO1 through GPIO8 can be used
as wake signals. Wake on GPIO9 and 10 is allowed on the PHD70 only if an encoder is not selected.
Note:
on the PHD70, wake on CAN will wake on CAN traffic on either CAN1 or CAN2.
Additionally, certain inputs can be configured as low power outputs. See section 3.4 for more
information.
The different configurations are done in software.
The PHD70 has 1 quadrature encoder input on
GPIO9
and
GPIO10
.
The encoder inputs are provided for the uses of a rotary encoder as an input device. The encoder states
must change 4 times per detent in the shaft rotation to be recognized by the PHD70, see chart below for
the required waveform.
Figure 3.2. X2 encoder waveform
X4 encoder waveform
3.3.1.
PHD28/PHD50 analog input capabilities
The PHD28 and PHD50 have analog inputs. These inputs are also configurable as digital inputs by
programming the voltage threshold in the Lua scripting tool to make them digital.
Analog inputs are useful for reading potentiometers and Hall Effect signals.
The following table provides specifications for the analog inputs:
Analog input specifications
Item
Min
Nom
Max
Unit
Input voltage range
0
5
V
Input pin capacitance
10
µF
Pull-down resistance
26.2
kΩ
Response to step change
50
ms
Over-voltage
36
V
Resolution - 10 bit
5
mV
Offset error
11
mV
Accuracy
3
%