Parker PHD Series, User Manual, Page: 21 / 45

PHD User Guide
14
• The power provided to the digital switch connected to the input must be provided through a fuse in
the wire harness.
A typical active-high digital input connection is shown below:
Internal to product
Active High
Digital Input
Battery
Application Switch
Figure 3.5. Active-high digital input
3.3.3. PHD50 frequency input capabilities
The PHD50 has 1 frequency input on
GPIO9
that can be configured as FIN or GPIO. The frequency input
is ideal for use with hall-effect type sensors.
The following table provides specifications for the frequency input:
Frequency input specifications
Item Min Nom Max Unit
Input range 0 5 32 V
Negative threshold 1.545 V
Positive threshold 4.008 V
Input capacitance at pin 0.1 µF
Over-voltage 36 V
Frequency accuracy 3 %
Frequency range (see note) 0 15000 Hz
Pull-up resistor to min 4.3V, max 5V 1.2 kΩ
Pull-down resistor 26.2 kΩ
Note:
Electrically signals to 0 are possible, but the software will limit the minimum
measurable frequency
3.3.3.1. DC-Coupled Frequency Input Connections
When connecting DC-coupled frequency inputs, be aware of system noise and ground level shift.
System Noise