Section 80
00-02-0829
2018-02-26
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3 -
1 Introduction
1.1 Overview
Murphy’s Intelligent Xpansion™ Power Distribution Module (PDM) expands CAN bus networks
and replaces existing fuse and relay boxes with more reliable, solid-state switches that can
directly drive lights, cooling fans, wiper motors and directional DC motors.
Each of the 12 PDM outputs can switch or proportionally drive 15A loads and feature built-in
over-current detection and shutdown capability. Outputs can be paired to run up to six electric
motors with H-bridge direction control.
Twelve digital inputs monitor switched battery, ground and floating inputs. Additionally, eight
analog inputs are available with a 5V sensor supply.
Wiring length is reduced and costs are cut by remotely locating the PDM module near signals
and loads. Then the I/O is multiplexed using a CAN bus network, which allows engineers to
greatly simplify harness design for ease of installation and improved reliability.
For applications not requiring a CAN bus, the inputs can directly trigger outputs so there is no
need for a separate microcontroller.
The enclosure is fully sealed and potted to withstand wash-down and dust.
The unit is compact and can be mounted nearly anywhere on a vehicle.
The PDM is an advanced CAN-based I/O module with built-in fault detection for directly driving
high current loads such as work lights, DC motors and actuators, wiper motors and many other
loads. It allows for the flexible I/O extension of CAN bus systems using the SAE J1939
protocol or stand-alone operation replacing traditional switch-activated fuse and relay boxes.
