ARB Pressure Control Module, 181002A, ECU specification Overview The ARB Pressure Control Module (PCM) is a system for controlling the ARB Pressure Regulating Valve (PRV) and an ARB Compressor, mostly for the purpose of tyre inflation and deflation. The system is composed of two parts: an electronic control unit (ECU), and a smart phone app. The ECU will control the compressor and the PRV with wired connections to achieve a target pressure, while the smart phone app will provide the user with a graphical interface to perform functions like turn the compressor on and off, set the target pressure, and display a live pressure readout. The communication between the smart phone app and the ECU is Bluetooth. The ARB Air Suspension Control Module (ASCM) is a system for controlling vehicle air suspension pressure through the ARB Pressure Regulating Valve (PRV) and ARB Air Suspension Isolating Valves. The system is composed of two parts: an electronic control unit (ECU), and a smart phone app. Using wires connected, the ECU will activate the isolating valves to select the air suspension component and control the PRV to achieve a target pressure. While the smart phone app will provide the user with a graphical interface to perform functions like setting the target pressures, and displaying a live pressure and voltage readout. The communication between the smart phone app and the ECU is via Bluetooth Low Energy (BLE). Scope This covers the design of the ARB Pressure Control Module ECU and gives specific technical requirements and implementation details. Electrical General Specifications This covers the electrical specifications that apply to the unit as a whole. Item Input battery voltage range Load dump Cranking voltage Specification 12VDC for normal operation Load dump tolerant Crank voltage of 6VDC for 1 second with no reset to the MCU. Tablet and output load dropout is acceptable. The system is tolerant of a reversed battery for a period of 1 minute. Load activation during reversed battery is allowable. All inputs and outputs shall not be damaged by either short circuit to battery or ground with the exception being ground pins being shorted to battery. There is no requirement for a specific quiescent current. Reversed battery Short Circuit Quiescent current Loose battery terminals Fusing Battery connections Total current Momentary interruption in power supply
(loose battery terminal). The module shall not reset for battery dropouts less than 50ms no more frequent than every 2 seconds. The unit is not fused. It relies on upstream fusing. 6.3mm spade terminals
<2A Digital Outputs Item Output count Load maximum power Load inductive energy Inrush current handling Fault diagnostics Short circuit handling Short to battery Specification 3 5W per output 6mJ maximum It is assumed that the outputs primarily drive relays. Not required Not required Tolerant of short circuit to ground This can back feed through and power the unit Analogue Input (pressure transducer) Item Analogue input count Analogue input range Analogue input power feed Dedicated 5V power pin Dedicated ground pin Specification 1 0-5VDC 0.5A maximum 1 1 Communications Item RF Environment Item Temperature range Water proofing Conformal coating Enclosure EMC susceptibility Specification Bluetooth V4.0 compliant, SSP profile, client/slave Specification
-20C to +85C IP65 yes Custom plastic injected moulding Automotive transients present on power supply, inputs and Certifications Item Bluetooth module EMC Material Item SoC compliant NOTE:
Specification Must have type test and on board antenna RCM, CE and FCC for sales in Australia, Europe, North and South America, Middle East, Africa Specification Must comply to RoHS, ARB specification S01-
106 This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
-- Reorient or relocate the receiving antenna.
-- Increase the separation between the equipment and receiver.
-- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
-- Consult the dealer or an experienced radio/TV technician for help. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undersired operation. FCC Caution: You are cautioned that changes or modifications not expressly approved by the party responsible for compliance could void your authority to operate the equipment.