mini-box M4-ATX - User Manual

GND
+
Switch Logic 6-30V DC-DC
ATX PSU
PC ATX
power
Mother Board
ON/OFF
switch
M4-ATX
Battery
Ignition SW
-
+
USB
8bit MCU
Amplifier
Enable
Reverse and
forward protection
Status LED
M4-ATX
6-30V Intelligent ATX Power Supply
Installation Guide
Version 1.0c
P/N M4-ATX-01
Before you start…
Please take a moment and read this manual before you install the M4-ATX in your
vehicle. Often times, rushing into installing the unit can result in serious damage
to your M4-ATX board, computer and probably your car’s electrical system. Always
double check the polarity of your wires with a voltmeter.
Avoid using the cigarette plug as a power source, often times the contacts are not
capable of delivering high current to your PC.
Introduction
Thank you for purchasing the M4-ATX power sequencer / vehicle ATX power supply.
The M4-ATX was designed to work with a wide variety of main boards ranging from low
power to fully fledged Intel, AMD or VIA models .
M4-ATX Logic Diagram

Summary

Installation Guide

Before you start...

Essential preliminary steps and warnings before installing the M4-ATX unit.

Introduction

Welcome and overview of the M4-ATX power sequencer and its capabilities.

M4-ATX Connection Diagram

Power Input Connectors

Explanation of the left, center, and right power input connector functions.

Connector Identification

Details on ATX Output, 12V-ATX, Configuration Dip Switch, and other connectors (J5, J6, J3, J8).

DIP Switch Settings

DIP Switch Configuration Options

Table detailing DIP switch settings for Off-delay and Hard-off modes.

Recommended Settings

Guidance on recommended DIP switch settings (P1) for optimal operation.

Power Management and Operation

Vehicle PC Power Challenges

Addressing power consumption issues and strategies for vehicle PC operation.

Engine Cranks and Voltage Variations

Handling voltage fluctuations during engine cranks and other vehicle events.

Mode of Operation

Anti-Thump Control

How to connect the M4-ATX to prevent loud pops from car amplifiers.

Ignition Control Sequence

Step-by-step explanation of M4-ATX behavior based on ignition signals.

M4-ATX Characteristics

Technical Specifications

Key electrical and operational specifications of the M4-ATX unit.

Maximum Power Characteristics

Detailed output rail current and regulation specifications.

mini-box M4-ATX Specifications

General

Output Power	250W
Output Voltage Rails	+3.3V, +5V, +12V, -12V
Input Voltage	6V to 30V DC
Cooling	Passive (heatsink)
Connectors	24-pin ATX, 4-pin CPU, SATA, Molex
Protection Features	Overvoltage, undervoltage, overcurrent, short circuit