Cartft M3-ATX Installation Manual

GND

+

Switch Logic 6-24V DC-DC

ATX PSU

PC ATX

power

Mother Board
ON/OFF

M1-

Battery

Ignition SW

-

+

6

Serial ctlr 4

2

8bit MCU

Amplifier
Enable

8

Reverse and

forward protection

Status LED

M3-ATX

6-24V Intelligent ATX Power Supply

Installation Guide

Version 1.0b

P/N M3-ATX-01

Before you start…

Please take a moment and read this manual before you install the M3-ATX in your
vehicle. Often times, rushing into installing the unit can result in serious damage
to your M3-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 M3-ATX power sequencer / vehicle ATX power supply.

The M3-ATX was designed to work with a wide variety of main boards such as the VIA
mini-ITX motherboards as well as Pentium-M / Celeron or full power Pentium systems.

M3-ATX Logic Diagram

http://www.cartft.com, Embedded PC Solutions

1.2 M3-ATX Connection diagram

Power Input Connectors (right side)
Red Battery + (positeive, un-switched battery)
Black Battery - (negative)
White Ignition (switched battery, positive. Can test by connecting it to Battery +)

Power Output Connectors (left side)

Hard drive wire harness (HDD, SATA-HDD, Floppy)

ON/OFF and THUMP wire harness (connects to M3-ATX pin header)

-ON/OFF wire harness (red/back) to connect to motherboard’s ON/OFF pin headers.

-THUMP (white) to connect to amplifier remote ON/OFF connector.

Wire harness for motherboard ON/OFF
switch and Thump control (optional)

Wire harness for serial connection.

IMPORTANT: Always use the “Hibernate” feature on your PC, never use “Standby”.

P0: In this mode, the M3-ATX behaves like a regular ATX power supply.

P1: Sends ON pulse to motherboard when ignition is ON for more than 2 seconds,

sends OFF pulse to motherboard 5 seconds after ignition is turned off. Waits another 1

M3-ATX User Guide Page 2

P Off-delay Hard-off
P0

Standard PSU mode

P1

5sec 1 min

P2

1 min 5 min

P3

30 min 2 hour

P4

custom custom