M2-ATX-HV
6-32V Intelligent Automotive ATX Power Supply
Installation Guide
Version 1.4 (firmware v1.5, 10/15/2009)
P/N M2-ATX-HV-02
Before you start…
Please take a moment and read this manual before you install the M2-ATX-HV-
HV in your vehicle. Often times, rushing into installing the unit can result in serious damage to your M2-ATX-HV-HV board, computer and probably your car’s electrical system.
The M2-ATX-HV-HV board has several wires that need to be installed in various places.
When installing, 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.
1.0 Introduction
Thank you for purchasing the M2-ATX-HV-HV power sequencer / vehicle ATX power supply.
The M2-ATX-HV-HV was designed to work with a wide variety of main boards such as the VIA C3/C7/nano motherboards as well as AMD, Pentium-M
Celeron or Core2Duo processors.
1.1 M2-ATX-HV-HV Logic Diagram
Battery
Ignition
Amplifier
Enable
+
GND
+
Reverse and forward protection
-
SW
J6
Switch Logic
8bit MCU
M2-
6-32V DC-DC
ATX PSU
J8
J9
PC
ATX power
MotherBoard
ON/OFF switch
J5
Optional On/OFF switch
LED
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1.2 M2-ATX-HV-HV Connection diagram
M2-ATX-HV-HV, top view
Power Input Connectors
J1 Battery + (un-switched battery, positive)
J3 Ignition (To start connect to Battery +). Do not use in the standard
PSU mode (mode P0).
J4 Battery - (negative)
Controls and Settings
J6 Controls amplifier via remote ON/OFF. Left pin is RMT, Right pin is
GND
J8
J10
J9
To motherboard ON/OFF switch
User jumper settings (A,B,C,D)
To external ON/OFF switch (optional, J8 is in parallel with J9)
Power Output Connectors
J2 Optional P4-12V power
J7
J5
ATX power connector (to motherboard)
To LED (optional)
Jumper attached=ON
IMPORTANT:
A B C D
OFF OFF OFF OFF
P
P0
Off-delay
(All rails ON)
Hard-off
(5VSB)
Standard PSU mode
Always use the
“Hibernate” feature, never use “Standby”
ON OFF OFF OFF
OFF ON
ON ON
OFF OFF
OFF OFF
P1
P2
P3
5s + 1min AutoLatch*
5s+ 1min AutoLatch*
5s+ 1min AutoLatch*
1 min
2 hour
NEVER as it can severely discharge your battery over extended periods of
OFF OFF ON OFF
P4 30s + 1min AutoLatch* 2 hour time.
ON
OFF ON ON OFF
ON
OFF ON
ON ON
OFF
OFF
P5 30s + 1min AutoLatch* NEVER
P6 30min
P7 3 hour
NEVER
NEVER
NEVER use “Hardoff = NEVER” settings unless you
OFF OFF OFF ON
P8 10 min 1 hour understand the risks of battery depletion.
ON OFF OFF ON
OFF ON OFF ON
P9 15 min
P10 1 hour
2 hours
75min
“Hard-off=NEVER always keeps 5VSB rail ON!
*AutoLatch is active during the fist 60s of PC operation (and only during the first 60 seconds). For example, If Ignition is turned ON and then OFF right
M2-ATX-HV-HV User Guide Page 2
http://www.mini-itx.com/store/ Mini-ITX.com away, M2-ATX-HV will latch Ignition in ON position for the next 60 seconds, allowing your operating system to fully come up. This will prevent disk drive corruption or systems that remain hung in the ON position. After the first 60 seconds of system operation, the AutoLatch feature will be removed and system will shut down at as governed by the “Off-delay” setting.
P0: In this mode, the M2-ATX-HV behaves like a regular ATX power supply. If
J6 is connected to the motherboard, M2-ATX-HV will also send a gratuitous
“ON pulse” to the motherboard right after power is first applied. If IGNITION is
connected to the battery, the unit will shut down if battery is < 11.2V. This is to protect the battery from over-discharging. If Ignition is not hooked up, M2-
ATX-HV will operate from as low as 6V. For more information, please consult the “UPS mode” documentation on the product page.
P1 (recommended): Sends ON pulse to motherboard when ignition is ON for more than 5 seconds, sends OFF pulse to motherboard 5 seconds after ignition is turned off. Waits another 60 seconds and then shuts down 5VSB to conserve battery. In this mode, the M2-ATX-HV consumes less than 0.5mA.
This is our recommended setting.
1.2 Power challenges in a Vehicle PC
The 5V Standby Problem: One of most difficult tasks of operating a PC in a vehicle is power consumption while the computer is OFF. Even when your computer is OFF or in Suspend, it will still consume about 50-150mA on the
5VSB rail. No matter how big your battery is, you will eventually drain it if proper actions are not taken.
The M2-ATX-HV is addressing these issues by cutting off the 5VSB rail after a pre-defined amount of time (see jumper chart, HARDOFF). When 5VSB is always active (HARDOFF=Never), M2-ATX-HV constantly monitors the battery levels. When battery level drops below 11V for more than one minute, M2-ATX-
HV will shut down and re-activate only when the input voltage is > 12V.
Engine Cranks, under-voltage and over-voltage situations. Another difficult task is maintaining stable 3.3V, 5V, 12V and -12V power to your PC. While car batteries are rated at 12V, they actually provide voltages in between 7-16V
(engine cranks) or as high as 80 volts (load dump). Most of the times, your battery will stay at 13.5V (while car is running) but extra precautions need to take place in order to prevent such situations. M2-ATX-HV can operate as low as 6V and as high as 28V while providing strict regulation on all rails along with input voltage clamping and reverse protection.
Loud amplifier pops when PC starts. If your PC is connected to your car amplifier, you will hear a loud pop when the computer is first started. The M2-
ATX-HV has an ‘anti-thump’ control that will keep your amp OFF while the PC starts. Simply connect J6 to your amplifier remote control pins to activate the
‘anti-thump’ feature.
M2-ATX-HV-HV User Guide Page 3
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2.0 Mode of operation
1)
2)
3)
4)
Ignition=OFF. Nothing happens. M2-ATX-HV is waiting for ignition signals.
Ignition=ON. M2-ATX-HV waits for few seconds then turns on the 5VSB rail. After another second M2-ATX-HV sends an “ON” signal to the motherboard via the 2 wires connected to the motherboard’s ON/OFF pins. The motherboard will turn ON and your system should start booting. The Ignition state will be latched for 60 more seconds so that the motherboard will have a change to come up in a clean manner.
Ignition=ON. Your computer will remain ON.
Ignition=OFF. M2-ATX-HV waits for “OFFDELAY” in seconds (see jumper chart) and then it turns the motherboard OFF by sending a signal to the motherboard’s ON/OFF switch. Your computer should turn off gracefully (shutdown procedure). After shutdown, 5VSB will still be provided for another “HARDOFF” seconds. In the event where the shutdown process is longer than “HARDOFF” (Operating System gets frozen, etc), power will be shut down hard, turning off all power rails. During the HARDOFF procedure, the battery levels will be constantly monitored to prevent deep discharge situations.
5) M2-ATX-HV will go to step 1, if ignition is tuned ON again.
3.0 M2-ATX-HV-HV Characteristics
Minimum Input Operating. voltage 6V
Maximum input Operating voltage 32V
Input current limit (fuse protected) 15A (15A mini-blade fuse)
Max Output Power
Operating temperature
Storage temperature
MTBF
140 Watts
-40 to +85* degrees Celsius
-55 to +125 degrees Celsius
100,000 hrs @ 50C
Efficiency (Input 9-16V)
PCB size
>93%, all rails combined, 50% load.
160x45mm
Input connectors Faston 0.25” terminal
Output Connector ATX Power 20 pin (Molex P/N 39-01-2200
Operating at temperatures above 85C / 185F will drastically reduce the MTBF. When operating at high temperatures or fanless operation, must reduce PSU load by ~25%.
99
96
93
90
87
84
81
78
Iout = 5A
Iout = 6A
Iout = 8A
75
6 8 10 12
Vin (V)
14 16 18
Maximum Power Characteristics
Output Rail Current (Max) Current Peak
(<60 seconds)
5V
3.3V
5VSB
-12V
6A
6A
1.5A
0.15A
8A
8A
2A
0.2A
Regulation
1.5%
1.5%
1.5%
5-%
12V 7A* (see below) 8A 2%
When operating at >24V or extreme temperatures, ventilation will be required.
M2-ATX-HV-HV User Guide Page 4
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12V Rail Output Current
Input (V) 12V rail current Input (V) 12V rail current
6V
7V
8V
9V
3A
4A
6A
7A
11V
12V
14V
14-18V
7A
7A
8A
7A
10V 7A 20-32V 6A
For input voltage (6-10V or 20-32v) ventilation might be required for peak load .
M2-ATX-HV-HV User Guide Page 5