Spectra M2-ATX-HV User manual

GND
+
Switch Logic
6
-
3
2
V
DC
-
DC
ATX PSU
PC
ATX power
MotherBoard
ON/OFF switch
M2
-
Battery
Ignition
-
SW
+
J
8
LED
J
5
J
6
8bit MCU
Amplifier
Enable
J
9
Reverse and
forward protection
Optional On/OFF switch
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

M2-ATX-HV-HV User Guide Page 2
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 To motherboard ON/OFF switch
J10 User jumper settings (A,B,C,D)
J9 To external ON/OFF switch (optional, J8 is in parallel with J9)
Power Output Connectors
J2 Optional P4-12V power
J7 ATX power connector (to motherboard)
J5 To LED (optional)
IMPORTANT:
Always use the
“Hibernate” feature,
never use “Standby”
as it can severely
discharge your
battery over
extended periods of
time.
NEVER use “Hard-
off = NEVER”
settings unless you
understand the risks
of battery depletion.
“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
Jumper attached=ON
A B C D P Off-delay
(All rails ON)
Hard-off
(5VSB)
OFF OFF OFF OFF P0 Standard PSU mode
ON OFF OFF OFF P1 5s + 1min AutoLatch* 1 min
OFF ON OFF OFF P2 5s+ 1min AutoLatch* 2 hour
ON ON OFF OFF P3 5s+ 1min AutoLatch* NEVER
OFF OFF ON OFF P4 30s + 1min AutoLatch* 2 hour
ON OFF ON OFF P5 30s + 1min AutoLatch* NEVER
OFF ON ON OFF P6 30min NEVER
ON ON ON OFF P7 3 hour NEVER
OFF OFF OFF ON P8 10 min 1 hour
ON OFF OFF ON P9 15 min 2 hours
OFF ON OFF ON P10 1 hour 75min

M2-ATX-HV-HV User Guide Page 3
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 4
75
78
81
84
87
90
93
96
99
6 8 10 12 14 16 18
Vin (V)
12V rail Efficiency (%)
Iout = 5A
Iout = 6A
Iout = 8A
2.0 Mode of operation
1) Ignition=OFF. Nothing happens. M2-ATX-HV is waiting for ignition signals.
2) 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.
3) Ignition=ON. Your computer will remain ON.
4) 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 140 Watts
Operating temperature -40 to +85* degrees Celsius
Storage temperature -55 to +125 degrees Celsius
MTBF 100,000 hrs @ 50C
Efficiency (Input 9-16V) >93%, all rails combined, 50% load.
PCB size 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%.
Maximum Power Characteristics
Output Rail Current (Max) Current Peak
(<60 seconds)
Regulation
5V 6A 8A 1.5%
3.3V 6A 8A 1.5%
5VSB 1.5A 2A 1.5%
-12V 0.15A 0.2A 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 5
12V Rail Output Current
Input (V) 12V rail current Input (V) 12V rail current
6V 3A 11V 7A
7V 4A 12V 7A
8V 6A 14V 8A
9V 7A 14-18V 7A
10V 7A 20-32V 6A
For input voltage (6-10V or 20-32v) ventilation might be required for peak load.