Mini-Box M4 ATX-HV ATX power supply Installation guide

Below you will find brief information for ATX power supply M4 ATX-HV. The M4 ATX-HV is designed to work with a wide variety of main boards ranging from low power to fully fledged Intel, AMD or VIA motherboards. This PSU has been optimized to work in the high voltage range of 24-34V, offering a range of 6-34V.

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M4-ATX-HV
6-34V Intelligent ATX Power Supply
Installation Guide
Version 1.0e
P/N M4-ATX-HV-01
http://mini-box.com
Embedded PC Solutions
Before you start…
Please take a moment and read this manual before you install the M4-ATX-HV in
your
vehicle. Often times, rushing into installing the unit can result in serious damage
to your M4-ATX-HV 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-HV power sequencer / vehicle ATX power
supply.
The M4-ATX-HV was designed to work with a wide variety of main boards ranging
from low power to fully fledged Intel, AMD or VIA motherboards. This PSU has
been optimized to work in the high voltage range of 24-34V, offering a range of 634V.
M4-ATX-HV Logic Diagram
+
Battery
GND
PC
+
Reverse and
forward protection
Switch Logic
-
Ignition SW
6-34V DC-DC
ATX PSU
ATX power
Mother Board
ON/OFF switch
8bit MCU
Status LED
Amplifier
Enable
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M4-ATX-HV Connection diagram
Power Input Connectors (bottom, right)
Left
Battery negative (GND)
Center
Ignition (To start connect to Battery +).
Do not use in the standard PSU mode (mode P0)
Right Battery positive (+)
(A) ATX Power Output Connector 20/24 pin connector
(B) 12V-ATX power output connector 4 pin
(C) Configuration dip switches
(J5) For internal use only (do not use)
(J6) Amplifier THUMP wire harness (connects to the M4-ATX-HV pin header)
(J3) Fan Header. Positive pin is closest to “J3” marking.
(J8) USB, Motherboard ON/OFF and THUMP (Thump also available on J6)
1)
2)
3)
4)
5)
GND
GND
USB D+
USB DVcc
6) To Motherboard ON/OFF
7) To motherboard ON/OFF
8) Amplifier Thump
9) GND
19 N/C (key)
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J8 shown with cable harness
connected to the motherboard ON
OFF header (pin 7 and 6)
DIP Switch (ON=down)
1
2
3
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
P
P0
P1
P2
P3
P4
P5
P6
P7
Off-delay
(All rails ON)
Standard PSU mode
5sec + 1min AutoLatch*
1min + 1min AutoLatch*
1min + 1min AutoLatch*
15min
15min
30min
2hour
Hard-off
(5VSB)
1 min
NEVER
1min
1min
NEVER
1min
NEVER
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. Even with safety limits in place, your battery might be not be able to start
your engine. “Hard-off=NEVER keeps your 5VSB rail on at all times”
*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 away, M4-ATXHV 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 Auto Latch feature will be removed and system will shut down at as
governed by the “Off-delay” setting.
P0: In this mode, the M4-ATX-HV behaves like a regular ATX power supply. If J6 is
connected to the motherboard, M4-ATX-HV will also send a gratuitous “ON pulse”
to the motherboard right after power is first applied.
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 M4-ATX-HV consumes less than 0.5mA. This is our
recommended setting.
NOTE: Should you need to reset to factory defaults (in case changes were made
via the USB uplink), simply power off the unit, connect a jumper to JP1 and then
apply power back up for more than 2 seconds. The LED light will start to flash
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rapidly indicating that the factory defaults were loaded. Don’t forget to Remove
jumper! Disconnect M4-ATX-HV from battery for at least few seconds. You are
done!
Power challenges in a vehicle PC: 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 M4-ATX-HV is addressing these issues by cutting off the 5VSB rail after a predefined amount of time (see jumper chart, HARDOFF). During HARDOFF if the
battery level drops below 11.2V for more than one minute, M4-ATX-HV will shut
down and re-activate only when the input voltage is above 12V.
Engine Cranks, under-voltage and over-voltage situations. Another difficult
task is maintaining stable power to your PC. While car batteries are rated at 12V,
they actually provide voltages in between 8-16V (engine cranks) or as high as 80
volts (load dump). Most times, your battery will stay at 13.5V but extra precautions
need to take place in order to prevent such situations. M4-ATX-HV operates as low
as 6V and as high as 34V while providing strict regulation as well as input voltage
clamping and reverse protection.
Anti-Thump: If your PC is connected to your car amplifier, you will hear a loud pop
when the computer is first started. The M4-ATX-HV has an ‘anti-thump’ control that
will keep your amp OFF while the PC starts. Simply connect the 2 pin wire to J6
harness to your amplifier remote control pins. The pin at the edge of the PCB is
GND, inner pin is HOT.
Mode of operation explained
1) Ignition=OFF. Nothing happens. M4-ATX-HV is waiting for ignition signals.
2) Ignition=ON. M4-ATX-HV waits for few seconds then turns on the 5VSB rail.
After another second M4-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. M4-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
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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) M4-ATX-HV will go to step 1, if ignition is tuned ON again.
NOTE. When all dip switches are off, M4-ATX-HV acts as a regular power supply.
M4-ATX-HV will also send a gratuitous “ON” pulse (to the ON/OFF motherboard
pins, should you have a wire harness connected to it) when power is applied for the
first time. Do not connect the on/off switch if you don’t want your PC to be started
automatically.
M4-ATX-HV Characteristics
Minimum Input Operating. voltage
Maximum input Operating voltage
Deep-Discharge shutdown threshold
Input current limit (fuse protected)
Max Output Power
Deep Sleep Current Consumption.
Storage and operating temperature
MTBF
Efficiency (Input 10-16V)
Input connectors
Output Connector
6V
34V (clamping occurs at 36-38V range)
11.2V
Mini-blade 25A
220 Watts / 275 watts peak
&lt; 1.6mA
-40 to +125 degrees Celsius (storage), 40 – 65C (operating)
200,000 Hrs
&gt;94%, all rails combined, 50% load.
M4 screw terminal
ATX Power 24 pin (Molex P/N 39-012200)
*Unit shuts down when internal temperature sensor indicates &gt; 85C. This value can be changed with
software.
Maximum Power Characteristics
Output Rail
Current (Max)
5V
3.3V
5VSB
-12V
12V
12A
12A
1.5A
0.15A
10A (see below)
Current Peak
(&lt;30 seconds)
15A
15A
2A
0.2A
12A (see below)
Regulation
1.5%
1.5%
1.5%
10%
2%
When operating at &lt;8V or &gt;28V or extreme temperatures, de-rate by 30-50%, ventilation might be
required. When operating at constant 160watts or more forced ventilation is required.
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12V Rail Output Current (12V buck/boost converter)
Input (V)
12V out current
Input (V)
12V out current
6-8V
8A
11-16V
10A (12A peak)
8-11V
10A (12A peak)
16-34V
8A (10A peak)
Support and warranty: Standard Hardware Warranty 1Year / US, 2 Year EU.
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Key features

Wide input voltage range (6-34V)
Deep sleep current consumption < 1.6mA
Reverse and forward protection
Anti-thump control
Deep discharge shutdown
USB uplink for configuration
ATX power 24 pin connector

Frequently asked questions

The M4 ATX-HV operates as low as 6V and as high as 34V while providing strict regulation as well as input voltage clamping and reverse protection. It also has a deep discharge shutdown feature to prevent your battery from being drained completely.

The anti-thump feature prevents a loud pop from your car amplifier when the computer is first started. Simply connect the 2 pin wire to J6 harness to your amplifier remote control pins.

The M4 ATX-HV has multiple operating modes selectable via DIP switches. Each mode affects the power-on and power-off behavior, as well as the 5VSB rail behavior. The recommended mode (P1) sends an ON pulse to the motherboard when ignition is ON for more than 5 seconds and shuts down 5VSB after 60 seconds to conserve battery.