mini-box M2-ATX-01 User manual

GND
+ Switch Logic 6-30V DC-DC
ATX PSU
PC ATX
power
MotherBoard
ON/OFF switch
M1-
Battery
Ig itio
-
SW
+
J86
LED
J54
J62
8bit MCU
Amplifier
E able
J98
Reverse nd
forw rd protection
Optio al O /OFF switch
M2-ATX
6-24V Intelligent Automotive ATX Power Supply
I stallatio Guide
Version 1.0
P/N M2-ATX-01
Before you start…
Ple se t ke moment nd re d this m nu l before you inst ll the M2-ATX in your
vehicle. Often times, rushing into inst lling the unit c n result in serious d m ge
to your M2-ATX bo rd, computer nd prob bly your c r’s electric l system.
The M2-ATX bo rd h s sever l wires th t need to be inst lled in v rious pl ces.
When inst lling, always double check the polarity of your wires with voltmeter.
Avoid using the cig rette plug s power source, often times the cont cts re not
c p ble of delivering high current to your PC.
1.0 I troductio
Th nk you for purch sing the M2-ATX power sequencer / vehicle ATX power supply.
The M2-ATX w s designed to work with wide v riety of m in bo rds such s the VIA
mini-ITX motherbo rds s well s Pentium-M Celeron or full power P4 systems.
1.1 M2-ATX Logic Diagram

1.2 M2-ATX Co ectio diagram
M2-ATX, top view
Power I put Co ectors
J1 B ttery + (un-switched b ttery, positive)
J3 Ignition (switched b ttery, positive. C n test by connecting it to B ttery +)
J4 B ttery - (neg tive)
Co trols a d Setti gs
J6 Controls mplifier vi remote ON/OFF. Left pin is RMT, Right pin is GND
J8 To motherbo rd ON/OFF switch
J10 User jumper settings (A,B,C,D)
J9 To extern l ON/OFF switch (option l, J8 is in p r llel with J9)
Power Output Co ectors
J2 Option l P4-12V power
J7 ATX power connector (to motherbo rd)
J5 To LED (option l)
NOTE: “If HARDOFF is set to “never”, M2-ATX will utom tic lly
shut down when b ttery volt ge is below 11.2V for more th n 1
minute in order to prevent ‘deep disch rge’ situ tions.
Mode “0” is regul r ATX power supply mode, no power sequencing
provided, c n be used for non vehicle pplic tions.
Avoid using HARDOFF = Never, c n severely disch rge your
b ttery if PC. Suggested modes re: 1, 2, nd 4.
1.2 Power challe ges i a Vehicle PC
The 5V Sta dby Problem: One of most difficult t sks of oper ting PC in vehicle is
power consumption while the computer is OFF. Even when your computer is OFF, it will
still consume bout 100mA on the 5V r il. All power supplies provide 5VSB (5V st ndby)
so th t the motherbo rd c n issue t le st PSON sign l. When the computer is in the
suspend mode, it will consume even more power, bec use the RAM needs to be
powered t ll times.
No matter how big your battery is, it will eventually drain your battery in a matter of days.
M2-ATX User Guide P ge 2

The M2-ATX is ddressing these issues by cutting off the 5VSB r il fter pre-defined
mount of time (see jumper ch rt, HARDOFF). When 5VSB is lw ys ctive
(HARDOFF=Never), M2-ATX const ntly monitors the b ttery levels. When b ttery level
drops below 11V for more th n one minute, M2-ATX will shut down nd re- ctiv te only
when the input volt ge is > 11V.
E gi e Cra ks, u der-voltage a d over-voltage situatio s. Another difficult t sk is
m int ining st ble 3.3V, 5V, 12V nd -12V power to your PC. While c r b tteries re
r ted t 12V, they ctu lly provide volt ges in between 7-11V (engine cr nks) or s high
s 80 volts (lo d dump). Most of the times, your b ttery will st y t 13.5V (while c r is
running) but extr prec utions need to t ke pl ce in order to prevent such situ tions. M2-
ATX c n oper te s low s 6V nd s high s 28V while providing strict regul tion on ll
r ils long with input volt ge cl mping nd reverse protection.
Loud amplifier pops whe PC starts. If your PC is connected to your c r mplifier, you
will he r loud pop when the computer is first st rted. The M2-ATX h s n ‘ nti-thump’
control th t will keep your mp OFF while the PC st rts. Simply connect J6 to your
mplifier remote control pins to ctiv te the ‘ nti-thump’ fe ture.
2.0 Mode of operatio
The M2-ATX performs sever l timing routines nd t kes ctions s follows:
(NOTE: When ll config jumpers re removed, M2-ATX will be in the “dumb PSU mode”,
no ignition timing, no HARDOFF. M2-ATX will send gr tuitous “ON” pulse to the M/B
when power is pplied for the first time. Do not connect J8/J9 to the M/B on/off switch if
you don’t w nt your PC to be st rted utom tic lly.
1) Ignition=OFF. Nothing h ppens. M2-ATX is w iting for ignition sign ls.
2) Ignition=ON. M2-ATX w its for 2-3 seconds then turns on the 5Vsb r il. After nother second M2-ATX
sends n “ON” sign l to the motherbo rd vi the 2 wires connected to the motherbo rd’s ON/OFF pins.
The motherbo rd will turn ON nd your system should st rt booting.
3) Ignition=ON during driving. Your computer will rem in ON.
4) Ignition=OFF. M2-ATX w its for “OFFDELAY” in seconds (see jumper ch rt on P ge 2) nd then it turns
the motherbo rd OFF by sending sign l to the motherbo rd’s ON/OFF switch. Your computer should
turn off gr cefully (shutdown procedure). During this time, power will still be v il ble for your PC to
perform shutdown.
5) 5VSB will still be provided for nother “HARDOFF” seconds (see jumper ch rt). In the event where the
shutdown process is longer th n “OFFDELAY” (windows gets frozen, etc), power will be shut down h rd,
turning off ll power r ils. If “HARDOFF” is set to ‘NEVER”, the PSU will lw ys provide 5VSB, therefore
the PC c n lso be used in the SLEEP mode. During the HARDOFF procedure, the b ttery levels will be
const ntly monitored to prevent deep disch rge situ tions.
6) M2-ATX will go to step 1, if ignition is tuned ON g in.
3.0 Troubleshooti g
) Motherbo rd is not turning ON.
M2-ATX User Guide P ge 3

Check input c bles. Me sure volt ge on the un-switched 12V. You should get bout 12V. Me sure the un-switched pin
(red) while turning the c r ON/OFF. You should see 12V (c r on) or 0V (c r off).
b) Motherbo rd is not turning ON (cont).
Check your output c bles. Ensure tot l system power consumption does not exceed the M2-ATX specific tions.
c) Motherbo rd is not turning ON (cont).
M ke sure th t either J8 or J9 is properly connected to the ON/OFF switch of your M/B.
4.0 M2-ATX Characteristics
Minimum Input Oper ting. volt ge 6V
M ximum input Oper ting volt ge 24V (cl mping will occur t 25-27V)
Deep-Disch rge shutdown threshold 11.2V
Input current limit (fuse protected) 15A (15A mini-bl de fuse)
M x Output Power 160 W tts
Oper ting temper ture -40 to +85* degrees Celsius
Stor ge temper ture -55 to +125 degrees Celsius
MTBF 192,000 hrs @ 50C, 96,000 hrs @65C
Efficiency (Input 9-16V) >94%, ll r ils combined, 50% lo d.
PCB size 160x45mm
Input connectors F ston 0.25” termin l
Output Connector ATX Power 20 pin (Molex P/N 39-01-2200)
*Units st rts f iling t ~115 Celsius. Oper ting t temper tures bove 85C / 185F will dr stic lly reduce the MTBF. When oper ting t high
temper tures or f nless oper tion, must reduce PSU lo d by 25%.
75
78
81
84
87
90
93
96
99
6 8 10 12 14 16 18
Vi (V)
12V rail Efficie cy (%)
Iout = 5A
Iout = 6A
Iout = 8A
Maximum Power Characteristics
Output R il Current (M x) Current Pe k
(<60 seconds)
Regul tion
5V 8A 12A 1.5%
3.3V 8A 12A 1.5%
5VSB 1.5A 2A 1.5%
-12V 0.15A 0.2A 5-%
12V 8A* (see below) 9A 2%
Tot l power = 169.9 W tts
M2-ATX User Guide P ge 4

When oper ting t 24V or extreme temper tures, de-r te by 25%, ventil tion will be required.
12V Rail Output Curre t
Input (V) 12V r il current Input (V) 12V r il current
6V 4A 11V 8A
7V 5A 12V 8A
8V 6A 14V 8.5A
9V 7A 14-18V 9A
10V 8A 20-26V 7A
For low input volt ge (6-10V) ventil tion might be required for pe k lo d
M2-ATX User Guide P ge 5