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om, Embedded PC Solutions
2)
Ignition=ON. M3-ATX waits for 2-3 seconds then turns on the 5Vsb rail. After another second M3-ATX 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.
3)
Ignition=ON. Your computer will remain ON.
4)
Ignition=OFF. M3-ATX 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,
5)
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.
6)
M3-ATX will go to step 1, if ignition is tuned ON again.
NOTE
. When all config. jumpers are removed, M3-ATX acts as a regular power supply, no ignition timing, no
HARDOFF. M3-ATX will send a gratuitous “ON” pulse to the M/B 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.
Troubleshooting
a)
Motherboard is not turning ON:
Check input cables.Make sure you have a a well
tighten wire harness. Measure the un-switched pin (red). You should see 12V (car on) or
0V (car off). NOTE: In P1, P2, P3 modes if V(In) is < 12V, the M3-ATX will not start.
b
) Motherboard is not turning ON (cont)
: Ensure total system power consumption
does not exceed the M3-ATX specifications.
c) Motherboard is not turning ON (cont).
Make sure that the ON/OFF wire harness
from the M3-ATX is connected to the ON/OFF switch of your M/B.
M3-ATX Characteristics
Minimum Input Operating. voltage
6V
Maximum input Operating voltage
24V (clamping will occur at 25-27V)
Deep-Discharge shutdown threshold
11.2V
Input current limit (fuse protected)
15A
Max Output Power
125 Watts (8-16V, see chart below)
Deep Sleep Current Consumption.
< 0.5mA
Storage and operating temperature
-55 to +125 degrees Celsius (storage), -40 – 65C (operating)
MTBF
150,000 hrs @ 50C, 96,000 hrs @65C
Efficiency (Input 9-16V)
>94%, all rails combined, 50% load.
Input connectors
Faston 0.25” terminal
Output Connector
ATX Power 20 pin (Molex P/N 39-01-2200)
*Units starts failing at >125 Celsius. Operating at temperatures above 85C / 185F will drastically reduce the MTBF.
Maximum Power Characteristics
Output Rail
Current (Max)
Current Peak
(<30 seconds)
Regulation
5V
6A
8A
1.5%
3.3V
6A
8A
1.5%
M3-ATX User Guide Page 4
