CarNetix PSU-PC19 DC User manual

CarNetix PSU-PC19 V2.0 Installation Manual
CarNetix PSU-PC19 DC-DC Power Supply
Installation and Operation of the PSU-PC19 with the Xenarc SC8
Version 1.0
(applies to Version 2.0+ hardware)
February 1, 2006
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CarNetix PSU-PC19 V2.0 Installation Manual
Table of Contents
1.0 PSU-PC19 Introduction..................................................................................................................4
1.1 Introduction................................................................................................................................. 4
1.2 Primary Output Power................................................................................................................ 7
1.3 Secondary Power Output............................................................................................................7
Using the Secondary Output for +5V devices.............................................................................. 7
Using the Secondary Output for +12V devices............................................................................ 7
1.4 Startup/Shutdown Controller (SSC) Overview........................................................................... 8
2.0 Installing the PSU-PC19.................................................................................................................9
2.1 Before You Begin....................................................................................................................... 9
2.2 Setting the Jumpers.....................................................................................................................9
2.2.1 Setting JP1 Jumpers........................................................................................................... 10
2.2.2 Setting JP2 (Secondary Output Voltage)........................................................................... 11
2.2.3 Using JP3 ACPI Relay Output ..........................................................................................12
2.2.4 Setting JP4 (Secondary Output Control) ...........................................................................12
2.2.5 Setting JP5 (Secondary Power Input Select) ..................................................................... 13
2.2.6 Setting JP6 (Primary Output Voltage Selection)...............................................................14
2.3 Connecting the Wiring..............................................................................................................14
2.3 Connecting the Wiring..............................................................................................................15
2.4 Optionally Connecting the Xenarc LCD Screen.......................................................................18
3.0 Using the Pulse Start Feature........................................................................................................ 20
3.1 Pulse Start Connections............................................................................................................20
3.2 Pulse Start Operation................................................................................................................20
3.2.1 What is a pulse?.................................................................................................................20
3.2.2 Starting the PSU with a pulse............................................................................................20
3.2.3 Stopping the PSU with a pulse ..........................................................................................21
3.2.4 Prolonging the Shutdown Delay State...............................................................................21
3.2.5 Shutting down the PSU with double pulses....................................................................... 21
3.2.6 Ignition Override................................................................................................................21
4.0 Startup/Shutdown Controller........................................................................................................22
4.1 Hibernate/Standby Operation ...................................................................................................22
4.2 SSC Operation States................................................................................................................ 22
4.2.1 Idle State............................................................................................................................ 22
4.2.2 RunDelay State.................................................................................................................. 22
4.2.3 Bootup Lockout State ........................................................................................................ 23
4.2.4 Run State............................................................................................................................ 23
4.2.5 Shutdown Delay State........................................................................................................23
4.2.6 Shutdown Sequence State..................................................................................................23
4.2.7 Forced Shutdown State......................................................................................................24
4.3 Fault Indicator LEDS................................................................................................................ 24
5.0 Conditions of Use ......................................................................................................................... 27
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CarNetix PSU-PC19 V2.0 Installation Manual
Summary of Notices & Disclaimers
CarNetix limited warranty is contingent upon proper and normal use and installation, and
does not cover damage due to external causes, including but not limited to, accident,
problems with electrical power, improper installation techniques or materials, liquids,
chemicals, oxidation, corrosion, exposure to the elements, servicing not authorized by
CarNetix, usage not in accordance with product instructions or specifications, failure to
perform required preventive maintenance, and problems caused by use of parts and
components not supplied by CarNetix.
CarNetix makes no express warranties or conditions beyond those stated in this warranty
statement. CarNetix disclaims all other warranties and conditions, express or implied,
including without limitation implied warranties and conditions of merchantability and fitness
for a particular purpose. Some states do not allow limitations on how long an implied
warranty lasts, so the above limitation may not apply to you.
CarNetix does not accept liability beyond the remedies set forth in this warranty statement
or liability for incidental or consequential damages, including without limitation any liability
for products not being available for use or for lost data or software.
CarNetix full warranty and return policies are stated in Section 5 at the end of this
document.
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CarNetix PSU-PC19 V2.0 Installation Manual
1.0 PSU-PC19 Introduction
NOTE: This manual and feature set apply to Rev 2.0 and above of the printed circuit board (PCB).
The PCB revision number is printed on the top of the PCB in white lettering. Please make sure you
are using the correct manual for the correct product revision.
1.1 Introduction
The PSU-PC19 is a 140 watt intelligent DC-DC power regulator designed to provide safe, reliable
power to the Xenarc SC8.
Figure 1 CarNetix PSU-PC19
The PSU-PC19 provides two outputs. The primary output is jumper selectable for 18V, 19V, or 20V
operation and can provide up to 6.32 amps (125 Watts @ 20V ). The secondary output is jumper
selectable to provide either +12V to power your Xenarc LCD screen, or +5V to power USB devices
(such as the Audigy 2NX sound USB sound card or USB powered hubs) with up to 3 amps (15
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CarNetix PSU-PC19 V2.0 Installation Manual
Watts). The PSU-PC19 can accept battery input as low as 7 volts under full load (140 watts) during
cranking while providing a well-regulated output so that your Xenarc SC8 not crash.
A third output can be added to the PSU-PC19 by installing the optional CNX-P5V regulator. This
will allow the PSU-PC19 to power your Xenarc SC8 (Primary Output), your Xenarc LCD screen
(+12V Secondary Output), and your USB devices (+5V from the P5V) simultaneously!
The PSU-PC19 includes all of the sophisticated features of its predecessors (P1260 and P1280/90)
such as Startup/Shutdown controller, Pulse Start (remotely start the PSU-PC19 with door locks, car
alarm, or wireless device), and DelayON (prevents speaker "thump" during booting). The PSU-
PC19 fully and safely supports "Standby" mode and will automatically shut itself down (by
detecting excess current drain) if the Xenarc SC8 fails to properly go into Standby mode.
The PSU-PC19 includes a power cable kit for “plug and play” installation with the Xenarc SC8
computer. This simplifies the installation and provides a safe, reliable connection for your Xenarc
SC8.
Figure 2 PSU-PC19 Power Cable Kit
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CarNetix PSU-PC19 V2.0 Installation Manual
PSU-PC19 V2.0 Features
•140 Watt Dual Output Regulator
•Jumper selectable main output of +18/+19/+20V
•Jumper selectable secondary output of +12V/+13.5V or +5V
•A THIRD output of +5V/15W can be added by installing the optional P5V regulator.
•Survives Engine Cranking under full load over entire temperature range
•Includes sophisticated Startup/Shutdown Controller
•Includes sturdy aluminum chassis with variable speed fan suitable for car environment
•Field upgradeable flash microprocessor
•Low battery monitor prevents drained battery, even during Standby
•“Deadman Timer” automatically exits Standby and turns the unit off after 3 days if jumper is set.
•"Anti Thump" delayed remote control for audio amplifiers
•Remote "Pulse Start" from wireless device or car alarm/remote start system
•Over current protection on both outputs with graceful forced shutdown of main output
•Powers both your Xenarc SC8 AND your Xenarc LCD screen or USB devices
•Full, safe support for Windows Standby mode including auto shutdown if PC fails to shutdown
•Over voltage surge suppression on battery input for protection of harsh automotive environment
•User replaceable fuse on battery input to protect your car from internal short circuits
•Now includes an internal ACPI isolation relay to provide full compatibility with the ACPI/power switch interfaces with
Xenarc PCs. No need for an external relay!
•Now includes “plug and play” cable (CNX-CA-XSC8) for connecting power and ACPI (power button) to Xenarc SC8.
Figure 3 PSU-PC19 Block Diagram
(Blk)
(Grn)
(Wht)
(Blk)
(Red)
(Red)
(Blue)
(Yel)
(Blk)
(Red)
(Red)
(Blk)
(Brn)
(Grn)
(Blu)
+12V Battery
GND
Ignition
Primary Output
+1
8
V
/
+1
9
V
/
+2
0
V
Secondary Output
+
5
V
/
+12V
/
+1
3
V
GND
ACPI (non-isolated)
(Blk)
PSU
-
PC19
Not used
DLYON
Pulse Start
ACPI (isolated)
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CarNetix PSU-PC19 V2.0 Installation Manual
1.2 Primary Output Power
The PSU-PC19 Primary Output can provide +18V, +19V, or +20V (note: these voltages have
actually been designed to be about .5V higher to overcome wiring losses in a typical installation) via
jumper selections on the PCB. The total current available on the primary output is 6.32 amps (120
watts at +20 Volts). The primary output of +19V is used to power your Xenarc SC8
1.3 Secondary Power Output
The PSU-PC19 also provides a Secondary Output of either +5V, +12V or +13V via jumper
selections. The total current available on the Secondary Output is 3 amps at +5 Volts, or about 1.3
amps at +12V (15 watts total). If you exceed the current or power limit of the secondary output it
will automatically shut down to protect itself from damage.
Note: a third output of +5V @ 3 amps (15 watts) can now be added to the PSU-
PC19 by installing the optional CNX-P5V regulator. This will allow the PSU-
PC19 to simultaneously power your Xenarc SC8, Xenarc LCD screen, and USB
devices. Download the CNX-P5V Installation Manual from our website for
instructions and details.
Using the Secondary Output for +5V devices
The +5V selection is typically used to power USB devices such as external USB sound cards (ie
Audigy 2NX) or powered USB hubs. The +5V output can provide up to 3 Amps. When jumpered
for +5V operation, the secondary output does not de-rate the total power available on the primary
output (see +12V Secondary Output below).
Using the Secondary Output for +12V devices
When the secondary output is jumpered for either +12V or +13V operation it derives its input from
the primary (+19V) output. Since the total power available from the primary output is 120 Watts,
when using the +12V/+13V secondary option, the primary output must be de-rated by current
consumed by the secondary output.
The secondary output can be jumpered to provide +12V at up to 1.3Amps for powering your
Xenarc LCD screen or other low powered +12V devices. However, since the Xenarc LCD screens
come with a cigarette lighter adapter using the secondary output to power the screen is optional.
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CarNetix PSU-PC19 V2.0 Installation Manual
1.4 Startup/Shutdown Controller (SSC) Overview
The PSU-PC19 contains a sophisticated, PIC microprocessor-based Startup/Shutdown Controller
(SSC). Its main job is to automatically start and stop your Xenarc SC8 when you turn ON or OFF
your ignition switch. However, it is also designed to help prevent HDD (hard disk drive) problems
by inadvertently removing power while your Xenarc SC8 is accessing the drive. The timing of the
bootup and shutdown signals are carefully designed to help prevent unwanted booting or shutdown
if the user turns ON or OFF the ignition while the Xenarc SC8 is already in the process of booting or
shutting down. Once the Xenarc SC8 begins its bootup or shutdown process, the SSC enters a
“bootup lockout” state that prevents the user from attempting to reverse this process until it has
completed.
In addition, the SSC provides control and monitoring to allow the Xenarc SC8 to safely enter
“Hibernation” or “Standby Mode”. These modes are selected jumpers on the PSU-PC19 and are
described in more detail in Section 3.
The SSC also contains a battery monitor which will shut the PSU-PC19 down in the event the
battery voltage drops below approximately 10.6 volts. This will help prevent deep discharge and
damage to your battery.
The SSC has a “Pulse Start” input that allows you to start the PSU-PC19 by using an externally
applied “pulse” from a device such as your car alarm, remote starter, or wireless device.
The various operating states of the SSC are described in more detail in Section 7 of this manual.
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CarNetix PSU-PC19 V2.0 Installation Manual
2.0 Installing the PSU-PC19
The following section is a summary of the installation of the PSU-PC19 and Xenarc SC8 computer.
2.1 Before You Begin
Before you begin the installation, make sure you take the time to read through these instructions.
The PSU-PC19 is a sophisticated, microprocessor-based device. Please read these instructions
carefully and contact us either in our Support Forum (www.carnetix.com/forum) or via email
([email protected]) if you have any questions or problems.
It is assumed that you have a basic to advanced understanding of electronics. It would be helpful,
and is highly recommended (especially if you plan to get much further involved in CarPCs) that you
purchase, as a minimum, a simple VOM (volt-ohm meter) or DMM (Digital Multi-Meter). These
devices are inexpensive (starting around $20) and will save you and me a great deal of time. They
can be purchase over the web or at your local retail electronics store (Radio Shack, Home Depot,
some hardware stores, some auto parts stores).
Installation of the PSU-PC19 consists of :
•Setting the Jumpers
•Connecting the Wires.
2.2 Setting the Jumpers
It is very important to set the jumpers before applying power to the PSU-PC19. The location and
function of the jumpers is presented below. More detail on the specific operation of each jumper
selectable function appears later paragraphs.
Jumper Functions
JP1 Pulse Start Input
Deadman Timer
Hibernate/Standby
Shutdown Delay Time
JP2 +5V/+12V/+13V Select
JP3 ACPI Relay Output
JP4 Secondary Output Control
JP5 Secondary Output Source
JP6 +18V/+19V/+20V Select
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CarNetix PSU-PC19 V2.0 Installation Manual
2.2.1 Setting JP1 Jumpers
Below is a table with the jumper selectable options that appear on JP1. To move a jumper from its
factory default position (open), use a pair of tweezers or needle nose pliers. Be careful to place the
jumper in the correct position or erratic behavior could result. Double-check your settings before
replacing the lid.
Pins
1-2 3-4 5-6 7-8 9-10
Function Pulse Start
Input Deadman Timer Hibernate/ Standby Not Used Shutdown Delay Time
Open
(default)
Connect to
external
contact
closure
Deadman
Timer
Disabled Hibernate Not Used 6 Seconds
Jumpered
Connect to
external
contact
closure
Deadman
Timer
Enabled Standby Not Used 15 minutes
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CarNetix PSU-PC19 V2.0 Installation Manual
Table 1 JP1 Settings
3.1.1.1 Pulse Start – See section 4.0
3.1.1.2 – Deadman Timer
When enabled, the Deadman Timer will automatically exit Standby mode after 3 days (72 hours)
and shut down the Primary Output power. This feature will allow you to use Standby without
worrying about leaving your car in Standby for extended periods of time and draining your battery.
When the Deadman Timer is disabled the PSU-PC19 remains in Standby until: 1) the ignition is
turned ON, 2) the low battery fault voltage (10.6V) is reached, or 3) an overcurrent condition exists.
In the latter two cases the PSU-PC19 exits the Standby mode automatically.
3.1.1.3 Hibernate/Standby – this jumper allows you to select either the Hibernate or Standby mode
for the PSU-PC19 after the ignition is turned off.
If Hibernate is selected the PSU-PC19 cuts all output power after the Shutdown Delay and
Shutdown Sequence have expired. This mode is used when you have set your PC to enter
hibernation via your BIOS settings.
If Standby is selected the PSU-PC19 will continue to provide output power on the Primary and
Secondary outputs after the Shutdown Delay and Shutdown Sequences have expired. This state is
used when your Xenarc SC8 is set to go into Standby when its ACPI (“power button”) is pressed.
This state is designed to provide a low level of power to the Xenarc SC8 to maintain the system state
in RAM. If the power demanded by the Xenarc SC8 during this time exceeds approximately 1 amp
the PSU-PC19 will automatically shut down to prevent damage. Also, while in standby, the PSU-
PC19 continues to monitor the battery voltage. If the battery voltage drops below approximately
10.6 volts, the PSU-PC19 will automatically shut itself down.
3.1.1.4 Shutdown Delay – this is the delay between the time you turn off your ignition and when
the SSC begins the Shutdown Sequence. It is jumper selectable for either 6 seconds (default) or 15
minutes.
2.2.2 Setting JP2 (Secondary Output Voltage)
JP2 allows you to select the output voltage that appears on the Secondary Power Output (J2 Pin 1).
If you choose to set the Secondary Output to +12V you need to make sure JP5 is set to the correct
position (see section 3.2.5).
+12V +5V +13V
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CarNetix PSU-PC19 V2.0 Installation Manual
2.2.3 Using JP3 ACPI Relay Output
JP3 is the output of the ACPI relay. These are “dry contacts” and act as a short circuit to produce the
ACPI pulse for starting (booting) your Xenarc SC8. These contacts simulate the power switch on the
chassis of your Xenarc SC8. When connecting to JP3 polarity does not matter since the relay acts as
a simple short circuit. This means that you can connect the GRN wire or BLK wire to either pin.
2.2.4 Setting JP4 (Secondary Output Control)
The JP4 jumper gives you the flexibility to use the Secondary Output in different ways depending
upon your CarPC system configuration. The Secondary Output can be turned ON or OFF based on
two different control signals: 1) DLYON or, 2) the signal that controls the Primary Output (PRI
OUT).
•DLYON
Jumpering DLYON will turn your Secondary Output ON or OFF with the DLYON signal. This
means that your Secondary Output will come on 3 seconds after your Primary Output comes ON,
and will go OFF when your ignition is turned OFF.
If you use the Secondary Output to power your screen (+12V) and want your screen to turn on and
off with your CarPC’s main power, then select DLYON to control your Secondary Output.
•PRI OUT
Jumpering PRI OUT will make the Secondary Output follow the control used to turn ON and OFF
the Primary Output. Thus, when the Primary Output is ON, the Secondary Output will also be ON. If
the Primary Output is OFF, the Secondary Output will be OFF.
This setting is affected by the jumper setting of the Shutdown Delay AND Hibernate/Standby
jumpers on JP1 as described in the next sections.
Shutdown Delay Effects on JP4
If you have set the Shutdown Delay jumper to the default position (6 seconds), both the Primary and
Secondary Outputs will be turned OFF 6 seconds after the Ignition is turned OFF. If you have set the
Shutdown Delay jumper for 15 minutes, both the Primary and Secondary Outputs will remain ON
for 15 minutes after the Ignition is turned off. This setting is useful for keeping certain USB devices
powered during the Shutdown Delay time. For example, if you use the Secondary Output to power
your USB WiFi card and you want to keep your WiFi card powered during the Shutdown Delay
time to transfer files, then set the jumper JP4 for PRI OUT.
Hibernate/Standby Effects on JP4
If you have the Hibernate/Standby jumper (JP1 Pins 5-6) set to Standby, the primary output is never
turned off (see Standby section). If you also have JP4 jumpered to follow the Primary Output, the
Secondary Output will also NOT be turned off when the unit goes into Standby mode. (ie Ignition is
turned off). Hence any devices connected to the Secondary Output will remain powered in Standby.
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CarNetix PSU-PC19 V2.0 Installation Manual
You should be very careful not to drain your battery when using Standby. It is highly advised that, if
you are using Standby, that you jumper your Secondary Output to follow DLYON.
Follows PRI OUT
Follows DLYON
2.2.5 Setting JP5 (Secondary Power Input Select)
** WARNING **
IT IS EXTREMELY IMPORTANT TO MOVE BOTH JP5 JUMPERS TOGETHER WHEN
SETTING JP5. IF YOU MOVE ONE JUMPER AND NOT THE OTHER, YOU WILL DAMAGE
YOUR PRIMARY OUTPUT REGULATOR!!!
JP5 controls which power input is applied to the Secondary Output regulator. Below is a simple
diagram which illustrates the concept.
The following rules apply to this jumper setting:
1) If you have set JP2 (Secondary Output Voltage) to +5V, you MUST set JP5 to the “+5V
Setting” which routes the +12V battery input to the Secondary Output regulator.
2) If you have set JP2 (Secondary Output Voltage) to +12V or +13V, you MUST set JP5 to the
“+12V/+13V Setting”. This will route the output of the Primary Output (+19V) to the input
of the Secondary Output regulator.
+12V
Battery
Input
+5V
+12/13V
+19 V
Regulator
Secondary
Regulator
Primary
Output
Secondary
Output
JP5
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CarNetix PSU-PC19 V2.0 Installation Manual
Again, it is very important that you move BOTH jumpers on JP5 together or you will damage your
Primary Output regulator!
+5V Setting
+12V/+13V Setting
2.2.6 Setting JP6 (Primary Output Voltage Selection)
JP6 allows you to select the output voltage that appears on the Primary Output (J2 Pin 4). The
selections are +18V, +19V, or +20V as shown below. Note: the actual voltage is set approximately
.5 Volts higher to compensate for any wiring losses you may have in your installation.
This jumper should be set for +19V operation for the Xenarc SC8.
+19V +20V +18V
Use +19V
setting for
Xena
r
c SC8
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CarNetix PSU-PC19 V2.0 Installation Manual
2.3 Connecting the Wiring
After you have set the jumpers for the options and performance of the PSU-PC19 you can connect
the input and output wiring. The steps outline below should be followed to insure proper operation
of the PSU-PC19 and Xenarc SC8.
Step 1 – Connect the input power and ignition to the PSU-PC19.
Use heavy gauge wire directly connected to the battery (via 15A fuse and distribution block).
4-8 GA wire is recommended if the SC8 runs a 2-3GHz processor. 8-10 GA wire is
recommended for lower speed processors. Using wire that is too small will cause the SC8 to
not survive engine cranking. Connect the battery wire to BOTH red input wires on J1 (pins 3
& 6).
Step 2 – Connect Ground to the PSU-PC19.
We recommend that you either run another wire directly to the battery, or connect directly to
the car chassis for grounding the PSU-PC19. If you run a wire to the battery, make sure it is
that same size as your +12V battery wire used in step 1. If you run a ground wire to the car’s
chassis, make sure to find a secure ground that is not corroded or painted and use the same
size wire as your +12V battery wire used in step 1.
Step 3 – Install optional Valet Switch.
A simple SPST switch installed in series with the ignition wire will allow you to manually
disable the PSU-PC19 so that it does not come on when the ignition is turned on. This is
optional and for convenience only
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CarNetix PSU-PC19 V2.0 Installation Manual
Step 4 – Connect the CNX-CA-XSC8 power cable kit
The CNX-CA-XSC8 power cable kit contains two pieces. The main power cable should be
inserted into the PSU-PC19 J2 connector (white 8-pin Molex connector). The green & black
“ACPI” (power button) cable should be attached to JP3 inside the PSU-PC19. You must
remove the lid of the PSU-PC19 to get access to JP3. Below is a diagram of the PSU-PC19
PCB showing the location of the JP3 jumper header. Replace the lid after you have attached
the connection.
Figure 4 ACPI Relay Jumper JP3
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CarNetix PSU-PC19 V2.0 Installation Manual
Step 5 – Test the PSU-PC19 before connecting the Xenarc SC8
It is recommended that you test the output of the PSU-PC19 before proceeding to the next
steps. Turn on the ignition and measure the voltage on the power connector pins 1 & 2 as
shown in the diagram below. The voltage should read approximately +19.4 volts.
Pin Wire Color Function
1 RED +19V
2 WHITE +19V
3 BLACK GND
4 YELLOW GND
Step 6 – Connect the CNX-CA-XSC8 power cable to the Xenarc SC8
Insert both the power connector and the ACPI connector into the SC8 as shown in the
diagram below.
Figure 5 Xenarc SC8/PSU-PC19 connections
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CarNetix PSU-PC19 Ver. 1.1 Pre-production Installation Manual
2.4 Optionally Connecting the Xenarc LCD Screen
The Xenarc LCD screen comes from the manufacturer with a cigarette lighter power adapter so that
it can be powered separately from the PSU-PC19. However, you can optionally use the secondary
output of the PSU-PC19 to provide +12V regulated power to the Xenarc LCD screen. Below are the
steps you should follow if you choose to do this. These steps assume that you have already installed
the PSU-PC19/Xenarc SC8 using the power cable kit outlined in the previous section.
Step 1 – Set the jumpers for +12V secondary output.
Set the jumpers as outlined in section 3.2.3 (JP3) and 3.2.5 (JP5) above for a +12V output
on the Secondary Output.
Step 2 – Connect the LCD screen power cable to the PSU-PC19 Secondary Output
Here you have two options; 1) Cut off the Xenarc LCD screen cigarette adapter and splice
the screen power cable into the PSU-PC19 Secondary Output. 2) Purchase the optional
CarNetix Screen Power Cable and splice it into the Secondary Output of the PSU-PC19.
The Secondary Output of the PSU-PC19 appears on the BROWN wire of the CNX-CA-
XSC8 power cable. You should connect this BROWN Secondary Output to the “+”
(positive) lead of your screen power cable. The “-“ (negative) lead of the screen power cable
should be splice into the BLACK ground wire of the CNX-CA-XSC8 power cable. These
connections are show in the picture below.
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CarNetix PSU-PC19 Ver. 1.1 Pre-production Installation Manual
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CarNetix PSU-PC19 Ver. 1.1 Pre-production Installation Manual
3.0 Using the Pulse Start Feature
The PSU-PC19 includes a feature that allows you to remotely start and stop the PSU. This feature is
called “Pulse Start”. This feature would normally be used in conjunction with a wireless device such
as a car alarm with auxiliary inputs/outputs or a WiFi device with Wake-On-LAN (WOL) features.
3.1 Pulse Start Connections
The Pulse Start input can either be an externally applied voltage (ie +5v or +12V) pulse, or a
momentary relay contact closure. The externally applied voltage pulse is connected to Pin 1 of J1
using the Blue wire. The momentary relay contact closure is connected to Pins 1&2 of JP1 (see
Section 2.2 for location). You can use either or both of these connections to start/stop the PSU.
3.2 Pulse Start Operation
3.2.1 What is a pulse?
Voltage Pulse on Pin 1 of J1
When connecting to Pin 1 of J2, the “pulse” must be a voltage that transitions from 0V to +V, and
then transitions back to 0V. The SSC will wait (hang) if the voltage stays high without going back
to 0V after the initial transition from 0V to +V.
The value of the +V can be any voltage from approximately +2V to +20V. Typical voltages are +5V
or +12V. The value of 0V must be below +.2V or open circuit (ie you could drive this input with a
relay that momentarily connects to a +12V source and then provides an open circuit).
The current required to drive this input is very low (milliamps).
Contact Closure Pulse on Pins 1&2 of JP1
When connecting to Pins 1&2 of JP1, the “pulse” must be a low resistance metallic contact closure
(ie relay) that transitions from OPEN to CLOSED, and then back to OPEN. The SSC will wait
(hang) if the contact closure remains CLOSED after the initial transition from OPEN to CLOSED.
The current passing through this relay is very small (milliamps) so a low power relay can be used.
Pulse Width
The pulse width can be any value from a minimum of approximately 100mSec to several seconds.
As mentioned above, if the pulse is very long the SSC will wait for the transition back to the normal
state before continuing.
3.2.2 Starting the PSU with a pulse
When the PSU is in Idle State (both LEDs off) and an externally applied pulse is applied to the Pulse
Start input, the PSU will power up normally, as it would if the Ignition line had gone high. During
the Bootup Lockout State any input pulse is ignored.
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