rtd cpuModule CMX147786HX, User Manual

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CMX147786HX RTD Embedded Technologies, Inc.
26
Auxiliary Power
CN3
The power supply can be conveyed to the module either through the PC/104 Plus bus (CN1, CN2,
CN16) or through the Auxiliary Power Connector, CN3. The cpuModule only uses +5 VDC and
ground. +12 VDC, -12 VDC and -5 VDC may be required on other PC/104 boards in the system.
Insufficient current supply will prevent your cpuModule from booting. The gauge and length of the
wire used for connecting power to the cpuModule must be taken into consideration. Some power
connectors have clip leads on them and may have significant resistance. Make sure that the input
voltage does not drop below 4.8V at the 5V power pins. A good rule of thumb is to use wire that
can supply twice the power your system requires.
WARNING! If you improperly connect power, the module will almost
certainly be
destroyed . Please verify power connections to
the module before applying power.
Table 5: Auxiliary Power Connector CN3
Pin Signal Function
1 GND Ground
2 +5 V +5 Volts DC
3 N/C Not Connected
4 +12 V +12 Volts DC
5 -5 V -5 Volts DC
6 -12 V -12 Volts DC
7 GND Ground
8 +5 V +5 Volts DC
9 GND Ground
10 +3.3 V See Note
11 N/C Not Connected
12 +3.3 V See Note
NOTE! The +3.3V pins (10 and 12) on the auxiliary power connec-
tor (CN3) are connected to the +3.3V pins of the PC/104-
Plus bus by default.
For more information on configuring the +3.3V pins on the
auxiliary power connector (CN3) or the PCI bus connector
(CN16), contact RTD Technical Support.
NOTE! -5 VDC, +12 VDC and -12 VDC voltages are not used by
the module, but are connected to the PC/104 bus connectors
CN1 and CN2.