30
CMA34CR cpuModule
BDM-610000083
Rev L
Auxiliary Power (CN3)
The Auxiliary Power connector (
CN3
) can be used to supply power to devices that are attached to the
cpuModule. These devices include hard drive, front-end boards for data acquisition systems, and other devices.
Power can also be conveyed to the module through the Auxiliary Power connector (
CN3
). The cpuModule only
re5 V
DC
, +12 V
DC
, and ground for operation.
If using the Auxiliary Power connector to power the system, care must be taken to ensure good power
connections. The power and ground leads must be twisted together, or as close together as possible to reduce
lead inductance. A separate lead must be used for each of the power pins. All 5V pins, 12V pins, and all ground
pins must be connected. Do not use wire smaller than 20 gauge, and take care to ensure the length of the wire
does not exceed 2 ft. The power supply solution must be verified by measuring voltage at the Auxiliary Power
Connector and verifying that it meets the input voltage specifications. The voltage at the connector should be
checked with an oscilloscope while the system is operational.
G
Note
Although it is possible to power the cpuModule through the Auxiliary Power connector, the
preferred method is to power it through the bus connector from a power supply in the stack. The
cpuModule can have large current transients during operation, which make powering it through wires
difficult. Powering through the bus eliminates such problems as voltage drop and lead inductance.
Note
If you do choose to power the board through the Auxiliary Power connector you
must
connect all
wires to ensure enough power is being supplies to the cpuModule.
WARNING
This 12-pin power connector is
not
compatible with previous generations of RTD
cpuModules.
WARNING
If you connect power incorrectly, the module will almost certainly be destroyed. Please verify
power connections to the module before applying power.
Table 14
Auxiliary Power Connector (CN3)
Pin
Signal
Function
1
GND
Ground
2
+5 V
+5 Volts DC
3
+5 V
+5 Volts DC
4
GND
Ground
5
GND
Ground
6
+12V
+12 Volts DC
7
+12V
+12 Volts DC
8
GND
Ground
9
GND
Ground
10
+5 V
+5 Volts DC
11
+5 V
+5 Volts DC
12
GND
Ground
Содержание cpuModules CMA34CR
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