26
CMX32M cpuModule
BDM-610000075
Rev B
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
and ground for operation. A S5V may also be supplied to allow the system to support
Standby power states.
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 and all ground pins must
be connected. Do not use wire smaller than 20 gauge, and the length of the wire must not exceed 2 ft. The power
supply solution must be verified by measuring voltage at the Auxiliary Power Connector and verifying that it
does not drop below 4.75 V. The voltage at the connector should be checked with an oscilloscope while the
system is operational.
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.
WARNING
If you connect power incorrectly, the module will almost certainly be destroyed. Please verify
power connections to the module before applying power.
Table 7
Auxiliary Power Connector (CN3)
1
1. For more information on the ATX style signals, +5V Standby and PSON#, refer to the
section in Chapter 4,
.
Pin
Signal
Function
1
GND
Ground
2
+5 V
+5 Volts DC
3
GND
Ground
4
+5 V
+5 Volts DC
5
GND
Ground
6
GND
Ground
7
+5 V
+5 Volts DC
8
+5V_STDBY
+5V Standby (ATX)
9
+5 V
+5 Volts DC
10
PSON#
Power Supply On (ATX)
Summary of Contents for BDM-610000075
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