BECKHOFF CB4055 - Manual (Page 16)

Chapter: Connectors Power Supply
page 16 Beckhoff New Automation Technology CB4055
3.2 Power Supply
The power supply of the hardware module is realized via a 2x5-pin connector (Molex PS 43045-10xx,
mating connector: Molex PS 43025-10xx). Both 5V VCC/SVCC and 12V need to be provided. The 12V
input can optionally be tied to 5V if 12V is not required by attached peripherals. It cannot, however, be left
unconnected.
C AUTION
The CB4055 includes circuitry that will notify an intelligent power supply to shut down if the processor
reaches a critical temperature. This is achieved by deasserting the (low-active) PS_ON# signal found on
the SM-Bus connector. When PS_ON# is no longer pulled low, an intelligent power supply would take this
as a signal to shut down power. For this to work, PS_ON# must be connected to the power supply's
PS_ON input. If PS_ON# is not otherwise connected, the CB4055 can be damaged beyond repair if a
thermal shutdown event occurs. In rare instances, if power is not shut down, the board will continue to
heat up until failure occurs.
N
OTE
Since this is a 90 degree connector, the symbol in the drawing below represents the connector face as
seen from the side (PCB on bottom) rather than from above.
Description Name Pin Name Description
12 volt supply 12V 1 6 12V 12 volt supply
ground GND 2 7 GND ground
ground GND 3 8 SVCC standby-supply 5V
ground GND 4 9 GND ground
5 volt supply VCC 5 10 VCC 5 volt supply