BECKHOFF CB4051 - Manual (Page 16)

Chapter: Connectors Power Supply
page 16 Beckhoff New Automation Technology CB4051
4.2 Power Supply
The power supply is effected via a 2x2pin connector (Molex PS 43045-04xx, mating connector: Molex PS
43025-04xx).
The board only requires an operating voltage of 5 volt ± 5%. 3.3V output to the PC/104-Plus bus is the
only off-board supply available.
Should additional voltages be needed for PC/104-Plus expansion cards, these must be provided
externally by connecting the respective pins on the PC/104-Plus connector (see below).
For maximum current availability, it is recommended to use both this power connector and the
PC/104-Plus connector for power supply.
C
AUTION
The CB4051 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 CB4051 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.
Description Name Pin Name Description
5 volt supply VCC 1 2 VCC 5 volt supply
ground GND 3 4 GND ground