Beckhoff CB4051 Manuel d'utilisateur télécharger pdf (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.

CAUTION

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

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 69 70

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Beckhoff CB4051 Manuel d'utilisateur Page 16