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Chapter: Connectors Power Supply

page 16 Beckhoff New Automation Technology CB4053

4.2 Power Supply

The connector for the power supply is a standard IDC socket connector with a spacing of 2.54 mm.

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 expansion cards, these must be provided externally by

connecting the respective pins (see below).

For maximum current availability, it is recommended to use both this power connector and the PC/104

connector for power supply.

NOTE

For "Real Time Clock" an external battery (3.3V) must be connected. You can use pins 1 & 3 here or the

"System" connector (see next page).

CAUTION

The CB4053 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 CB4053 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

ground GND 1 2 VCC 5 volt supply

CMOS battery >= 3 volt VBAT 3 4 12V 12 volt supply

-5 volt supply -5V 5 6 -12V -12 volt supply

ground GND 7 8 VCC 5 volt supply

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 74 75

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Beckhoff CB4053 Manual de usuario Pagina 16