IPC@CHIP DB54
Hardware Manual V1.1 [04.10.2007]
4. Electrical Functions / Interfaces
4.1 Power supply
The 24V power supply input of the DB54 is protected against reverse polarity and transient over-voltages. An
operating voltage indication (LD1) is located near the power supply socket. Dimming of the power indication LED
signals reset of the SC23.
A switching controller from the 9...30V DC power supply of the DB54 is used to provide the internal 3.3V power
supply. This voltage is also provided at different pin header for external expansions, the 3.3V switching controller
can supply 600mA for external expansions. In the basic configuration, the maximum internal load of the 3.3V
power supply is 400mA. An additional switching controller provides 5V/500mA from the 24V operating voltage of
the DB54 for the USB host function.
4.2 ST12 & S1 - Power supply connector
Power supply connectors for the DB54
Pin assignment:
Pin No.
Designation
1 (pin)
24V DC (9..30V DC)
2 (shield)
GND
4.3 SW1 - 24V switch
Switch for the operating voltage of the DB54
Not assembled / optional assignment: e.g. APEM 25136NAH silver ON-ON
If the switch is to be assembled later, the 0 Ohm R13 resistor near the SW1must be removed.
Top view
9..30V DC (pin)
d)
GND (shiel
©2000-2008 Beck IPC GmbH
Page 7 of 24