CompuLab SBC-X270 Bedienungsanleitung PDF herunterladen (Seite 36)

SB-X270 PC/104+ Single Board Computer

CompuLab LTD.

4.6. Power Supply Options

Supply voltage options are:

1. 5V only

In this case, 3.3V is generated on-board, by a step-down converter.

Note: additional cards, like PC/104+ or PCMCIA should not draw more than 3A from

3.3V.

2. 3.3V and 5.0V

3.3V and 5V can be supplied via the power connectors or PC/104+ connector.

3. 12V-48V input

The "S48" option allows the assembly of a versatile step-down switching converter. It

permits unregulated DC input in the range of 12V-48V and delivers a regulated 5V

supply to the system. Connector P28 should be used for high-voltage DC input.

GSM / GPRS supply

CM-X270W modules featuring the GSM / GPRS (K) option require 3.6V voltage for

proper operation. Replace R55 shown below with a 20k resistor to provide 3.6V to the

CM-X270. Cards are shipped by default voltage supply set to 3.3V rather than to 3.6V.

Without R55 modification, GSM / GPRS option would not work.

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CompuLab SBC-X270 Bedienungsanleitung Seite 36