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Author Topic: Power From The Keyboard Port  (Read 1850 times)


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Power From The Keyboard Port
« on: August 09, 2003, 09:01:37 PM »

Keyboard port has +5V power output to the keyboard. There is few hundred mA current available from this port and the keyboard takes it's own part of this available power. The maximum power available is usually limited by a fuse which is connected between motherboard +5V power line and the +5V output in the keyboard connector. Usually the fuse (typically 1A) is a small component which looks like a resistor and is directly soldered to the motherboard. Some older motherboard have used a normal glass fuse or they have not had fuse at all.

There are two different PC keyboard connector models in use. The older model is 5-pin DIN connector. This connector has +5V available at pin 5 and ground at pin 4. The pin numbering is usually marked in the connectors, but here is the pin numbering of the connector then you look it at your computer back:

       4   5
      1     3

The other keyboard connector is PS/2 keyboard connector which is 6-pin mini-DIN connector. This connector has +5V power at pin 1 and ground at pin 2. Here is the pin numbering when you look at the keyboard connector at the back of the computer.
        4 u 6
       1  .  2
        3   5

Hope This Helps ...

:: LZ ::
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