Hardware Reference
In-Depth Information
When 3 1/2-inch floppy drives were first being integrated into PCs in the mid-1980s, it was clear that
a smaller power connector was necessary. The answer came in what is now known as the floppy
power connector , which was created by AMP as part of the economy interconnection (EI) series.
These connectors are now used on all types of smaller drives and devices and feature the same +12V,
+5V, and ground pins as the larger peripheral power connector. The floppy power connector has four
pins spaced 2.5mm (0.098 inches) apart, which makes the entire connector about half the overall
width as the larger peripheral power connector. The pins are rated for only 2 amps each, giving a
maximum power-handling capability of 34 watts.
Table 18.18 shows the pinouts for the smaller floppy drive power connector.
Table 18.18. Pinout for the 3 1/2-Inch Floppy Power Connector (Small Drive Power Connector)
The peripheral and floppy power connectors are universal with regard to pin configuration and even
wire color. Figure 18.31 shows the peripheral and floppy power connectors.
Figure 18.31. Peripheral and floppy power connectors.
The pin numbering and voltage designations are reversed on the floppy power connector. Be careful
if you are making or using an adapter cable from one type of connector to another. Reversing the red
and yellow wires fries the drive or device you plug into.
Serial ATA Power Connectors
If you want to add Serial ATA drives to an existing system, you will need a newer power supply that
includes a Serial ATA (SATA) power connector. The SATA power connector is a special 15-pin
connector fed by only five wires, meaning three pins are connected directly to each wire. The overall
width is about the same as the peripheral power connector, but the SATA connector is significantly
thinner. All the most recent power supply form factor specifications include SATA power connectors
as mandatory for systems supporting SATA drives. Figure 18.32 shows a SATA power connector.
 
 
 
 
Search WWH ::




Custom Search