【 Weak current College 】 usb interface is how to supply

1, using + 5VSB or + 5V power supply
Some low-end motherboard manufacturers for production cost considerations, there is the direct use of switching power supply out of + 5VSB or + 5V power supply, which have one or no insurance power or current limiting resistor. Doing so will cause such as a USB interface or USB peripherals failure would create host no power or cannot start. If a host is a problem when inserting USB peripherals will cause the motherboard to immediately restart.

2. using the + 5V power supply IC through current limiting or power supply using the power tubes controlled
This design is generally seen in high-end motherboard, USB power supply circuit in a capacitor filter the current limiting resistor, insurance, or power management IC, this design can ensure that the Board of each USB interface for peripherals provide maximum 500MA supply current while when peripheral IC short circuit, current limit will be automatically cut off power supply, USB interface guarantees that the host normal stable work. However, because only the maximum supply current 500MA, so when we use the removable disk drive, often appears unable to recognize disk, disk files are not easy to read copy of small files, but cannot copy large file, copy the file easy to panic.
Like yingtai KBNHAG motherboard to use Board rear USB interface power supply more stable to light and USB power supply for a separation.
Because the rear USB interface and keyboard interface is similar, so most of the motherboard in design time using a rear USB interface and power supply with light, near the keyboard interface will normally be a JB1 jumper, users can choose whether to use the + 5VSB (can provide light on features, wake on LAN feature, but the current relatively small, cannot meet the mobile hard disk power supply) power supply; or use the + 5V power supply (supply current is large, but not the light turned on). However some motherboards are designed to remove the jumper, so when the computer shuts down light lamp always, this situation can only be used in the computer and unplug the host system powered power plug can be completely powered off.
Mid-range motherboard manufacturers mostly in USB power supply circuit design power filtering and recoverability insurance resistance to protect the stability of the work, avoid the motherboard are hot-pluggable USB peripherals, panic or restart. Below because manufacturers using a simple power supply, causing power loop filter inductance of the more serious burns.

3. using the + 5V power supply IC through current limiting or power supply using the power tubes controlled
This design is generally seen in high-end motherboard, USB power supply circuit in a capacitor filter the current limiting resistor, insurance, or power management IC, this design can ensure that the Board of each USB interface for peripherals provide maximum 500MA supply current while when peripheral IC short circuit, current limit will be automatically cut off power supply, USB interface guarantees that the host normal stable work. However, because only the maximum supply current 500MA, so when we use the removable disk drive, often appears unable to recognize disk, disk files are not easy to read copy of small files, but cannot copy large file, copy the file easy to panic.

Considerations
6-pin USB interface, which is the power supply and power in common. 9-pin and 10-pin USB interface, the 9-pin null, is to locate and prevent reverse USB interface, causing burning Board. If we have questions about when in the judgment, we can also assist by multimeter, to determine the accuracy of the connection.

The difference with other interface
1, 9-pin COM interface
Now because the USB and 1394 interface for rapid popularization, both of connect installation convenient, can live plug, so that often use the COM port is now less appear on the motherboard. In order to take account of different manufacturer's customer base, just keep the motherboard pin COM port need of user separate external use.
As a result of the use of COM is also a nine-pin connector, some users to connect the front USB interface when an error occurs. Note the difference between the COM port of the 10-pin is empty while perimeter graph General there will be a box, then there is an obvious "COM" letter.

2, 9-pin front audio interface
Although the front panel audio connector (J_AUDIO) is a nine-pin, but empty pin typically 7-pin, while the interface is usually a sound card or in the vicinity of the rear-mounted headset interface.

10-pin front panel audio connector (junxing 845PEML), the audio interface with the General common 9-pin front panel audio connector, 1, 9 is the right channel, 2, 10 is the left channel, 3, 4, 5 to 7, as VCC, 6 8 for MICIN, empty feet.

3, 9-pin front panel interface
Front panel interface is usually the power switch, reset button, the hard drive light, power lights. These wires are usually grouped together, and just nine pin, if not the illustration, and is very similar to the front USB interface. However, we can note the empty PIN is reset is the 10-pin, especially new motherboards that interface with clear distinction of color, so it is not prone to error.

4, 9-pin interface INFOLINK
In view of the gigabyte motherboard GA-IG1000-G.

5, 9-pin SPDIF interfaces
In view of the gigabyte motherboard, however weixing and the interface where void PIN to pin 5.

6, 9-pin interface to JDB
In weixing MS-6566, 6580 motherboard, it is necessary to pay attention to the interface and is very similar to the front USB interface and is also the ninth needle. vacancies

7, single-row 5-pin connector
　　
Infrared interface
Infrared interface pins similar to defining and USB, VCC, GND feet, then send and receive two feet, but infrared interface is used for single-row five-pin empty is the fourth pin, rather than the5-pin.