USB cable forcomputerThe connection and communication with external devices can also be used for phone charging and external connection.Generally speaking, it is used for data transmission and charging.
USB is the most widely used external bus standard in the PC field, which is used to regulate the connection and communication between computers and external devices,USB interfaceSupport the plug and play and hot plug functions of the device.With the rapid development of computer hardware, the application of USB has increased the speed of data transmission between external devices. The biggest benefit of the speed increase for users is that they can use more efficient external devices. For example, with a USB 2.0 scanner, it only takes about 0.1 seconds to scan a 4M picture, which greatly improves the work efficiency.
USB supports devices according to different interfaces and data cables: mouse, keyboard, printer, scanner, camera, flash disk, MP3 machine, mobile phone, digital camera, mobile hard disk, external optical floppy driveUSB network card, ADSL Modem, Cable Modem and other electronic products.
Interface definition
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Red, white, green and black are the standard wiring colors, corresponding to pins 1, 2, 3 and 4 respectively;
The four wires are 1-power 2-data 3-data 4-power
The general arrangement is: red, white, green, black, from left to right
definition:
Red - USB power supply marked with - VCC, Power, 5V, 5VSB
White - USB data cable (negative) - DATA -USBD-、PD-、USBDT+
Green - USB data cable (positive) - DATA+USBD+、PD+、USBDT+
Black - ground wire - GND, Ground
USB is a commonly used PC interface, which has only four wires, two power supplies and two signals. It should be noted that the positive and negative poles must not be reversed, or the USB device or computer will be burnedNanqiao chip！
USB interface definition diagram
Common USB interface:
Common USB interface
From left to right: miniUSB male port (A-type plug), miniUSB male port (B-type plug), USB male port (B-type plug), USB
Female port (A-type socket), USB male port (A-type plug).
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USB data cable interface spec
10 pin mini USB connector is adopted for the mobile phone terminal female socket, and the model is LINKTEK: USBXN-01015-TP0X (compatible products of other manufacturers can also be used). The pin arrangement is shown in Figure 1 (interior view):
Figure 1 10 pin mini USB interface female pin diagram
Definition of USB data cable interface:
Pin No
name
Function definition
one
Suspended
Suspended
two
VCHG
Charging voltage
three
Suspended
Suspended
four
USB_D－
USB data -
five
Suspended
Suspended
six
USB_D+
USB data+
seven
Suspended
Suspended
eight
Suspended
Suspended
nine
Suspended
Suspended
ten
GND
Grounding
Wire material requirements:
1. The PC end interface is a standard Stand A interface.
2. For the specifications and dimensions of USB interface, please refer to the detailed provisions in the USB2.0 protocol standard.
3. The mobile terminal interface is the above 10 pin MINI USB interface male, please select the matching interface.
4. The two ends of the download cable are the mobile phone connection port and the PC USB port. The length of the cable is 1 meter, the diameter of the cable is 3.8 mm, the cable is a standard mesh shield wire, and the outer cover and SR are 75 degree flame retardant PVC.
classification
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Ordinary USB cable
USB cable
There is no central control chip. You must plug in your mobile phone and computer before you can recognize the cable. The price is cheap.Typical models: Samsung CDMA series, D500 series;Motorola E398Series, V3 series;NOKIADKU－2；NECN720 series;Siemens 65 series, etc.
With IC USB cable
With a central control chip, the models of ordinary chips are 2303, 2101 and 3116. You can also recognize the line without plugging in a mobile phone or computer. Since the price of an IC is more than 10 yuan, the price is more expensive than that without an IC.The working principle of the data line with the chip is USB to COM, which converts the USB interface into a serial port and displays it on the computer.
Typical model:Samsung E638Series, D418 series;NEC N610 series;Siemens 25 series and 55 series;Sony EricssonMobile data cable；Panasonic mobile phone data cable;Lenovo mobile phone data cable, etc.
Special USB cable
Non ordinary popular chips, special models of chips such as DKU-5, CA-42, DCU-11, etc.
Note: Don't mistake the quality with IC for that without IC. The actual production with or without IC is based on the applicable model of the mobile phone.
Classified from manufacturers
Original factory;Domestic brands;No domestic brand.
1. Original packaging: directly produced by the mobile phone manufacturer, or entrusted to a manufacturer to provide materials for OEM. The brand of the mobile phone marked on it is the best in quality and the most expensive.
2. Domestic brand: the data cable has its own brand. In addition, the manufacturer's address and phone number are printed on the package, which is relatively formal, good quality and low price, such as the Dingli USB data cable.
3. No brand: no identification of manufacturer and brand.There are two types of data lines. The first is professional export data lines. Foreigners do not need to stick Chinese brands. The quality of this line is very good, the price is lower than that of domestic brands, and the cost performance ratio is the highest;The second is the inferior brand line. The price is very low and the quality is very poor. You should be careful when you buy it. Please choose a reputable seller to buy it.
USB2.0 and 3.0
USB3.0 is developed by Intel, Microsoft, HPTexas InstrumentsThe USB3.0 promotion team composed of industry giants such as NEC, ST-NXP, etc. announced on November 18, 2008 that the USB3.0 standard had been officially completed and publicly released.The USB3.0 standard provides 10 times the transmission speed of USB 2.0 and higher energy efficiency, which can be widely used in PC peripherals and consumer electronics.The theoretical bandwidth of USB3.0 interface is increased to 5Gbps, while the theoretical bandwidth of USB2.0 is 480Mbps.All high-speed USB2.0 devices will perform better when they get to USB3.0.
USB2.0 data cable
Main differences:
1. The data bandwidth of USB3.0 is ten times that of USB2.0, which can reach 5Gb/s (480MB/s),Synchronous transmissionThe bandwidth can also reach 384MB/s, which is one of the main differences between USB3.0 and 2.0;
2. Low power consumption (about 25% lower than USB2.0 when the data transmission volume is 20MB/s);
3. USB3.0 is more energy-efficient than 2.0, and the power saving mode can be used for the equipment in the waiting state temporarily;
USB 3.0 data cable
4. USB3.0 can provide more power through cables (2.5W is increased to 4.5W);5. USB3.0 is backward compatible and supports USB2.0 devices, but USB2.0 cannot support USB3.0.Development trend
The increasing power of USB cable means that people can use it toNotebook computercharge.[1]
Intel and its allies are developing USB Power Transfer (USB PD) technology.USB 2.0 can transmit 2.5 watts of power, USB 3.0 is 4.5 watts, USB BC cable can transmit 7.5 watts of power, while USB PD can support 10 watts of mobile devices, 18 watts of tablet devices and most peripherals, 36 watts of thin client devices, larger peripherals, 60 watt laptops, docking stations, and 100 watt workstations.
The emergence of USB PD simplifies the charging process of mobile phones, tablets and other devices.Intel engineers Sanders and Dunstan said: "By supporting tablet computers, laptops and other devices, it makes the charging range more extensive."
From the interface
USB female, USB male, USB print cable, MINI USB, micro USB
Pin sequence (Plug on the left, Receptacle on the right, note that the oblique port pointed by the arrow is upward, and the USB port is facing itself):
USB interface pin sequence
The pin definition and package size are the same as the description of A-type USB pin.
