 USB connector
The left figure shows the terminals of a USB connector. This is USB-Type-A male connector. This connector is the common type used for connection with PC.
The pinout description which viewed from connector side is GND(Ground for voltage), +DATA(Output from computer), -DATA(Input to computer) and +5V from the left.
The case of a connector is connected to the shield wire of the cable and grounded by the equipment side.
Specification of USB
| Items | USB1.1 | USB2.0 |
| Low-speed | Full-speed | High-speed |
| Transfer rates | 1.5Mbps | 12Mbps | 480Mbps |
| Max number of endpoints | 2 | 15 | - |
Transfer mode/
Packet size(B) | Control | 1 - 8 | 1 - 64 | 1 - 64 |
| Interrupt | 1 - 8 | 1 - 64 | 1 - 3,072 |
| Bulk | - | 1 - 64 | 1 - 512 |
| Isochronous | - | 1 - 1,023 | 1 - 3,070 |
The USB driver IC which used in this time supports USB Ver1.0 and 1.1. High-speed communication is possible for Ver2.0 but it doesn't use in this time.
I will explain the specifications for Ver 1.0 and 1.1 below. However, the contents to explain are not detailed. Please read some technical books, if you want to know more things. |
