Devices with USB. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Computers

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Due to the fact that a complex information exchange protocol is implemented in the USB interface, a microprocessor unit is required in the interface device with the USB interface, which provides support for the protocol. Therefore, the main option in the development of an interface device is the use of a microcontroller that will provide support for the exchange protocol. Currently, all major manufacturers of microcontrollers produce products that include USB blocks.

Figure 13 shows the USB bus connection to the ATtiny2313 microcontroller, which is used as a USB to RS232 interface converter.

The USB data lines (DATA- and DATA+) are connected to the PBO and PB1 pins of the AVR microcontroller. A microcontroller operating as a low-speed USB device must have a pull-up resistor R1 on the DATA- line. The voltage Vcc coming from the USB port of the computer can vary in the range of 4,4 ... 5,25 V. Before it is supplied to the microcontroller and the pull-up resistor, it is stabilized by the DA1 chip at a level of 3,0 ... 3,6 V. The type of voltage regulator depends on the load. The regulator must be of the low dropout integrated regulator type (LE35 with 3,5V output voltage).

From time to time, a variety of original USB devices appear, which differ not only in unusual functions, but also in design.

Information sources

1. cbstavka.nj
2. kazus.ru
3. gaw.ru
4. compdoc.ru
5. hi~def.ru
6. usb.org

Author: V. Novikov

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