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Detailed explanation of usb hub chip GL850G

elecfans | 30/04/2021

GL850G has product features such as low power consumption, low temperature and reduced number of pins.

It supports 4 downstream ports and can fully support the USB2.0/1.1 specification, so it is fully compatible with either the host side or the transmission connection with other USB device interfaces (high-speed/full-speed/low-speed device transmission). GL850G also has an overload protection function, provides good EMI/ESD handling, and also provides self-power and bus-power automatic detection modes. Users will not need to re-plug. Since the hub is a relay station between the host computer and peripheral devices, the market demand for USB hubs has grown substantially in terms of the current penetration rate of USB peripheral devices in the market and the popular types of peripheral devices. GL850G can be used in different application fields such as stand-alone hubs, laptop docks, or combined with other USB devices to form a USB composite hub. It not only simplifies the wiring method, but also helps users to manage easily, and can achieve expansion performance. purpose.

BLOCK DIAGRAM

GL850 is a 4-port standard USB hub controller, which complies with the USB2.0 standard. It can be connected to both USB1.1 host/hub and USB2.0 host/hub.

When the GL850 is connected to the USB1.1 host/hub, it works according to the USB1.1 standard. At this time, the upstream port will transmit data at full speed (12Mbps), and the downstream port will transmit data at full speed or low speed. When the GL850 is connected to a USB2.0 host/hub, it acts as a USB2.0 hub. The upstream port will transmit data at high speed (480Mbps) and the downstream port will transmit data at high speed, full speed or low speed.

An 8-bit RISC processor is embedded in the control/status register for controlling the content of the chip and responds to the requests from the usb host.

The firmware inside the GL850 chip will control the GPIO of the chip to access data from the external EEPROM, and then feedback the PID and VID information inside the EEPROM to the host. If there is no external EEPROM, GL850 will feed back the default setting information of the host in the internal ROM.

GL850 allows users to design its power supply mode flexibly. It can be designed as self-powered, bus-powered, and individual/ganged mode (one is for each port to be powered separately, and the other is for 4 ports as One group, to promote unified power supply). The selection of these functions is operated through the I/O port of GL850.

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