on December 17th 10,651

A Guide to the GL850G USB 2.0 Hub Controller

In today's fast-paced electronics landscape, seamless connectivity and efficient power management are dynamic. The GL850G USB 2.0 Hub Controller by Genesys Logic offers a robust solution for managing up to four downstream ports with precision. With independent or gang power control, flexible configurations, and support for multiple USB speeds, it meets diverse system design needs. Ideal for USB hubs, docking stations, gaming consoles, and motherboards, the GL850G delivers reliable performance and streamlined connectivity. Features like EEPROM programming, SMBUS interface, and compact packaging ensure flexibility while optimizing space and power. This article explores its technical capabilities, design benefits, and broad applications, showcasing why the GL850G is a trusted choice for you.

Catalog

Pin Configuration

Pin	Name	Function
1	AVDD	3.3V analog power input for analog circuits
2	DM2	Downstream 2 port Data -
3	DP2	Downstream 2 port Data +
4	RREF	Connect 680Ohms resistor between RREF and AGND
5	AVDD	3.3V analog power input for analog circuits
6	X1	12MHz Oscillator input
7	X2	12MHz Oscillator input
8	DM3	Downstream 3 port Data -
9	DP3	Downstream 3 port Data +
10	AVDD	3.3V analog power input for analog circuits
11	DM4	Downstream 4 port Data -
12	DP4	Downstream 4 port Data +
13	RESET	Active low external reset
14	TEST/SCL	Chip will be in test mode if pulled high / I2C Clock output
15	GND	Ground
16	DVDD	3.3V digital power input for digital circuits, Logic Level
17	PSELF	0: GL850G is bus powered, 1: GL850G is self-powered
18	PGANG	Individual / Gang mode select
19	OVCUR2	Active Low over current indicator
20	PWREN2	Active Low power enable output
21	OVCUR1	Active Low over current indicator
22	PWREN1	Active Low power enable output
23	V5	5V to 3.3V regulator input
24	V33	3.3V regulator output
25	DM0	Upstream port Data -
26	DP0	Upstream port Data +
27	DM1	Downstream 1 port Data -
28	DP1	Downstream 1 port Data +

Features of GL850G

Feature	Description
USB Specification	Compliant to USB Specification Revision 2.0; backward compatible to USB Specification 1.1.
Upstream Port	Supports both high-speed (HS) and full-speed (FS) traffic.
Downstream Ports	Supports HS, FS, and low-speed (LS) traffic.
Pipes	1 control pipe (Endpoint 0, 64-byte data payload); 1 interrupt pipe (Endpoint 1, 1-byte payload).
Microprocessor	On-chip 8-bit microprocessor with RISC-like architecture and USB-optimized instruction set.
Performance	6 MIPS @ 12 MHz.
Memory	64-byte RAM and 4K mask ROM.
Customized PID/VID	Supported via external EEPROM/SMBUS.
Downstream Port Configuration	Supported via external EEPROM/SMBUS.
Single Transaction Translator (STT)	Shares the same TT control logic for all downstream port devices (cost-effective solution).
Transceiver Integration	Integrates USB 2.0 transceiver.
Output Drivers	Improved with slew-rate control for EMI reduction.
Power Management	Built-in 5V to 3.3V regulator.
Power-Fail Detection	Internal power-fail detection for ESD recovery.
Pull-Up/Pull-Down Resistors	Built-in upstream 1.5KΩ pull-up; downstream 15KΩ pull-down.
PLL	Built-in PLL supports external 12 MHz crystal/oscillator clock input.
Serial Resistor	Embedded serial resistor for USB signals.
Low Power Support	Supports Selective Suspend, LPM L1 (via EEPROM).
Smart Power Mode	Supports individual and gang modes of power management and over-current detection.
Bus Power	Conforms to bus power requirements; automatic switching between self-powered and bus-powered modes.
Downstream Port Configuration Flexibility	Configured via SMBUS/EEPROM.
Compound Device Support	Configurable by I/O strapping, SMBUS, or EEPROM.
Available Packages	- 28-pin QFN (5x5 mm)
	- 28-pin SSOP (209 mil)
	- 24-pin QFN (4x4 mm).

Compatible USB Hub Controllers

• GL852G

Acclaimed USB HUB Controllers

• FE1.1S

• PL2586

Block Diagram

Circuit Diagram

In addition to the crystal oscillator and USB ports, the GL850G USB hub controller requires an output capacitor to ensure proper filtering and stability of its power supply. Furthermore, pull-up resistors are useful for the configuration pins to maintain appropriate voltage levels and enable reliable operation.

Applications of GL850G

The GL850G demonstrates adaptability in a wide range of electronic devices, including standalone USB hubs, computers, tablets, motherboards, docking stations, gaming consoles, and LCD monitors. Its exceptional support for sophisticated USB functionalities enriches your experience across various aspects.

USB Hubs and Technology Integration

Incorporating the GL850G into USB hubs offers you extended connectivity, ensuring smooth data transfer and power delivery, and catering to the desire for reduced cable clutter and enhanced workspace efficiency. Integrating such technology into daily environments signifies a move toward more ergonomic and streamlined settings.

Elevating Computer and Tablet Performance

For computers and tablets, the GL850G chip optimizes data transfer rates, enhancing device performance in demanding applications and data-heavy tasks. Such integration nurtures the potential for better multitasking and operational effectiveness. You can often find that slight improvements in data transmission can greatly affect their experience and satisfaction.

Motherboards and System Fine-Tuning

When applied to motherboards, the GL850G chipset fine-tunes communication among components, boosting system responsiveness and efficiency. This optimization supports you in sustaining high-performance operations, benefiting both personal usage and professional environments where dependable performance is highly valued.

Docking Stations

In docking stations, the GL850G plays an active role in expanding connectivity and enabling simultaneous peripheral connections. This innovation addresses the need for flexible workspaces by effectively linking portable devices with comprehensive desktop configurations.

Gaming Consoles

Utilizing the chipset in gaming consoles ensures fluid data exchange and peripheral support, enriching your engagement. This focus on performance aligns with consumer expectations for seamless gaming adventures, where even small enhancements can have a remarkable impact.

LCD Monitors

The GL850G's integration into LCD monitors facilitates the efficient operation of USB ports, promoting cleaner setups and removing the necessity for extra adapters. These advancements align with a deeper awareness of how visual clarity and connectivity boost productivity and contentment.

Dimensions and Physical Design