GL850G - USB 2.0 hub controller

The GL850G is a highly regarded USB 2.0 hub controller manufactured by Genesys Logic, renowned for its exceptional performance and versatility. It supports up to 4 downstream ports, and also individual and gang mode for power management. Number of downstream ports and non/removable downstream port can be configured by different ways, such as EEPROM, SMBUS or I/O strapping. The upstream port supports both high speed and full speed specifications, while the downstream ports support high speed, full speed and low speed traffic. The GL850G is available in 48 pin LQFP, 28 pin SSOP and 24 pin QFN.

 

GL850G Pinout 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

• Compliant to USB Specification Revision 2.0
  • Upstream port supports both high-speed (HS) and full speed (FS) traffic
  • Downstream ports support HS, FS, and low-speed (LS) traffic
  • 1 control pipe (endpoint 0, 64-byte data payload) and 1 interrupt pipe (endpoint 1, 1-byte data payload)
  • Backward compatible to USB specification Revision 1.1
• On-chip 8-bit micro-processor
  • RISC-like architecture
  • USB optimized instruction set.
  • Performance: 6 MIPS @ 12MHz
  • With 64-byte RAM and 4K mask ROM
  • Support customized PID, VID by external EEPROM/ SMBUS/
  • Support downstream port configuration by external EEPROM/ SMBUS/
• Single Transaction Translator (STT)
  • Single TT shares the same TT control logics for all downstream port devices. This is the most cost-effective solution for TT.
• Integrate USB 2.0 transceiver.
  • Improve output drivers with slew-rate control for EMI reduction.
  • Internal power-fail detection for ESD recovery
• Low BOM cost
  • Built-in 5V to 3.3V regulator
  • Built-in upstream 1.5KΩ pull high and downstream 15KΩ pull-down.
  • Built-in PLL supports external 12 MHz crystal / Oscillator clock input.
  • Embed serial resister for USB signals.
• Low power support
  • Support Selective Suspend
  • Support LPM L1 with EEPROM
• Smart power mode
  • Support both individual and gang modes of power management and over-current detection for downstream ports (Individual mode is not supported by SSOP 28 package)
  • Conform to bus power requirements.
• Flexible design
  • Number of Downstream port can be configured by SMBUS / EEPROM/
  • Compound-device (non-removable in downstream ports) could be configured by I/O strapping/ SMBUS / EEPROM/
  • Automatic switching between self-powered and bus-powered modes
• Available package:
  • 28 pin QFN (5x5mm)
  • 28 pin SSOP (209mil)
  • 24 pin QFN (4x4mm

 

USB HUB Controllers Compatible with GL850G

GL852G

 

Other Popular USB HUB Controllers

FE1.1S, PL2586

 

Note: Complete technical details can be found in the GL850G datasheet at this page’s end.

 

GL850G Block Diagram

 

GL850G Application Circuit Diagram

The following image shows the typical application circuit for the GL850G.

Apart from the crystal oscillator and USB ports, GL850G requires an output capacitor for filtering and stability purposes. Pullup resistors are used with the configuration pins.

 

Applications

• Standalone USB hub
• NB / Tablet / Motherboard / Docking Station
• Gaming console
• LCD monitor hub
• Any compound device to support USB hub function.

 

2D-Model and Dimensions

Below is the 2D CAD drawing of GL850G in SSOP28 package along with its dimensions in millimetres. The dimensions can be used to create custom footprints of the module and be used for PCB or CAD modelling. For other package dimensions please refer the datasheet at this page’s end.