GL852G データシートの表示（PDF） - Genesys Logic

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GL852G

USB 2.0 MTT Hub Controller

Genesys Logic 

GL852G Datasheet

CHAPTER 1 GENERAL DESCRIPTION

GL852G is Genesys Logic’s premium 4-port hub solution which fully complies with Universal Serial Bus

Specification Revision 2.0. GL852G implements multiple TT* (Note1) architecture that provide dedicated

TT* to each downstream (DS) ports, which guarantee Full-Speed(FS) data passing bandwidth when multiple

FS device perform heavy loading operations. The controller inherits Genesys Logic’s cutting edge

technology on cost and power efficient serial interface design. GL852G has proven compatibility, lower power

consumption figure and better cost structure above all USB2.0 hub solutions worldwide.

GL852G implements multiple hub configuration features onto internal mask ROM, which traditionally

requires one external EEPROM. The microprocessor detects general purpose I/O (GPIO) status during the

initial stage to configure hub settings such as (1) number of DSport, (2) declare of compound device (3)

gang/individual mode selection…etc. External EEPROM can be removed if no vendor specified PID/VID or

product string is required for the application.

GL852G supports three package types, summarized as below table. LQFP48/LQFN46 package provides full

hub features such as (1) two-color (green/amber) status LEDs for each DS ports, (2) Individual/Gang mode

power management scheme that indicates DS port over-current events. (3) Number of DS ports setting

configured by GPIO setting (4) non-removable declaration configured by GPIO setting (5) Support both

93C46 and 24C02 EEPROM (6) power switch polarity selections…etc. QFN28/SSOP28 package support only

partial hub features but provide smaller footprint that targets space limited PCB layout environments such as

embedded system or UMPC/MID applications.

Package

Type

LQFP 48

QFN 28

SSOP 28

LQFN46

# of DS

Ports

4

4

Port #

Config.

GPIO

EEPROM

Non-removable

Declaration

EEPROM/

GPIO

EEPROM

Power Mgmt.

Individual/Gang

Individual/Gang

LED Support

Green/Amber

N/A

EEPROM

93C46/ 24C02

24C02

4

EEPROM

EEPROM

Gang

N/A

24C02

4

GPIO

EEPROM/

GPIO

Individual/Gang Green/Amber 93C46/ 24C02

GL852G Package – Feature Summary

*Note 1: TT (transaction translator) is the main traffic control engine in an USB 2.0 hub to handle the

unbalanced traffic speed between the upstream port and the downstream ports.

©2012 Genesys Logic, Inc. - All rights reserved.

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