GL852GT Datasheet
CHAPTER 1 GENERAL DESCRIPTION
GL852GT is Genesys Logic’s premium 4-port hub solution which fully complies with Universal Serial Bus
Specification Revision 2.0, and it especially targets for special applications which require operating
temperature -40°C to 85°C. GL852GT 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. GL852GT has proven compatibility, lower
power consumption figure and better cost structure above all USB2.0 hub solutions worldwide.
GL852GT 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.
GL852GT supports LQFP48 package type, 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 package supports only partial hub features but provides smaller footprint that
targets space limited PCB layout environments such as embedded system or UMPC/MID applications.
Package
Type
LQFP 48
QFN 28
# of DS
Ports
4
4
Port #
Config.
EEPROM/
GPIO
EEPROM
Non-removable
Declaration
EEPROM/
GPIO
EEPROM
Power Mgmt.
Individual/Gang
Individual/Gang
LED Support
Green/Amber
N/A
EEPROM
93C46/ 24C02
24C02
GL852GT Package – LQFP48 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.
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