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GL852GT
產品簡述

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-60 provides multiple advantages to simplify board level design that help achieving lowest BOM (Bill of Material) for system integrator. GL852GT-60 integrates both 5V to 3.3V and 3.3V to 1.8V low dropout voltage regulator into single chip, therefore no external LDO required.

 

GL852GT-60 embeds an 8-bit RISC processor to manipulate the control/status registers and respond to the requests from USB host. Firmware of GL852GT-60 will control its general purpose I/O (GPIO) to access the external EEPROM and then respond to the host the customized PID and VID configured in the external EEPROM. Default settings in the internal mask ROM is responded to the host without having external EEPROM. GL852GT-60 provides better design flexibility for customers. The complicated settings such as PID, VID, and number of downstream ports settings etc. are easily achieved by programming the external EEPROM or SMBUS mode.

 

GL852GT-60 is a full function solution which supports both Individual and Gang (4 ports as a group) mode for power management. Downstream ports and non/removable downstream port can be configured by different ways, such as EEPROM, SMBUS or I/O strapping. For the detailed configuration methods, please refer to the following table.

Package

Type

# of DS

Ports

Port Configuration

Non-removable

Declaration

Power Control

EEPROM

QFN 28

4

EEPROM,

SMBUS,

I/O strapping

EEPROM, SMBUS

Individual/Gang

24C02

*Note1: 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.


  • 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/ Vendor command
    • Support downstream port configuration by external EEPROM/ SMBUS/ Vendor command
  • Multiple Transaction Translator (MTT)
    • Each downstream port has individual Transaction Translator control logic
  • 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
    • LPM L1 option by EEPROM
  • Smart power mode
    • Support both individual and gang modes of power management and over-current detection for downstream ports
    • Conform to bus power requirements
  • Flexible design
    • Each of downstream ports can be enabled/disabled individually by SMBUS / EEPROM / IO Strapping without the limit of disabling in sequence.
    • Compound-device (non-removable in downstream ports) could be configured by SMBUS / EEPROM
    • Automatic switching between self-powered and bus-powered modes
  • Available package
    • 28 pin QFN (5x5mm)
  • Applications
    • Standalone USB hub
    • NB / Tablet / Motherboard / Docking Station
    • Gaming console
    • LCD monitor hub
    • Any compound device to support USB hub function

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