GL852G Datasheet
CHAPTER 2 FEATURES
Compliant to USB specification Revision 2.0
4 downstream ports
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
Dual cycle instruction execution
Performance: 6 MIPS @ 12MHz
With 64-byte RAM and 9K internal ROM
Support customized PID, VID by reading external EEPROM
Support downstream port configuration by reading external EEPROM
Multiple Transaction translator (MTT)
MTT provides respective TT control logics for each downstream port.
Each downstream port supports two-color status indicator, with automatic and manual modes compliant to
USB specification Revision 2.0
Built-in upstream port 1.5KΩ pull-up and downstream port 15KΩ pull-down resistors
Support both individual and gang modes of power management and over-current detection for
downstream ports
Conform to bus power requirements of USB 2.0 specification
Automatic switching between self-powered and bus-powered modes
Integrate USB 2.0 transceiver
Embedded PLL support external 12 MHz crystal / Oscillator clock input
Optional 27/48 MHz Oscillator clock input (Only available in LQFP48 package)
Support compound-device (non-removable in downstream ports) by I/O pin configuration (Only available
in LQFP48 package)
Number of Downstream port can be configured by GPIO without external EEPROM (Only available in
LQFP48 package)
Built-in 5V to 3.3V regulator
Improve output drivers with slew-rate control for EMI reduction
Internal power-fail detection for ESD recovery
Available package types: 48 pin LQFP, 28 pin QFN and 28 pin SSOP
Applications:
Stand-alone USB hub / USB docking
UMPC/MID, motherboard on-board applications
Consumer electronics built-in hub application
Monitor built-in hub
Embedded systems
Compound device to support USB hub function such as keyboard hub applications
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