[Genesys-Logic]

FUNCTION OVERVIEW

The GL651USB is an USB keyboard hub with 1 upstream port and 2 downstream ports. It integrates USB keyboard and hub in a single chip to add extra value to traditional keyboard and lower its total cost. The GL651USB uses an 8-bit RISC-like uC to encode/decode the host commands and to decode the keyboard matrix data. Its 8 generalpurpose I/O(GPIO) pins and the uC-based structure make the implementation of customization very easy. The GL651USB supports 20 drive pins to meet the diversity of keyboard matrix. Besides, 5 GPIO pins support the LED driving, 3 for keyboard and 2 for hub. Hence vendors can decide whether or not to enable the hub LED function easily.

FEATURES

● High performance and low-cost solution for USB keyboard with hub solution

● USB Specification Compliance

- Conforms to USB specification Rev. 1.1

- Conforms to HID Class specification Rev. 1.0

- Supports 1 device address for hub, 1 device address for keyboard

- Supports 2 endpoints of hub, 3 endpoints for keyboard

● 8-bit micro-processor

- RISC-like architecture

- USB optimized instruction set

- Single cycle instruction execution

- Operation Speed: DC to 24 MHz clock input

- Performance: 12 MIPS @ 24MHz

● I/O ports

- Up to 20 output pins for key matrix drive pin

- Up to 8 input pins for key matrix sense pin

- Up to 5 I/O pins with LED drive capability : 3 for keyboard, 2 for hub

- Up to 8 general purpose I/O pins for customization

● Internal memory

- 80 bytes of RAM

- 3.25K ´ 14 of program ROM

- larger size of ROM makes it possible for customization

● On-chip 3.3v output

- No external regulator required

● Integrated USB transceiver

● 12 MHz external clock

● Improved output drivers with slew-rate control to reduce EMI

● Internal power-on reset(POR)

● Internal power-fail detector for ESD recovery

● Support suspend/normal mode power management

● Remote wakeup is supported for both keyboard and hub

● Support power management for downstream port devices

● Automatic switching between self/bus powered mode

● Smart LED traffic indicator

- The higher data traffic flows through the hub downstream port, the higher frequency that port’s LED will blink.

● 100 pin LQFP package for demo, COB structure is supported