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 supportedPinout
Specifications
|
SYMBOL |
Characteristic |
Value |
Unit |
| TSTG |
Storage temperature |
-55 to +150 |
°C |
| TOP |
Operating temperature |
0 to +70 |
°C |
|
VCC |
Supply voltage |
-0.5 to +7.0 |
V |
|
|
DC input voltage |
--0.5 to +VDD + 0.5 |
V |
|
I |
Maximum current per pin excluding VDD and VSS |
25 |
mA |
|
I MGND |
Maximum current out of GND |
100 |
mA |
|
I MVCC |
Maximum current out of VCC |
-100 |
mA |
|
VESD |
static discharge voltage |
>4000 |
V |
Maximum ratings are the extreme limits to which the GL651USB can be exposed without permanently damaging it. The GL651USB contains circuitry to protect the inputs against damage from high static voltages; however, do not apply voltages higher than those shown in the table. Keep VIN and VOUT within the range GND (VIN or VOUT) VCC. Connect unused inputs to the appropriate voltage level, either GND or VDD.
DescriptionThe 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. For giving more design flexibility, the power supply of GL651USB can be switched automatically: self-power or bus-power. In the same way, vendors can pullup/pulldown the SELF pin to support only self/bus power if they have cost issue. The GL651USB can be configured as ganged/individual mode for hub functions by strapping through pullup/p ulldown the SUSPND pin. To prevent from abnormal current consumption of downstream port devices, the GL651USB supplies power enable flags by reading the over-current flags. By hub LED, The GL651USB also supports smart traffic indication, i.e., the higher data traffic flows through one port, the higher frequency of that port's LED blinks. In order to minimize the power consumption, the GL651USB will turn LED off and stop the clock automatically when it is suspended.
The GL651USB is the most featured and flexible product for those venders who are looking for "USB Keyboard with Hub" solution. Besides, vendors can easily modify their board circuits to meet their own requirement if they have product differentiation or cost issues. Further more, if vendor has the requirement of saving their package cost, COB component also can be supplied by request.
GL651USB Data Sheet
