W81
2
82F
USB Keyboard Controller
with
4 Ports Hub
W81282F Data Sheet Revision History
Pages
Dates
Version Version
on Web
Main Contents
1
n.a.
08/27/99
0.50
n.a.
First published.
2
3
4
5
6
7
8
9
10
Please note that all data and specifications are subject to change without notice. All
the trade marks of products and companies mentioned in this data sheet belong to
their respective owners.
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or
systems where malfunction of these products can reasonably be expected to result
in personal injury. Winbond customers using or selling these products for use in such
applications do so at their own risk and agree to fully indemnify Winbond for any
damages resulting from such improper use or sales.
W81282F
Preliminary
Publication Release Date: Aug. 199
9
- 1 -
Revision 0.5
TABLE OF CONTENTS
1. GENERAL DESCRIPTION
.................................................................................................................1
2.
APPLICATION BLOCK DIAGRAM
....................................................................................................1
3. FEATURES ............................................................................................................................................2
4. PIN CONFIGURATION
.......................................................................................................................3
5. PIN DESCRIPTION
.............................................................................................................................4
6. ABSOLUTE MAXIMUM RATINGS
....................................................................................................8
7. ELECTRICAL CHARACTERISTICS
..................................................................................................9
8. TYPICAL APPLICATION
.................................................................................................................. 11
9. HOW TO READ THE TOP MARKING
............................................................................................. 13
10. PACKAGE DIMENSIONS
............................................................................................................... 14
W81282F
USB HUB CONTROLLER
Publication Release Date: Aug. 199
9
- 1 -
Revision 0.71
1. GENERAL DESCRIPTION
The W81282F is a highly integrated USB keyboard with 4 port hub controller chip. The W81282F has a
built-in 21X8 default keyboard matrix, so that it can be directly connected to keyboard with multi-media
function matrix. The keyboard matrix, vendor ID, and device ID can be easily customized from an
optional EEPROM or modify firmware to meet any customers' requirement. The 4 USB down-stream
port can be used to connect various USB peripheral devices, such as printer, modem, speaker,
camera, mice, and joystick, to system without any external glue logics. The W81282F use 12MHz
clock input with internal PLL to eliminate EMI effect. The W81282F also built-in ESD/EFT protection
circuit so it can pass ESD/EFT test without any external glue logics.
2.
APPLICATION BLOCK DIAGRAM
KB MATRIX
HOST
4 PORT USB DOWNLINK
W81282F
EEPROM
(Optional)
ID, Matrix Loadable
Volume Control
KB MATRIX
KB MATRIX
HOST
4 PORT USB DOWNLINK
W81282F
EEPROM
(Optional)
ID, Matrix Loadable
Volume Control
W81282F
PRELIMINARY
Publication Release Date: Aug. 199
9
- 2 -
Revision 0.5
3. FEATURES
Full compliance with USB spec Rev 1.
1
and HID Class Definition Rev 1.0
Embedded microprocessor--8052 ( 6K ROM + 256 Byte RAM)
Support auto-detected two power source mode between bus power mode and self power mode.
12-Mhz crystal/oscillator input to lower EMI
Support Suspend and Resume operation
Support ACPI features
Four downstream ports with per port over-current protection
Single 5V supplied with embedded 5V-3.3V regulator
Provides the external pull-up resistor control for the up-stream connection.
Per-port/Global power control optional
Built-in ESD/EFT protection circuit
Support 21 X 8 keyboard matrix
Support consumer control function for multi-media
Support optional EEPROM for vendor ID, device ID, and KB matrix down load
Support encoder input for audio volume control
Provide the external pull-up resistor control for the up-stream connect
100-pin PQFP
5V CMOS device
PDF 
ZIP