Alcor Micro AU9412EEP Product manual

AU9412EEP
USB Keyboard/Hub Controller
Technical Reference Manual
Revision 1.03
© 1998 Alcor Micro Inc.
All rights reserved

Copyright Notice
Copyright 1998
Alcor Micro Inc.
All rights Reserved.
Trademark Acknowledgements
The company and product names mentioned in this document may be the trademarks or registered trademarks of their manufacturers.
Disclaimer
Alcor Micro Inc. reserves the right to change this product without notice.
Alcor Micro Inc. makes no warranty for the use of its products and bears no responsibility for any errors which appear in this
document. Specifications are subject to change without notice.
Contact Information
USA Headquarters Los Angeles
Alcor Micro, Inc. Alcor Micro, Inc.
155A Moffett Park Drive, Suite 240 9400 Seventh St., Bldg. A2
Sunnyvale CA, 94089 Rancho Cucamonga, CA 91730
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]
Taiwan
Alcor Micro Inc. Taiwan
7F, No 279, Sec. 4, Hsin-I Road,
Taipei, Taiwan R.O.C.
Phone: [phone]
Fax: [phone]

TABLE OF CONTENTS i
Table of Contents
1.0 Introduction
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1
1.1. Description .............................................................................................................1
1.2. Features .................................................................................................................1
2.0 Application Block Diagram
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3
3.0 Pin Assignment
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5
4.0 System Architecture and Reference Design
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10
4.1. AU9412EEP Block Diagram..................................................................................10
4.2. Sample Schematics.................................................................................................10
4.3. Sample Key Matrix Layout Table ..........................................................................10
5.0 Electrical Characteristics
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10
5.1. Maximum Ratings..................................................................................................10
5.2. Recommended Operating Conditions.....................................................................10
5.3. Crystal Oscillator Circuit Setup for Characterization.............................................10
5.4. USB Transceiver Characteristics............................................................................10
5.5. ESD Test Results....................................................................................................10
5.6. Latch-Up Test Results............................................................................................10
6.0 Mechanical Information
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10

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INTRODUCTION 1
1.0 Introduction
1.1. Description
The AU9412EEP is an integrated USB keyboard and 2 port hub controller chip. The
AU9412EEP has a built-in default keyboard matrix, so that it can be directly connected to an
18 x 8 keyboard matrix. The keyboard matrix can be customized via an optional external
512-byte serial EEPROM. Downstream ports can be used to connect various USB peripheral
devices, such as USB printers, modems, scanners, cameras, mice, and joysticks, to the system
without adding external glue logic.
Single chip integration makes the AU9412EEP the most cost effective keyboard/hub solution
available in the market.
1.2. Features
•Fully compliant with the Universal Serial Bus Specification, version 1.0
•USB hub design is compliant with Universal Serial Bus Hub Specification, revision 1.1
•USB keyboard design is compliant with USB Device Class Definition for Human
Interface Devices (HID), Firmware Specification, version 1.0
•Single chip integrated USB keyboard/hub controller with embedded proprietary
processor
•Integrated USB hub supports two bus-powered downstream ports
•Patent-pending, table-driven SCANTABLEtechnology for easy customization to
different keyboard matrix
•USB vendor ID, product ID, and keyboard scan code table can be customized via external
EEPROM
•Built-in, cost saving, default scan code table and vendor ID, if customization is not
necessary
•Built-in 3.3v voltage regulator allows single +5V operating voltage drawing directly from
USB bus. This results in reduced overall system cost.
•Optional gang-powered control pin for downstream port.
•Runs at 12Mhz frequency
•Available in 48-pin DIP

2INTRODUCTION
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APPLICATION BLOCK DIAGRAM 3
2.0 Application Block Diagram
The AU9412EEP is a single chip which integrates USB keyboard and hub functionality. The
upstream port is connected to the USB system. The downstream ports can be used for a mouse
and joystick.

4APPLICATION BLOCK DIAGRAM
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PIN ASSIGNMENT 5
3.0 Pin Assignment
The AU9412EEP is a 48-pin dual inline package (DIP). The following figure shows the
signal names for each of the pins on the chip. The table on the following page describes each
of the pin signals.

6 PIN ASSIGNMENT
Table 3-1. Pin Descriptions
Pin # Pin Name I/O Description
1 VCC3.3 O 3.3V output for upstream D+ pull-up; 4 mA
2USB_DP I/O USB D+ for upstream port. Need external 1.5KΩpull-
up to 3.3V
3 USB_DM I/O USB D- for upstream port
4 USB1_DP I/O USB D+ for downstream port 1. Add 15KΩpull-down
to ground