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PDF AU9254A21 Data sheet ( Hoja de datos )

Número de pieza AU9254A21
Descripción USB Hub Controller
Fabricantes ETC 
Logotipo ETC Logotipo



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AU9254 A21
USB Hub Controller
Technical Reference Manual
Revision 1.1
© 1997-2003 Alcor Micro Corp.
All Rights Reserved

1 page




AU9254A21 pdf
1.0 Introduction
1.1. Description
The AU9254A21 is an integrated single chip USB hub controller designed for the emerging
industry-standard Universal Serial Bus (USB). The AU9254A21 supports four USB
downstream ports. Each downstream port has power switch control, and over-current
sensing.
Single chip integration makes the AU9254A21 the most cost effective stand-alone USB
hub solution available in the market. Downstream ports can be used to connect various
USB peripheral devices, such as USB printers, modems, scanners, cameras, mice, or
joysticks to the system without adding external glue logic.
1.2. Features
Fully compliant with the Universal Serial Bus Specification, version 1.1.
USB hub design is compliant with Universal Serial Bus Hub Specification, revision
1.1.
Single chip integrated USB hub controller with embedded proprietary processor.
Supports four bus-powered/self-powered downstream ports.
Built-in 3.3v voltage regulator allows single +5V operating voltage, resulting in
reduced overall system cost.
Runs at 12Mhz frequency.
28-pin SSOP package, both normal size (body size 209 mil) and smaller size (body
size 150 mil) are available.
INTRODUCTION
1

5 Page





AU9254A21 arduino
16 SUSPEND
17 DP2_OVRCUR
18 NC
19 AGND/GNDO
20 XTAL_1
21 XTAL_2
22 DP3_PWRUP
23 DP4_OVRCUR
24 DP3_OVRCUR
25 USB_DM
26 USB_DP
27 USB1_DM
28 USB1_DP
Output
Input
Device is in suspended state: Active high.
Downstream port 2 over-current indicator. Active
low.
Power
+5 V power supply.
Input
Crystal in.
Output
Crystal out.
Output
Downstream port 3 power switch control. Active
low.
Input
Downstream port 4 over-current indicator. Active
low.
Input
Downstream port 3 over-current indicator. Active
low.
Input/Output USB D- for upstream.
Input/Output USB D+ for upstream port. Need external 1.5K
pull-up to 3.3V.
Input/Output USB D- for downstream port 1; add 15Kpull-down
to ground.
Input/Output USB D+ for downstream port 1; add 15Kpull-
down to ground.
SYSTEM ARCHITECTURE AND REFERENCE DESIGN
7

11 Page







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