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參數(shù)資料
| 型號： | W-2 |
| 元件分類： | 保險絲 |
| 英文描述： | Fuse |
| 中文描述： | 保險絲 |
| 文件頁數(shù)： | 4/18頁 |
| 文件大?。?/td> | 211K |
| 代理商： | W-2 |
Preliminary W81181D/AD
- 4 -
1. GENERAL DESCRIPTION
W81181D, an high integrated 4 port USB hub controller which integrates a microcontroller,
implements a medium speed (12 MHz) and slow speed (1.5 MHz) Universal Serial Bus (USB) hub
control interface. It supports one upstream, four downstream ports and a serial interface. W81181D
can be act as multifunction USB device. For example, the whole system can be designed as an USB
HUB plus an USB mouse or an USB HUB plus an IR receiver, and no down stream port be occupied
as well as no other component needed.
W81181D acts as an USB hub controller and a hub repeater at the direction of an internal
microcontroller. W81181D controls the traffic among the host, four downstream ports, and the
microprocessor. As a hub controller, it can enable/disable ports, send and receive resets, and detect
devices of high or low speeds. The W81181D contains three function endpoints and two hub
endpoints to allow both USB Control and Interrupt Transfers between the host and microcontroller.
W81181D is a compound USB device (hub with embedded function attached) with totally five
downstream ports. W81181D can be used as a hub controller in a standalone hub with attached
function or a microcontroller based USB device with hub function.
Ordering Information
PART NO.
W81181D
W81181AD
INPUT CLOCK Freq.
12 MHz
48 MHz
PACKAGE
48-LQFP
48-LQFP
2. FEATURES
Full compliance with USB spec Rev 1.1 and HID Class Definition Rev 1.0
Compliance with USB Hub spec Rev 1.1
Support multiple endpoints for standalone hub with attached function
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 (W81181D)
48-Mhz oscillator input for motherboard application (W81181AD)
Support Suspend and Resume operation
Four downstream ports with per port overcurrent protection
Two endpoints for hub (Control and Interrupt)
LED display supports bright/blinking alternative for port enable and OCP(over current protection)
flags
Single 5V supplied with embedded 5V-3.3V regulator
Three endpoints for attached device (one Control and two Interrupt)
Provides the external pull-up resistor control for the up-stream connection.
Perport/Global downstream port power control optional
Packaged in 48-pin LQFP
5V CMOS device
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