USB2422SLASHMJ datasheet(11/51 Pages) SMSC

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2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

SMSC USB2422

Revision 1.0 (06-04-13)

DATASHEET

2.3

Pin Descriptions (Grouped by Function)

Table 2.2 USB2422 Pin Descriptions

SYMBOL

BUFFER

TYPE

DESCRIPTION

UPSTREAM USB 2.0 INTERFACES

USBDM_UP

USBDP_UP

IO-U

USB Bus Data:

Connect to the upstream USB bus data signals (host, port, or

upstream hub).

VBUS_DET

Detect Upstream VBUS Power:

Detects the state of upstream VBUS power. The SMSC hub monitors

VBUS_DET to determine when to assert the internal D+ pull-up

resistor (signalling a connect event)

When designing a detachable hub, this pin should be connected to

VBUS on the upstream port via a 2:1 voltage divider. Two 100 k

resistors are suggested.

For self-powered applications with a permanently attached host, this

pin must be connected to a dedicated host control output, or

connected to the 3.3 V domain that powers the host (typically VDD33).

DOWNSTREAM USB 2.0 INTERFACES

and

USBDP_DN[2:1]/

PRT_DIS_P[2:1]

and

USBDN_DN[2:1]/

PRT_DIS_M[2:1]

IO-U

Hi-Speed USB Data:

Connect to the downstream USB peripheral devices attached to the

hub’s ports.

Port Disable Strap Option:

If this strap is enabled by package and configuration settings (see

Table 4.1, "Hub Configuration Options"), this pin will be sampled at

RESET_N negation to determine if the port is disabled.

Both USB data pins for the corresponding port must be tied to VDD33

to disable the associated downstream port.

PRTPWR1/

O12

USB Power Enable:

Enables power to USB peripheral devices that are downstream, where

the hub supports active high power controllers only.

BC_EN1

IPD

Battery Charging Strap Option:

Port 1 pin will be sampled at RESET_N negation to determine if port

1 supports the battery charging protocol (and thus the supporting

external port power controllers) that would enable a device to draw the

currents per the USB Battery Charging Specification.

This pin has an internal pull-down that will be removed after the strap

option hold time is completed.

BC_EN1= 1: Battery charging feature is supported for port 1

BC_EN1= 0: Battery charging feature is not supported for port 1

PRTPWR2

O12

USB Power Enable:

Enables power to USB peripheral devices that are downstream, where

the hub supports active high power controllers only.

OCS1_N

OCS2_N

IPU

Over-Current Sense:

Input from external current monitor indicating an over-current

condition. This pin contains an internal pull-up to the 3.3 V supply.

USB2422/MJ 数据表(PDF) 11 Page - SMSC Corporation

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