USB2422SLASHMJ datasheet(13/51 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

SUSP_IND

I/O12

Suspend Indicator:

Indicates the USB state of the hub.

negated : unconfigured, or configured and in USB Suspend

asserted : Hub is configured, and is active (i.e., not in suspend)

LOCAL_PWR

Local Power:

This input selects whether the hub reports itself as bus or self-powered

when dynamic power switching is enabled via the Dynamic Power

Enable (DYNAMIC) bit of the Configuration Data Byte 2 Register

(CFG2). This pin is sampled at POR/Reset before the USB Hub Attach

command is sent. Once the hub has entered the attach state (as

indicated by the USB Attach and Write Protect (USB_ATTACH) bit of

the Status/Command Register (STCD)), this pin cannot be changed.

Low : self/local power source is not available (i.e., the Hub gets all

power from the upstream USB VBus).

High : self/local power source is available.

Note:

Never tie this pin directly to VDD33, as doing so may cause

it to act as SUSP_IND.

Note:

This pin assumes the meaning of local power input only if

properly configured via SMBus. If the hub is configured via

straps, it is NON_REM0 at reset and SUSP_IND after reset.

(NON_REM0)

Non-Removable Port Strap Option:

This pin is sampled (in conjunction with SUSP_IND/NON_REM0) at

RESET_N negation to determine if ports [2:1] contain permanently

attached (non-removable) devices:

NON_REM[1:0] = 00: all ports are removable

NON_REM[1:0] = 01: port 1 is non-removable

NON_REM[1:0] = 10: ports 1 and 2 are non-removable

NON_REM[1:0] = 11: reserved

See Section 2.5, "Strap Pin Configuration" for details.

POWER, GROUND, and NO CONNECTS

VDD33

3.3 V power to the chip.

A 1.0

μF low-ESR capacitor to VSS is required on pin 9 as close as

possible to the pin. A 0.1

μF low-ESR capacitor to VSS is required on

pin 1 as close as possible to the pin.

CRFILT

VDD Core Regulator Filter Capacitor:

This pin requires a 1.0

μF low-ESR capacitor to VSS for proper

operation.

PLLFILT

PLL Regulator Filter Capacitor:

This pin can have up to a 0.1

μF low-ESR capacitor to VSS, or be left

unconnected.

VSS

Ground Pad/ePad:

The package slug is the only VSS for the device and must be tied to

ground with multiple vias.

Table 2.2 USB2422 Pin Descriptions (continued)

SYMBOL

BUFFER

TYPE

DESCRIPTION

USB2422/MJ 数据表(PDF) 13 Page - SMSC Corporation

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