USB2412 datasheet(11/27 Pages) SMSC

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2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

SMSC USB2412

Revision 1.3 (12-27-11)

DATASHEET

SUSP_IND /

I/O

Active/Suspend Status LED (suspend indicator): indicates the USB

hub state. See Section 2.5, "Strap Option Pins" for details.

NON_REM0 = 0: SUSP_IND is active high

NON_REM0 = 1: SUSP_IND is active low

negated = unconfigured, or configured and in USB suspend

asserted = hub is configured and is active (i.e., not in suspend)

NON_REM0

Non-removable Port Strap Option: this pin is sampled (in conjunction

with NON_REM1) 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 and 11: ports 1 and 2 are non-removable

See Section 2.5, "Strap Option Pins" for details.

HS_IND

I/O12

Hi-Speed Upstream Port Indicator

Note:

An LED can be attached for visual indication. See Section

2.5, "Strap Option Pins" for details. When an LED is not used,

this pin requires a 50 k

Ω or higher resistor to ground.

negated = the hub is connected at FS

asserted = the hub is connected at HS

XTALIN

ICLKx

24 MHz Crystal Input: this pin connects to either one terminal of the

crystal or to an external 24 MHz clock when a crystal is not used.

CLKIN

External Clock Input: this pin connects to either one terminal of the

crystal or to an external 24 MHz clock when a crystal is not used.

XTALOUT

OCLKx

24 MHz Crystal Output: this is the other terminal of the crystal circuit

with 1.2 V p-p output and a weak (< 1mA) driving strength. When an

external clock source is used to drive XTALIN/CLKIN, leave this pin

unconnected, or use with appropriate caution.

TEST

IPD

Treat as a no connect pin or connect to ground. No trace or signal

should be routed or attached to this pin.

RESET_N

RESET Input: the system can reset the chip by driving this input low,

where the minimum active low pulse is 1

μs.

POWER, GROUND, and NO CONNECTS

CRFILT

VDD Core Regulator Filter Capacitor: this pin can have up to 0.1

μF

low-ESR capacitor to VSS, or be left unconnected.

VDD33

3.3 V Power

PLLFILT

PLL Regulator Filter Capacitor: this pin can have up to 0.1

μF low-ESR

capacitor to VSS, or be left unconnected.

TEST1

This pin must be connected to VSS.

Table 2.2 USB2412 Pin Descriptions (continued)

SYMBOL

BUFFER

TYPE

DESCRIPTION

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