USB2512 datasheet(10/37 Pages) SMSC

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USB 2.0 High-Speed 2-Port Hub Controller

Datasheet

SMSC USB2512

Revision 1.92 (11-28-07)

DATASHEET

XTAL2

OCLKx

Crystal Output

24MHz Crystal

This is the other terminal of the crystal, or a NO-CONNECT

when an external clock source is used to drive XTAL1/CLKIN.

This output must not be used to drive any external circuitry

other than the crystal circuit.

RESET_N

RESET Input

The system can reset the chip by driving this input low. The

minimum active low pulse is 1 us.

When the RESET_N pin is pulled to VDD33, the internal POR

(Power on Reset) is enabled and no external reset circuitry is

required. The internal POR holds the internal logic in reset until

the power supplies are stable.

SUSP_IND/

LOCAL_PWR/

NON_REM0

I/O

Active/Suspend status LED or Local-Power & Non Removable

Strap Option

Suspend Indicator: Indicates 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 Power: Detects availability of local self-power source.

Low = Self/local power source is NOT available (i.e., Hub gets

all power from Upstream USB VBus).

High = Self/local power source is available.

NON_REM0 Strap Option:

If this strap is enabled by package and configuration settings

(see Table 3.2), this pin will be sampled (in conjunction with

NON_REM1) at RESET_N negation to determine if ports [2:1]

contain permanently attached (non-removable) devices. Also,

the active state of the LED

will be determined as follows:

NON_REM[1:0] = ‘00’, All ports are removable, and the LED is

active high

NON_REM[1:0] = ‘01’, Port 1 is nonremovable, and the LED is

active low

NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable, and the

LED is active high

NON_REM[1:0] = ‘11’, Ports 1 & 2 are non-removable, and the

LED is active low

TEST

IPD

TEST pin

Used for testing the chip. User must treat as a no-connect or

connect to ground.

Table 3.2 SMBus or EEPROM Interface Behavior

CFG_SEL1

CFG_SEL0

SMBUS OR EEPROM INTERFACE BEHAVIOR

Internal Default Configuration

Strap Options Enabled

Table 3.1 USB2512 Pin Descriptions (continued)

SYMBOL

QFN-36

EMB

BUFFER

TYPE

DESCRIPTION

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