USB2512I datasheet(9/37 Pages) SMSC

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Industrial Temperature Rated USB 2.0 High-Speed 2-Port Hub Controller

Datasheet

SMSC USB2512i

Revision 1.92 (11-28-07)

DATASHEET

SERIAL PORT INTERFACE

SDA/

SMBDATA/

NON_REM1

I/OSD12

Serial Data / SMB Data & Port Non Removable Strap Option

NON_REM1: Non removable port strap

option.

If this strap is enabled by package and configuration settings

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

with LOCAL_PWR/SUSP_IND/NON_REM0) at RESET_N

negation to determine if imports [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 nonremovable.

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

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

SCL/

SMBCLK/

CFG_SEL0

I/OSD12

Serial Clock (SCL)

SMBus Clock (SMBCLK)

Configuration Select_SEL0: The logic state of this multifunction

pin is internally latched on the rising edge of RESET_N

(RESET_N negation), and will determine the hub configuration

method as described in Table 3.2, "SMBus or EEPROM

Interface Behavior".

HS_IND/

CFG_SEL1

I/O12

High-Speed Upstream port indictor & Configuration

Programming Select

HS_IND: High Speed Indicator for upstream port connection

speed.

The active state of the LED will be determined as follows:

CFG_SEL1 = ‘0’,

HS_IND is active high,

CFG_SEL1 = ‘1’,

HS_IND is active low,

‘Asserted’ = Hub is connected at HS

‘Negated’ = Hub is connected at FS

CFG_SEL1: The logic state of this pin is internally latched on

the rising edge of RESET_N (RESET_N negation), and will

determine the hub configuration method as described in

Table 3.2, "SMBus or EEPROM Interface Behavior".

MISC

XTAL1/

CLKIN

ICLKx

Crystal Input/External Clock Input

24MHz crystal or external clock input.

This pin connects to either one terminal of the crystal or to an

external 24MHz clock when a crystal is not used.

Table 3.1 USB2512i Pin Descriptions (continued)

SYMBOL

QFN-36

EMB

BUFFER

TYPE

DESCRIPTION

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