USB2512I datasheet(11/37 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

Configured as an SMBus slave for external download of user-defined

descriptors.

SMBus slave address 58 (0101100x)

Strap Options Disabled

All Settings Controlled by Registers

Internal Default Configuration

Strap Options Enabled

Bus Power Operation

2-Wire I2C EEPROMS are supported.

Strap Options Disabled

All Settings Controlled by Registers

Table 3.3 USB2512i Power, Ground, and No Connect

PACKAGE SYMBOL

36-QFN EMB

FUNCTION

VDD18

VDD Core

This pin must have a 1.0

μF (or greater) ±20% (ESR <0.1Ω) capacitor to

VSS.

VDD33PLL

VDD 3.3 PLL Regulator Reference

+3.3V power supply for the PLL. If the internal PLL 1.8V regulator

is enabled, then this pin acts as the regulator input.

VDDPLL18

VDD PLL

This pin must have a 1.0

μF (or greater) ±20% (ESR <0.1Ω) capacitor to

VSS.

VDDA33

VDD Analog I/O

+3.3V Filtered analog PHY power, shared between adjacent ports.

VDD33/VDD33CR

VDDIO/VDD 3.3 Core Regulator Reference

+3.3V power supply for the Digital I/O

If the internal core regulator is enabled, then VDD33CR acts as the

regulator input.

No Connect

Leave unconnected on the circuit board.

Table 3.2 SMBus or EEPROM Interface Behavior (continued)

CFG_SEL1

CFG_SEL0

SMBUS OR EEPROM INTERFACE BEHAVIOR

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