USB3503 datasheet(16/82 Pages) SMSC

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USB 2.0 HSIC High-Speed Hub Controller Optimized for Portable Applications

Datasheet

SMSC USB3503A

Revision 1.1 (02-07-13)

DATASHEET

RESET Input

RESET_N

This active low signal is used by the system to

reset the chip and hold the chip in low power

STANDBY MODE.

USB Transceiver Bias

RBIAS

A-I/O

A 12.0k

Ω (+/- 1%) resistor is attached from ground

to this pin to set the transceiver’s internal bias

settings.

Hub Connect

HUB_CONNECT

Hub will transition to the Hub Communication

Stage when this pin is asserted high. It can be

used in three different ways:

Tied to Ground - Hub will not transition to the Hub

Communication Stage until connect_n bit of the

SP_ILOCK register is negated.

Tied to VDD33_BYP - Hub will automatically

transition to the Hub Communication Stage

regardless of the setting of the connect_n bit and

without pausing for the SOC to reference status

registers.

Transition from low to high - Hub will transition to

the Hub Communication Stage after this pin

transitions from low to high. HUB_CONNECT

should never be driven high when USB3503 is in

Standby Mode.

POWER

1.2V VDD Power

VDD12_BYP

Power

1.2 V Regulator. A 1.0

μF (<1

Ω ESR) capacitor

to ground is required for regulator stability. The

capacitor should be placed as close as possible to

the USB3503.

3.3V VDD Power

VDD33_BYP

Power

3.3V Regulator. A 4.7

μF (<1

Ω ESR) capacitor to

ground is required for regulator stability. The

capacitor should be placed as close as possible to

the USB3503.

Core Power Supply Input

VDD_CORE_REG

Power

Power supply to 1.2V regulator.

This power pin should be connected to

VDD33_BYP for single supply applications.

Refer to Chapter 9 for power supply configuration

options.

Battery Power Supply Input

VBAT

Power

Battery power supply.

Refer to Chapter 9 for power supply configuration

options.

VSS

Ground

Table 3.1 Pin Descriptions (continued)

NAME

SYMBOL

TYPE

DESCRIPTION

USB3503 Datasheet(PDF) 16 Page - SMSC Corporation

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