Miniature Hi-Speed USB Transceiver with 1.8V ULPI Interface

SMSC USB332x

3

Revision 0.3 (02-04-08)

PRODUCT PREVIEW

General Description

SMSC’s USB332x is a family of Hi-Speed USB 2.0 Transceivers that provides a physical layer (PHY)

solution well-suited for portable electronic devices. Both commercial and industrial temperature

applications are supported.

Each model in the USB332x family may use a 60MHz reference clock, or the model-number specific

reference clock shown in ORDER NUMBER(S): on page 2.

Several advanced features make the USB332x the transceiver of choice by reducing both eBOM part

count and printed circuit board (PCB) area. Outstanding ESD robustness eliminates the need for

external ESD protection devices in typical applications. The internal Over-Voltage Protection circuit

(OVP) protects the USB332x from voltages up to 30V. By using a reference clock from the Link, the

USB332x removes the cost of a dedicated crystal reference from the design. And the integrated USB

switch enables unique product features with a single USB port of connection.

The USB332x meets all of the electrical requirements to be used as a Hi-Speed USB Host, Device, or

an On-the-Go (OTG) transceiver. In addition to the supporting USB signaling, the USB332x also

provides USB UART mode and USB Audio mode.

USB332x uses the industry standard UTMI+ Low Pin Interface (ULPI) to connect the USB PHY to the

Link. ULPI uses a method of in-band signaling and status byte transfers between the Link and PHY to

facilitate a USB session with only 12 pins.

The USB332x uses SMSC’s “wrapper-less” technology to implement the ULPI interface. This “wrapper-

less” technology allows the PHY to achieve a low latency transmit and receive time. SMSC’s low

latency transceiver allows an existing UTMI Link to be reused by adding a UTMI to ULPI bridge. By

adding a bridge to the ASIC the existing and proven UTMI Link IP can be reused.

Figure 1 USB332x Block Diagram

OTG

USB

DP/DM

Switch

Hi-Speed

USB

Transceiver

ULPI

Interface

ULPI

Registers

and State

Machine

BIAS

Low Jitter

Integrated

PLL

Integrated

Power

Management

VBUS

ID

DP

DM

RBIAS

REFCLK

DATA[7:0]

RESETB

VDD18

VDD33

VBAT

DIR

NXT

STP

CLKOUT

OVP