Highly Integrated Full Featured Hi-Speed USB 2.0 ULPI Transceiver
Datasheet
Chapter 1 General Description
The SMSC USB3320 is a Hi-Speed USB 2.0 Transceiver that provides a configurable physical layer
(PHY) solution and is an excellent match for a wide variety of products. Both commercial and industrial
temperature applications are supported.
The frequency of the reference clock is user selectable. The USB3320 includes an internal oscillator
that may be used with either a quartz crystal or a ceramic resonator. Alternatively, the crystal input can
be driven by an external clock oscillator. Another option is the use of a 60MHz external clock when
using the ULPI Input Clock mode.
Several advanced features make the USB3320 the transceiver of choice by reducing both electrical
bill of material (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 USB3320 from voltages up to 30V. By using a reference
clock from the Link, the USB3320 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 USB3320 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 USB3320 also
provides USB UART mode and USB Audio mode.
USB3320 uses the industry standard UTMI+ Low Pin Interface (ULPI) to connect the USB Transceiver
to the Link. ULPI uses a method of in-band signaling and status byte transfers between the Link and
transceiver to facilitate a USB session with only 12 pins.
The USB3320 uses SMSC’s “wrapper-less” technology to implement the ULPI interface. This “wrapper-
less” technology allows the transceiver 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.
REFCLK XO
REFSEL[2:0]
Crystal
Oscillator and
Low Jitter
Integrated
PLL
CPEN
VBUS
ID
OTG
RBIAS
BIAS
RESETB
VBAT
VDD33
VDD18
Integrated
Power
Management
Hi-Speed
USB
Transceiver
DP
DM
ULPI
VDDIO
Registers
and State
Machine
STP
NXT
DIR
CLKOUT
USB
DP/DM
Switch
ULPI Interface
DATA[7:0]
Figure 1.1 USB3320 Block Diagram
Revision 1.0 (07-14-09)
8
SMSC USB3320
DATASHEET
SMSC [ SMSC CORPORATION ]
