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Revision 1.1 (11-20-12)
PRODUCT PREVIEW
2
SMSC USB332x
Industry’s Smallest Hi-Speed USB Transceiver with 1.8V ULPI Interface
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 Numbers on page 2.
Several advanced features make the USB332x 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 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.
REFCLK
VBUS
ID
OVP
ESD Protection
OTG
Low Jitter
Integrated
PLL
BIAS
RBIAS
DP
DM
Hi-Speed
USB
Transceiver
USB
DP/DM
Switch
ULPI
Registers
and State
Machine
Integrated
Power
Management
RESETB
VBAT
VDD33
VDD18
ULPI
Interface
STP
NXT
DIR
CLKOUT
SPK_L
SPK_R
DATA[7:0]
Figure 1 USB332x Block Diagram
SMSC USB332x
PRODUCT PREVIEW
3
Revision 1.1 (11-20-12)
Industry’s Smallest Hi-Speed USB Transceiver with 1.8V ULPI Interface
The USB332x includes an integrated 3.3V Low Drop Out (LDO) linear voltage regulator that may
optionally be used to generate 3.3V from power applied at the
VBAT
pin. The voltage on the
VBAT
pin can range from 3.1 to 5.5V. The regulator dropout voltage is less than 100mV which allows the
PHY to continue USB signaling when the voltage on
VBAT
drops to 3.1V. The USB transceiver will
continue to operate at lower voltages, although some parameters may be outside the limits of the USB
specifications. If the user would like to provide a 3.3V supply to the USB332x, the
VBAT
and
VDD33
pins should be connected together.
The USB332x also includes integrated pull-up resistors that can be used for detecting the attachment
of a USB Charger. By sensing the attachment to a USB Charger, a product using the USB332x can
charge its battery at more than the 500mA allowed when charging from a USB Host.
In USB UART mode, the USB332x
DP
and
DM
pins are redefined to enable pass-through of
asynchronous serial data. The USB332x can only enter UART mode when the user programs the part
into this mode.
In USB audio mode, a switch connects the
DP
pin to the
SPK_R
pin, and another switch connects he
DM
pin to the
SPK_L
pin. The USB332x can be configured to enter USB audio mode. In addition,
these switches are on when the
RESETB
pin of the USB332x is asserted. The USB audio mode
enables audio signalling from a single USB port of connection, and the switches may also be used to
connect Full Speed USB from another PHY onto the USB cable.
Revision 1.1 (11-20-12)
PRODUCT PREVIEW
4
SMSC USB332x
Industry’s Smallest Hi-Speed USB Transceiver with 1.8V ULPI Interface
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