Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC
reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent
rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated
version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
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Revision 1.0 (05-08-07)
PRODUCT PREVIEW
2
SMSC USB3311
Hi-Speed USB Transceiver with 1.8V ULPI Interface - 26MHz Reference Clock
General Description
The USB3311 is a highly integrated Hi-Speed USB2.0 Transceiver (PHY) that supports systems
architectures based on a 26MHz reference clock. It is designed to be used in both commercial and
industrial temperature applications.
The USB3311 meets all of the electrical requirements to be used as a Hi-Speed USB Host, Device, or
an On-the-Go (OTG) device. In addition to the supporting USB signaling the USB3311 also provides
USB UART mode and USB Audio mode.
USB3311 uses the industry standard UTMI+ Low Pin Interface (ULPI) to connect the USB PHY to the
Link. The industry standard ULPI interface uses a method of in-band signaling and status byte transfers
between the Link and PHY, to facilitate a USB session. By using in-band signaling and status byte
transfers the ULPI interface requires only 12 pins.
The USB3311 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
ESD Protection
OTG
Low Jitter
Integrated
PLL
BIAS
RBIAS
DP
DM
Hi-Speed
USB
Transceiver
ULPI
Registers
and State
Machine
Integrated
Power
Management
RESETB
VBAT
VDD33
VDD18
Carkit
ULPI
Interface
STP
NXT
DIR
CLKOUT
SPKR_L
SPKR_R/M
DATA[7:0]
Figure 1 USB3311 Block Diagram
The USB3311 is designed to run with a 26MHz reference clock. By using a reference clock from the
Link the USB3311 is able to remove the cost of a crystal reference from the design.
SMSC USB3311
PRODUCT PREVIEW
3
Revision 1.0 (05-08-07)
Hi-Speed USB Transceiver with 1.8V ULPI Interface - 26MHz Reference Clock
The USB3311 includes a integrated 3.3V LDO regulator to generate its own supply from the
VBAT
pin.
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 USB3311 the
VBAT
and
VDD3.3
pins should be connected together.
The USB3311 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 USB3311 can
charge its battery at more than the 500mA allowed when charging from a USB Host.
The USB3311 also includes support for USB audio modes. The user can program the PHY into UART
or audio mode while in synchronous mode. The USB3311 can only enter these modes when the user
programs the part into these modes.
In USB UART mode, the USB3311
DP
and
DM
outputs will be redefined to transmit on
DM
and to
receive on
DP.
In UART mode the USB3311 can function as a bi-directional transceiver.
In USB audio mode the
DP
pin is shorted to the
SPKR_R/M
pin with a switch. The
DM
pin is shorted
to the
SPKR_L
pin. The user can then initiate audio signaling over the USB cable. In addition to audio
signals, the switches can also be used to connect Full Speed USB from another PHY onto the USB
cable.
Revision 1.0 (05-08-07)
PRODUCT PREVIEW
4
SMSC USB3311
Hi-Speed USB Transceiver with 1.8V ULPI Interface - 26MHz Reference Clock
USB3311 Pin Locations and Descriptions
Package Diagram with Pin Locations
The pinout below is viewed from the top of the package.
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