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This user manual is for the USB3340 USB Transceiver Evaluation Board (EVB) for use with USB3340
products with the integrated USB switch.
The USB3340 features a ULPI interface to support systems with USB Host, Device, or On-the-Go
(OTG) capability. The integrated switch can be used to multiplex a Full Speed USB signal or audio
signals over the HS USB DP/DM pins.
2 Overview
The USB3340 EVB is a Daughter Card designed to plug into a user's test system using a T&MT
connector. The card attaches to a USB link layer to create a USB Host, Device, or On-the-Go (OTG)
system. The board edge connector meets the UTMI+ Low Pin Interface (ULPI) Standard requirements
for the T&MT connector.
A link to the ULPI Working Group Page is available at www.smsc.com or may be obtained from your
local FAE. The USB3340 EVB includes USB3340 packaged silicon and all external components
required for the USB transceiver function.
This manual describes PCB assembly PCB-7220AZ.
EVB-USB3340 USB Transceiver Evaluation Board User Manual
2.1 Supplying VBUS Voltage
In Host or OTG operation, the USB3340 EVB must provide 5 Volts on V
USB3340 EVB includes a switch that can drive V
of the T&MT connector.
The VBUS switch is controlled by the CPEN signal from the USB3340. The USB controller dictates
the state of CPEN by programming the ULPI register in the USB3340. The 5 Volt switch is backdrive
protected when in the off state. The switch does not provide protection from reverse currents when it
is on. See Section 2.10 and Section 2.11 for more information on configuring the USB3340 EVB for
OTG and Host operation.
2.2 ULPI I/O Voltage
The USB3340 supports variable ULPI I/O voltage signaling. The ULPI I/O voltage is supplied in one
of two ways. By default, the EVB is shipped with VDDIO supplied by the on-board LDO.
Resistor R18 is used to set VDDIO, the digital logic high voltage. To change the value of VDDIO,
calculate a new value for R18 (ohms) as follows.
R18 = (VDDIO/1.225-1) x 169000
VDDIO must be in the range of 1.8 Volts - 3.3 Volts nominal.
VDDIO can also be supplied to the USB3340 from the T&MT connector instead of using the LDO. To
do this, the LDO (U10) must be removed.
at the USB connector. The
using the 5 Volt supply that comes from pin 28
BUS
BUS
The VDDIO voltage level that has been configured on the USB3340 EVB must be the same as the
ULPI I/O voltage level that the link is using.
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EVB-USB3340 USB Transceiver Evaluation Board User Manual
2.3 Edge Connector for Digital I/O
The T&MT edge connector is compliant to the ULPI specification. Part numbers and manufacturers for
this connector and it’s mate are given in Table 2.1.
Table 2.1 Edge Connector on the USB3340 EVB
PART NUMBERDESCRIPTIONMANUFACTURER
2-557101-5100 pin edge connector on USB3340 EVBAMP
2-557-101-5Mating connector to the USB3340 EVBAMP
1-1734037-0Alternate 100 pin edge connector for USB3340 EVBTYCO
1-1734099-0Alternate mating connector to the USB3340 EVBTYCO
2.4 REFCLK Frequency Selection
The USB3340 EVB offers a user selectable reference clock frequency. R25 - R30 are used to configure
the REFCLK[2:0] signals which will select the reference clock frequency desired on the USB3340 EVB.
Ensure that the frequency of the reference clock or reference crystal being used matches the desired
operation frequency configured based on Table 2.2 below. By default, the USB3340 EVB is configured
for 26MHz REFCLK operation.
Table 2.2 Reference Frequency Selection Resistor Configurations
A standard Mini-AB connector is provided to attach a USB cable or connector. Provision is made on
the PCB to accept a Micro-AB connector. See the bill of materials in Section 6 for connector part
numbers. Do not substitute a different part number for the Mini-AB receptacle or a short circuit of the
USB signals may result at the micro-AB connector PCB footprint.
2.6 VBUS Present Detection
The USB controller must detect VBUS when a USB cable is attached in device mode or when the USB
controller turns on VBUS in host or OTG mode. The USB connector VBUS signal is connected to the
VBUS pin of the USB3340. The USB3340 includes all of the comparators required to detect VBUS and
report the state of VBUS to the USB controller via the ULPI bus.
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EVB-USB3340 USB Transceiver Evaluation Board User Manual
2.7 ULPI Signal Test Points
Probe points at location J2, provide access to all ULPI signals. Install the Tektronix logic analyzer probe
retention kit at J2 to probe these signals. Ordering information for the retention kit is provided in the
bill of materials.
2.8 Other Signal Test Points
There are five other test points located on the board for easy access. TP1 connects to the 5V supply
coming from the T&MT connector. TP2 connects to the 3.3V VDD supply coming from the T&MT
connector. TP3 connects to Ground. TP4 and TP5 connect to the Speaker Left and Speaker Right pins
respectively.
2.9 Speaker Left and Speaker Right signals
The Speaker Left and Speaker Right pins can accept audio signals ranging from 0V to 3.3V. If the
audio signal coming into the test points goes below 0V, biasing circuitry is required. Install R11, R14,
R15, and R16 with 10k resistors to add a DC bias to the audio signal. This will ensure the best signal
quality when routing through the USB3340.
2.10 Converting the EVB to an OTG System
“Out of the box”, the USB3340 EVB is delivered as a USB Device system. To convert it to be a USB
OTG development board, the following modifications must be made:
1. Install R13 (zero ohm resistor). This connects the VBUS 5V switch to the VBUS signal.
2. Remove R23. This is the R
3. Install R10 (1.0K, 1W resistor). This is the R
Since the USB3340 is designed to accommodate up to 30V on VBUS, R10 is rated at 1W to
accommodate this entire voltage range. Refer to the USB3340 datasheet for more information on sizing
this resistor.
value required for a USB Device.
VBUS
value required for a USB OTG Device.
VBUS
2.11 Converting the EVB to a Host System
“Out of the box”, the USB3340 EVB is delivered as a USB Device System. To convert it to be a USB
Host development board, the following modifications must be made:
1. Install R13 (zero ohm resistor). This connects the VBUS 5V switch to the VBUS signal.
2. Install C24 (120uF capacitor). This increases the value of C
to be USB 2.0 Host compliant.
VBUS
2.12 Converting the EVB to Support ULPI Clock Input Mode
“Out of the box”, the USB3340 EVB uses a crystal (Y1) as the clock reference, and is configured for
ULPI Clock Output Mode where CLKOUT sources a 60MHz clock. To convert the EVB to support ULPI
Clock Input Mode, the following changes must be made:
1. Install R12 (zero ohm resistor). This shorts CLKOUT to VDD18.
2. Install R3 (zero ohm resistor). This shorts REFCLK to the System Clock pin on the T&MT
connector.
3. Confirm that R4 is not populated.
4. Remove the following components to remove the crystal circuit: Y1, R17, C22, C23
Refer to the USB3340 datasheet for more information on ULPI Clock Input Mode.
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2.13 T&MT Pin Description
The T&MT signal names, pin number and function are described in Table 43 and Table 44 of the ULPI
Specification rev 1.1.
The USB3340 EVB fully implements a ULPI compliant interface to the T&MT connector, including
support for ULPI Clock Input Mode. This EVB supports a 1.8-3.3V ULPI I/O voltages. All signals are
described in Table 2.3.
Table 2.3 T&MT Connector Pin Definitions
PINNAMEDESCRIPTIONDIRECTION
86, 36,
85, 34,
83, 33,
82, 31
96STPULPI STP SignalINPUT TO
70DIRULPI DIR SignalOUTPUT
71NXTULPI NXT SignalOUTPUT
90CLKOUTULPI Clock SignalOUTPUT
55VBUS_FAULT_NDriven low by the VBUS switch (U2) in the event of a
15SPKR_LIn USB Audio mode, SPKR_L is connected to the DP
45SPKR_RMIn USB Audio mode, SPKR_RM is connected to the
17RESETAsserting RESET will place the USB3340 in a low
47VBUS_INThis pin is not connectedNO CONNECT
DATA[7:0]
Refer to Schematic for
Connector Pin Assignment
ULPI Data BusIN/OUT
EVB
FROM EVB
FROM EVB
FROM EVB
OUTPUT
switch fault condition.
IN/OUT
pin via an analog switch in the USB3340.
IN/OUT
DP pin via an analog switch in the USB3340.
INPUT
power state. Upon exiting this state (RESET=0), all
ULPI registers will contain power-on reset values.
28VBUS_OUT+5V from the T&MT connector INPUT TO
8,
16, 57,
69
52SYSTEM_CLOCKOptional clock input to EVB. The EVB is built with the
100PSU_SHD_NThis pin is driven low indicating that +3.3V must be
49DC_PSNT_NThis pin is driven low indicating a daughter card is
SMSC USB3340 EVB5Revision 1.1 (12-14-10)
VDD+3.3V from the T&MT connectorINPUT TO
USB3340 REFCLK provided by a crystal. See
Section 2.12 for more information on configuring the
USB3340 EVB for ULPI Clock Input mode.
sourced from the link through the T&MT connector
pins 8, 16, 57, 69 and +5.0V must be sourced from the
link through the T&MT connector pin 28.
present.
EVB
EVB
NO CONNECT
(input to EVB if
R3 is installed)
OUTPUT
FROM EVB
OUTPUT
FROM EVB
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3 Getting Started
VBUS Switch
ULPI Signals
VBUS
ID
DP
DM
J1
100-pin
T&MT
2.2uF
150uF
ONA
FAULTAn
VDD3.3
+5V
DP
DM
ID
ULPI Bus
GND
Install C20=150uF if host
operation is desired
RESETB
VDD1p8
VDD3p3
VBAT
1.0uF
1.8V
LDO
XI
EXT_VBUS_DET
USB3340
RESET
PCB can accept Micro-AB
Or Mini-AB receptacle
CPEN
XO
VDDIO
VARIABLE
VDDIO
REG
REFSEL[2:0]
USER
REFCLK
CONFIG
The block diagram in Figure 3.1 gives a simplified view of the USB3340 EVB. The USB3340 EVB is
ready for device operation. To modify the board for OTG or Host applications, refer to Section 2.10 or
Section 2.11, respectively.
It is required to provide +5V to T&MT connector pin 28 and +3.3V on T&MT pins 8,16,57,69 to power
the USB3340 EVB.
The USB3340 EVB is built with a USB Mini-AB receptacle. Do not substitute a Mini-AB receptacle
different from the one specified in the bill of materials, or a short circuit may occur on the USB signals
at the Micro-AB connector PCB footprint.
EVB-USB3340 USB Transceiver Evaluation Board User Manual
When the USB3340 EVB is powered on, check the following things to be certain the board is
functioning normally:
RESET should be de-asserted (logic low at the T&MT connector and RESETB at the USB3340
Figure 3.1 Block Diagram of USB3340 EVB
should be logic high = VDD18). If RESETB=0, the USB3340 will be in a low power state.
The voltage at R2 (RBIAS) should be 0.8V DC. If this voltage is not present, the USB3340 is in a
low power state.
There should be a digital 60 MHz square wave signal at T&MT connector pin 90. The amplitude
should be approximately VDDIO. This is the CLKOUT signal of the USB3340.
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The voltage at C3 should be approximately 3.3V. This is the USB3340 internal 3.3V voltage
regulator output.
The voltage at C4 should be 1.8V. This is the 1.8V regulator output.
4 Protecting VBUS from Non-Compliant VBUS Voltages
The USB3340 is fully tolerant to VBUS voltages up to 30V. An external resistor on the VBUS line
) is required for the integrated overvoltage protection circuit in the USB3340. R
(R
VBUS
R10 or R23 on the USB3340 EVB. For peripheral and host applications, R
remove R10). For OTG applications, R
is 1K (install R10, remove R23).
VBUS
VBUS
is 10K (install R23,
VBUS
is either
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5 USB3340 EVB Schematic
5
5
4
4
3
3
2
2
1
1
DD
CC
BB
AA
ULPI Testpoints
T&MT Connector
For host applications 120 uF to ground is required on
VBUS to comply with the USB2.0 specification.
DNP
USB3340 32-pin Evaluation Board
This portion of the schematic
shows components needed for
PHY to operate in a HS peripheral
application.
Host / OTG
Peripheral
R13
Zero Ohm
DNP
REFCLK
Source
110
010
26.0 MHz
12.0 MHz
52.0 MHz000
24.0 MHz111
19.2 MHz101
27.0 MHz011
38.4 MHz001
13.0 MHz100
REFSEL[2:0]
DNP
DNP
DNP
For OTG applications, R10 1K resistor should be installed.
For peripheral/host applications, R23 20K resistor should be installed.