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User manual
STOTG04 USB OTG full-speed
transceiver demonstration board
Introduction
This manual explains how to use and take full advantage of the STOTG04 universal serial
bus (USB) on-the-go (OTG) full-speed transceiver demonstration board, which is designed
to help users evaluate their USB OTG applications. The PC board (PCB) connections make
it possible to test the STOTG04 transceiver while it is connected to the USB OTG controller.
Without the controller, the STOTG04 is configurable through the I2C interface.
The STOTG04 is fully compliant with the USB v2.0 specification and the on-the-go
supplement to this specification (see http://www.usb.org for details). It provides a complete
physical layer (PHY) solution for any USB OTG device. When the STOTG04 is connected to
a USB OTG controller, it is ideal for use with several mobile applications (such as cell
phones, digital cameras, printers and PDAs).
The STOTG04 transceiver is controlled by the "USB OTG Demo" software that runs on
Microsoft Windows operating systems. This software enables designers to configure and
monitor the transceiver’s internal registers.
Figure 1.
November 2008
STOTG04 demonstration board
Rev 2
1/13
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Contents
UM0212
Contents
1
STOTG04 demonstration board hardware . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
STOTG04 power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2
Connecting to a PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3
Jumper assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4
Connector assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4.1
1.5
2
CON3 pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Reset switch (SW1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
USB OTG demonstration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1
Launching the software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2
PC-to-demonstration board communication . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3
STOTG04 registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Appendix A STOTG04 demonstration board schematics . . . . . . . . . . . . . . . . . . 10
Appendix B STOTG04 demonstration board bill of materials. . . . . . . . . . . . . . . 11
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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1
STOTG04 demonstration board hardware
STOTG04 demonstration board hardware
The demonstration board consists of six main parts (see Figure 2 and Figure 3).
●
Power supply pins (VBAT and VIF)
●
Level shifters
●
The STOTG04 full-speed transceiver
●
Configuration jumpers
●
A USB OTG controller connector
●
A reset switch (see Section 1.5).
The STOTG04 needs two types of power supply voltages to function (see Section 1.1). The
battery supply voltage (VBAT) supplies power to the analog functions, and the digital
interface voltage (VIF) supplies power to the digital interface. These supply voltages are
connected to the demonstration board through the power pins.
The board can also be controlled by a PC serial port (see Section 1.2). The RS-232C PC
signal levels are converted to I2C levels by the level shifter block.
The jumpers allow users to test and measure the STOTG04 characteristics without a USB
OTG controller (see Section 1.3).
The USB OTG controller header connector enables the user to connect a USB OTG
controller (see CON3 pin) or any digital control system to the demonstration board. USB or
USB OTG devices can be connected via the mini-AB connector (see Appendix A: STOTG04
demonstration board schematics).
Figure 2.
STOTG04 demonstration board block diagram
Power Pins (VBAT, VIF)
DB-9
Serial Port
Connector
RS232C ↔ I2C
Level Shifters
I2C signals
USB OTG
Controller
Header
Connector
STOTG04
USB OTG
Full-speed
Transceiver
VBUS, DP, DM, ID
Mini-AB
Connector
INT, SUSPEND,
DAT_VP, SE0_VM,
RCV, VM, VP,
RESET, SPEED,
OE_TP_INT
Jumpers
RESET
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Reset
Test points
Jumpers
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Jumpers
STOTG04 Transciver
Test points
RS-232
I2C Level Shifter
Figure 3.
USB OTG controller
header connector
Jumpers Power pins
STOTG04 demonstration board hardware
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Assembled demonstration board PCB
UM0212
STOTG04 demonstration board hardware
Figure 4.
1.1
Demonstration board layout
STOTG04 power requirements
The recommended supply voltages of the transceiver are:
●
VIF = 1.6 V to 3.6 V (VIF = 1.8 V, typ)
●
VBAT = 2.7 V to 5.5 V (VBAT = 3.3 V, typ).
The demonstration board was designed for these same voltage ranges. However, the board
does not contain any voltage regulators, so if only one common supply voltage is used, the
following range is recommended:
VCOMMON = 2.7 V to 3.6 V
Note:
Jumper J7 connecting the VBAT and VIF power supply pins has to be shorted (see Table 1).
1.2
Connecting to a PC
The STOTG04 demonstration board must be connected to the PC serial port via a
non-crossed serial cable. The PC serial port can be selected in the USB OTG
demonstration board software (see Chapter 2).
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STOTG04 demonstration board hardware
1.3
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Jumper assignments
Table 1.
Demonstration board jumper assignments(1)
Jumper Related pin (s)
J1
J2
J3
Enables the differential driver or I2C mode (when
TRANSP_EN Bit = 1)
Open
Interrupt output when SUSPEND = 0 (J2) and SUSPEND Bit = 1
Short
Disables power-down mode when SUSPEND Bit = 1
Open
Enables power-down mode when SUSPEND Bit = 1
Short
Enables low-speed mode operation
Open
Enables full-speed mode operation
Short
Provides power to the VIF pin. Can be used for current
consumption measurement
Open
VIF pin is left floating
Short
Provides power to the VBAT pin. Can be used for current
consumption measurement
Open
VBAT pin is left floating
Short
The lsb of the I2C address is '0'
Open
The lsb of the I2C address is '1'
Short
VBAT = VIF (VCOMMON must be 3.0 V - 3.6 V)
Open
VBAT ≠ VIF (use recommended VBAT and VIF)
Short
Internal LDO regulator bypassed (usable only when the VBAT
supply voltage is between 3.0 V and 3.6 V)
Open
Internal LDO regulator operational
SUSPEND
SPEED
VIF
J5
VBAT
J6
J8
Short
OE_TP_INT
J4
J7
Function
ADR
VBAT, VIF
VTRM, VBAT
1. See Figure 4.
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1.4
STOTG04 demonstration board hardware
Connector assignments
Table 2.
Demonstration board connectors(1)
Connector
Descriptions
CON1
Power supply pins (P7-P14): VBAT, VIF, and GND
CON2
USB Mini-AB connector for USB/USB OTG devices
CON3
Header connector for the USB OTG controller via the serial interface engine (SIE)
signals (see Section 1.4.1)
CON4
DSUB-9 connector for the PC serial port used to control the transceiver through the I2C
bus
1. See Figure 4.
1.4.1
CON3 pin
The USB OTG controller accesses the USBOTG04’s SIE through the CON3 connector and
controls the following signals (see Table 3):
●
DAT_VP
●
SE0_VM
●
RCV
●
OE_TP_INT
●
I2C bus, and
●
other main signals used by most types of OTG controllers.
Warning:
Table 3.
The Q1 and Q3 transistor bases MUST be connected to GND
BEFORE the demonstration board is connected to the USB OTG
controller. The Q1 and Q3 bases are connected to the R1 and R3
resistors (see Appendix A: STOTG04 demonstration board
schematics).
CON3 pin assignments
Pin No.
Description
Pin no.
Description
1
GND
8
SPEED
2
Not connected
9
VM
3
SCL (I2C clock signal)
10
OE_TP_INT
4
SDA (I2C data signal)
11
RVC
5
INT
12
VP
6
RESET
13
DAT_VP
7
SUSPEND
14
SE0_VM
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USB OTG demonstration software
1.5
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Reset switch (SW1)
The Reset switch (see Figure 3 and Figure 4) can be used to manually reset the STOTG04
hardware. The reset pulse can also be generated by the USB OTG controller via the CON3
RESET pin (see Table 3).
2
USB OTG demonstration software
The "USB OTG Demo" software controls the STOTG04 full-speed transceiver. The
application requires a PC with at least one serial port, and any Windows® operating system.
Note:
This software has been tested on Windows XP.
The software configures and monitors the STOTG04’s internal registers. It sends and
receives I2C signals with RS-232C voltage levels via the serial port. The RS-232C PC signal
levels are converted to the proper I2C signal levels by the demonstration board’s level shifter
(see Chapter 1).
2.1
Launching the software
The USB OTG demonstration program does not require any installation.
2.2
1.
Copy the "demo.exe" file to a destination folder or C:\temp directory
2.
Double-click on the "demo.exe" file to launch the PC-to-demonstration board interface
window
3.
Use the RS-232C cable to connect the board to the PC (or confirm this connection if it
is already set-up)
4.
Select the correct PC serial port in the interface window (for example COM1, COM2,
COM3 or COM4)
5.
Select the STOTG04 address in the interface window (for example 2Ch or 2Dh). The
default address is "2Dh", which is equivalent to open jumper J6
(see Section 1.3: Jumper assignments)
6.
Select the correct device version (STOTG04E or STOTG04ES)
7.
Connect the correct supply voltage to the demonstration board.
PC-to-demonstration board communication
Communication is controlled by two programming buttons (see Figure 5, bottom-right):
●
Read all
●
Write all.
These buttons enable READs or WRITEs to all of the STOTG04 registers, otherwise the
program cannot communicate with the STOTG04.
Note:
For correct use of the application and to prevent any anomalous behavior, it is important to
understand the STOTG04 registers as well as the READ/WRITE sequence of the USB OTG
demonstration program when multiple registers are changing at the same time.
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2.3
USB OTG demonstration software
STOTG04 registers
The STOTG04 has four types of registers (see Figure 5).
●
Control registers
●
Interrupt registers (source, latch, and falling/rising edges)
●
Information registers (vendor ID and product ID)
●
STOTG04 device address (2Ch or 2Dh) registers.
Having a general knowledge of the registers may prevent certain anomalies. For example, if
the J1 jumper is shorted and the "TRANSP_EN" bit has been set by mistake, the STOTG04
stops I2C communication with the board because it is now in "Transparent I2C" mode. The
communication can be reinstated by opening J1. Knowing the READ and WRITE sequence
is important for using the interrupt registers, especially when multiple registers are changing
at the same time. In these cases, the interrupt’s "falling edge" and "rising edge" registers
have the highest priority. For example, to monitor the VBUS_VLD interrupt (this is usually
done when the charge pump is switched ON):
1.
set the VBUS_VLD bit in the "rising edge" register and the VBUS_DRV bit in "Control
Register2"
2.
Click on the "Write All" button
The register WRITE order (priority) is:
–
"Write [Rising Edge (VBUS_VLD)]" THEN
–
"Write [Control Register 2 (VBUS_DRV)]".
The user should always monitor the "Status" field to see if READ or WRITE operations are
successful.
Note that the TRANSP_EN bit in the control register 1 and the 2V7_EN bit in the control
register 3 are enabled only when the STOTG04E device version is selected. The "VendorID"
and "ProductID" registers are read-only and provide the STOTG04’s identity.
Note:
See the STOTG04 USB OTG full-speed transceiver datasheet for details.
Figure 5.
USB OTG demonstration user interface registers
Interrupt source,
latch, and falling/rising
edges
Control
STOTG04
information (read-only)
Note:
STOTG04
device version
STOTG04
device address
Serial port
address field Control buttons
These are STOTG04 register settings after the first "Read All" instruction.
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scl
int/
suspend
VM
RCV
DAT_VP
DB9
R10
10k
VBAT
P4
CON1
1
1
6
2
7
3
8
4
9
5
2
4
6
8
10
12
14
100nF
P6
CON1
1
P5
15
12
9
14
7
1
GND
R1OUT
R2OUT
T1OUT
T2OUT
CON1
USB OTG Controller
1
3
5
7
9
11
13
CON3
VIF
U1
ST3232
V+
V-
C2+
C2-
C1+
C1-
R1IN
R2IN
T1IN
T2IN
C13
1
C12
100nF
2
6
4
5
1
3
13
8
11
10
VBAT
CON1
P2
100nF
100nF
C11
100nF
C10
C9
J2
JUMPER
R12
10k
DTR
RTS
DSR
16
VCC
CON1
1
P1
J1
JUMPER
R11
47k
CON1
1
P3
J3
JUMPER
R13
10k
sda
reset/
speed
oe_tp_int/
VP
SE0_VM
47k
R3
R5
470
VBAT
Q2
2STR1215
47k
R1
J6
JUMPER
adr
R14
10k
Q3
2STR1215
R6
470
VIF
47k
R2
Q1
2STR1215
R4
470
VIF
2
CON4
2
1
2
1
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2
1
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1
scl
VIF
sda
2
JUMPER
J4
CON1
1
P9
CON1
1
P8
1
1
1
adr
oe_tp_int/
SE0_VM
DAT_VP
VM
VP
RCV
reset/
int/
speed
suspend
2
17
9
13
14
10
11
12
4
5
6
8
1
2
3
24
SW1
RESET
JUMPER
J7
sda
C8
100nF scl
VIF-U2
C7
1µF
R9
10k
VIF
P10
CON1
1
VBAT
1
2 1
2
1
1
P14
CON1
STOTG04E
GND
OE_TP_INT/
SE0_VM
DAT_VP
VM
VP
RCV
RESET/
INT/
SPEED
SUSPEND
CGND
VTRM
ID
DD+
VBUS
CAP2
CAP1
VBAT
CON1
1
P13
CON1
1
P12
23
7
18
15 D16 D+
19
22
21
20
R8
R7
22
22
C1
220nF
VBUS
DM
DP
ID
1
VTRM
C3
100nF
1
ID
DM
DP
VBAT-U2
1
J5
1
2
3
4
5
C2
1µF
C5
100nF
VBUS
1
VBUS
DD+
ID
GND
C6
4.7µF
C4
JUMPER
4.7µF
2
P15
P16
P17
P18
CON1 CON1 CON1 CON1
1
P11
CON1
ADR
SDA
SCL
VIF
U2
reset/
VIF
6
7
S0
S1
S2
S3
8
9
J
J
VBAT
CO
USB
Figure 6.
2
Appendix A
1
P7
CON1
STOTG04 demonstration board schematics
UM0212
STOTG04 demonstration board schematics
STOTG04 demonstration board schematics
UM0212
STOTG04 demonstration board bill of materials
Appendix B
Table 4.
STOTG04 demonstration board bill of
materials
STOTG04 bill of materials
Part type
Qty
Designator
Footprint
ST3232
1
U1
SO-16
STOTG04
1
U2
QFN-24
100 nF ±10%
8
C3, C5, C8, C9, C10, C11, C12, C13
0805
1 µF ±10%/16 V/X7R (high cap ceramic)
2
C2, C7
0805
220 nF ±10%/25 V/X7R
1
C1
0805
4,7 µF ±10%/6.3 V/X5R (high cap ceramic)
2
C4, C6
0805
47 kΩ ±5%
4
R1, R2, R3, R11
0805
470 Ω ±5%
3
R4, R5, R6
0805
22 Ω ±5%
2
R7, R8
0805
10 kΩ ±5%
5
R9, R10, R12, R13, R14
0805
Jumper
6
J1, J2, J3, J6, J7, J8
Thru-hole
Header 1
18
P1-P18
Thru-hole
Header 7x2
1
CON3
Thru-hole
DSUB-9 (male)
1
CON4
Thru-hole
Switch
1
SW1
Thru-hole
MINI USB-AB receptacle
1
CON2
USB mini A-B
2STR1215
3
Q1, Q2, Q3
SOT-23
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Revision history
UM0212
Revision history
Table 5.
Document revision history
Date
Revision
Changes
22-Jun-2006
1
Initial release
19-Nov-2008
2
Modified: Figure 5
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UM0212
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