Texas Instruments Switch TUSB2136 User Manual

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User’s Guide  
December 2001  
Mixed Signal Products  
SCAU003  
 
EVM IMPORTANT NOTICE  
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:  
This evaluation kit being sold by TI is intended for use for ENGINEERING  
DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to  
befitforcommercialuse. Assuch, thegoodsbeingprovidedmaynotbecompleteinterms  
of required design-, marketing-, and/or manufacturing-related protective considerations,  
including product safety measures typically found in the end product incorporating the  
goods. As a prototype, this product does not fall within the scope of the European Union  
directive on electromagnetic compatibility and therefore may not meet the technical  
requirements of the directive.  
Should this evaluation kit not meet the specifications indicated in the EVM Users Guide,  
the kit may be returned within 30 days from the date of delivery for a full refund. THE  
FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO  
BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR  
STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS  
FOR ANY PARTICULAR PURPOSE.  
The user assumes all responsibility and liability for proper and safe handling of the goods.  
Further, the user indemnifies TI from all claims arising from the handling or use of the  
goods. Please be aware that the products received may not be regulatory compliant or  
agency certified (FCC, UL, CE, etc.). Due to the open construction of the product, it is  
the users responsibility to take any and all appropriate precautions with regard to  
electrostatic discharge.  
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER  
PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL,  
INCIDENTAL, OR CONSEQUENTIAL DAMAGES.  
TI currently deals with a variety of customers for products, and therefore our arrangement  
with the user is not exclusive.  
TI assumes no liability for applications assistance, customer product design,  
software performance, or infringement of patents or services described herein.  
Please read the EVM Users Guide and, specifically, the EVM Warnings and Restrictions  
notice in the EVM Users Guide prior to handling the product. This notice contains  
important safety information about temperatures and voltages. For further safety  
concerns, please contact the TI application engineer.  
Personshandlingtheproductmusthaveelectronicstrainingandobservegoodlaboratory  
practice standards.  
No license is granted under any patent right or other intellectual property right of TI  
covering or relating to any machine, process, or combination in which such TI products  
or services might be or are used.  
Mailing Address:  
Texas Instruments  
Post Office Box 655303  
Dallas, Texas 75265  
Copyright 2001, Texas Instruments Incorporated  
 
EVM WARNINGS AND RESTRICTIONS  
It is important to operate this EVM within the specified input and output ranges described in  
the EVM Users Guide.  
Exceeding the specified input range may cause unexpected operation and/or irreversible  
damage to the EVM. If there are questions concerning the input range, please contact a TI  
field representative prior to connecting the input power.  
Applyingloadsoutsideofthespecifiedoutputrangemayresultinunintendedoperationand/or  
possible permanent damage to the EVM. Please consult the EVM Users Guide prior to  
connecting any load to the EVM output. If there is uncertainty as to the load specification,  
please contact a TI field representative.  
During normal operation, some circuit components may have case temperatures greater than  
60°C. The EVM is designed to operate properly with certain components above 60°C as long  
as the input and output ranges are maintained. These components include but are not limited  
tolinearregulators, switchingtransistors, passtransistors, andcurrentsenseresistors. These  
types of devices can be identified using the EVM schematic located in the EVM Users Guide.  
When placing measurement probes near these devices during operation, please be aware  
that these devices may be very warm to the touch.  
Mailing Address:  
Texas Instruments  
Post Office Box 655303  
Dallas, Texas 75265  
Copyright 2001, Texas Instruments Incorporated  
 
Preface  
Read This First  
How to Use This Manual  
This document contains the following chapters:  
- Chapter 1 Introduction  
- Chapter 2 Hardware Overview  
- Chapter 3 EVM Operation  
- Chapter 4 Bill of Materials  
- Chapter 5 EVM Layout  
Related Documentation From Texas Instruments  
TPS2149 3.3-V LDO and Dual Switch data sheet, literature number SLVS401  
TUSB2136 USB Keyboard Hub Controller data sheet, literature number  
SLLS442  
FCC Warning  
Thisequipmentisintendedforuseinalaboratorytestenvironmentonly. Itgen-  
erates, uses, and can radiate radio frequency energy and has not been tested  
for compliance with the limits of computing devices pursuant to subpart J of  
part 15 of FCC rules, which are designed to provide reasonable protection  
against radio frequency interference. Operation of this equipment in other en-  
vironments may cause interference with radio communications, in which case  
the user at his own expense will be required to take whatever measures may  
be required to correct this interference.  
v
 
vi  
 
Contents  
1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1  
1.1  
Required Hardware and Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2  
2
3
Hardware Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1  
EVM Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1  
3.1  
3.2  
3.3  
3.4  
3.5  
3.6  
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
Interfaces and USB Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
Light Emitting Diodes (LEDs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
Jumpers and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
4
5
Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1  
EVM Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1  
Figures  
11  
USB Keyboard/Hub EVM Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2  
Tables  
31  
32  
33  
41  
42  
LED Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
Jumpers and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
QWERTY Keyboard Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
EVM Bill of Materials for Edge Number 6436539 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1  
EVM Bill of Materials for Edge Number 6436540 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2  
vii  
 
viii  
 
Chapter 1  
Introduction  
This users guide describes the setup and operation of the USB keyboard/hub  
evaluation module (EVM). Information and instruction presented throughout  
this document assumes user familiarity with universal serial bus (USB)  
protocol and the use of common lab testing equipment.  
Additional information about this EVM can be found at:  
Topic  
Page  
1.1 Required Hardware and Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2  
1-1  
 
Required Hardware and Software  
1.1 Required Hardware and Software  
The USB keyboard/hub EVM is designed for use with a personal computer  
running a USB-enabled operating system. The PC, with BIOS, chipsets, and  
operating system, should be USB 1.1 or 2.0 specification-compliant. If the  
BIOS is not compliant, the system may not boot when USB devices are  
connected at power up, and the EVM may not function. Additionally, one or  
more low- or full-speed USB devices are needed to plug into the downstream  
portsoftheUSBkeyboard/hubEVMtoexercisethehubports. AstandardUSB  
cable is needed to connect the USB keyboard/hub EVM to a downstream port  
of the PC or a USB hub tier.  
Figure 11. USB Keyboard/Hub EVM Hardware  
USB EVM  
1-2  
 
Chapter 2  
Hardware Overview  
The USB keyboard/hub EVM features the TUSB2136 and the TPS2149 made  
by Texas Instruments. The EVM is a two-board set made up of a stand alone  
two-port hub (edge #6436539) and a miniature QWERTY keyboard (edge  
#6436540). Jumpers (0-resistors) and jumper blocks provided on the EVM  
areinstalledwiththefactorysettings. ThesettingsaredescribedinTable 32.  
Review all setting changes prior to powering the EVM. Improper settings could  
result in damage to some of the EVM components. The factory settings allow  
2
the EVM to operate using a 12-MHz crystal along with an I C EEPROM. The  
EVM has also been configured to work only in bus-powered mode. The  
firmware installed at the factory and stored in the EEPROM allows the EVM  
to function as a two port keyboard hub. Users are responsible for developing  
their own application firmware for the target hardware device.  
The EVM uses a TUSB2136, USB keyboard/hub controller, made by Texas  
Instruments, to communicate with the host and the downstream devices. A  
USB cable is needed to connect the root hub of the PC to the EVM type B  
connector (J5). The downstream devices connect to the EVM via the J6 and  
J7 connectors. These downstream devices are powered through the  
TPS2149, a power management device that integrates an LDO and two power  
switches into one small package. The LDO is used to provide power to the  
TUSB2136. The USB specification requires that downstream ports remain off  
until enumeration is complete. Together, the TUSB2136 and the TPS2149  
ensure the hub meets this requirement. Two other connectors, J3 and J4,  
allow easy connection to the TUSB2136 general-purpose I/O lines. These  
lines are used to implement the keyboard function. The miniature QWERTY  
keyboardplugsdirectlyintoJ3andJ4toimplementafullyfunctionalkeyboard.  
Jumpers, test points, and LEDs have been added for testing, troubleshooting  
and debugging purposes. There are test points on the differential pair lines of  
the upstream B-type connector and the two downstream A-type connectors.  
2
The I C port can be probed directly on the EEPROM. Six LEDs are provided  
for quick feedback during firmware debugging or as status information. One  
LED (D1) is fixed to provide power and suspend status of the TUSB2136  
device. An RS232 port is available for monitoring 8052 MCU activity. The port  
uses a one-to-one cable and not a null-modem cable.  
2-1  
 
2-2  
 
Chapter 3  
EVM Operation  
Operation of the USB keyboard/hub EVM is summarized in this chapter.  
Topic  
Page  
3.1 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
3.2 Interfaces and USB Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
3.3 Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
3.4 Light-Emitting Diodes (LEDs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
3.5 Jumpers and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
3.6 EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
3-1  
 
Setup  
3.1 Setup  
The USB keyboard/hub EVM is designed to allow evaluation of the TUSB2136  
and the TPS2149 device. Test points and 0-resistors are provided to simplify  
the evaluation process (see section 3.5). The EVM comes in a default  
configuration that requires no additional components, other than the required  
hardware and software identified in Section 1.1 of this users guide. For a  
complete description of the TUSB2136 and the TPS2149 devices, consult the  
TUSB2136 and the TPS2149 data sheets (literature numbers SLLS442 and  
SLVS401, respectively).  
3.2 Interfaces and USB Ports  
The EVM uses a standard Type-B connector for the upstream port and two  
single Type-A connectors for the downstream ports. Power to the downstream  
ports is provided from the upstream USB 5-V source through the TPS2149.  
Two edge connectors, J3 and J4, connect to the TUSB2136 general-purpose  
I/O lines. Out of 32 general-purpose I/O lines, 26 are brought out to the J3 and  
J4 connectors. The remaining 6 I/O lines are used onboard to control theLEDs  
(see Light Emitting Diodes (LEDs) in this chapter).  
3.3 Power Supplies  
The USB keyboard/hub EVM requires no external power supply for operation.  
The EVM receives power via the upstream USB cable. The USB 5-V source  
is limited by the USB specification to 500 mA max. The TPS2149 low-dropout  
regulator is used to generate the required 3.3-V supply from the USB 5-V  
supply. The power indicator LED (D1) turns on whenever power is available  
to the EVM (see Table 31).  
3.4 Light Emitting Diodes (LEDs)  
SeveralonboardLEDsareprovidedontheEVMforquickandeasyevaluation.  
A set of six green LEDs (D2 D7), connected to P3.0 through P3.5 of the  
TUSB2136, may be used for general purposes in any code that is written for  
the TUSB2136 (see Table 31). By default, the factory code provides the EVM  
with the use of only three of the LEDs as keyboard status indicators for Scroll  
Lock (D2), Caps Lock (D3), and Num Lock (D4). The other three are not used.  
Table 31.LED Description  
LED  
Description  
D2D7  
Green LED ON indicates corresponding GPIO pin is low (when D1 is ON).  
Green LED OFF indicates corresponding GPIO pin is high (when D1 is ON).  
D1  
Red LED ON indicates that the EVM is powered on and not suspended.  
Red LED OFF indicates that the EVM is powered off or suspended.  
3-2  
 
Jumpers and Test Points  
3.5 Jumpers and Test Points  
Table 32 describes the jumpers J1 and J2, used to connect P3.0 and P3.1  
to D6 and D7 respectively, which should only be done when P3.0/S0 and  
P3.1/S1 are not set to GND for VID/PID selection (see the TUSB2136  
keyboard hub controller data sheet, literature number SLLS442) via SW13  
and SW14.  
Table 32 also describes the various 0-resistors used as jumpers. Test  
points are located throughout the EVM. For location of these test points, see  
the EVM Layout section of this users guide.  
Table 32.Jumpers and Test Points  
Jumpers  
J1  
Description  
Connects P3.1 to D7  
J2  
Connects P3.0 to D6  
J9  
Connects the serial data line of the EEPROM to the TUSB2136. Installed at factory.  
Connects power to the RS232 interface chip  
J10  
J11, J12  
Connects the transmit and receive lines on the RS232 interface chip to the TUSB2136  
A set of six switches used to configure the TUSB2136. For proper operation with the  
firmware and EVM, SW13, SW15, and SW16 should be set to on.  
SW1  
R29, R36, R37, R38 0-resistors on power lines which may be removed to insert a current meter  
3.6 EEPROM  
The EEPROM is used for application-specific firmware. The TUSB2136  
2
automatically reads the EEPROM at power up via the I C bus. A header must  
be added to the application firmware before loading into the EEPROM. This  
header format is specified in the bootcode document (literature number  
SLLU025), which can be found on the EVM web page at  
www.ti.com/sc/usbkbdkit. The header may be generated automatically with  
2
the I C header generation utility software also found on the EVM website  
For convenience, the EEPROM has been installed on a socket. If desired, the  
socket may be removed and the EEPROM can be soldered directly onto the  
board. The firmware installed at the factory supports the miniature QWERTY  
keyboard with the matrix shown in Table 33. The miniature QWERTY  
keyboard connects to J3 and J4.  
EVM Operation  
3-3  
 
EEPROM  
Table 33.QWERTY Keyboard Matrix  
Port  
No.  
P3.6  
P0.6  
P0.7  
P0.4  
P0.5  
P0.2  
COL 6  
P0.3  
COL 7  
P0.0  
P0.1  
P1.6  
Matrix  
COL 1 COL 2 COL 3 COL 4 COL 5  
COL 8 COL 9 COL 10  
P2.7 ROW 1  
P2.6 ROW 2  
P2.5 ROW 3  
P2.4 ROW 4  
P2.3 ROW 5  
P2.2 ROW 6  
P2.1 ROW 7  
P2.0 ROW 8  
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END  
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3-4  
 
EVM Operation  
3-5  
 
Chapter 4  
Bill of Materials  
This chapter contains the EVM bill of materials for edge number 6436539 and  
edge number 6436540.  
Table 41.EVM Bill of Materials for Edge Number 6436539  
RefDes  
Description  
Size  
MFR  
Part Number  
QTY  
2
C1, C2  
Capacitor, ceramic, 33 pF, 16 V,  
[temp], 5%  
805  
MuRata  
GRM39C0G330J100V  
3
9
C3, C4, C25  
Capacitor, tantalum, 4.7 µF, 10 V,  
zz m, 20%  
3528  
805  
Panasonic  
Kemet  
293D475X0010B2T  
C5, C11 C14,  
Capacitor, ceramic, 0.1 µF, 50 V,  
C0805C104K5RAC7800  
C17 C20  
X7R,10%  
4
2
4
C7 C10  
C15, C16  
C21 C24  
Capacitor, ceramic, 22 pF, 50 V, 5%  
805  
Murata  
NEMCO  
Murata  
GRM39C0G220J50V  
LSR10016DK125  
Capacitor, POSCAP, 100 µF, 16 V  
7343 (D)  
805  
Capacitor, ceramic, 1 µF, 50 V, X7R,  
GRM40X7R105K16PT  
10%  
1
6
4
D1  
Diode, LED, red, 2.1 V, 14.2 mcd,  
20 mA  
805  
805  
Liteon  
Liteon  
LTSTC170UKT  
LTSTC170FKT  
SMB20  
D2 D7  
FB1 FB4  
Diode, LED, green, 2.1 V, 14.2 mcd,  
20 mA  
SMB20 surface ferrite mount bead  
Allied Com-  
ponents  
6
2
1
2
J1, J2, J9 J12  
Header, 2-pin, 100mil spacing  
PTC36SAAN  
J3, J4  
J5  
Header, 2 x 7 RT ANG. pin, 100mil  
Connector, USB upstream (Type B)  
Samtec  
Molex  
SSW10702TDRA  
AUY1007  
J6, J7  
Connector, USB downstream (Type  
A)  
AUY1005  
1
1
8
4
J8  
Connector, 9-pin D, right angle, male  
Bipolar, PNP, 40 V, 350 mA, zz W  
Resistor, chip, 510 , 1/10 W, 5%  
Resistor, chip,15 k, 1/10 W, 5%  
AMP  
On Semi  
Std  
7472504  
MMBT3904LT1  
Std  
Q1  
SOT23  
805  
R1 R8  
R9, R12 R14  
805  
Std  
Std  
4-1  
 
Table 41.EVM Bill of Materials for Edge Number 6436539 (Continued)  
QTY  
RefDes  
Description  
Size  
MFR  
Part Number  
6
R10, R11, R18,  
R19, R22, R26  
Resistor, chip, 30 , 1/10 W, 5%  
805  
Std  
Std  
3
R15, R17, R30  
Resistor, chip, 1 k, 1/10 W, 5%  
805  
Std  
Std  
2
2
1
1
2
1
1
4
R20, R21  
R16, R23  
R24  
Resistor, chip, 20 k, 1/10 W,5%  
Resistor, chip, 200 k, 1/10 W, 5%  
Resistor, chip, 10 , 1/10 W, 5%  
Resistor, chip, 1.5 k, 1/10 W, 5%  
Resistor, chip, 30.1 k, 1/10 W,1%  
Resistor, chip, 100 k, 1/10 W, 5%  
Resistor, chip, 90 k, 1/10 W, 5%  
Resistor, chip, 0 , 1/10 W, 5%  
805  
805  
805  
805  
805  
805  
805  
805  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
R25  
R27, R28  
R31  
R32  
R29, R36, R37,  
R38  
1
1
S1  
Switch, 1P1T, 20 mA, 15 V  
Panasonic  
EVQPAD04M  
SW1  
Switch, 6 POS, SPST, low profile,  
SMT, 0.5 inch centers  
CTS Corp. CTS Corp.  
1
TP14  
Test point, black, 1 mm  
Test point, red, 1 mm  
Farnell  
Farnell  
240333  
20  
TP1, TP2, TP7 –  
TP13, TP15 –  
TP25  
240345  
1
1
1
U1  
U3  
U4  
3.3-V LDO and dual switch  
DGN8  
SO16  
TI  
TI  
TI  
TPS2149  
IC, dual EIA232, driver/receiver  
MAX232ID  
TUSB2136PM  
IC, 2 port USB hub w/Funcontr, 64  
pin SPQFPG64 Pkg  
1
1
X1  
Crystal, 12 MHz, 20 pF, ±50 PPM  
@ 25°C  
Crytek  
16695  
XU1  
Socket, 8-pin DIP  
1109930841001  
Table 42.EVM Bill of Materials For fdge Number 6436540  
RefDes  
Description  
Size  
MFR  
Part Number  
QTY  
2
J1, J2  
Header, 2 x 7 RT. ANG. pin 100mil  
Resistor, chip, 511 , 1/10 W 5%  
18  
R39 R45,  
R48, R49,  
R50, R57,  
R58, R61 –  
R66  
R0805  
Std  
Std  
57  
0 56  
Switch, 1P1T, 20 mA, 15 V  
Panasonic  
EVQPAD04M  
4-2  
 
Chapter 5  
EVM Layout  
This chapter contains the EVM layout and schematics for edge number  
6436539 and 6436540.  
5-1  
 

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