Texas Instruments TUSB2136 User manual

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December 2001 Mixed Signal Products
User’s Guide
SCAU003

IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
ordersandshouldverifythatsuchinformationiscurrentandcomplete.AllproductsaresoldsubjecttoTI’sterms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TIdoesnotwarrantorrepresentthatanylicense, eitherexpress orimplied, isgranted underanyTIpatentright,
copyright,maskworkright,orotherTIintellectualpropertyrightrelatingtoanycombination,machine,orprocess
inwhichTIproductsorservicesareused.InformationpublishedbyTIregardingthird–partyproductsorservices
does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.
Use of such information may require a license from a third party under the patents or other intellectual property
of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without
alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction
of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for
such altered documentation.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that
product or service voids all express and any implied warranties for the associated TI product or service and
is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2001, Texas Instruments Incorporated

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 User’s 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.
Theuserassumesallresponsibilityandliabilityforproperandsafehandlingofthegoods.
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 user’s 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.
TIcurrentlydealswithavarietyofcustomersforproducts,andthereforeourarrangement
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.
Pleasereadthe EVMUser’s Guideand,specifically,theEVM WarningsandRestrictions
notice in the EVM User’s 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 User’s 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 User’s 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.
Duringnormaloperation,somecircuitcomponentsmayhavecasetemperaturesgreaterthan
60°C.TheEVM isdesignedto operateproperlywith certaincomponentsabove 60°C aslong
astheinputandoutput rangesare maintained.Thesecomponentsincludebut arenot limited
tolinearregulators,switchingtransistors,passtransistors,andcurrentsenseresistors.These
typesof devicescanbeidentifiedusingtheEVM schematiclocated intheEVMUser’sGuide.
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

Related Documentation From Texas Instruments
v
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-VLDOandDual Switchdatasheet,literaturenumberSLVS401
TUSB2136 USB Keyboard Hub Controller data sheet, literature number
SLLS442
FCC Warning
Thisequipmentisintendedforuseinalaboratorytestenvironmentonly.Itgen-
erates,uses,andcanradiateradiofrequencyenergyandhasnotbeentested
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-
vironmentsmaycauseinterferencewithradiocommunications,inwhichcase
the user at his own expense will be required to take whatever measures may
be required to correct this interference.

vi

Contents
vii
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Required Hardware and Software 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Hardware Overview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 EVM Operation 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Bill of Materials 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 EVM Layout 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figures
1–1 USB Keyboard/Hub EVM Hardware 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
3–1 LED Description 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–2 Jumpers and Test Points 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–3 QWERTY Keyboard Matrix 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–1 EVM Bill of Materials for Edge Number 6436539 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–2 EVM Bill of Materials for Edge Number 6436540 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

viii

1-1
Introduction
Introduction
Thisuser’sguidedescribesthesetupand operation of theUSBkeyboard/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:
www.ti.com/sc/usb–kbdkit
Topic Page
1.1 Required Hardware and Software 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

Required Hardware and Software
1-2
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
cableis needed to connect theUSBkeyboard/hubEVMtoadownstream port
of the PC or a USB hub tier.
Figure 1–1.USB Keyboard/Hub EVM Hardware
USB EVM

2-1
Hardware Overview
Hardware Overview
TheUSBkeyboard/hubEVMfeaturestheTUSB2136andtheTPS2149made
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-Ωresistors) and jumper blocks provided on the EVM
areinstalledwiththefactorysettings.ThesettingsaredescribedinTable 3–2.
ReviewallsettingchangespriortopoweringtheEVM.Impropersettingscould
result in damage to some of the EVM components. The factory settings allow
the EVM to operate using a 12-MHz crystal along with an I2C 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,apowermanagementdevicethatintegratesanLDOandtwopower
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.
The I2C 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.AnRS–232portisavailableformonitoring8052MCUactivity.Theport
uses a one-to-one cable and not a null-modem cable.
Chapter 2

2-2

3-1
EVM Operation
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3

Setup
3-2
3.1 Setup
TheUSBkeyboard/hubEVMisdesignedtoallowevaluationoftheTUSB2136
andtheTPS2149device.Testpointsand0-Ωresistorsareprovidedtosimplify
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 user’s guide. For a
completedescriptionoftheTUSB2136 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
singleType-Aconnectorsforthedownstreamports.Powertothedownstream
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/Olines.Outof32general-purposeI/Olines,26arebroughtoutto the J3 and
J4connectors.Theremaining6I/OlinesareusedonboardtocontroltheLEDs
(see Light Emitting Diodes (LEDs) in this chapter).
3.3 Power Supplies
TheUSBkeyboard/hubEVMrequiresnoexternalpower 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 3–1).
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
theTUSB2136(see Table3–1).Bydefault,thefactorycodeprovidestheEVM
with the use of only three of the LEDs as keyboard status indicators for Scroll
Lock(D2),CapsLock(D3),andNumLock(D4).Theotherthreearenotused.
Table 3–1.LED Description
LED Description
D2–D7 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.

Jumpers and Test Points
3-3
EVM Operation
3.5 Jumpers and Test Points
Table 3–2 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 SW1–3
and SW1–4.
Table 3–2 also describes the various 0-Ωresistors used as jumpers. Test
points are located throughout the EVM. For location of these test points, see
the EVM Layout section of this user’s guide.
Table 3–2.Jumpers and Test Points
Jumpers Description
J1 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.
J10 Connects power to the RS232 interface chip
J11, J12 Connects the transmit and receive lines on the RS232 interface chip to the TUSB2136
SW1 A set of six switches used to configure the TUSB2136. For proper operation with the
firmware and EVM, SW1–3, SW1–5, and SW1–6 should be set to on.
R29, R36, R37, R38 0-Ωresistors 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
automatically reads the EEPROM at power up via the I2Cbus. 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/usb–kbdkit. The header may be generated automatically with
the I2C header generation utility software also found on the EVM website
Forconvenience, the EEPROMhasbeeninstalled on asocket.Ifdesired, 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 3–3. The miniature QWERTY
keyboard connects to J3 and J4.

EEPROM
3-4
Table 3–3.QWERTY Keyboard Matrix
Port
No. Matrix P3.6 COL 1 P0.6 COL 2 P0.7 COL 3 P0.4 COL 4 P0.5 COL 5 P0.2 COL 6 P0.3 COL 7 P0.0 COL 8 P0.1 COL 9 P1.6 COL 10
P2.7 ROW 1 Q 9 A 6 Z 3 DEL
P2.6 ROW 2 W 8 S 5 X 2 0
P2.5 ROW 3 E 7 D 4 C 1 INS
P2.4 ROW 4 R ESC F HOME V END R ARROW
P2.3 ROW 5 T I G K B / SPACE
P2.2 ROW 6 Y P H “NU ARROW D ARROW
P2.1 ROW 7 U O J L M \ L ARROW
P2.0 ROW 8 –, + ENTER . SHIFT ALT CTL

3-5
EVM Operation

4-1
Bill of Materials
Bill of Materials
Thischapter contains theEVMbillof materials foredgenumber6436539 and
edge number 6436540.
Table 4–1.EVM Bill of Materials for Edge Number 6436539
QTY RefDes Description Size MFR Part Number
2C1, C2 Capacitor, ceramic, 33 pF, 16 V,
[temp], 5% 805 MuRata GRM39C0G330J100V
3C3, C4, C25 Capacitor, tantalum, 4.7 µF, 10 V,
zz mΩ, 20% 3528 Panasonic 293D475X0010B2T
9C5, C11 –C14,
C17 –C20 Capacitor, ceramic, 0.1 µF, 50 V, X7R,10% 805 Kemet C0805C104K5RAC7800
4 C7 –C10 Capacitor, ceramic, 22 pF, 50 V, 5% 805 Murata GRM39C0G220J50V
2C15, C16 Capacitor, POSCAP, 100 µF, 16 V 7343 (D) NEMCO LSR10016DK125
4 C21 –C24 Capacitor, ceramic, 1 µF, 50 V, X7R,
10% 805 Murata GRM40X7R105K16PT
1 D1 Diode, LED, red, 2.1 V, 14.2 mcd,
20 mA 805 Liteon LTST–C170UKT
6 D2 –D7 Diode, LED, green, 2.1 V, 14.2 mcd,
20 mA 805 Liteon LTST–C170FKT
4 FB1 –FB4 SMB20 surface ferrite mount bead Allied Com-
ponents SMB20
6J1, J2, J9 –J12 Header, 2-pin, 100mil spacing PTC36SAAN
2J3, J4 Header, 2 x 7 RT ANG. pin, 100mil Samtec SSW–107–02–T–D–RA
1 J5 Connector, USB upstream (Type B) Molex AU–Y1007
2J6, J7 Connector, USB downstream (Type
A) AU–Y–1005
1 J8 Connector, 9-pin D, right angle, male AMP 747250–4
1 Q1 Bipolar, PNP, 40 V, 350 mA, zz W SOT23 On Semi MMBT3904LT1
8 R1 –R8 Resistor, chip, 510 Ω, 1/10 W, 5% 805 Std Std
4R9, R12 –R14 Resistor, chip,15 kΩ, 1/10 W, 5% 805 Std Std
Chapter 4

4-2
Table 4–1.EVM Bill of Materials for Edge Number 6436539 (Continued)
QTY RefDes Description Size MFR Part Number
6R10, R11, R18,
R19, R22, R26 Resistor, chip, 30 Ω, 1/10 W, 5% 805 Std Std
3R15, R17, R30 Resistor, chip, 1 kΩ, 1/10 W, 5% 805 Std Std
2R20, R21 Resistor, chip, 20 kΩ, 1/10 W,5% 805 Std Std
2R16, R23 Resistor, chip, 200 kΩ, 1/10 W, 5% 805 Std Std
1 R24 Resistor, chip, 10 Ω, 1/10 W, 5% 805 Std Std
1 R25 Resistor, chip, 1.5 kΩ, 1/10 W, 5% 805 Std Std
2R27, R28 Resistor, chip, 30.1 kΩ, 1/10 W,1% 805 Std Std
1 R31 Resistor, chip, 100 kΩ, 1/10 W, 5% 805 Std Std
1 R32 Resistor, chip, 90 kΩ, 1/10 W, 5% 805 Std Std
4R29, R36, R37,
R38 Resistor, chip, 0 Ω, 1/10 W, 5% 805 Std Std
1 S1 Switch, 1P1T, 20 mA, 15 V Panasonic EVQ–PAD04M
1 SW1 Switch, 6 POS, SPST, low profile,
SMT, 0.5 inch centers CTS Corp. CTS Corp.
1 TP14 Test point, black, 1 mm Farnell 240–333
20 TP1, TP2, TP7 –
TP13, TP15 –
TP25
Test point, red, 1 mm Farnell 240–345
1 U1 3.3-V LDO and dual switch DGN8 TI TPS2149
1 U3 IC, dual EIA–232, driver/receiver SO16 TI MAX232ID
1 U4 IC, 2 port USB hub w/Funcontr, 64
pin S–PQFP–G64 Pkg TI TUSB2136PM
1 X1 Crystal, 12 MHz, 20 pF, ±50 PPM
@25°CCrytek 16695
1 XU1 Socket, 8-pin DIP 110–99–308–41–001
Table 4–2.EVM Bill of Materials For fdge Number 6436540
QTY RefDes Description Size MFR Part Number
2J1, J2 Header, 2 x 7 RT. ANG. pin 100mil
18 R39 –R45,
R48, R49,
R50, R57,
R58, R61 –
R66
Resistor, chip, 511 Ω, 1/10 W 5% R0805 Std Std
57 0 –56 Switch, 1P1T, 20 mA, 15 V Panasonic EVQ–PAD04M

5-1
EVM Layout
EVM Layout
This chapter contains the EVM layout and schematics for edge number
6436539 and 6436540.
Chapter 5