Texas Instruments TPS2149 User manual

  
  
     
September 2001 Mixed Signal Products
User’s Guide
SLVU050

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-VLDOandDualSwitchdatasheet,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 TPS2149 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5–1 TPS2149 Silk Screen 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5–2 Schematic 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

viii

1-1
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.
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 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 in DOS mode. Additionally, one or
more USB devices are needed to plug into the downstream ports of the USB
keyboard/hubEVMtoexercisethehubports.AstandardUSBcableisneeded
to connect the USB keyboard/hub EVM to a downstream 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
The USB keyboard/hub EVM is 4-inches L ×3.5-inches W and features the
TPS2149madeby TexasInstruments.TheTPS2149is apowermanagement
devicethatintegratesanLDOandtwopowerswitchesintoonesmallpackage.
Jumpers (0-Ωresistors) and jumper blocks provided on the EVM are installed
with the factory settings. The settings are described in Table 3–2. Review all
setting changes prior to powering the EVM. Improper settings could result in
damageto some of the EVMcomponents.Thefactorysettings 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 will allow the EVM to
functionasatwoportkeyboardhub.Usersareresponsiblefordevelopingtheir
own application firmware for the target hardware device.
The EVM also 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. The USB specifications require 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 can be used to implement the keyboard function.
Jumpers, test points, and LEDs have been added for testing, troubleshooting
and debugging purposes. Most of the test points are located near the
TPS2149. There are also 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.
Chapter 2

2-2

3-1
EVM Operation
EVM Operation
Operation of the USB keyboard/hub EVM is summarized in paragraphs 3.1
through 3.6.
Topic Page
3.1 TPS2149 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

TPS2149 Setup
3-2
3.1 TPS2149 Setup
The USB keyboard/hub EVM is designed to allow evaluation of the TPS2149
device. Test points and 0-Ωresistors 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 user’s guide. For a complete
descriptionoftheTPS2149device,consulttheTPS2149datasheet(literature
number SLVS401).
3.2 Interfaces and USB Ports
The EVM uses a standard Type-B connector for the upstream port and two
singleTypeAconnectorsfor the downstreamports.Powertothedownstream
ports is provided throught 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 Section 3.4).
3.3 Power Supplies
TheUSBkeyboard/hubEVMrequiresnoexternalpower supply for operation.
The EVM receives power via the USB cable. The TPS2149 low-dropout
regulator is used to generate the required 3.3-V supply from the USB 5-V
supply. The powerindicatorLED(D1)willturnon wheneverpowerisavailable
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).
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,
consult the layout in Section 5.
Table 3–2.Jumpers and Test Points
Jumpers Description
J1 Installed: connects P3.1 to D7
J2 Installed: connects P3.0 to D6
R30 thru R35 0-ΩresistorsusedtoconfiguretheTUSB2136.Forproperoperationwiththefirmwareand
EVM, R30, R31, and R33 are installed at the factory.
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 will
automatically read the EEPROM at power up via the I2C bus. A header must
be added to the application firmware before loading into the EEPROM. This
header format is specified in the bootcode document provided with the
TUSB2136. The header may be generated automatically with the I2C header
generation utility software also provided with the TUSB2136.
Forconvenience, the EEPROMhasbeeninstalled on asocket.Ifdesired, the
socket may be removed and the EEPROM can be soldered directly onto the
board. Using J3 and J4, the firmware installed at the factory will support a
QWERTY keyboard with the matrix shown in Table 3–3.
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

3-4

4-1
Bill of Materials
Bill of Materials
Table 4–1.EVM Bill of Materials
Item Qty Ref. Des. Footprint MFR Part Number Description
1 1 U1 PKG_8P_DGK8 TI TPS2149 3.3-V LDO and dual switch
2 1 U2 PKG_5P_SOT23 TI TPS77018DBVR LDO 1.8 V output
3 1 U4 TUSB2136PM TI TUSB2136PM IC, 2 PORT USB HUB with
FUN CONTR, 64 pin
4 4 FB1, FB2,
FB3, FB4 1812 Mouser 623-2743019447 Ferrite bead
5 10 C3, C5,
C11–C14,
C17–C20 C0805 KEMET C0805C104K5RAC7800 Capacitor, ceramic, 0.1-µF,
50 V, X7R, 10%
6 1 C6 C0805 Murata GRM40X7R105K16PT Capacitor, ceramic, 1.0-µF,
16 V, 20%
7 4 C7–C10 C0605 Murate GRM39C0G220J050AD Capacitor, ceramic, 22-pF,
50 V, 5%
8 2 C1, C2 C0605 Murata GRM39C0G330J050AD Capacitor, ceramic,
33 pF, 16 V, 20%
9 2 C15, C16 7343D NEMCO LSR100/16DK125 Capacitor, tantalum,
100 µF, 16 V, 20%
10 1 C4 CAP_TANTALUM_B Sprague 293D475X0010B2T Capacitor, tantalum,
4.7 µF, 10 V, 20%
11 2J6, J7 CONN_USB_A Digi-Key AU-Y1005 Connector, USB down-
stream (Type A)
12 1 J5 CONN_USB_B Digi-Key AU-Y1007 Connector, USB
upstream (Type B)
13 1 X1 CRYSTAL_016695 Crytek 16695 Crystal, 12 MHz, 20 pF, ±50
PPM at 25°C
14 6 D2–D7 D-LTST-C170FKT Liteon LTST-C170FKT Diode, LED, green, 2.1 V,
14.2-mcd, 20 Ma, 0805
15 1 D1 D-LTST-C170UKT Liteon LTST-C170UKT Diode, LED, red, 2.1 V,
14.2-mcd, 20 Ma, 0805
16 2 J1, J2 HEADER_1X2 Digi-Key S1012-36-ND Header, 2 pin, 100 mil spac-
ing, 36-pin strip
17 2 J3, J4 HEADER_2X7 Samtec SSW-107-02-T-D-RA Header, 2x7 RT ANG. pin,
100 mil
18 4 R9, R12–R14 R0805 Std Std Resistor, chip, 15 kΩ,
1/10 W, 5%
Chapter 4

4-2
Table 4–1. EVM Bill of Materials (Continued)
Item Qty Ref. Des. Footprint MFR Part Number Description
19 10 R29–R38 R0805 Std Std Resistor, chip, 0 Ω, 1/10 W,
5%
20 2 R15, R17 R0805 Std Std Resistor, chip, 1 kΩ,
1/10 W, 5%
21 2 R16, R25 R0805 Std Std Resistor, chip, 1.5 kΩ,
1/10 W, 5%
22 1 R24 R0805 Std Std Resistor, chip, 10 Ω,
1/10 W, 5%
23 2 R20, R21 R0805 Std Std Resistor, chip, 20 kΩ,
1/10 W, 5%
24 6 R10, R11,
R18, R19,
R22, R26 R0805 Std Std Resistor, chip, 30 Ω,
1/10 W, 5%
25 2 R27, R28 R0805 Std Std Resistor, chip, 30.1 kΩ,
1/10 W, 5%
26 1 R23 R0805 Std Std Resistor, chip, 200 kΩ,
1/10 W, 5%
27 8 R1–R8 R0805 Std Std Resistor, chip, 511 Ω,
1/10 W, 5%
28 1 XU1 8 DIP Digi-Key 24LC64P IC serial EEPROM 8K x 8
2.5 V
29 1 XU1 8 pin socket Digi-Key 110-99-308-41-001 IC socket 8 pin MS Tin/
Tin.300
30 1 S1 NC Digi-Key P80075-ND Switch, 1P1T, 20 mA, 15 V
31 18 TP7–TP13,
TP15–25 TP_RED_1MM Farnell 240-345 Test pint, red, 1 mm
32 1 TP14 TP_BLACK_1MM Farnell 240-333 Test pint, black, 1 mm
33 1 Q1 SOT-23 On Semi TR-MMBT3906LT1 Bipolar, PNP, 40 V, 350 mA,
zz W

5-1
EVM Layout
EVM Layout
Figure 5–1.TPS2149 Silk Screen
Chapter 5

5-2
Figure 5–2.Schematic
1 2 3 4 5 6 7 8 9
10
11
12 13 14 15 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
64 63 62 61 60 59 58 47 56 55 54 53 52 51 50 49
SUSP TEST1 TEST0 RST SCL SDA VCC S3 S2 DP1 DGND GND OVCR1 PWR01 PWR02 OCYR2
DP2
PUR
DP0
DM0
GND
SELF/BUS
P2.0
P2.1
GND
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
P1.0
P1.1
P0.5 P0.4 P0.3 P0.2 P0.1 P0.0
GND
P1.7 P1.6
VCC
VREN
VDDOUT
P1.5 P1.4 P1.3 P1.2
DM2
VCC
X1
X2
GND
P3.0/S0
P3.1/S1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
P0.7
P0.6
R16 1.5 KΩ
1.8 V DVCC_33
DGND
DVCC_33
J3 J4
1 2 3 4 5 6 7 8 9
10
11
12 13 14
1 2 3 4 5 6 7 8 9
10
11
12 13 14
DM1
R22
30
R25
1.5 KΩ
R26
30 Ω
Case
Case
Case
Case
R38
0Ω
Power
V–
DP
DM
V+
DGND
J5
4
3
2
1
SUSP
R20 20 kΩ
R21 20 kΩ
33 SUSP
R24
10 Ω
S1
1 A 2 A
3 B 4 B
DGND
R35 0 Ω
R34 0 Ω
R33 0 Ω
R32 0 Ω
R31 0 Ω
R30 0 Ω
DGND
P3.0
P3.1
S2
S3
33 SUSP
R27
30.1 kΩ
R23 200 kΩ
DVCC_33
DGND
C11
R17 1 kΩ R15 1 kΩ
DVCC_33
S2
S3
DVCC_33
DGND
GND
8 7 6 5
DGND
33 SUSP
EN1 8
7 6 5
GND GND GND GND
1 2 3 4
DGND EEPROM
V+
DM
DP
V–
+
C16
J7
1
2
3
4
FB3
DGND
C10
R14
R19
C9
R13
R18
FB4
22 pF
15 kΩ
30 Ω
22 pF
15 kΩ
30 Ω
Case
Case
V–
DP
DM
V+
+
C15
J6
4
3
2
1
FB2
C8
R11
C7 22 pF
15 kΩ
22 pF R12
15 kΩ
30 Ω
R10 30 Ω
R9
DGND
FB1
XU1
1 2 3 4OUT2
LDO_OUT
VIN
OUT1
EN2
OC
GND DGND
R36 0Ω
R29 0Ω
R37 0Ω
100µF
C5
0.1 µF
C3 Power
DGND
2
GND
3
GND
4 5
NC
DVCC_33
U1
U2
C6
C4
4.7 µF
1.8 V
+DGND
1.8 V
LDO
X1
12 MHz OSC
C1 C2
33 pF 33 pF
DGND DVCC_33
DGND
P3.0
P3.1
R8 511 Ω R6 511 Ω R5 511 Ω
R4 511 Ω
D2 D3 D4 D5 D6 D7
R3 511 ΩJ1
P3.1
1 2
R7 511 ΩJ2
P3.0
1 2
R2 511 Ω R1 511 ΩD1 SUSP
33 SUSP DVCC_33
Q1
C12 0.1 µF C13 C14 C17 C18 C19 C20 DVCC_33DGND
U4
TUSB2136PM
1
0.1 µF 0.1 µF 0.1 µF 0.1 µF
0.1 µF
0.1 µF0.1 µF
0.1 µF
0.1 µF
0.1 µF
100µF100µF