Page 1
User’s Guide
September 2001 Mixed Signal Products
SLVU050
Page 2
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
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
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. T o minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process
in which TI products or services are used. Information published by TI regarding third–party products or services
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
Page 3
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
be fit for commercial use. As such, the goods being provided may not be complete in terms
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.
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 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.
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 User’s Guide and, specifically, the EVM W arnings and Restrictions
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.
Persons handling the product must have electronics training and observe good laboratory
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
Page 4
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.
Applying loads outside of the specified output range may result in unintended operation and/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.
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
to linear regulators, switching transistors, pass transistors, and current sense resistors. These
types of devices can be identified using the EVM schematic located in the EVM User’s 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
Page 5
How to Use This Manual
This document contains the following chapters:
- Chapter 1 – Introduction
- Chapter 2 – Hardware Overview
Related Documentation From Texas Instruments
Preface
Read This First
- 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 SL VS401.
TUSB2136 USB Keyboard Hub Controller data sheet, literature number
SLLS442.
FCC Warning
This equipment is intended for use in a laboratory test environment only . It generates, 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 environments 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
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vi
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Contents
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
vii
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viii
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Chapter 1
Introduction
This user’s 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.
Topic Page
1.1 Required Hardware and Software 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1
Page 10
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 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/hub EVM to exercise the hub ports. A standard USB cable is needed
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
1-2
Page 11
Chapter 2
Hardware Overview
The USB keyboard/hub EVM is 4-inches L × 3.5-inches W and features the
TPS2149 made by T exas Instruments. The TPS2149 is a power management
device that integrates an LDO and two power switches into one small package.
Jumpers (0-Ω resistors) 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
damage to some of the EVM components. The factory settings allow the EVM
2
to operate using a 12-MHz crystal along with an I
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
function as a two port keyboard hub. Users are responsible for developing their
own application firmware for the target hardware device.
C EEPROM. The EVM has
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
2
C port can be probed directly on the EEPROM. Six LEDs are provided for
I
quick feedback during firmware debugging or as status information. One LED
(D1) is fixed to provide power and suspend status of the TUSB2136 device.
Hardware Overview
2-1
Page 12
2-2
Page 13
Chapter 3
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 T est Points 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6 EEPROM 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVM Operation
3-1
Page 14
TPS2149 Setup
3.1 TPS2149 Setup
The USB keyboard/hub EVM is designed to allow evaluation of the TPS2149
device. Test points and 0-Ω 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 user’s guide. For a complete
description of the TPS2149 device, consult the TPS2149 data sheet (literature
number SLVS401).
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 throught 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 the LEDs
(see Section 3.4).
3.3 Power Supplies
The USB keyboard/hub EVM requires no external power 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 power indicator LED (D1) will turn on whenever power is available
to the EVM (see Table 3–1).
3.4 Light Emitting Diodes (LEDs)
Several onboard LEDs are provided on the EVM for quick and easy evaluation.
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 T able 3–1). 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 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.
3-2
Page 15
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-Ω resistors 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
Jumpers and Test Points
R30 thru R35
R29, R36, R37, R38 0-Ω resistors on power lines which may be removed to insert a current meter.
0-Ω resistors used to configure the TUSB2136. For proper operation with the firmware and
EVM, R30, R31, and R33 are installed at the factory .
3.6 EEPROM
The EEPROM is used for application-specific firmware. The TUSB2136 will
2
automatically read the EEPROM at power up via the I
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 I
generation utility software also provided with the TUSB2136.
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. 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
C bus. A header must
P0.3
COL 7
P0.0
COL 8
2
C header
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 “ N U ARROW D ARROW
P2.1 ROW 7 U O J L M \ L ARROW
P2.0 ROW 8 – , + ENTER . SHIFT ALT CTL
EVM Operation
3-3
Page 16
3-4
Page 17
Chapter 4
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
4 4
5 10
6 1 C6 C0805 Murata GRM40X7R105K16PT
7 4 C7–C10 C0605 Murate GRM39C0G220J050AD
8 2 C1, C2 C0605 Murata GRM39C0G330J050AD
9 2 C15, C16 7343D NEMCO LSR100/16DK125
10 1 C4 CAP_TANTALUM_B Sprague 293D475X0010B2T
11 2 J6, J7 CONN_USB_A Digi-Key AU-Y1005
12 1 J5 CONN_USB_B Digi-Key AU-Y1007
13 1 X1 CRYSTAL_016695 Crytek 16695
14 6 D2–D7 D-LTST-C170FKT Liteon LTST-C170FKT
15 1 D1 D-LTST-C170UKT Liteon LTST-C170UKT
16 2 J1, J2 HEADER_1X2 Digi-Key S1012-36-ND
17 2 J3, J4 HEADER_2X7 Samtec SSW-107-02-T-D-RA
18 4 R9, R12–R14 R0805 Std Std
FB1, FB2,
FB3, FB4
C3, C5,
C11–C14,
C17–C20
1812 Mouser 623-2743019447 Ferrite bead
C0805 KEMET C0805C104K5RAC7800
IC, 2 PORT USB HUB with
FUN CONTR, 64 pin
Capacitor, ceramic, 0.1-µF,
50 V , X7R, 10%
Capacitor, ceramic, 1.0-µF,
16 V , 20%
Capacitor, ceramic, 22-pF,
50 V , 5%
Capacitor, ceramic,
33 pF, 16 V , 20%
Capacitor, tantalum,
100 µF, 16 V, 20%
Capacitor, tantalum,
4.7 µF, 10 V, 20%
Connector, USB down-
stream (Type A)
Connector, USB
upstream (Type B)
Crystal, 12 MHz, 20 pF, ±50
PPM at 25°C
Diode, LED, green, 2.1 V ,
14.2-mcd, 20 Ma, 0805
Diode, LED, red, 2.1 V ,
14.2-mcd, 20 Ma, 0805
Header, 2 pin, 100 mil spac-
ing, 36-pin strip
Header, 2x7 RT ANG. pin,
100 mil
Resistor, chip, 15 kΩ,
1/10 W, 5%
Bill of Materials
4-1
Page 18
Table 4–1. EVM Bill of Materials (Continued)
Item Qty Ref. Des. Footprint MFR Part Number Description
19 10 R29–R38 R0805 Std Std
20 2 R15, R17 R0805 Std Std
21 2 R16, R25 R0805 Std Std
22 1 R24 R0805 Std Std
23 2 R20, R21 R0805 Std Std
R10, R11,
24 6
25 2 R27, R28 R0805 Std Std
26 1 R23 R0805 Std Std
27 8 R1–R8 R0805 Std Std
28 1 XU1 8 DIP Digi-Key 24LC64P
29 1 XU1 8 pin socket Digi-Key 110-99-308-41-001
30 1 S1 NC Digi-Key P80075-ND Switch, 1P1T, 20 mA, 15 V
31 18
32 1 TP14 TP_BLACK_1MM Farnell 240-333 Test pint, black, 1 mm
33 1 Q1 SOT-23 On Semi TR-MMBT3906LT1
R18, R19,
R22, R26
TP7–TP13,
TP15–25
R0805 Std Std
TP_RED_1MM Farnell 240-345 Test pint, red, 1 mm
Resistor, chip, 0 Ω, 1/10 W,
5%
Resistor, chip, 1 kΩ,
1/10 W, 5%
Resistor, chip, 1.5 kΩ,
1/10 W, 5%
Resistor, chip, 10 Ω,
1/10 W, 5%
Resistor, chip, 20 kΩ,
1/10 W, 5%
Resistor, chip, 30 Ω,
1/10 W, 5%
Resistor, chip, 30.1 kΩ,
1/10 W, 5%
Resistor, chip, 200 kΩ,
1/10 W, 5%
Resistor, chip, 511 Ω,
1/10 W, 5%
IC serial EEPROM 8K x 8
2.5 V
IC socket 8 pin MS Tin/
Tin.300
Bipolar, PNP, 40 V, 350 mA,
zz W
4-2
Page 19
Figure 5–1.TPS2149 Silk Screen
Chapter 5
EVM Layout
EVM Layout
5-1
Page 20
Figure 5–2.Schematic
J1
1
2
P3.1
511 Ω
R3
SUSP
D1
P3.0
J2
1
2
511 Ω
R7
1011121314
DGND
123456789
J3
DVCC_33
1.8 V
J4
1011121314
123456789
DVCC_33
DVCC_33
33 SUSP
DVCC_33
DGND
C1 C2
P0.0
GND
DM1
0.1 µ F0.1 µ F
C20
R16 1.5 KΩ
P1.7
P1.6
VCC
VREN
VDDOUT
U4
TUSB2136PM
SDA
VCC
S3S2DP1
10111213141516
S2
S3
DVCC_33
1 kΩ
1 kΩ
R17
R15
DVCC_33
333435363738394041424344454647
P1.5
P1.4
P1.3
P1.2
P1.1
P1.0
P2.7
P2.6
P2.5
P2.4
P2.3
P2.2
GND
P2.1
P2.0
SELF/BUS
GND
DM0
DP0
PUR
SUSP
TEST1
TEST0
RST
SCL
SUSP
R20 20 kΩ
R21 20 kΩ
33 SUSP
DGND
C10
22 pF
R14
15 kΩ
R19
C9
30 Ω
22 pF
R13
15 kΩ
R18
30 Ω
C8
22 pF
R12
15 kΩ
R11
30 Ω
R10 30 Ω
15 kΩ
R9
C7
22 pF
DGND
30
R22
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
R24
200 kΩ
R26
30 Ω
R25
1.5 KΩ
DGND
3 B
4 B
33 SUSP
S1
1 A
2 A
10 Ω
R23
C11
0.1 µF
DGND
DVCC_33
FB3
FB4
FB2
FB1
Power
R38
DGND
R27
J5
Case
0 Ω
V+
1
DM
2
DP
3
V–
4
Case
R35 0 Ω
R34 0 Ω
V–
DP
DM
V+
V+
DM
DP
V–
DGND
R33 0 Ω
R32 0 Ω
R31 0 Ω
R30 0 Ω
C16
+
100µ F100µ F
+
C15
P3.0
P3.1
30.1 kΩ
S2
S3
Case
4
3
2
1
Case
J7
Case
1
2
3
4
Case
J6
DGND
511ΩR1511Ω
R2
D2 D3 D4 D5 D6 D7
511Ω
Q1
X1
12 MHz OSC
33 pF 33 pF
U1
123
Power
C3
C5
0.1 µF
100µ F
DGND
DGND
C4
+
4.7 µF
R4
876
EN1
OUT1
0 Ω
R37
C6
2
1.8 V
NC
4
EN2
VIN
0.1 µ F
GND3GND
LDO
5
OC
LDO_OUT
4
0 Ω
0 Ω
R36
R29
1
5
GND DGND
OUT2
U2
511ΩR6511ΩR5511Ω
R8
DGND
DVCC_33
1.8 V
P3.1
P3.0
0.1 µF
0.1 µF
C12
XU1
64 63 62 61 60 59 58 47 56 55 54 53 52 51 50 49
876
EEPROM
123
DGND
0.1 µF
C13
48
P0.5
P0.4
P0.3
P0.2
P0.6
P0.7
P3.7
P3.6
P3.5
P3.4
P3.3
P3.2
P3.1/S1
P3.0/S0
GND
X2
X1
VCC
DM2
DP2
OVCR1
PWR01
PWR02
OCYR2
123456789
33 SUSP
DGND
5
GND
GND
GND
GND
GND
4
0.1 µF
0.1 µF
0.1 µF
0.1 µ F
C14
C17
C18
C19
P0.1
GND
DGND
DVCC_33DGND
5-2
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