Texas Instruments bq2023EVM-001 User manual

 
  
May 2002 High Performance Analog Products
User’s Guide
SLUU112

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 2002, Texas Instruments Incorporated

EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
Thisevaluationkit being soldbyTI is intendedforuse 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.
ShouldthisevaluationkitnotmeetthespecificationsindicatedintheEVMUser’sGuide,thekitmaybereturned
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,ORSTATUTORY,INCLUDINGANYWARRANTY OF MERCHANTABILITY ORFITNESSFORANY
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
receivedmaynotberegulatorycompliant oragency certified (FCC,UL, CE,etc.). Dueto theopen construction
oftheproduct,itistheuser’sresponsibilitytotakeanyandallappropriateprecautionswithregardtoelectrostatic
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 Warnings and Restrictions notice in the EVM
User’sGuidepriortohandlingtheproduct.Thisnoticecontainsimportantsafetyinformationabouttemperatures
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 2002, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 2.8–5.5 V and the output
voltage range of 2.8 V and 5.5 V.
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
70°C.TheEVM isdesignedto operateproperlywith certaincomponentsabove 70°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 2002, Texas Instruments Incorporated

Contents
v
WARNING
Thisequipmentis intendedfor useina laboratorytest environmentonly. Itgenerates, uses,and
canradiateradiofrequencyenergyandhasnotbeentestedforcompliancewiththelimitsofcom-
putingdevicespursuant to subpartJof part 15ofFCC rules, whicharedesigned to providerea-
sonableprotectionagainstradiofrequencyinterference.Operationofthisequipmentinotheren-
vironmentsmaycauseinterferencewithradiocommunications,inwhichcasetheuserathisown
expensewillberequiredtotakewhatevermeasuresmayberequiredtocorrectthisinterference.

vi

Contents
vii
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Kit Contents 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Ordering Information 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Circuit Module 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Pin Descriptions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Schematic 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Board Layout 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Bill of Materials 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 Performance Specifications 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 EVM Hardware and Software Setup 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Software Installation 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Hardware Connection 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.1 Connecting the Circuit Module to a Battery Pack 3-2. . . . . . . . . . . . . . . . . . . . . . . . .
3.2.2 PC Interface Connection 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Operation 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Starting the Program 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Initialization 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.1 Setting the Programmable bq2023 Wake-Up Threshold Option 4-3. . . . . . . . . . . .
4.2.2 Register Clearing 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Reading and Writing Flash Memory 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.1 The FED Register 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4 RAM Addressing 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5 Data Logging 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables
viii
Figures
2–1 Schematic 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Board Layout 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1 Connection to Cells and System Load/Charger 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–1 Initial Data Screen 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–2 Communications (Comm) Port Selection Warning Screen 4-2. . . . . . . . . . . . . . . . . . . . . . . . . .
4–3 Flash Register Screen 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–4 RAM Register Screen 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
1–1 Ordering Information 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1 Bill of Materials 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Performance Specifications Summary 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1 Connection to EV2201 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
Introduction
The bq2023EVM–001 is a complete evaluation system for the bq2023
flash-based battery-monitoring IC circuit module, a current sense resistor, an
EV2201 PC interface board for gas-gauge evaluation, a PC serial cable, and
Windows-based PC software. The circuit module includes one bq2023 and
allothercomponentsonboard necessarytomonitorcapacityand othercritical
parametersinaone-cellLi-Ionbatterypackorabatterypackofany chemistry
with a voltage of 2.8–5.5 V. The circuit module connects directly across the
cell(s) in the battery. With the EV2201 interface board and software, the user
can read the bq2023 data registers and evaluate the functions of the bq2023
under different charge and discharge conditions.
Topic Page
1.1 Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Kit Contents 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Ordering Information 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windows is a trademark of Microsoft Corporation. All other trademarks are
the property of their respective owners.
Chapter 1

Features
1-2
1.1 Features
-Complete evaluation system for the bq2023 battery monitor
-Populated circuit module for quick setup
-PC software and interface board for easy evaluation
-Software that allows data logging for system analysis
1.2 Kit Contents
-bq2023 circuit module with sense resistor
-EV2201 PC interface board
-Set of evaluation software disks entitled EV2201–23
-PC serial cable
-Set of support documentation
1.3 Ordering Information
Table 1–1.Ordering Information
EVM Part Number Additional ICs Chemistry Pack Voltage Capacity
bq2023EVM–001 None All 2.8–5.5 V Any
bq2023EVM–002 UCC3952 Li-Ion 2.8–4.2 V Any

2-1
Circuit Module
Circuit Module
The bq2023EVM–001-based circuit module is a complete and compact
example solution of a circuit for battery monitoring of a single-cell Li-Ion pack.
The circuit module incorporates a bq2023 battery-monitor IC and all other
componentsnecessarytoaccuratelymonitorthechargeanddischargeofone
Li-Ion cell or a battery pack of any chemistry with a voltage of 2.8–5.5 V.
Terminal blocks on the circuit module provide direct connection to the cell(s)
(BAT+, BAT–), and the serial communications port (SDQ). The system load
and charger connect across PACK+ and PACK–.
Topic Page
2.1 Pin Descriptions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Schematic 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Board Layout 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Bill of Materials 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 Performance Specifications 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

Pin Descriptions
2-2
2.1 Pin Descriptions
BAT+ cell positive
BAT–cell negative
PACK+ pack positive
PACK–pack negative
SDQ serial communications port
PDET pack removal detection
STAT status output
2.2 Schematic
Figure 2–1 is the schematic diagram for the bq2023EVM–001 circuit module
(SLUP142–001).
Figure 2–1.Schematic
J1
12 PACK+
BAT+
R2
100 kΩ
U1
BQ2023PW
R10
100 Ω
RBI STAT
VCC SRP
VSS SRN
SDQ PDET
81
72
63
54
R7
100 kΩ
PACK–
BAT–
J3
1
2
J4
2
1
SDQ
D3
5.6 V
R8
0.02 Ω
C3
0.1 µF
R9
100 kΩ
C2
0.1 µF
R11
100 Ω
C4
0.1 µF
C1
0.1 µF
R1
1 MΩSTAT PDET
R4
100 Ω
R3
100 Ω
R6
100 Ω
R5
100 Ω
D1
5.6 V
D2
5.6 V
J2 1
2
Optional Components

Board Layout
2-3
Circuit Module
2.3 Board Layout
Figure 2–2 shows the PCB layers and assembly drawing for the
bq2023EVM–001 circuit module (SLUP142–001).
Figure 2–2.Board Layout
Top Layer
Silk 1
Layer 1

Board Layout
2-4
Figure 2–2.Board Layout (continued)
Layer 2
Mask 1
Mask 2

Bill of Materials
2-5
Circuit Module
2.4 Bill of Materials
Table 2–1 lists the materials required for the bq2023EVM–001 circuit module
(SLUP142–001).
Table 2–1.Bill of Materials
Ref Des Qty-001 Description MFG MFG PART# Size
PCB 1 Printed-circuit board, 0.031, FR4,
SMOBC, HASL Any SLUP142
Terminal 4 Terminal block 3,5 mm On Shore
Technology ED555/2DS 3,5 mm ×2
C1, C2, C3,
C4 4Capacitor, ceramic, 0.1 µF, 16 V,
±10%, X7R Panasonic ECJ–1VB1C104K 603
R8 1 Resistor, 0.020 Ω, 1 W, 1% IRC LR2512–01–R020–G 2512
R2, R7, R9 3Resistor, 100 kΩ, 1/16 W, 5% Panasonic ERJ–3GSYJ104 603
R3, R4, R5,
R6, R10, R11 6Resistor, 100 Ω, 1/16 W, 5% Venkel ERJ–3GSYJ101 603
R1 1 Resistor, 1 MΩ, 1/16 W, 5% Panasonic ERJ–3GSYJ105 603
D1, D2, D3 3Diode, Zener, 5.6 V Zetex BZX84C5V6 SOT–23
U1 1 Integrated circuit, gas gauge,
bq2023 Benchmarq/TI bq2023PW TSSOP–8
Component
count 24
Assembly Notes:
1) This assembly is ESD sensitive.
2) This assembly shall comply with IPC–A–610 class 2 or better.
3) This assembly must be clean of flux residues and contaminants.
4) Use of no-clean flux is not acceptable.
2.5 Performance Specifications
Table 2–2 summarizes the performance specifications for bq2023–001 Cir-
cuit Module (SLUP142–001).
Table 2–2.Performance Specifications Summary
Specification Min Typ Max Units
Input voltage BAT+/BAT–2.8 5.5 V
Charge and discharge current 3 A
Note: ChargeanddischargemaximumsarelimitedbythePCBdesignandpowerdissipationof
the 20-mΩ0.5-W sense resistor in the kit.

2-6

3-1
EVM Hardware and Software Setup
This section describes how to install the bq2023EVM–001 PC software and
how to connect the components of the EVM.
Topic Page
3.1 Software Installation 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Hardware Connection 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3

3-2
3.1 Software Installation
The following steps install the bq2023EVM–001 software:
1) Insert disk 1 into a 3 1/2 inch floppy drive.
2) Select the 3 1/2 inch drive using My Computer.
3) Double-click the setup.exe icon.
The setup program prompts for the remaining disks and installs a Windows
application group.
3.2 Hardware Connection
There are three hardware components to the bq2023EVM–001:
1) bq2023EVM–001 circuit module
2) EV2201 PC interface board
3) PC
3.2.1 Connecting the Circuit Module to a Battery Pack
Figure 3–1 shows how to connect the bq2023EVM–001 circuit module to a
stack of cells, the sense resistor, and the system load/charger.
Figure 3–1.Connection to Cells and System Load/Charger
Battery Pack
PACK–PACK+
Charger
Load
bq2023EVM–001
Circuit Module
BAT-
PACK-
BAT+
Cell
PACK+

3-3
3.2.2 PC Interface Connection
The following steps configure the hardware for interface to the PC:
1) Connectthebq2023-basedsmartbatteryto the EV2201, usingwireleads
as in Table 3–1.
2) Connect the PC serial cable to the EV2201 and the PC COM port.
Table 3–1.Connection EV2201
bq2023-Based Battery EV2201
SDQ SMBD/HDQ1
PACK–VSS
The bq2023EVM–001 is now set up for operation.

3-4