User's Guide
SLUU174A – March 2006 – Revised October 2013
bq26500EVM Single-Cell Battery Fuel Gauge Evaluation
Module
The bq26500EVM is a complete evaluation system for the bq26500 single cell Li-Ion and Li-Polymer
battery gas gauge device. The EVM includes one bq26500 circuit module, CD ROM including Windows®based PC software and support documentation. An EV2300 board for gas gauge evaluation is required to
interface this EVM with the PC and can be purchased separately.
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3
4
5
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7
8
Contents
Introduction ..................................................................................................................
bq26500EVM-Based Circuit Module .....................................................................................
bq26500EVM Circuit Module Schematic .................................................................................
Circuit Module Physical Layouts ..........................................................................................
bq26500EVM Circuit Module List of Materials ..........................................................................
bq26500EVM Circuit Module Performance Specification Summary .................................................
EVM Hardware and Software Setup .....................................................................................
Operation .....................................................................................................................
2
3
4
5
7
7
7
9
List of Figures
1
bq26500EVM Circuit Module Schematic .................................................................................
2
bq26500EVM Topside Assembly .........................................................................................
5
3
bq26500EVM Silkscreen ...................................................................................................
5
4
bq26500EVM Layer 1 Layout
.............................................................................................
bq26500EVM Layer 2 Layout .............................................................................................
bq26500EVM Circuit Module Connection to Cells and System Load/Charger .....................................
Initial Register Screen ......................................................................................................
EEPROM Screen ..........................................................................................................
Pro Screen .................................................................................................................
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5
6
7
8
9
4
6
8
9
10
11
List of Tables
1
bq26500EVM Ordering Information.......................................................................................
2
2
bq26500EVM Test Points ..................................................................................................
3
3
bq26500EVM Bill of Materials .............................................................................................
7
4
Performance Specification Summary.....................................................................................
7
5
Circuit Module-to-EV2300 Connection ...................................................................................
8
6
Example Data Log .........................................................................................................
12
Windows is a registered trademark of Microsoft Corporation.
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1
Introduction
1
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Introduction
The bq26500EVM is a complete evaluation system for the bq26500 single cell Li-Ion and Li-Polymer
battery gas gauge device. The EVM includes one bq26500 circuit module, CD ROM including Windowsbased PC software and support documentation. An EV2300 board for gas gauge evaluation is required to
interface this EVM with the PC and can be purchased separately. The circuit module includes one
bq26500, a current sense resistor and all other components on-board necessary to calculate remaining
battery capacity and predict at rate time to empty. The circuit module connects directly across the cell in a
battery. With the PC interface board and software, the user can read the bq26500 data registers, program
the on-chip configuration EEPROM, and evaluate the functions of the bq26500 under different charge and
discharge conditions.
1.1
Features
•
•
•
•
1.2
Complete evaluation system for the bq26500 battery gas gauge
Populated circuit module for quick setup
PC software and interface board for easy evaluation
Software allows EEPROM programming and data logging for system analysis
Kit Contents
1. bq26500 circuit module with sense resistor
2. CD ROM including Windows-based PC software and support documentation
3. Set of support documentation
1.3
Ordering Information
Table 1 contains the ordering information for the EVM
Table 1. bq26500EVM Ordering Information
2
EVM Part Number
PC Interface Board
Chemistry
Pack Voltage
Capacity
bq26500EVM−001
USB
Li-Ion
2.6 V to 4.5 V
100 to 2000 mah
bq26500EVM Single-Cell Battery Fuel Gauge Evaluation Module
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bq26500EVM-Based Circuit Module
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2
bq26500EVM-Based Circuit Module
The bq26500EVM based circuit module is an example circuit for battery fuel gauging of a single cell LiIon/Li-Polymer battery pack. There are two separate circuits on the EVM module. One is the active
bq26500 fuel gauging circuitry; the other is the logic and power control to program the on-chip
configuration EEPROM of the bq26500. In a typical application, only the active fuel gauging circuitry is
required. The EEPROM programming circuitry would be required in a test setup to configure the bq26500
for the application by programming the EEPROM.
Contacts on the circuit module provide direct connection to the cell (J1−1, J2−2), the serial
communications port (J1−3). The system load and charger connect across J1−1 and J2−1.
2.1
Test Points
Table 2 describes the EVM test points and lists their signal names.
Table 2. bq26500EVM Test Points
Test Point
Signal Name
description
J1−1
PACK+
Cell positive/pack positive
J1−2
GPIO
GPIO pin of the bq26500
J1−3
HDQ
Serial communications port
J2−1
PACK−
Pack negative
J2−2
BAT−
Cell negative
J3−1
21V
High voltage for EEPROM programming
J3−2
PROG
Input for timing of EEPROM programming
pulse
J3−3
VSS
Programming ground
J4
1−2 jumper position for programming EEPROM
2−3 jumper position for normal bq26500 operation (fuel
gauging)
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bq26500EVM Circuit Module Schematic
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bq26500EVM Circuit Module Schematic
Figure 1 shows the circuit module schematic diagram.
Figure 1. bq26500EVM Circuit Module Schematic
4
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Circuit Module Physical Layouts
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4
Circuit Module Physical Layouts
This chapter contains the board layout and assembly drawings for the bq26500EVM circuit module.
4.1
Board Layout
Figure 2 through Figure 5 show the PCB layers and assembly drawing for the bq26500EVM circuit
module.
Figure 2. bq26500EVM Topside Assembly
Figure 3. bq26500EVM Silkscreen
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Circuit Module Physical Layouts
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Figure 4. bq26500EVM Layer 1 Layout
Figure 5. bq26500EVM Layer 2 Layout
6
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bq26500EVM Circuit Module List of Materials
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5
bq26500EVM Circuit Module List of Materials
Table 3 displays the EVM bill of materials.
Table 3. bq26500EVM Bill of Materials
6
Ref
Designators
QTY
Description
MFR
Part Number
C1, C2, C3, C4
4
Capacitor, ceramic, 0.1 µF, 16 V, X7R, 603
muRata
GRM39X7R104K16
D1
1
Diode, Zener, 22 V, 350 mW, SOT23
Diodes, Inc.
BZX84C22
D2, D3
2
Diode, Zener, 5.6 V, 350 mW, SOT23
Diodes, Inc.
BZX84C5V6T
Q1
1
MOSFET, N-channel, 2N7002, 60 V, 115 mA, 1.2 Ω,
SOT23
Vishay−Liteon
2N7002DICT
Q2
1
MOSFET, P-channel, ZVP3306F, −60 V, 0.09 A, 14 Ω,
SOT23
Zetex
ZVP3306F
R1, R2, R4, R5,
R11
5
Resistor, chip, 100 Ω, 1/16 W, 5%, 603
Std
Std
R13, R14
2
Resistor, Chip, 1 M, 1/16 W, 5%, 603
Std
Std
R6, R7, R12
3
Resistor, Chip, 100 kΩ, 1/16 W, 5%, 603
Std
Std
R8
1
Resistor, Chip, 0.020 Ω, 1/2 W, 2%, 2010
Dale
WSL2010−R020
U1
1
Single cell Li-Ion/Polymer gas gauge device, TSSOP−08
Texas Instruments
bq26500PW
J1, J3
2
Terminal blocks, 3 position
OST
ED1515
J2
1
Terminal blocks, 2 position
OST
ED1514
J4
1
Header, 3-pin, 100-mil spacing, (36-pin strip)
Sullins
PTC36SAAN
N/A
1
Shunt
Any
HPA033
N/A
1
PCB
Any
HPA033
bq26500EVM Circuit Module Performance Specification Summary
This section summarizes the performance specifications of the bq26500EVM circuit module. Table 4 gives
the performance specifications of the circuit.
Table 4. Performance Specification Summary
Specification
MIN
Input Voltage PACK+/BAT−
2.6
TYP
Charge and Discharge Current
(1)
7
MAX
Units
4.5
V
3 (1)
A
Charge and discharge max. is limited by the PCB design and power dissipation of the 20-mΩ, 1/2-W sense resistor, included in
the kit.
EVM Hardware and Software Setup
This section describes how to install the bq26500EVM PC software and how to connect the different
components of the EVM.
7.1
Software Installation
Install the bq26500 evaluation software with steps through through :
1. Insert CD ROM into a CD ROM drive.
2. Select the CD ROM drive using My Computer or File Manager.
3. Select the ReadMeFirst.txt file.
4. Follow the instructions to install USB drivers for EV2300.
5. After installing the USB drivers for EV2300, double-click on the Setup.exe icon.
6. The setup program installs a windows application group.
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EVM Hardware and Software Setup
7.2
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Hardware Connection
The three hardware components to the bq26500EVM are:
• The bq26500EVM circuit module,
• The PC interface board,
• And the PC
7.2.1
Connecting the bq26500EVM Circuit Module to a Battery Pack
Figure 6 shows how to connect the bq26500EVM circuit module to a Li-Ion cell and the system
load/charger.
Figure 6. bq26500EVM Circuit Module Connection to Cells and System Load/Charger
7.2.2
PC Interface Connection
The following steps configure the hardware for interface to the PC:
1. Connect colored wires that are included with EV2300 to bq26500EVM using Table 5 as a guide.
2. Connect the connector with colored wires to the HDQ connector that is on EV2300. HDQ connection is
located on the top right of EV2300.
3. Connect the PC USB cable to the EV2300 and the PC USB port.
The bq26500EVM is now set up for operation.
Table 5 lists the circuit module-to-EV2300 connections.
Table 5. Circuit Module-to-EV2300 Connection
(1)
8
bq26500EVM
Color
HDQ
BROWN
PACK−
BLACK
PROG
WHITE
PACK+ (1)
RED
This connection is not useful when using a system load, charger or a power source (battery or external power supply).
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Operation
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8
Operation
This section details the operation of the bq26500EVM software.
8.1
Starting the Program
Run the program from the Start→Programs→Texas Instruments→bq26500 Battery Monitor menu
sequence. The software defaults to PC USB port for communication. If the EV2300 is connected to USB
port, the program should load and display the initial data screen as shown in Figure 7.
Figure 7. Initial Register Screen
If the EV2300 is not connected to a USB port, the program will display a USB error message and then
display the initial data screen with no data in the register locations.
The com port can be changed by selecting the port under the options menu.
8.2
Initialization
This section describes the settings that must be made before the bq26500 is evaluated.
8.2.1
Loading the Sense Resistor Value
The bq26500EVM comes with a 20-mΩ sense resistor on the circuit board. Make sure the sense resistor
value is entered in the RS box at the top of the initial register screen. This value is used by the PC
program to convert the bq26500 data set to engineering units. Checking the display engineering units box
displays the data set in engineering units. No check mark displays the data set just as the bq26500
calculates them, ie, in units of 3.0-µVh counts.
8.2.2
Programming the bq26500 EEPROM
Each bq26500 is programmed at the factory with default values in the EEPROM. The values in EEPROM
should be changed to match specific applications. The EEPROM values can be read by using the
EEPROM screen (Figure 8).
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Operation
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Figure 8. EEPROM Screen
The values in the EEPROM can be easily changed using the EVM’s auto programming feature. To use the
auto program feature:
1. Make sure VOUT of the EV2300 is connected to PROG of the EVM.
2. Connect a 21-V supply across 21 V (J3−1) and VSS (J3−3).
3. Click on the use auto-programming box to enable auto EEPROM programming.
To change the EEPROM values simply click on the value to be changed, enter the new value, and press
enter.
The EEPROM values can be stored in a file on the PC by using the File|Save Gas Gauge Flash
Constants command from the pull down menu. Similarly, a saved file can be load by using the File|Open
Gas Gauge Flash Constants command. Once the file is called up, the Write all EEPROM button can be
used to write all the EEPROM values at once.
NOTE: Changing EEPROM data affects critical aspects of the bq26500 operation. Please review the
bq26500 data sheet to determine how to develop new data for the EEPROM based on your
application. It is recommend to first save the default EEPROM data as a file first before
changing the data. In this way, the default data programming can easily be restored.
The bq26500 automatically uses the new EEPROM in its calculations, once programmed.
8.2.3
Resetting the bq26500
The bq26500 can be reset at anytime by using the Options|Special Options|Reset bq26500 from the
pulldown menu. When reset, the bq26500 loads the configuration values from EEPROM and set the
remaining capacity registers to zero.
10
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Operation
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8.3
Configuring the Register Screen
The register screen has options for setting which data set values are to be scanned by the program.
Scanning can be turned on or off using the Options→Scan pull down command. The items to be scanned
are set by clicking on the corresponding Scan box in each row of data. A check mark in the box indicates
that that data item will be scanned and updated on the PC display.
8.4
The Pro Screen
The pro screens allows the data location in the bq26500 to be addressed individually by entering the
address to be read or the address and data to be written.
Figure 9. Pro Screen
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Operation
8.5
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Data Logging
The bq26500 registers can be logged by using the data log function. To log the data and create a log file:
1. Select the registers to log by clicking on the corresponding Log box in each row of data.
2. File→Start Data Log from the pull-down menu.
3. Enter the name of the data log file in the Name Datalog File box.
4. Click on the Open button.
5. To stop the data logging select File→Close Data Log from the pull-down menu.
The file can be imported into a text editor, spreadsheet, or word processor program.
Table 6. Example Data Log
12
Sample
Stamp
Elapsed (s)
Voltage
NAC
Temp Comp
1
3:31:30
10
3829
1084.58
1084.58
2
3:31:40
20
3829
1086.26
1086.26
3
3:31:50
30
3832
1087.48
1087.48
4
3:32:00
40
3800
1087.48
1087.48
5
3:32:10
50
3786
1087.48
1087.48
6
3:32:20
60
3786
1087.48
1087.48
7
3:32:30
70
3630
1087.78
1087.78
8
3:32:40
80
3622
1084.12
1064.91
9
3:32:50
90
3614
1081.68
1062.47
10
3:33:00
100
3609
1078.02
1060.03
11
3:33:10
110
3603
1075.74
1033.34
12
3:33:20
120
3754
1075.74
1033.34
13
3:33:30
130
3762
1075.74
1033.34
14
3:33:40
140
3765
1075.74
1033.34
15
3:33:50
150
3767
1075.74
1033.34
16
3:34:00
160
3622
1073.91
1032.73
17
3:34:10
170
3609
1072.69
1032.73
18
3:34:20
180
3598
1070.25
1032.73
19
3:34:30
190
3593
1065.52
1032.73
20
3:34:40
200
3695
1065.52
1032.73
21
3:34:50
210
3810
1065.52
1032.73
22
3:35:00
220
3810
1065.52
1032.73
23
3:35:10
230
3813
1065.52
1032.73
24
3:35:20
240
3767
1065.52
1032.73
bq26500EVM Single-Cell Battery Fuel Gauge Evaluation Module
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EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS
Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions:
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.
Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from
the date of delivery for a full refund. THE FOREGOING LIMITED 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. 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.
Please read the User's Guide and, specifically, the Warnings and Restrictions notice in the User's Guide prior to handling the product. This
notice contains important safety information about temperatures and voltages. For additional information on TI's environmental and/or safety
programs, please visit www.ti.com/esh or contact TI.
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. 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.
REGULATORY COMPLIANCE INFORMATION
As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompanying hardware may or may not be subject to the Federal
Communications Commission (FCC) and Industry Canada (IC) rules.
For EVMs not subject to the above rules, this evaluation board/kit/module is intended for use for ENGINEERING DEVELOPMENT,
DEMONSTRATION OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end product fit for general consumer
use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing
devices pursuant to part 15 of FCC or ICES-003 rules, which are designed to provide reasonable protection against radio frequency
interference. Operation of the equipment 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.
General Statement for EVMs including a radio
User Power/Frequency Use Obligations: This radio is intended for development/professional use only in legally allocated frequency and
power limits. Any use of radio frequencies and/or power availability of this EVM and its development application(s) must comply with local
laws governing radio spectrum allocation and power limits for this evaluation module. It is the user’s sole responsibility to only operate this
radio in legally acceptable frequency space and within legally mandated power limitations. Any exceptions to this are strictly prohibited and
unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory
authorities, which is responsibility of user including its acceptable authorization.
For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant
Caution
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the
equipment.
FCC Interference Statement for Class A EVM devices
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be required to correct the interference at his own expense.
FCC Interference Statement for Class B EVM devices
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
For EVMs annotated as IC – INDUSTRY CANADA Compliant
This Class A or B digital apparatus complies with Canadian ICES-003.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the
equipment.
Concerning EVMs including radio transmitters
This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this
device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired
operation of the device.
Concerning EVMs including detachable antennas
Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain
approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should
be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication.
This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum
permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain
greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.
Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada.
Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de
l'utilisateur pour actionner l'équipement.
Concernant les EVMs avec appareils radio
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est
autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout
brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
Concernant les EVMs avec antennes détachables
Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain
maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à
l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente
(p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante.
Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le manuel
d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans
cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur.
SPACER
SPACER
SPACER
SPACER
SPACER
SPACER
SPACER
SPACER
【Important Notice for Users of EVMs for RF Products in Japan】
】
This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan
If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product:
1.
2.
3.
Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and
Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for Enforcement of Radio Law of
Japan,
Use this product only after you obtained the license of Test Radio Station as provided in Radio Law of Japan with respect to this
product, or
Use of this product only after you obtained the Technical Regulations Conformity Certification as provided in Radio Law of Japan with
respect to this product. Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note
that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan.
Texas Instruments Japan Limited
(address) 24-1, Nishi-Shinjuku 6 chome, Shinjuku-ku, Tokyo, Japan
http://www.tij.co.jp
【無線電波を送信する製品の開発キットをお使いになる際の注意事項】
本開発キットは技術基準適合証明を受けておりません。
本製品のご使用に際しては、電波法遵守のため、以下のいずれかの措置を取っていただく必要がありますのでご注意ください。
1.
2.
3.
電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用いただく。
実験局の免許を取得後ご使用いただく。
技術基準適合証明を取得後ご使用いただく。
なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。
上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。
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EVALUATION BOARD/KIT/MODULE (EVM)
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