User's Guide
SLUUBE1 – December 2015
bq27426EVM-738 EVM: Single-Cell Impedance Track
Technology
This evaluation module (EVM) is a complete evaluation system for the bq27426. The EVM includes one
bq27426 circuit module with an integrated current-sense resistor. A separated orderable EV2300 or
EV2400 PC interface board for gas gauge interface along with a PC USB cable, and Windows®-based PC
software is needed when using this EVM. The circuit module includes one bq27426 integrated circuit and
all other onboard components necessary to monitor and predict capacity for a system-side fuel gauge
solution. The circuit module connects directly across the battery pack. With the EV2300 or EV2400
interface board and software, the user can:
• Read the bq27426 data registers
• Update the RAM for different configurations
• Log cycling data for further evaluation
• Evaluate the overall functionality of the bq27426 solution under different charge and discharge
conditions
The latest Windows-based PC software can be downloaded from the product folder on the Texas
Instruments Web site.
1
2
3
4
5
6
7
8
Contents
Features ....................................................................................................................... 2
1.1
Kit Contents.......................................................................................................... 2
1.2
Ordering Information ............................................................................................... 2
bq27426-Based Circuit Module ............................................................................................ 3
2.1
Circuit Module Connections ....................................................................................... 3
2.2
Pin Description ...................................................................................................... 3
Circuit Module Physical Layout, Bill of Materials and Schematic...................................................... 4
3.1
Board Layout ........................................................................................................ 4
3.2
Bill of Material ....................................................................................................... 5
3.3
Schematic ............................................................................................................ 6
3.4
bq27426 Circuits Module Performance Specification Summary .............................................. 7
EVM Hardware and Software Setup ...................................................................................... 7
4.1
System Requirements .............................................................................................. 7
4.2
Software Installation ................................................................................................ 7
Troubleshooting Unexpected Dialog Boxes .............................................................................. 7
Hardware Connection ....................................................................................................... 8
6.1
Connecting the bq27426 Circuit Module to a Battery Pack ................................................... 8
6.2
PC Interface Connection ........................................................................................... 8
Operation ..................................................................................................................... 9
7.1
Starting the Program ............................................................................................... 9
7.2
Setting Programmable bq27426 Options ...................................................................... 10
7.3
Setting the Chemistry ............................................................................................. 11
Related Documentation from Texas Instruments ...................................................................... 11
List of Figures
1
bq27426EVM Layout – Top Silk ........................................................................................... 4
Windows, Microsoft are registered trademarks of Microsoft Corporation.
I2C is a trademark of NXP.
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Features
2
3
4
5
6
7
8
www.ti.com
........................................................................................ 4
bq27426EVM Layout – Bottom Layer ..................................................................................... 4
bq27426EVM Schematic.................................................................................................... 6
bq27426 Circuit Module Connection to Pack and System Load/Charger ............................................ 8
Registers Screen............................................................................................................. 9
Data Memory Screen ...................................................................................................... 10
Chemistry Screen .......................................................................................................... 11
bq27426EVM Layout - Top Layer
List of Tables
1
2
3
4
1
2
5
7
8
Features
•
•
•
•
1.1
........................................................................................................
Bill of Materials ...............................................................................................................
Performance Specification Summary .....................................................................................
Circuit Module to EV2300 or EV2400 Connections .....................................................................
Ordering Information
Complete evaluation system for the bq27426 gas gauge with Impedance Track™ technology
Populated circuit module for quick setup
Personal computer (PC) software and interface board for easy evaluation
Software that allows data logging for system analysis
Kit Contents
•
bq27426 circuit module (PWR214)
This EVM is used for the evaluation of bq27426. Visit the product Web folder at www.ti.com to properly
configure the bq27426.
1.2
Ordering Information
Table 1. Ordering Information
Part Number
bq27426-G1
2
EVM Part Number
bq27426EVM-738
Firmware Version
Chemistry
v2.02
4.2 V (1202)
4.35 V (3230)
4.4 V (3142)
bq27426EVM-738 EVM: Single-Cell Impedance Track Technology
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bq27426-Based Circuit Module
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2
bq27426-Based Circuit Module
The bq27426 based circuit module is a complete and compact example solution of a bq27426 circuit for
battery management. The circuit module incorporates a bq27426 battery gas gauge integrated circuit (IC)
with external sense resistor to accurately predict the capacity of a 1-series Li-ion cell.
2.1
Circuit Module Connections
Contacts on the circuit module provide the following connections:
• Direct connection to the battery pack (J5): PACK+, PACK–
• To the I2C communications port (J1): SDA, SCL, and VSS
• The system load and charger connect across charger and load (J6 and J7): CHARGER+/LOAD+ and
CHARGER–/LOAD–.
• Access to signal outputs (J2 and J5-2): GPOUT and BIN
• External connect to power the IC (TP4): EXT VCC
2.2
Pin Description
Pin Name
PACK+
PACK–
SDA
EXT VDD
SCL
VSS
CHARGER+/LOAD+
CHARGER–/LOAD–
BIN
GPOUT
Description
Pack positive terminal
Pack negative terminal
I2C™ communication data line
External supply connection
I2C communication clock line
Signal return for communication line, shared with charger and ground
High potential of load or charger connection
Low potential of load or charger connection (system VSS)
Battery insertion detection input
General purpose output
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Circuit Module Physical Layout, Bill of Materials and Schematic
3
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Circuit Module Physical Layout, Bill of Materials and Schematic
This section contains the board layout, bill of materials, and schematic for the bq27426 circuit module.
3.1
Board Layout
This section shows the printed-circuit board (PCB) layers (Figure 1 through Figure 3), and assembly
drawing for the bq27426 module.
Figure 1. bq27426EVM Layout – Top Silk
Figure 2. bq27426EVM Layout - Top Layer
Figure 3. bq27426EVM Layout – Bottom Layer
4
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Circuit Module Physical Layout, Bill of Materials and Schematic
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3.2
Bill of Material
Table 2. Bill of Materials
Designator
Quantity
PCB
1
Value
Description
C1
1
2.2uF
CAP, CERM, 2.2 µF, 16 V, +/- 10%, X5R, 0805
C2
1
1uF
CAP, CERM, 1 µF, 16 V, +/- 10%, X5R, 0402
C3
1
0.47uF
H1, H2, H3, H4
J1
Package Reference
Printed Circuit Board
Part Number
Manufacturer
PWR738
Any
0805
0805YD225KAT2A
AVX
0402
C1005X5R1C105K050BC
TDK
CAP, CERM, 0.47 µF, 6.3 V, +/- 10%, X5R, 0402
0402
GRM155R60J474KE19D
MuRata
4
Bumpon, Hemisphere, 0.25 X 0.075, Clear
75x250 mil
SJ5382
3M
1
Header (friction lock), 100mil, 4x1, R/A, TH
4x1 R/A Header
22-05-3041
Molex
J2, J3, JP1, JP2
4
Header, 100mil, 2x1, Tin, TH
Header, 2 PIN, 100mil,
Tin
PEC02SAAN
Sullins Connector
Solutions
J4, J6, J7
3
Terminal Block, 6A, 3.5mm Pitch, 2-Pos, TH
7.0x8.2x6.5mm
ED555/2DS
On-Shore Technology
J5
1
Terminal Block, 6A, 3.5mm Pitch, 3-Pos, TH
10.5x8.2x6.5mm
ED555/3DS
On-Shore Technology
R1
1
0.01
RES, 0.01, 1%, 0.25 W, 0805
0805
WSL0805R0100FEA18
Vishay-Dale
R2
1
1.8Meg
RES, 1.8Meg ohm, 5%, 0.063W, 0402
0402
CRCW04021M80JNED
Vishay-Dale
R3
1
5.1k
RES, 5.1k ohm, 5%, 0.063W, 0402
0402
CRCW04025K10JNED
Vishay-Dale
R4, R5
2
10.0k
RES, 10.0 k, 1%, 0.125 W, 0805
0805
CRCW080510K0FKEA
Vishay-Dale
SH-JP1, SH-JP2
2
1x2
Shunt, 100mil, Gold plated, Black
Shunt
969102-0000-DA
3M
TP1, TP2, TP3, TP4,
TP5
5
SMT
Test Point, Compact, SMT
Testpoint_Keystone_Co
mpact
5016
Keystone
U1
1
System-Side Impedance Track Fuel Gauge, YZF0009AKAL
YZF0009AKAL
BQ27426YZFR
Texas Instruments
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Circuit Module Physical Layout, Bill of Materials and Schematic
3.3
www.ti.com
Schematic
Ext VCC
EXT_VCC
TP4
EXT_VCC
J3
GND
VDD
VDD
J4
R2
1.8Meg
PGND
EXT_VCC
BIN
JP1
JP2
EXT_VCC
R3
5.1k
J2
R4
10.0k
J1
4
3
2
1
SDA
SCL
VSS
GPOUT
R5
10.0k
GPOUT
SDA
SCL
VDD
U1
C3
PGND
A3
A2
GPOUT
BIN
A1
B1
BAT
SCL
SDA
VDD
B3
SRP
SRN
C1
C2
TP5
VDD
C3
0.47µF
C1
2.2µF
GPOUT
BIN
VSS
B2
PGND
PGND
BQ27426YZFR
Pack+
PGND
Pack+
BIN
Pack-
1
2
3
TP1
J6
Load+
R1
TP2
Charger+
0.01
BIN
Load+(Host)
J5
C2
1µF
Load-
J7
TP3
ChargerLoad-(Host)
PGND
PGND
Figure 4. bq27426EVM Schematic
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Circuit Module Physical Layout, Bill of Materials and Schematic
www.ti.com
3.4
bq27426 Circuits Module Performance Specification Summary
This section summarizes the performance specifications of the bq27426 circuit module.
Table 3. Performance Specification Summary
4
Specification
Min
Typ
Max
Units
Input voltage Pack+ to Pack–
2.5
3.6
4.5
V
EVM Hardware and Software Setup
This section describes how to install the bq27426EVM PC software and how to connect the different
components of the EVM.
4.1
System Requirements
The bqStudio software requires Windows XP or later. Using later versions of Windows operating system
can have issues with the USB driver support. The EV2300 USB drivers have been tested for Windows
98SE, but no assurance is made for problem-free operation with specific system configurations.
4.2
Software Installation
Find the latest software version of bqStudio on http://www.ti.com/tool/bqstudio. Search by part number for
bq27426 to access the tool folder for the device. Use the following steps to install bq27426 bqStudio
software.
1. Ensure that the EV2300 or EV2400 is not connected to the personal computer (PC) through the USB
cable before starting this procedure.
2. Open the archive containing the installation package, and copy its contents into a temporary directory.
3. Open the bqStudio installer file that was downloaded from the TI Web site.
4. Follow the instructions on screen until completing the software installation.
5. Before starting the evaluation software, connect the EV2300 or EV2400 to the computer using the USB
cable.
6. If EV2300 is connected, wait until system prompt New Hardware Found appears. Choose Select
Location Manually, and use the Browse button to point to subdirectory TIUSBWin2K-XP-1.
7. Answer Continue to the warning that drivers are not certified with Microsoft®.
8. If the EV2300 is connected, after the previous installation finishes, another system prompt New
Hardware Found appears. Repeat steps 1 through 5, but specify the directory as TIUSBWin2K-XP-2.
9. Answer Continue to the warning that drivers are not certified with Microsoft. Driver installation is now
finished.
10. For the EV2400, the driver should be installed along with software installation.
5
Troubleshooting Unexpected Dialog Boxes
The user that is downloading the files must be logged in as the administrator. The driver is not signed, so
the administrator must allow installation of unsigned drivers in the operating system. If using Windows 7,
install the software with administrator privileges.
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Hardware Connection
6
www.ti.com
Hardware Connection
The bq27426 evaluation system comprises three hardware components: the bq27426 circuit module, the
EV2300 or EV2400 PC interface board, and the PC.
6.1
Connecting the bq27426 Circuit Module to a Battery Pack
Figure 5 shows how to connect the bq27426 circuit module to the cells and system load/charger.
Figure 5. bq27426 Circuit Module Connection to Pack and System Load/Charger
6.2
PC Interface Connection
The following steps configure the hardware for interface to the PC.
1. Connect the bq27426-based EVM to the EV2300 or EV2400 using wire leads as shown in Table 4.
2. Connect the PC USB cable to the EV2300 or EV2400 and the PC USB port.
Table 4. Circuit Module to EV2300 or EV2400 Connections
bq27426EVM
EV2300
EV2400
SDA
SDA
SDA
SCL
SCL
SCL
VSS
VSS
VSS
JP1
Short
Open
JP2
Short
Open
EXT_VCC (J4 or TP4)
External supply > 1.8 V
N/A
The bq27426EVM is now set up for operation.
8
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Operation
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7
Operation
This section details the operation of the bq27426 bqStudio software.
7.1
Starting the Program
Run bqStudio from the desktop. The window consists of a tools panel at the top, and other child windows
that can be hidden, docked in various positions or allowed to float as separate windows. When bqStudio
first starts up the Gauge Dashboard window, the Registers window and Data Memory window should be
seen in the main window. Registers, Data Memory, Commands, and other windows can be added to the
main window by clicking on the corresponding icon in the tools panel at the top of the main window. Data
should appear initially in the Gauge Dashboard, Registers and Data Memory sections. The Refresh
(single time scan) or the Scan (continuous scan) buttons can be clicked in order to update the data in the
Registers and Data Memory windows. The continuous scan is enabled when the Scan checkbox is
highlighted green and disabled when the Scan checkbox is not highlighted. The continuous scanning
interval can be set with the stopwatch icon next to the Scan button. When the stopwatch icon is clicked, a
drop-down menu will appear and the desired scanning interval can be selected. The scan interval value
will show up next to the stopwatch icon.
bqStudio provides a logging function which logs selected Data Registers last received from the bq27426.
To enable this function, click the Start Log. The default elapsed interval is 4000 milliseconds, to change
this interval, go to Window, select Preferences, choose Registers, and change Scan/Log Interval from
4000 to 1000 milliseconds. There is no need to log faster than 1 second as the gas gauge will not update
the registers faster than 1 second.
Figure 6. Registers Screen
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Operation
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Figure 6 shows the main bqStudio window. Additional Flag and Control Status data can be viewed at the
bottom of the registers window.
7.2
Setting Programmable bq27426 Options
The bq27426 OTP comes configured per the default settings detailed in the bq27426 data sheet. Ensure
that the settings are correctly changed to match the pack and application for the bq27426 solution being
evaluated.
IMPORTANT: The correct setting of these options is essential to get the best performance. The settings
can be configured using the Data Memory window seen in the main bqStudio window (Figure 7).
Figure 7. Data Memory Screen
To read all the data from the bq27426 OTP, click on the Refresh button in the Data Memory window.
To make a RAM update and write to an OTP location, make sure that the [CFGUPMODE] bit in the Flags
register is set by sending the SET_CFGUPDATE subcommand (0x0013). The SET_CFGUPDATE
subcommand can be sent to the bq27426 in bqStudio by clicking the SET_CFGUPDATE button in the
Commands window. However, bqStudio will handle the update of the OTP parameter(s) automatically so
the user will not have to worry about entering and exiting CONFIG UPDATE mode. To update an OTP
parameter, click on the desired parameter and a window will pop-up that provides details on the selected
OTP parameter. Next, enter the value in the value textbox and press Enter. After Enter has been
pressed, bqStudio will update the selected parameter. Note that the OTP updates are stored in RAM and
a POR or full RESET subcommand (0x0041) will change the OTP back to the default value. The Import
button in the Data Memory window can be clicked in order to import an entire OTP configuration from a
specified *.gg.csv file.
10
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Operation
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The OTP configuration can be saved to a file by clicking the Export button in the Data Memory window
and entering a file name. The OTP configuration will be saved to a *.gg.csv file. The module calibration
data is also held in the bq27426 data Memory. If the Gauge Dashboard is not displaying any information,
then the bq27426 may not be supported by the bqStudio version that is being used, a bqStudio upgrade
may be required.
7.3
Setting the Chemistry
The bq27426 comes pre-programmed with three chemistry IDs. The default setting is using ID 3230 which
supports 4.35 volt batteries. In order to support 4.2-4.3 volt batteries, select Chemistry #1 (1202). 4.4 volt
batteries, select Chemistry #2 (3142).
Figure 8. Chemistry Screen
8
Related Documentation from Texas Instruments
To obtain a copy of any of the following TI documents, call the Texas Instruments Literature Response
Center at (800) 477-8924 or the Product Information Center (PIC) at (972) 644-5580. When ordering,
identify this document by its title and literature number. Updated documents also can be obtained through
the TI Web site at www.ti.com .
1. bq27426 System-Side Impedance Track™ Fuel Gauge with Integrated Sense Resistor data sheet
(SLUSC91)
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