User's Guide
SLUU287A – September 2007 – Revised October 2013
bq2750xEVM System Side Single-Cell Impedance Track™
Technology Evaluation Module
This evaluation module (EVM) is a complete evaluation system for the bq2750x. The EVM includes one
bq2750x circuit module, a current sense resistor, one thermistor, and Windows®-based PC software. An
EV2300 board for gas gauge interface is required to interface this EVM with the PC and can be purchased
separately. The circuit module includes one bq27500 or bq27501 integrated circuit (IC), one TPS71525 IC,
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 interface board
and software, the user can read the bq2750x data registers, program the chipset for different pack
configurations, log cycling data for further evaluation, and evaluate the overall functionality of the bq2750x
solution under different charge and discharge conditions.
1
2
3
4
5
6
7
8
9
10
11
12
Contents
Features ...................................................................................................................... 2
bq2750x-Based Circuit Module ........................................................................................... 2
bq2750x Circuit Module Schematic ....................................................................................... 3
Circuit Module Physical Layouts and Bill of Materials .................................................................. 3
EVM Hardware and Software Setup ..................................................................................... 8
Troubleshooting Unexpected Dialog Boxes ............................................................................. 8
Hardware Connection ...................................................................................................... 8
Operation ................................................................................................................... 10
Calibrate Screen ........................................................................................................... 12
I2C Pro Screen ............................................................................................................ 14
bqEasy ...................................................................................................................... 14
Related Documentation from Texas Instruments ..................................................................... 19
List of Figures
1
bq27500EVM-001 Layout (Silk Screen)
.................................................................................
3
2
Top Assembly ...............................................................................................................
4
3
Top Layer ....................................................................................................................
4
4
Bottom Layer
5
6
7
8
9
10
11
12
13
................................................................................................................
Schematic ....................................................................................................................
bq27500 Circuit Module Connection to Cell and System Load/Charger ............................................
DataRAM Screen ..........................................................................................................
Data Flash Screen ........................................................................................................
Calibration Screen .........................................................................................................
I2C Pro Screen ............................................................................................................
bqEasy Welcome Screen.................................................................................................
bqEasy Flowchart .........................................................................................................
Load and Switch ...........................................................................................................
5
7
9
10
11
13
14
15
16
19
List of Tables
1
Ordering Information ........................................................................................................
2
2
Bill of Materials ..............................................................................................................
6
Impedance Track is a trademark of Texas Instruments.
Windows, Microsoft are registered trademarks of Microsoft Corporation.
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1
Features
1
3
Performance Specification Summary.....................................................................................
8
4
Circuit Module to EV2300 Connections ..................................................................................
9
Features
•
•
•
•
1.1
Complete evaluation system for the bq2750x gas gauge with Impedance Track™ Technology
Populated circuit module for quick setup
PC software and interface board for easy evaluation
Software that allows data logging for system analysis
Kit Contents
•
•
•
•
1.2
www.ti.com
bq2750x/TPS71525 circuit module (HPA291)
Software CD with the evaluation software
NTC103AT Thermistor
Set of support documentation
Ordering Information
Table 1. Ordering Information
2
EVM PART NUMBER
CHEMISTRY
CONFIGURATION
CAPACITY
bq27500EVM
Li-ion
1 cell
Any
bq27501EVM
Li-ion
1 cell
Any
bq2750x-Based Circuit Module
The bq2750x-based circuit module is a complete and compact example solution of a bq2750x circuit for
battery management. The circuit module incorporates a bq2750x battery gas gauge IC, a TPS71525 LDO
regulator, and all other components necessary to accurately predict the capacity of 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 (J8 or J9): PACK+, PACK-, T and RID (bq27501 only)
• To the serial communications port (J4): 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): BAT_LOW and /BAT_GD
• Optional 2.5V input if powering IC from actual system power (J3): 2.5V INPUT and VSS
2
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bq2750x Circuit Module Schematic
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2.2
Pin Descriptions
PIN NAME
PACK+
PACKT
NC/RID
SDA
SCL
VSS
CHARGER+/LOAD+
CHARGER-/LOADBAT_LOW
/BAT_GD
3
bq2750x Circuit Module Schematic
3.1
Schematic
DESCRIPTION
Pack positive terminal
Pack negative terminal
Pack thermistor input
Pack resistor ID input (bq27501 only)
I2C communication data line
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)
Access to push-pull output that signals low State-of-charge
Access to open drain output that indicates that pack is ready to
be connected to system
The schematic follows the bill of materials in this user's guide.
4
Circuit Module Physical Layouts and Bill of Materials
This section contains the board layout, bill of materials, and assembly drawings for the bq2750x circuit
module.
4.1
Board Layout
This section shows the PCB layers (Figure 1 through Figure 4), and assembly drawing for the bq2750x
module.
Figure 1. bq27500EVM-001 Layout (Silk Screen)
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Circuit Module Physical Layouts and Bill of Materials
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Figure 2. Top Assembly
Figure 3. Top Layer
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Figure 4. Bottom Layer
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Circuit Module Physical Layouts and Bill of Materials
4.2
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Bill of Materials and Schematic
Table 2. Bill of Materials
6
'500
'501
Count
Count
Ref Des
Description
Size
MFG
Part No.
7
7
C1, C3, C4, C5, C7,
C8, C9
Capacitor, Ceramic, 0.1uF, 10V, X5R
402
Murata
GRM155R61A104KA01D
1
1
C2
Capacitor, Ceramic, 0.033uF, 10V, X7R, +/10%
402
Murata
GRM155R71A333KA01D
1
1
C6
Capacitor, Ceramic, 0.47uF, 6.3V, X5R
402
Murata
GRM155R60J474KE19D
1
1
D1
Diode, Dual, Zener, 5.6V, 300mW
SOT23
Diodes
AZ23C5V6
4
4
J2, J3, J6, J7
Terminal Block, 2-pin, 6-A, 3.5mm
0.27 x 0.25 inch
OST
ED555/2DS
0
1
J1
Terminal Block, 2-pin, 6-A, 3.5mm
0.27 x 0.25 inch
OST
ED555/2DS
2
2
J4, J9
Header, Friction Lock Assy, 4-pin Right
Angle
0.400 x 0.500
Molex
22-05-3041
1
1
J5
Header, Male 3-pin, 100mil spacing, (36-pin
strip)
0.100 inch x 3
Sullins
PTC36SAAN
1
1
J8
Terminal Block, 4-pin, 6-A, 3.5mm
0.55 x 0.25 inch
OST
ED555/4DS
2
2
R1, R2
Resistor, Chip, 10k-Ohms, 1/16-W, 5%
402
Std
Std
0
1
R12
Resistor, Chip, 300-Ohms, 1/16-W, 5%
402
Std
Std
1
1
R13
Resistor, Chip, 0.01-Ohms, 0.25W, 1%
1206
Vishay
WSL1206R0100FEA
6
6
R3, R4, R8, R9,
R10, R11
Resistor, Chip, 100-Ohms, 1/16-W, 5%
402
STD
STD
1
1
R5
Resistor, Chip, 1.80-MOhms, 1/16-W, 5%
402
Std
Std
1
1
R6
Resistor, Chip, 18.2-kOhms, 1/16-W, 5%
402
Std
Std
1
1
R7
Resistor, Chip, 1-kOhms, 1/16-W, 5%
402
Std
Std
1
0
U1
IC, Host-Side Impedance-Track Fuel Gauge
QFN12
TI
BQ27500DRZ
0
1
U1
IC, Host-Side Impedance-Track Fuel Gauge
QFN12
TI
BQ27501DRZ
1
1
U2
IC, High Input Voltage, Micropower, 3.2 μA
@ 50 mA LDO, 2.5V
SOP-5 (DCK)
TI
TPS71525DCKR
1
1
VCC1
Test Point, Black, Thru Hole Color Keyed
0.100 x 0.100
inch
Keystone
5001
1
1
RT1 (component not
part of layout. It is
added to board at
PCB test)
Thermistor, 10k Ohms
0.095 x 0.150
inches
Semitec
NTC103AT
bq2750xEVM System Side Single-Cell Impedance Track™ Technology
Evaluation Module
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Figure 5. Schematic
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EVM Hardware and Software Setup
4.3
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bq2750x Circuit Module Performance Specification Summary
This section summarizes the performance specifications of the bq27500 circuit module.
Table 3. Performance Specification Summary
Specification
Min
Typ
Max
Units
Input voltage Pack+ to Pack–
2.7
3.6
4.3
V
Input voltage BAT+ to BAT–
2.7
3.6
4.3
V
0
1
2
A
Charge and discharge current
5
EVM Hardware and Software Setup
This section describes how to install the bq27500EVM-001 PC software and how to connect the different
components of the EVM.
5.1
System Requirements
The bq27500EVSW software requires Windows 2000 or Windows XP. Drivers for Windows 98SE are
provided, but Microsoft® no longer supports Windows 98; there may be issues in Windows 98 with 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.
5.2
Software Installation
Find the latest software version in the bq27500 or bq27501 tool folder on power.ti.com. Use the following
steps to install the bq27500EVSW software:
1. Ensure that EV2300 is not connected to PC through USB cable before staring this procedure.
2. Browse the included CD and go to the Software directory, and open the bqEVEASYSetup00.09.38_bq27500v1.00_bqEasy1.00.exe file or obtain the latest version from the TI Web
site.
3. Follow the instructions on screen until completing the software installation.
4. Before starting the evaluation software, connect the EV2300 to the computer using the USB cable.
5. Wait until system prompt “new hardware found” appears. Choose “select location manually”, and use
the “browse” button to point to subdirectory TIUSBWin2K-XP-1.
6. Answer “continue” to the warning that drivers are not certified with Microsoft.
7. After installation finishes, another system prompt "new hardware found" appears. Repeat steps 1
through 5, but specify the directory as TIUSBWin2K-XP-2.
8. Answer "continue" to the warning that drivers are not certified with Microsoft. Driver installation is now
finished.
If files were downloaded from the TI Web site:
1. Open the archive containing the installation package, and copy its contents into a temporary directory.
2. Follow the preceding steps 1–8.
6
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 policy.
7
Hardware Connection
The bq27500EVM-001 comprises three hardware components: the bq2750x/TPS71525 circuit module, the
EV2300 PC interface board (purchased separately), and the PC.
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7.1
Connecting the bq27500 Circuit Module to a Battery Pack
Figure 6 shows how to connect the bq27500 circuit module to the cells and system load/charger.
Figure 6. bq27500 Circuit Module Connection to Cell and System Load/Charger
7.2
PC Interface Connection
The following steps configure the hardware for interface to the PC:
1. Connect the bq2750x-based EVM to the EV2300 using wire leads as shown in Table 4.
Table 4. Circuit Module to EV2300 Connections
bq2750x-Based Battery
EV2300
SDA
SDA
SCL
SCL
VSS
GND
2. Connect the PC USB cable to the EV2300 and the PC USB port.
The bq27500EVM-001 is now set up for operation.
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Operation
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Operation
This section details the operation of the bq27500 EVSW software.
8.1
Starting the Program
Run bq27500 EVSW from the Start | Programs | Texas Instruments | bq Evaluation Software menu
sequence. The DataRAM screen (Figure 7) appears. Data begins to appear once the (single
time scan) button is clicked, or when the check box is checked. To disable the scan
feature, deselect .
The continuous scanning period can be set via the | Options | and | Set Scan Interval | menu selections.
The range for this interval is 0 ms to 65,535 ms. Only items that are selected for scanning are scanned
within this period.
The bq27500 EVSW provides a logging function which logs the values that were last scanned by EVSW.
To enable this function, select the Start Logging button; this causes the Keep Scanning button to be
selected. When logging is Stopped, the keep scanning button is still selected and has to be manually
unchecked.
The logging intervals are specified under the | Options | menu with the maximum value of 65,535 ms. The
Log interval cannot be smaller than the scan interval because this results in the same value being logged
at least twice.
Figure 7. DataRAM Screen
This screen (Figure 7) shows the RAM data set Additional Flag and Status data can be viewed at the
bottom of the DataRAM screen.
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Dragging the splitter bar (line that separates the Flags/Static data from SBS values) changes the height of
the Flags/Static Data display. Selecting | View |, then | Auto Arrange | returns the splitter bar to its original
location.
8.2
Setting Programmable bq27500 Options
The bq2750x data flash comes configured per the default settings detailed in the bq27500 data sheet.
Ensure that the settings are correctly changed to match the pack and application for the bq2750x 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 Flash screen (Figure 8).
Figure 8. Data Flash Screen
To read all the data from the bq2750x data flash, click on menu option | Data Flash | Read All |.
To write to a data flash location, click on the desired location, enter the data and press , which
writes the entire tab of flash data, or select menu option | Data Flash | Write All |. The data flash must be
read before any writes are performed to avoid any incorrect data being written to the device.
The | File | Special Export | menu options allows the data flash to be exported, but it configures the
exported data flash to a learned state ready for mass production use.
The data flash configuration can be saved to a file by selecting | File | Export | and entering a file name. A
data flash file also can be retrieved in this way, imported, and written to the bq2750x using the | Write All |
button.
The module calibration data is also held in the bq2750x data flash.
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Calibrate Screen
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The bq2750x allows for an automatic data flash export function, similar to the DataRAM logging function.
This feature, when selected via | Options | Auto Export |, exports Data Flash to a sequential series of files
named as FilenameNNNNN.gg where N = a decimal number from 0 to 9.
The AutoExport interval is set under the | Options menu | with a minimum value of 15 s. The AutoExport
filename is also set under the | Options menu |.
When a check is next to | AutoExport |, the AutoExport is in progress. The same menu selection is used to
turn on / off AutoExport.
If the data flash screen is blank, then the bq2750x that is being used may not be supported by the
bqEVSW version that is being used. An upgrade may be required.
9
Calibrate Screen
To ensure proper calibration follow the order described below. These steps may or may not be required,
depending on the type of calibration being performed.
9.1
To Calibrate the bq2750x
Select the types of calibration to be performed (see Figure 9).
Enter the measured values for the types selected.
If Temperature Calibration is selected, then select the sensor that is to be calibrated.
Press the Calibrate Part as indicated below button.
9.2
CC Offset Calibration
This performs the internal calibration of the coulomb counter input offset.
9.3
Board Offset Calibration
This performs the offset calibration for the current offset of the board.
It is expected that no current is flowing through the sense resistor while performing this calibration step.
Remove load and short PACK– to LOAD–.
Press the CC Board Offset Calibration button.
9.4
Temperature Calibration
•
•
•
•
9.5
Pack Current Calibration
•
•
•
12
Measure the temperature for PACK.
Type the temperature value into Enter Actual Temperature.
Select if the temperature sensor to calibrate is the internal or external.
Press the Calibrate Part as indicated below button.
Connect a load to LOAD– and LOAD+ that draws approximately 1 A, or connect a current source to
LOAD– and Pack-.
Measure the current and type value into Enter Actual Current using (-) for current in discharge
direction.
Press the Calibrate Part as indicated below button.
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Calibrate Screen
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Figure 9. Calibration Screen
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I2C Pro Screen
10
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I2C Pro Screen
10.1 I2C Communication
The read/write operations of the I2C Pro function is not specific to any gas gauge. These operations serve
as general-purpose communication tools (Figure 10).
Figure 10. I2C Pro Screen
11
bqEasy
11.1 Introduction
Texas Instruments fuel gauges, employing the Impedance Track™ algorithm offer an unmatched array of
features and benefits. Sometimes, however, the wide range of configuration settings can make it seem a
bit challenging to get started with the evaluation process. In addition, determining the correct chemistry
model and producing the 'golden image' file can be time consuming. The bqEASY program is designed to
greatly simplify the process of configuring, calibrating, selecting chemistry and performing learning cycles
through the step-by-step use of a wizard program.
The bqEasy software will run inside the current EV software when it is executed by clicking the bqEasy
button in the left-hand column of buttons below the Calibrate button in the EV software.
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Figure 11. bqEasy Welcome Screen
11.2 Program Navigation and Flowchart
The sequence of operation of bqEASY can be understood by reviewing the basic flowchart in Figure 12 .
Using the program is simple – just start a new project and follow the steps sequentially from 1A to 5C.
You can use the Next button, or click on the top tabs and left subsection labels to move to any desired
page. Some operations must be completed in sequence due to data dependencies, or to implement the
proper flow. Therefore it is recommended that the prescribed sequence be followed, at least at first.
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bqEasy
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(1A) Open Project
(4B) Display available chemistry files
(1B) Write default .DFI file to
gauge (or keep existing image)
(4A) Is the cell
chemistry
identifiable
from the list?
(2A~2H) Configure gauge from
wizard questions
No
(4C) Do chemistry selection cycle
to log elapsed time, voltage,
temperature and current
(3A~3F) Calibrate gauge
Yes
(3F) Read/save configured flash
from gauge to .DFI binary file
(4A) Are the
cell based on
standard Li-Ion
chemistry?
(4C) Write previously saved
configured .DFI file to gauge
(4C) Programmatically select best
chemistry match
No
(4C) Write selected chemistry
model to gauge
Yes
(4C) Read/save configured flash
from gauge to .DFI binary file
(5A) Enable Impedance Track
algorithm
(5A~5B) Perform learning cycles
(5C) Write previously saved .DFI
binary file to the gauge to insure
no cycling corruption
(5C) Write Ra Table, Qmax, Cycle
Count and Update Status to gauge
(5C) Reset Gauge
(5C) Read flash, save golden .DFI
file
Figure 12. bqEasy Flowchart
11.3 Simplified Configuration Procedures
These simplified configuration procedures can be used to quickly set up the parameters without navigating
through the entire user interface.
1. Simple configuration of the Gas Gauge with default or custom data:
(a) Open the current EV software and click the bqEasy button in the left-hand column of buttons below
the "Calibrate" button in the EV software.
(b) Click the "2. Configure" tab at the top row of bqEASY tabs. (Note: You can skip the 1st tab)
(c) Answer all questions or leave defaults for all of tab "2", but be sure to click the ok button at the
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bottom of each tab "2" page to ensure that a Completion Checkmark appears for each page.
(d) On page 2H, when you click the "OK" button, the software will ask you to write to the data flash
memory. Click "Yes" for OK to write to the data flash.
Your Gas Gauge Module now has the data flash configured as you declared with all the information
entered in tab "2. Configure".
2. Simple installation of the Chemistry data using bqEASY if the chemistry is a known chemistry available
in the bqEASY software:
(a) Open the current EV software and click the bqEasy button in the left-hand column of buttons below
the "Calibrate" button in the EV software.
(b) Click the "4. Chemistry" tab at the top row of bqEASY tabs. (Note: You can skip all tabs prior to
this)
(c) Either select "Use Default Chemistry", or click "Enable Chemistry Selection" and select the correct
chemistry from the list.
(d) If you cannot find the proper chemistry, check the device EVM tool folder on the TI Web site for any
new bqChemistry file updates. These are updated more frequently than the EV software, so
between EV software updates, we will create a self-extracting installer and post it in the EVM tool
folder for the part being used. Install these updates if they are in the folder.
The software will now configure all data flash locations on Your Gas Gauge Module that deal with
chemistry functions. No other data flash locations will be modified.
11.4 Files
bqEASY uses four types of files to configure a fuel gauge.
1. .ENCR – These are default data-flash definition files found in the \bq_Evaluation_Software folder. The
ENCR file is basically a copy of the entire data-flash from a fresh Gas Gauge prior to any data-flash
updates either by the user or the Gas Gauge. They are unique for each version of each TI fuel gauge
product. If you should be working with a new version fuel gauge and an older version of bqEASY, the
correct file may not be present. This will require a new version of the EV software with bqEASY.
Navigate to the TI Web site in the EVM tool folder for the device being used, and download the latest
version, or contact TI. For bqEASY, the ENCR files act mainly as a dictionary to look up the address
for a given data-flash location. For bqEVSW, they define screen parameters including address, display
formulas and data type. An error message will appear if the correct .ENCR file cannot be found.
2. .CHEM (Chemistry Files) – These are read-only files found in
the ..\bq_Evaluation_Software\Plugins\Chemistry folder of the application. When a new Li-Ion battery
chemistry is developed, a new Impedance Track model is required to define the chemical model.
During automated chemistry selection, each of these files is scanned in order to select the best match
with the recorded data. If you are working with a newly developed chemistry, it is possible that an
acceptable match will not be found. If this is the case, please check for updated bqEasy software or
bqChemistry files on the TI Web site in the EVM tool folder for the part being used.
3. .DFI (Data-Flash Image Files) – These are binary images of the fuel gauge data-flash with modified
values based on the application. Because of the binary format, it is quick and easy to transfer them to
and from a gauge. Each fuel gauge model and firmware version has a unique read-only .DFI which is
found in the ..\bq_Evaluation_Software\Plugins\Device_Defaults folder of the application. During the
bqEASY process, intermediate versions of .DFI files are recorded with current updated data in order to
prevent the possibility of corruption. Then, the final output of bqEASY is also a .DFI file which is the
'golden image' that will be programmed into each production unit. This output file will be placed in
the ..\bq_Evaluation _Software\Plugins\Projects folder.
4. .EZY (bqEASY Project Files)– These are read-write text files which record header information
regarding a project, answers to the wizard questions, and status regarding the stage of completion (the
red check marks). They are kept in the ..\bq_Evaluation _Software\Plugins\Projects folder.
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bqEasy
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11.5 Completion Checkmarks
As the wizard questions and tasks are completed, completion checkmarks appear in two places – along
the task list on the left and on the category tabs on top. A checkmark on a top tab will only appear after all
tasks in the category have been completed. For example, in Figure 3 all of the Setup tasks and all of the
Configure tasks have been completed. Completion marks are saved in the .EZY project text file. When a
completed or partially-completed project file is opened, the user is given the chance to erase the
checkmarks.
11.6 Device Detection
BqEASY is designed to work with a fuel gauge present and already communicating with the bqEVSW
evaluation software through the EV2300 USB interface. When the Evaluation software is started, it reads
the device type and displays it on the upper title block. This information is used by bqEASY to select the
correct default data-flash image (.DFI) and data-flash configuration file (.ENCR) for this particular device.
To ensure that the device has not changed, bqEASY also checks the device type when the bqEASY
button is pressed. If the correct files are not found, first check the TI Web site in the EVM tool folder for
the part being used, and download the latest version of EV software with bqEASY support. If that does not
help, then contact TI.
1. Setup
As the wizard questions and tasks are completed, completion checkmarks appear in two places –
along the task list on the left and on the category tabs on top. A checkmark on a top tab will only
appear after all tasks in the category have been completed. Completion marks are saved in the .EZY
project text file. When a completed or partially-completed project file is opened, the user is given the
chance to erase the checkmarks.
2. Configure
A series of eight screens is used to collect information about the battery pack application to enable
automatic configuration of the most critical data-flash parameters.
3. Calibrate
If you wish to proceed with either automatic chemistry selection or 'golden' unit learning cycles, the
Impedance Track fuel gauge must be accurately calibrated. The bqEASY screens simply ask the user
to use the calibration screen of the bqEVSW for this purpose.
4. Chemistry
The chemistry choices presented in section 4B are based on files in the \Chemistry folder of the
bqEASY application. The latest files are available for downloading from the ti.com Web site.
Automation of the chemistry-selection cycle is made possible using a simple load and switch as
depicted in Figure 13. The switch can be implemented with either a low VGS-threshold FET or a small
relay such as the OMICRON G6RN-1 with a 5-VDC coil. Multiple 2N7000 FETs can be paralleled if
nothing else is available. The load can be either a power resistor or an electronic load set to a
discharge rate of C/5. Hint: Follow the instructions exactly, or errors may result.
5. Cycle
When preparing for mass production, cell learning is required, but only on one 'golden' pack. The
chemical information learned from one pack will be quickly transferred to all production units prior to
calibration. Doing this correctly requires a series of charge and discharge cycles. The discharge part
can be automated with bqEASY if the simple load circuit for the chemistry selection is available. Follow
the screen instructions.
18
bq2750xEVM System Side Single-Cell Impedance Track™ Technology
Evaluation Module
SLUU287A – September 2007 – Revised October 2013
Submit Documentation Feedback
Copyright © 2007–2013, Texas Instruments Incorporated
Related Documentation from Texas Instruments
www.ti.com
Electronic Load or
Resistor ~ C/5
EVM
LOAD+
EV2300 HDQ Connector
VOUT
GND
LOADFigure 13. Load and Switch
12
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 can also be obtained through
the TI Web site at www.ti.com.
SLUU287A – September 2007 – Revised October 2013
Submit Documentation Feedback
bq2750xEVM System Side Single-Cell Impedance Track™ Technology
Evaluation Module
Copyright © 2007–2013, Texas Instruments Incorporated
19
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