User's Guide
SLUU234A – February 2006 – Revised October 2013
bq20z90EVM-001 SBS 1.1 Impedance Track™ Technology
Enabled Battery Management Solution Evaluation Module
This evaluation module (EVM) is a complete evaluation system for the bq20z90/bq29330/ bq29412 battery
management system. The EVM includes one bq20z90/bq29330/bq29412 circuit module, a current sense
resistor, two thermistors, 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 bq20z90 integrated circuit (IC), one bq29330 IC, one bq29412 IC, and all other onboard components
necessary to monitor and predict capacity, perform cell balancing, monitor critical parameters, protect the
cells from overcharge, over discharge, short circuit, and overcurrent in 2-, 3- or 4-series cell Li-ion or Lipolymer battery packs. The circuit module connects directly across the cells in a battery. With the EV2300
interface board and software, the user can read the bq20z90 data registers, program the chipset for
different pack configurations, log cycling data for further evaluation, and evaluate the overall functionality
of the bq20z90/ bq29330/bq29412 solution under different charge and discharge conditions.
1
2
3
4
5
6
7
8
9
10
Contents
Features ...................................................................................................................... 2
bq20z90/bq29330-Based Circuit Module ................................................................................ 2
bq20z90/bq29330 Circuit Module Schematic ........................................................................... 3
Circuit Module Physical Layouts and Bill of Materials .................................................................. 4
EVM Hardware and Software Setup ..................................................................................... 8
Troubleshooting Unexpected Dialog Boxes ............................................................................. 8
Hardware Connection ...................................................................................................... 9
Operation ................................................................................................................... 10
Calibration Screen ......................................................................................................... 13
Pro (Advanced) Screen ................................................................................................... 15
List of Figures
1
bq20z90EVM-001 Layout (Silk Screen) ..................................................................................
4
2
Top Assembly ...............................................................................................................
4
3
Top Layer ....................................................................................................................
5
4
Bottom Layer
................................................................................................................
...........................................................................................................
Schematic ....................................................................................................................
bq20z90bq29330 Circuit Module Connection to Cells and System Load/Charger .................................
SBS Data Screen ..........................................................................................................
Data Flash Screen, 1st Level Safety Class ............................................................................
Calibration Screen .........................................................................................................
Pro (Advanced) Screen ...................................................................................................
5
5
Bottom Assembly
6
7
8
9
10
11
5
7
9
10
11
14
15
List of Tables
1
Ordering Information ........................................................................................................
2
2
Components and Flash-Memory Settings for Different Precharge Modes ..........................................
4
3
Bill of Materials ..............................................................................................................
6
4
Performance Specification Summary.....................................................................................
8
Impedance Track is a trademark of Texas Instruments.
Windows is a registered trademark of Microsoft Corporation.
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Features
5
1
•
•
•
9
Complete evaluation system for the bq20z90 SBS 1.1-compliant advanced gas gauge with Impedance
Track™ Technology, bq29330 analog front end (AFE) and protection IC, and bq29412 independent
overvoltage protection IC
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
Circuit Module to EV2300 Connections ..................................................................................
Features
•
1.1
www.ti.com
bq20z90/bq29330/bq29412 circuit module
Software CD with the evaluation software
Set of support documentation
Ordering Information
Table 1. Ordering Information
2
EVM PART NUMBER
CHEMISTRY
CONFIGURATION
CAPACITY
bq20z90EVM-001
Li-ion
2, 3, or 4 cell
Any
bq20z90/bq29330-Based Circuit Module
The bq20z90/bq29330/bq29412-based circuit module is a complete and compact example solution of a
bq20z90 and bq29330 circuit for battery management and protection of Li-ion or Li-polymer packs. The
circuit module incorporates a bq20z90 battery monitor IC, bq29330 AFE and protection IC, bq29412
independent overvoltage protection IC, and all other components necessary to accurately predict the
capacity of 2-, 3-, or 4-series cells.
2.1
Circuit Module Connections
Contacts on the circuit module provide the following connections:
• Direct connection to the cells: 1N (BAT-), 1P, 2P, 3P, 4P (BAT+)
• To the serial communications port (SMBC, SMBD)
• The system load and charger connect across PACK+ and PACK• To the system-present pin (SYS PRES)
2
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bq20z90/bq29330 Circuit Module Schematic
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2.2
Pin Descriptions
PIN NAME
1N
1P
2P
3P
4P
SMBC
SMBD
SYS PRES
PACKVSS
PACK+
3
DESCRIPTION
-ve connection of first (bottom) cell
+ve connection of first (bottom) cell
+ve connection of second cell
+ve connection of third cell
+ve connection of fourth (top) cell
Serial communication port clock
Serial communication data port
System present pin (if low, system is present)
Pack negative terminal
Pack negative terminal
Pack positive terminal
bq20z90/bq29330 Circuit Module Schematic
This section contains information for modifying and choosing a precharge mode for
bq20z90/bq29330/bq29412 implementation.
3.1
Schematic
The schematic follows the bill of materials in this user's guide.
3.2
Modifications for Choosing Particular Precharge Mode
In order to charge, the charge FET (CHG-FET) must be turned on to create a current path. When the
V(BAT) is 0 V and CHG-FET = ON, the V(PACK) is as low as the battery voltage. In this case, the supply
voltage for the device is too low to operate. This function has three possible configurations, and the
bq29330 can be easily configured according to the application needs. The three modes are 0-V Charge
FET mode, Common FET mode, and Precharge FET mode.
1. 0-V Charge FET mode - Dedicates a precharge current path using an additional FET (ZVCHG-FET) to
sustain the PACK+ voltage level.
2. Common FET mode - Does not use a dedicated precharge FET. The charge FET (CHG-FET) is set to
ON state as default.
3. Precharge FET mode - Dedicates a precharge current path using an additional open-drain (OD) pin
drive FET (PCHG-FET) to sustain the PACK+ voltage level.
To use a particular mode of charging with the EVM, add or remove some elements shown in Table 2, and
use the given settings of DF.Configuration, ZVCHG1, 0.
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Circuit Module Physical Layouts and Bill of Materials
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Table 2. Components and Flash-Memory Settings for Different Precharge Modes
MODE
RESISTORS
PRECHG FET
ZVCHG1
ZVCHG0
1 0-V Chg
(default)
R18, R23
Q3
0
0
2 Common FET
R20
Q2
0
1
3 Precharge
R19, R23
Q3
1
0
For more details about precharge operation and mode choices, see the bq29330 data sheet at
(SLUS673).
3.3
Testing Fuse-Blowing Circuit
To prevent the loss of board functionality during the fuse-blowing test, the actual chemical fuse is not
provided in the circuit. FET Q4 drives TP4 low if a fuse-blow condition occurs; so, monitoring TP4 can be
used to test this condition. Fuse placement on the application board is shown in the bq20z90 data sheet
reference-board schematic.
4
Circuit Module Physical Layouts and Bill of Materials
This section contains the board layout, bill of materials, and assembly drawings for the bq20z90/ bq29330/
bq29412 circuit module.
4.1
Board Layout
This section shows the dimensions, PCB layers (Figure 1 through Figure 5), and assembly drawing for the
bq20z90/bq29330 module.
Figure 1. bq20z90EVM-001 Layout (Silk Screen)
Figure 2. Top Assembly
4
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Figure 3. Top Layer
Figure 4. Bottom Layer
Figure 5. Bottom Assembly
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Circuit Module Physical Layouts and Bill of Materials
4.2
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Bill of Materials and Schematic
Table 3. Bill of Materials
Count
6
Ref Des
Description
Size
MFG
Part No.
20
C1, C2, C3, C4,
C6, C7, C8, C9,
C10, C11, C13,
C16, C18, C19,
C20, C21, C22,
C23, C26, C27
Capacitor, ceramic, 0.1 μF 50 V, X7R, 20%
0603
Any
STD
1
C14
Capacitor, ceramic, 0.22 μF, 50 V, X7R, 20%
0603
Any
STD
1
C15
Capacitor, ceramic, 4.7 μF, 25 V, X7R, 10%
1206
Any
STD
2
C24, C28
Capacitor, ceramic, 0.47 μF, 16 V, X7R, 20%
0603
Any
STD
1
C25
Capacitor, ceramic, 4.7 μF, 10 V, X7R, 20%
0603
Any
STD
2
C5, C17
Capacitor, ceramic, 1.0 μF, 50 V, X7R, 20%
0805
Any
STD
3
D1, D2, D3
Diode, switching, 150-mA, 75-V, 350 mW
SOT23
Vishay-Liteon
BAS16
2
D4, D10
Diode, dual, Zener, 5.6 V, 300 mW
SOT23
Vishay-Telefunken
AZ23C5V6
5
D5, D6, D7, D8,
D9
Diode, LED, green, Gullwing, GW type, 20
mA, 7.5 mcd Typ
0.120 × 0.087
Panasonic
LN1361C
1
J1
Header, friction lock assembly, 4-pin right
angle
0.400 × 0.500
Molex
22-05-3041
1
Q1
MOSFET, P-ch, 20 V, 1.3 A, 0.16 Ω
SOT23
Fairchild
NDS331N
2
Q2, Q4
MOSFET, N-ch, 30 V, 10 A, Rds 16 mΩ
SO8
Fairchild
FDS6690S
1
Q3
MOSFET, P-ch, 30 V, 8.0-A, 20-mΩ
SO8
Siliconix
Si4435DY
1
Q5
MOSFET, Nch, 50 V, 0.22 A, 6 Ω
SOT23
Fairchild
BSS138
12
R1, R2, R3, R4,
R5, R25, R26,
R28, R32, R33,
R37, R38
Resistor, chip, 100 Ω, 1/16 W, 5%
0603
STD
STD
2
R13, R24
Resistor, chip, 3.01 mΩ, 1/16 W, 5%
0603
STD
STD
1
R14
Resistor, chip, 300-Ω, 1-W, 10%
2512
3
R15, R18, R22
Resistor, chip, 5.1 kΩ, 1/16 W, 5%
0603
STD
STD
0
R19
Resistor, chip, 5.1 kΩ, 1/16 W, 5%
0603
STD
STD
3
R17, R35, R36
Resistor, chip, 1 mΩ, 1/16 W, 5%
0603
STD
STD
1
R23
Resistor, chip, 100 kΩ, 1/16 W, 5%
0603
STD
STD
0
R20
Resistor, chip, 100 kΩ, 1/16 W, 5%
0603
STD
STD
1
R21
Resistor, chip, 0.010Ω, 1-W, xx%
2512
Vishay
WSL-2512-020
1
R29
Resistor, chip, 1 kΩ, 1/16 W, 5%
0603
STD
STD
2
R30, R40
Resistor, chip, 8.45 kΩ, 1/16 W, 1%
0603
STD
STD
2
R31, R39
Resistor, chip, 61.9 kΩ, 1/16 W, 1%
0603
STD
STD
4
R6, R11, R12,
R34
Resistor, chip, 220 kΩ, 1.16 W, 5%
0603
STD
STD
6
R7, R8, R9, R10,
R16, R27
Resistor, chip, 1 kΩ, 1.16 W, 5%
0603
STD
STD
2
RT1, RT2
Thermistor, 10 kΩ
0.095 × 0.150
Sematec
NTC103AT
1
SW1
Switch, push button, momentary, N.O. low
profile
5 mm × 5 mm
Panasonic
EVQPLCxxxx
2
TB1, TB4
Terminal block, 3 pin, 6 A, 3,5 mm
0.41 × 0.25
OST
ED1515
2
TB2, TB3
Terminal block, 2 pin, 6 A, 3,5 mm
0.27 × 0.25
OST
ED1514
1
TP1
Test point, black, thru hole color keyed
0.100 × 0.100
Keystone
5001
1
TP2
Test point, red, thru hole color keyed
0.100 × 0.100
Keystone
5000
1
TP2
Test point, white, thru hole color keyed
0.100 × 0.100
Keystone
5002
1
U1
IC, voltage protection for 2, 3, or 4 cell Li-Ion,
2nd protection, 4.45 V, OVP
SSOP-08
TI
bq29412DCT
1
U2
IC, 2-3, or 4 cell series protection control AFE
TSSOP30
TI
bq29330DBT
1
U3
IC, impedance track advanced gas gauge
TSSOP30
TI
bq20z90DBT
bq20z90EVM-001 SBS 1.1 Impedance Track™ Technology Enabled Battery
Management Solution Evaluation Module
WSL=2512-xx
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Figure 6. Schematic
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EVM Hardware and Software Setup
4.3
www.ti.com
bq20z90/bq29330/bq29412 Circuit Module Performance Specification Summary
This section summarizes the performance specifications of the bq20z90/ bq29330/bq29412 circuit module.
Table 4. Performance Specification Summary
Specification
5
Min
Typ
Max
Units
Input voltage Pack+ to Pack–
6
15
25
V
Charge and discharge current
0
2
7
A
EVM Hardware and Software Setup
This section describes how to install the bq20z90EVM-001 PC software, and how to connect the different
components of the EVM.
5.1
System Requirements
The bq20z90EVSW software requires Windows 2000 or Windows XP. Drivers for Windows 98SE are
provided, but Microsoft no longer supports Windows 98; and 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 bq20z90 tool folder on power.ti.com. Use the following steps to
install the bq20z90EVSW software:
1. Copy the files from the CD into the temporary directory you selected, open the archive TI USB
DRVRS.zip, and extract its contents in a subdirectory/drivers. Choose preserve directory structure
option when extracting. Alternatively, run SETUP.EXE from the same directory.
2. Plug the EV2300 into a USB port.
3. Wait until system prompt new hardware found appears. Choose select location manually, and use the
browse button to point to subdirectory TIUSBWin2K-XP-1.
4. Answer continue to the warning that drivers are not certified with Microsoft.
5. After installation finishes, another system prompt new hardware found appears. Repeat procedure
above, but point to subdirectory TIUSBWin2K-XP-2
6. Answer continue to the warning that drivers are not certified with Microsoft. Installation of drivers is
now finished.
7. For Windows 98, point to directory TIUSBWin98.
8. Return to the temporary directory where you extracted files; double-click on the Setup.exe icon to
install EV Software.
If files were downloaded from the Web:
1. Open the archive containing the installation package, and copy its contents in a temporary directory.
2. Follow the preceding steps 1 - 8.
6
Troubleshooting Unexpected Dialog Boxes
Ensure that the files were extracted from the zip file using the Preserve Folder names option.
Ensure that all the files were extracted from the zip file.
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.
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Hardware Connection
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7
Hardware Connection
The bq20z90EVM-001 comprises three hardware components: the bq20z90/bq29330/bq29412 circuit
module, the EV2300 PC interface board (purchased separately), and the PC.
7.1
Connecting the bq20z90/bq29330/bq29412 Circuit Module to a Battery Pack
Figure 7 shows how to connect the bq20z90/bq29330/bq29412 circuit module to the cells and system
load/charger.
The cells should be connected in the following order:
1. 4-Cell Pack: 1N (BAT-), 1P, and 2P (see Section 2.1 for definitions).
2. 3-Cell Pack: 1N (BAT-), 1P, 2P, and then connect 4P and 3P together.
3. 2-Cell Pack: 1N (BAT-), 1P, and then connect 4P, 3P, and 2P together
To start charge or discharge test, connect PRES pin to PACK- pin to set SYS PRES state. To test sleep
mode, disconnect the PRES pin.
Figure 7. bq20z90bq29330 Circuit Module Connection to Cells and System Load/Charger
7.2
PC Interface Connection
The following steps configure the hardware for interface to the PC:
1. Connect the bq20z90/bq29330-based smart battery to the EV2300 using wire leads as shown in
Table 5.
Table 5. Circuit Module to EV2300 Connections
bq20z90/bq29330-Based Battery
EV2300
SMBD
SMBD
SMBC
SMBC
VSS
GND
2. Connect the PC USB cable to the EV2300 and the PC USB port.
The bq20z90EVM-001 is now set up for operation.
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Operation
8
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Operation
This section details the operation of the bq20z90 EVSW software.
8.1
Starting the Program
Run bq20z90 EVSW from the Start | Programs | Texas Instruments | bq20z90 EVSW menu sequence.
The SBS Data screen (Figure 8) 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 65535 ms. Only items that are selected for scanning are scanned
within this period.
The bq20z90 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 65535 ms. The
Log interval cannot be smaller than scan interval because this results in the same value being logged at
least twice.
Figure 8. SBS Data Screen
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This screen (Figure 8) shows the SBS data set along with additional ManufacturersAccess() command
information such as individual cell measurements. Additional Flag and Static data can be viewed by
selecting the appropriate tab at the bottom of the SBS screen.
Data such as SBS.ManufacturerName( ) is static and does not change. This data is viewed separately
using the Static Data tab available at the bottom of the screen.
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 bq20z90 and bq29330 Options
The bq20z90 data flash comes configured per the default settings detailed in the bq20z90 data sheet.
Ensure that the settings are correctly changed to match the pack and application for the bq20z90/bq29330
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 9).
Figure 9. Data Flash Screen, 1st Level Safety Class
To read all the data from the bq20z90 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.
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Operation
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The data flash configuration can be saved to a file by selecting | File | Export | and entering a file name. A
data flash file can also be retrieved in this way, imported, and written to the bq20z90 using the | Write All |
button.
The configuration information of the bq29330 and module calibration data is also held in the bq20z90 data
flash.
The bq20z90 allows for an automatic data flash export function, similar to the SBS Data 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 there is a check 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 bq20z90 that is being used may not be supported by the
bqEVSW version that is being used. An upgrade may be required.
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Calibration Screen
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9
Calibration Screen
9.1
How to Calibrate
Before the bq20z90 is calibrated:
• Connect a load to Pack- and Pack+ that draws approximately 2 A and measures discharge current to
use the FETs.
• Connect a current source to Batt- and Pack- to calibrate without using the FETs.
• Measure the pack voltage from Batt+ to Batt- (Total of Cell voltages).
• Measure the temperature of the pack.
• These steps may or may not be required, depending on the type of calibration being performed.
Note that voltage calibration with cells attached requires special consideration. Cells must be in a resting
state. For additional information, go to the TI Web site (www.ti.com) and access the TI Knowledge Base
and search for bq20zxx Calibration Using EV Software.
9.2
To Calibrate the bq20z90
Select the types of calibration to be performed (see Figure 10).
Enter the measured values for the types selected.
If Voltage Calibration is selected, then enter the number of cells on the pack.
If Temperature Calibration is selected, then select the sensor that is to be calibrated.
If the load is connected between Pack+ and Pack-, then select the Use FETs check box.
Press the Calibrate Part button.
9.3
Board Offset Calibration
This performs the offset calibration for the current offset of the board.
Remove load/external voltage and short Pack- to Batt-.
Press the CC Board Offset Calibration button.
9.4
Pack Voltage Calibration
This calibrates the voltage at the AFE Pack pin.
Make sure Voltage Calibration has been performed for the pack. If Voltage Calibration is not performed,
then Pack Voltage Calibration calibrates incorrectly.
Remove load/external voltage applied between Pack+ and Pack-.
Press the Pack Voltage button to calibrate.
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Calibration Screen
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Figure 10. Calibration Screen
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Pro (Advanced) Screen
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10
Pro (Advanced) Screen
10.1 SMB Communication
The set of read/write operations over SMBus are not specific to any gas gauge. These are provided as
general-purpose communication tools (Figure 11).
10.2 Hexadecimal/Decimal Converter
These two boxes convert between hexadecimal and decimal as soon as values are typed into the boxes.
Invalid values may cause erroneous results.
When scaling converted hexadecimal values to a higher number of bytes, follow these rules:
• When unsigned is selected, the left pad contains zeroes.
• When signed is selected, the left pad contains zeroes for a positive number, or the left pad contains F
for negative numbers.
10.3 Programming
This screen allows device reprogramming from unencrypted and encrypted files.
Figure 11. Pro (Advanced) Screen
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Pro (Advanced) Screen
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Related Documentation from Texas Instruments
To obtain a copy of any of the following TI document, 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.
Data Sheets:
Literature Number:
bq20z90
SLUS662
bq29330
SLUS673
16
bq20z90EVM-001 SBS 1.1 Impedance Track™ Technology Enabled Battery
Management Solution Evaluation Module
SLUU234A – February 2006 – Revised October 2013
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