Texas Instruments bq20z95EVM-001 User manual

User's GuideSLUU275 – October 2006
bq20z95EVM-001 SBS 1.1 Impedance Track™ TechnologyEnabled Battery Management Solution Evaluation Module
This evaluation module (EVM) is a complete evaluation system for the bq20z95/bq29412 batterymanagement system. The EVM includes one bq20z95/bq29412 circuit module, an EV2300 PC interfaceboard for gas gauge interface, a PC USB cable, and Windows™-based PC software. The circuit moduleincludes one bq20z95 integrated circuit (IC), one bq29412 IC, and all other onboard componentsnecessary to monitor and predict capacity, perform cell balancing, monitor critical parameters, protect thecells from overcharge, over-discharge, short-circuit, and overcurrent in 2-, 3- or 4-series cell Li-ion orLi-polymer battery packs. The circuit module connects directly across the cells in a battery. With theEV2300 interface board and software, the user can read the bq20z95 data registers, program the chipsetfor different pack configurations, log cycling data for further evaluation, and evaluate the overallfunctionality of the bq20z95/bq29412 solution under different charge and discharge conditions.
Contents1 Features ....................................................................................................................... 22 bq20z95-Based Circuit Module ............................................................................................ 23 bq20z95 Circuit Module Schematic ....................................................................................... 34 Circuit Module Physical Layouts and Bill of Materials .................................................................. 45 EVM Hardware and Software Setup ...................................................................................... 96 Troubleshooting Unexpected Dialog Boxes .............................................................................. 97 Hardware Connection ....................................................................................................... 98 Operation .................................................................................................................... 119 Calibration Screen.......................................................................................................... 1310 Pro (Advanced) Screen .................................................................................................... 1511 Pack Assembly and The bq20z95 ....................................................................................... 1612 Related Documentation from Texas Instruments ...................................................................... 17Trademarks ................................................................................................................. 17
List of Figures
1 bq20z95EVM-001 Layout (Silk Screen) .................................................................................. 42 Top Assembly ................................................................................................................ 53 Top Layer ..................................................................................................................... 54 Bottom Layer ................................................................................................................. 55 Bottom Assembly ............................................................................................................ 66 Schematic ..................................................................................................................... 87 bq20z95 Circuit Module Connection to Cells and System Load/Charger ........................................... 108 SBS Data Screen........................................................................................................... 119 Data Flash Screen, 1st Level Safety Class ............................................................................. 1210 Calibration Screen.......................................................................................................... 1411 Pro (Advanced) Screen .................................................................................................... 1512 Connection Sequence ..................................................................................................... 1613 Fuel Gauging Command .................................................................................................. 16
List of Tables
1 Ordering Information ........................................................................................................ 22 Components and Flash-Memory Settings for Different Precharge Modes ........................................... 43 Bill of Materials ............................................................................................................... 7
SLUU275 – October 2006 bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology 1Enabled Battery Management Solution Evaluation ModuleSubmit Documentation Feedback

1 Features
1.1 Kit Contents
1.2 Ordering Information
2 bq20z95-Based Circuit Module
2.1 Circuit Module Connections
Features www.ti.com
4 Performance Specification Summary ..................................................................................... 95 Circuit Module to EV2300 Connections ................................................................................. 10
•Complete evaluation system for the bq20z95 SBS 1.1-compliant advanced gas gauge with ImpedanceTrack™ technology 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
•bq20z95/bq29412 circuit module•EV2300 PC interface board•Software CD with the evaluation software•Connection cable to interface board•Set of support documentation•EV2300 USB interface board
Table 1. Ordering Information
EVM PART NUMBER CHEMISTRY CONFIGURATION CAPACITY
bq20z95EVM-001 Li-ion 2, 3, or 4 cell Any
The bq20z95/bq29412-based circuit module is a complete and compact example solution of a bq20z95circuit for battery management and protection of Li-ion or Li-polymer packs. The circuit moduleincorporates a bq20z95 battery monitor IC, bq29412 independent overvoltage protection IC, and all othercomponents necessary to accurately predict the capacity of 2-, 3-, or 4-series cells.
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)
2bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology SLUU275 – October 2006Enabled Battery Management Solution Evaluation Module
Submit Documentation Feedback

2.2 Pin Descriptions
3 bq20z95 Circuit Module Schematic
3.1 Schematic
3.2 Modifications for Choosing Particular Precharge Mode
www.ti.com bq20z95 Circuit Module Schematic
PIN NAME DESCRIPTION
1N -ve connection of first (bottom) cell1P +ve connection of first (bottom) cell2P +ve connection of second cell3P +ve connection of third cell4P +ve connection of fourth (top) cellSMBC Serial communication port clockSMBD Serial communication data portSYS PRES System present pin (if low, system is present)PACK- Pack negative terminalVSS Pack negative terminalPACK+ Pack positive terminal
This section contains information for modifying and choosing a precharge mode for bq20z95/bq29412implementation.
The schematic follows the bill of materials in this user's guide.
In order to charge, the charge FET (CHG-FET) must be turned on to create a current path. When theV
(BAT)
is 0 V and CHG-FET = ON, the V
(PACK)
is as low as the battery voltage. In this case, the supplyvoltage for the device is too low to operate. This function has three possible configurations, and the IC canbe 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) tosustain the PACK+ voltage level.2. Common FET mode - Does not use a dedicated precharge FET. The charge FET (CHG-FET) is set toON state as default.3. Precharge FET mode - Dedicates a precharge current path using an additional open-drain (OD) pindrive 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 , anduse the given settings of DF.Configuration, ZVCHG1, 0.
SLUU275 – October 2006 bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology 3Enabled Battery Management Solution Evaluation ModuleSubmit Documentation Feedback

3.3 Testing Fuse-Blowing Circuit
4 Circuit Module Physical Layouts and Bill of Materials
4.1 Board Layout
Circuit Module Physical Layouts and Bill of Materials www.ti.com
Table 2. Components and Flash-Memory Settings for Different PrechargeModes
MODE RESISTORS PRECHG FET ZVCHG1 ZVCHG0
1. 0-V Chg (default) R21, R28 Q3 0 02. Common FET R24 Q2 0 13. Precharge R23, R28 Q3 1 0
For more details about precharge operation and mode choices, see the bq20z95 data sheet at(SLUS757 ).
To prevent the loss of board functionality during the fuse-blowing test, the actual chemical fuse is notprovided in the circuit. FET Q4 drives TP3 low if a fuse-blow condition occurs; so, monitoring TP3 can beused to test this condition. Fuse placement on the application board is shown in the bq20z95 data sheetreference-board schematic.
This section contains the board layout, bill of materials, and assembly drawings for the bq20z95/bq29412circuit module.
This section shows the dimensions, PCB layers (Figure 1 through Figure 5 ), and assembly drawing for thebq20z95 module.
Figure 1. bq20z95EVM-001 Layout (Silk Screen)
4bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology SLUU275 – October 2006Enabled Battery Management Solution Evaluation Module
Submit Documentation Feedback

www.ti.com Circuit Module Physical Layouts and Bill of Materials
Figure 2. Top Assembly
Figure 3. Top Layer
Figure 4. Bottom Layer
SLUU275 – October 2006 bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology 5Enabled Battery Management Solution Evaluation ModuleSubmit Documentation Feedback

Circuit Module Physical Layouts and Bill of Materials www.ti.com
Figure 5. Bottom Assembly
6bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology SLUU275 – October 2006Enabled Battery Management Solution Evaluation Module
Submit Documentation Feedback

4.2 Bill of Materials and Schematic
www.ti.com Circuit Module Physical Layouts and Bill of Materials
Table 3. Bill of MaterialsCount RefDes Description Size Mfr Part Number
21 C1–C9, C12, Capacitor, Ceramic, 0.1 µF, 50 V, X7R, 20% 0603 Any STDC13, C15–C18,
C20, C23, C24,C26–C28
1 C11 Capacitor, Ceramic, 0.22 µF, 50 V, X7R, 20% 0603 Any STD
1 C19 Capacitor, Ceramic, 4.7 µF, 10 V, X7R, 20% 0603 Any STD
2 C22, C25 Capacitor, Ceramic, 0.47 µF, 16 V, X7R, 20% 0603 Any STD
3 C10, C14, C21 Capacitor, Ceramic, 1.0 µF, 25 V, X7R, 20% 0805 Any STD
4 D1–D3, D11 Diode, Switching, 150-mA, 75-V, 350mW SOT23 Vishay-Liteon BAS16
2 D4, D5 Diode, Dual, Zener, 5.6V, 300mW SOT23 Vishay- AZ23C5V6Telefunken
5 D6–D10 Diode, LED, Green, Gullwing, GW Type, 20ma, 7.5 0.120 ×0.087 Panasonic LN1361Cmcd typ. inches
1 J1 Header, Friction Lock Ass'y, 4-pin Right Angle, 0.400 ×0.500 Molex 22-05-3041
1 Q1 MOSFET, N-ch, 20-V, 1.3A, 0.16- ΩSOT23 Fairchild NDS331N
2 Q2, Q4 MOSFET, N-ch Logic Level, Power Trench, 30V, 11A, SO8 Fairchild FDS6690A12.5 m Ω
1 Q3 MOSFET, P-ch, 30-V, 8.0-A, 20-m ΩSO8 Siliconix Si4435DY
1 Q6 MOSFET, Nch, 50V, 0.22A, 6 ΩSOT23 Fairchild BSS138
12 R1–R5, R12, Resistor, Chip, 100- Ω, 1/16-W, 5% 0603 Std StdR13, R32–R34,
R38, R39
1 R11 Resistor, Chip, 0.010 Ω, 1-W, xx% 2512 Vishay WSL-2512-010 1%R86
3 R15, R16, R40 Resistor, Chip, 220 k Ω, 1/16-W, 5% 0603 Std Std
1 R17 Resistor, Chip, 300- Ω, 1-W, 10% 2512 WSL-2512-300 1%R86
2 R18, R27 Resistor, Chip, 3.01M Ω, 1/16-W, 5% 0603 Std Std
5 R14, R19, Resistor, Chip, 5.1k Ω, 1/16-W, 5% 0603 Std StdR21–R23
4 R20, R36, R37, Resistor, Chip, 1M Ω, 1/16-W, 5% 0603 Std StdR41
2 R24, R28 Resistor, Chip, 100k Ω, 1/16-W, 5% 0603 Std Std
2 R25, R29 Resistor, Chip, 8.45k Ω, 1/16-W, 1% 0603 Std Std
2 R26, R30 Resistor, Chip, 61.9k Ω, 1/16-W, 1% 0603 Std Std
7 R6–R10, R31, Resistor, Chip, 1k Ω, 1/16-W, 5% 0603 Std StdR35
2 RT1, RT2 Thermistor, 10k Ω0.095 ×0.150 Semitec NTC103AT
1 SW1 Switch, Push button, Momentary, N.O. Low Profile 5 mm ×5 mm Panasonic EVQPLCxxxx
2 TB1, TB4 Terminal Block, 2-pin, 6-A, 3,5mm 0.27 ×0.25 OST ED1514
2 TB2, TB3 Terminal Block, 3-pin, 6-A, 3,5mm 0.41 ×0.25 OST ED1515
1 TP1 Test Point, Black, Thru Hole Color Keyed 0.100 ×0.100 inch Keystone 5001
1 TP3 Test Point, White, Thru Hole Color Keyed 0.100 ×0.100 inch Keystone 5002
1 U1 IC, Voltage Protection for 2, 3, 4 Cell Lion , 2nd SSOP-08 TI BQ29412DCTProtection, 4.45 V OVP
1 U2 IC, Cool-GG Programmable Battery Management TSSOP30 TI bq20z95DBT
SLUU275 – October 2006 bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology 7Enabled Battery Management Solution Evaluation ModuleSubmit Documentation Feedback

4.3 bq20z95/bq29412 Circuit Module Performance Specification Summary
Circuit Module Physical Layouts and Bill of Materials www.ti.com
Figure 6. Schematic
This section summarizes the performance specifications of the bq20z95/bq29412 circuit module.
8bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology SLUU275 – October 2006Enabled Battery Management Solution Evaluation Module
Submit Documentation Feedback

5 EVM Hardware and Software Setup
5.1 System Requirements
5.2 Software Installation
6 Troubleshooting Unexpected Dialog Boxes
7 Hardware Connection
www.ti.com EVM Hardware and Software Setup
Table 4. Performance Specification Summary
Specification Minimum Typical Maximum Units
Input voltage Pack+ to Pack– 6 15 25 VCharge and discharge current 0 2 7 A
This section describes how to install the bq20z95EVM-001 PC software, and how to connect the differentcomponents of the EVM.
The bq20z95EVSW software requires Windows™ 2000 or Windows XP. Drivers for Windows 98SE areprovided, but Microsoft™ no longer supports Windows 98; and there may be issues in Windows 98 withUSB driver support. The EV2300 USB drivers have been tested for Windows 98SE, but no assurance ismade for problem-free operation with specific system configurations.
Find the latest software version in the bq20z95 tool folder on power.ti.com . Use the following steps toinstall the bq20z95EVSW software:1. Copy the files from the CD into the temporary directory you selected, open the archive TI USBDRVRS.zip, and extract its contents in a subdirectory/drivers. Choose preserve directory structureoption 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 thebrowse 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 procedureabove, but point to subdirectory TIUSBWin2K-XP-26. Answer continue to the warning that drivers are not certified with Microsoft. Installation of drivers isnow 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 toinstall 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.
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 operatingsystem policy.
The bq20z95EVM-001 comprises three hardware components: the bq20z95/bq29412 circuit module, theEV2300 PC interface board, and the PC.
SLUU275 – October 2006 bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology 9Enabled Battery Management Solution Evaluation ModuleSubmit Documentation Feedback

7.1 Connecting bq20z95/bq29412 Circuit Module to Battery Pack
7.2 PC Interface Connection
Hardware Connection www.ti.com
Figure 7 shows how to connect the bq20z95/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, 2P, 3P, and 4P (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 sleepmode, disconnect the PRES pin.
Figure 7. bq20z95 Circuit Module Connection to Cells and System Load/Charger
The following steps configure the hardware for interface to the PC:1. Connect the bq20z95-based smart battery to the EV2300 using wire leads as shown in Table 5 .
Table 5. Circuit Module to EV2300 Connections
bq20z95-Based Battery EV2300
SMBD SMBDSMBC SMBCVSS GND
2. Connect the PC USB cable to the EV2300 and the PC USB port.
The bq20z95EVM-001 is now set up for operation.
10 bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology SLUU275 – October 2006Enabled Battery Management Solution Evaluation Module
Submit Documentation Feedback

8 Operation
8.1 Starting the Program
www.ti.com Operation
This section details the operation of the bq20z95 EVSW software.
Run bq Evaluation Software from the Start | Programs | Texas Instruments | bq20z95 EVSW menusequence. The SBS Data screen (Figure 8 ) appears. Data begins to appear once the < Refresh> (singletime scan) button is clicked, or when the < Keep Scanning> check box is checked. To disable the scanfeature, deselect < Keep Scanning>.
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 scannedwithin this period.
The bq Evaluation Software provides a logging function which logs the values that were last scanned byEVSW. To enable this function, select the Start Logging button, this causes the Keep Scanning button tobe selected. When logging is Stopped, the keep scanning button is still selected and has to be manuallyunchecked.
The logging intervals are specified under the | Options | menu with the maximum value of 65535 ms. TheLog interval cannot be smaller than scan interval because this results in the same value being logged atleast twice.
Figure 8. SBS Data Screen
SLUU275 – October 2006 bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology 11Enabled Battery Management Solution Evaluation ModuleSubmit Documentation Feedback

8.2 Setting Programmable bq20z95 Options
Operation www.ti.com
This screen (Figure 8 ) shows the SBS data set along with additional ManufacturersAccess() commandinformation such as individual cell measurements. Additional Flag and Static data can be viewed byselecting 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 separatelyusing 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 ofthe Flags/Static Data display. Selecting | View |, then | Auto Arrange | returns the splitter bar to its originallocation.
The bq20z95 data flash comes configured per the default settings detailed in the bq20z95 data sheet.Ensure that the settings are correctly changed to match the pack and application for the bq20z95 solutionbeing 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 bq20z95 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 < Enter>, whichwrites the entire tab of flash data, or select menu option | Data Flash | Write All |. The data flash must beread 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 theexported data flash to a learned state ready for mass production use.
12 bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology SLUU275 – October 2006Enabled Battery Management Solution Evaluation Module
Submit Documentation Feedback

9 Calibration Screen
9.1 How to Calibrate
9.2 To Calibrate the bq20z95
9.3 Board Offset Calibration
9.4 Pack Voltage Calibration
www.ti.com Calibration Screen
The data flash configuration can be saved to a file by selecting | File | Export | and entering a file name. Adata flash file also can be retrieved in this way, imported, and written to the bq20z95 using the | Write All |button.
The configuration information of the bq29z95 and module calibration data also is held in the bq20z95 dataflash.
The bq20z95 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 filesnamed 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 AutoExportfilename also is set under the | Options menu |.
When a check mark is next to | AutoExport |, the AutoExport is in progress. The same menu selection isused to turn on / off AutoExport.
If the data flash screen is blank, then the bq20z95 that is being used may not be supported by thebqEVSW version that is being used. An upgrade may be required.
Before the bq20z95 is calibrated:•Connect a load to Pack- and Pack+ that draws approximately 2 A and measures discharge current touse 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 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 restingstate. For additional information, go to the TI Web site (www.ti.com ) and access the TI Knowledge Baseand search for bq20zxx Calibration Using EV Software.
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.
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.
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.
SLUU275 – October 2006 bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology 13Enabled Battery Management Solution Evaluation ModuleSubmit Documentation Feedback

Calibration Screen www.ti.com
Remove load/external voltage applied between Pack+ and Pack-.
Press the Pack Voltage button to calibrate.
Figure 10. Calibration Screen
14 bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology SLUU275 – October 2006Enabled Battery Management Solution Evaluation Module
Submit Documentation Feedback

10 Pro (Advanced) Screen
10.1 SMB Communication
10.2 Hexadecimal/Decimal Converter
10.3 Programming
www.ti.com Pro (Advanced) Screen
The set of read/write operations over SMBus are not specific to any gas gauge. These are provided asgeneral-purpose communication tools (Figure 11 ).
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 Ffor negative numbers.
This screen allows device reprogramming from unencrypted and encrypted files.
Figure 11. Pro (Advanced) Screen
SLUU275 – October 2006 bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology 15Enabled Battery Management Solution Evaluation ModuleSubmit Documentation Feedback

11 Pack Assembly and The bq20z95
CELL 4
+-
CELL 3
+-
CELL 2
+-
CELL 1
+-
1N1P2P
3P
4P EVM
Connector
Battery
Stack
Pack Assembly and The bq20z95 www.ti.com
This section describes a recommended assembly sequence for a bq20z95-based battery pack. Thisprocedure results in the most time-efficient setup of the battery pack. Following are the steps forconnecting a 4-series cell battery to the bq20z95EVM board. Review the application report bq20zxx EVMData Flash Settings for Number of Serial Cells and Pack Capacity,SLVA208 , for further details on 2- and3-series cell arrangements.
Figure 12. Connection Sequence
1. Connect the most negative terminal (– terminal of cell 1) of the serially-connected, 4-cell battery stackto the 1N PIN of the TB3–TB2 connector as shown in Figure 12 .2. Connect the positive terminal of cell 1 to 1P.3. Connect the positive terminal of cell 2 to 2P.4. Connect the positive terminal of cell 3 to 3P.5. Connect the positive terminal of the battery stack (+) to 4P.6. Connect external power (from 6 to 16.8V) to the Pack+ and Pack– terminals to wake up the EVM fromshutdown mode. External power does not need to remain connected once the bq20zxx has exitedShutdown Mode.7. Connect the SMBus connector (J1) to the EV2300 adapter and start the EV software.8. Navigate to the Flash Screen. Change the flash constants that correspond to the specific parametersof your application (refer to the data sheet or other application reports). For the first evaluation, thedefault values may be used.9. Navigate to the Calibration screen. Select the check-box for CC Offset Calibration. Click the calibratepart button. It should show OK.10. Uncheck previously-selected boxes. Select the check-box for voltage near Measured voltage field.Measure the actual pack voltage between pins 1N and 4P, and enter the value into the Enter actualvoltage field. Click the calibrate part button.11. To start fuel-gauging, navigate to the Pro screen in the EV software. Make sure that the Write SMBWord section reads: "SMB Command: 00 Word (hex): 0021" as shown in Figure 13 , and click the Writebutton.
Figure 13. Fuel Gauging Command
12. Navigate to the SMB Screen and be sure that the QEN bit in Operation Status is set (red). TheRelative State of Charge value is now updated to the correct value that corresponding to the state ofcharge of the attached cells.13. Now the pack is ready. Simulate insertion into a system by shorting between the Sys Pres (SystemPresent) and the VSS pins on the connector. At this point, the discharge and charge FETs are ON (asindicated by value of 0006 in the FET Status field in the SMB Screen of the EV software), andcharge/discharge tests can be conducted. This step in not needed if the NR bit (nonremovable pack) isenabled in Operation Cfg B register.
16 bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology SLUU275 – October 2006Enabled Battery Management Solution Evaluation Module
Submit Documentation Feedback

12 Related Documentation from Texas Instruments
Trademarks
www.ti.com Related Documentation from Texas Instruments
To obtain a copy of any of the following TI document, call the Texas Instruments Literature Response Center at [phone] orthe Product Information Center (PIC) at [phone]. 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
Document: Literature Number:
bq20z95, SBS-Compliant Gas Gauge Enabled With Impedance SLUS757Track™ data sheetbq20z90-110 + bq29330 Chipset technical reference manual SLUU264bq20z70 and bq20z90 application book SLUA404Quick-Start Guide for bq20zxx Family Gas Gauge application SLUA421report
bqEasy user's guide SLUU278
Impedance Track is a trademark of Texas Instruments.
Windows, Microsoft are trademarks of Microsoft Corporation.
SLUU275 – October 2006 bq20z95EVM-001 SBS 1.1 Impedance Track™ Technology 17Enabled Battery Management Solution Evaluation ModuleSubmit Documentation Feedback

EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must haveelectronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be completein terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmentalmeasures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit doesnot fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days fromthe date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYERAND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OFMERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claimsarising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and allappropriate precautions with regard to electrostatic discharge.EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANYINDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents orservices described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. Thisnotice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/orsafety programs, please contact the TI application engineer or visit www.ti.com/esh .No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, orcombination in which such TI products or services might be or are used.FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radiofrequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which aredesigned to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments maycause interference with radio communications, in which case the user at his own expense will be required to take whatever measures maybe required to correct this interference.
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 6 V to 25 V and the output voltage range of 0 V to 16.4 V.Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questionsconcerning the input range, please contact a TI field representative prior to connecting the input power.Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,please contact a TI field representative.During normal operation, some circuit components may have case temperatures greater than 60 °C. The EVM is designed to operateproperly with certain components above 60 °C as long as the input and output ranges are maintained. These components include but arenot limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identifiedusing the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation,please be aware that these devices may be very warm to the touch.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2009, Texas Instruments Incorporated

IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,and other changes to its products and services at any time and to discontinue any product or service without notice. Customers shouldobtain the latest relevant information before placing orders and should verify that such information is current and complete. All products aresold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standardwarranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except wheremandated by government requirements, testing of all parameters of each product is not necessarily performed.TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products andapplications using TI components. To minimize the risks associated with customer products and applications, customers should provideadequate design and operating safeguards.TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Informationpublished by TI regarding third-party products or services does not constitute a license from TI to use such products or services or awarranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectualproperty of the third party, or a license from TI under the patents or other intellectual property of TI.Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompaniedby all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptivebusiness practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additionalrestrictions.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids allexpress and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is notresponsible or liable for any such statements.TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonablybe expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governingsuch use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, andacknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their productsand any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may beprovided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products insuch safety-critical applications.TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products arespecifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet militaryspecifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely atthe Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products aredesignated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designatedproducts in automotive applications, TI will not be responsible for any failure to meet such requirements.Following are URLs where you can obtain information on other Texas Instruments products and application solutions:Products ApplicationsAmplifiers amplifier.ti.com Audio www.ti.com/audioData Converters dataconverter.ti.com Automotive www.ti.com/automotiveDLP® Products www.dlp.com Broadband www.ti.com/broadbandDSP dsp.ti.com Digital Control www.ti.com/digitalcontrolClocks and Timers www.ti.com/clocks Medical www.ti.com/medicalInterface interface.ti.com Military www.ti.com/militaryLogic logic.ti.com Optical Networking www.ti.com/opticalnetworkPower Mgmt power.ti.com Security www.ti.com/securityMicrocontrollers microcontroller.ti.com Telephony www.ti.com/telephonyRFID www.ti-rfid.com Video & Imaging www.ti.com/videoRF/IF and ZigBee® Solutions www.ti.com/lprf Wireless www.ti.com/wireless
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2009, Texas Instruments Incorporated