User's Guide
SLUU277A – October 2007 – Revised October 2013
bq20z75EVM-001 SBS 1.1 Impedance Track™ TechnologyEnabled Battery Management Solution EVM
This EVM is a complete evaluation system for the bq20z75/bq29412 battery management system. The
EVM includes one bq20z75/bq29412 circuit module, a current sense resistor, two thermistors and
Windows®- based PC software. The circuit module includes one bq20z75 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 Li-polymer battery packs. The circuit module connects directly across the cells
in a battery. An EV2300 board for gas gauge interface is required to interface this EVM with the PC and
can be purchased separately. With the EV2300 interface board and software, the user can read the
bq20z75 data registers, program the chipset for different pack configurations, log cycling data for further
evaluation, and evaluate the overall functionality of the bq20z75/bq29412 solution under different charge
and discharge conditions.
1
2
3
4
5
6
7
8
9
10
11
12
Contents
Features ...................................................................................................................... 2
bq20z75-Based Circuit Module ........................................................................................... 2
bq20z75 Circuit Module Schematic ....................................................................................... 3
Circuit Module Physical Layouts and Bill of Materials .................................................................. 3
EVM Hardware and Software Setup ..................................................................................... 9
Troubleshooting Unexpected Dialog Boxes ............................................................................ 10
Hardware Connection ..................................................................................................... 10
Operation ................................................................................................................... 12
Calibration Screen ......................................................................................................... 15
Pro (Advanced) Screen ................................................................................................... 17
Pack Assembly and the bq20zxx ........................................................................................ 18
Related Documentation from Texas Instruments ..................................................................... 19
List of Figures
1
Layout (Silk Screen) ........................................................................................................
4
2
Top Assembly ...............................................................................................................
4
3
Top Layer ....................................................................................................................
4
4
Bottom Layer
................................................................................................................
Bottom Assembly ...........................................................................................................
Schematic ....................................................................................................................
bq20z75 Circuit Module Connection to Cells and System Load/Charger ..........................................
SBS Data Screen ..........................................................................................................
Data Flash Screen, 1st Level Safety Class ............................................................................
Calibration Screen .........................................................................................................
Pro (Advanced) Screen ...................................................................................................
Connection Sequence ....................................................................................................
Fuel Gauging Command .................................................................................................
5
5
6
7
8
9
10
11
12
13
5
8
11
13
14
16
17
18
18
List of Tables
Impedance Track is a trademark of Texas Instruments.
Windows is a registered trademark of Microsoft Corporation.
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
Copyright © 2007–2013, Texas Instruments Incorporated
1
Features
1
1
Ordering Information ........................................................................................................
2
Bill of Materials ..............................................................................................................
6
3
Performance Specification Summary.....................................................................................
9
4
Circuit Module to EV2300 Connections
•
•
•
11
Complete evaluation system for the bq20z75 SBS 1.1-compliant advanced gas gauge with Impedance
Track technology 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
................................................................................
2
Features
•
1.1
www.ti.com
bq20z75/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
bq20z75EVM-001
Li-ion
2, 3, or 4 cell
Any
bq20z75-Based Circuit Module
The bq20z75/bq29412-based circuit module is a complete and compact example solution of a bq20z75
circuit for battery management and protection of Li-ion or Li-polymer packs. The circuit module
incorporates a bq20z75 battery monitor 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, VSS)
• The system load and charger connect across PACK+ and PACK–
• To the system present pin (SYS PRES)
2
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
Copyright © 2007–2013, Texas Instruments Incorporated
bq20z75 Circuit Module Schematic
www.ti.com
2.2
Pin Descriptions
PIN NAME
1N
1P
2P
3P
4P
SMBC
SMBD
VSS
PACK–
SYS PRES
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
Pack negative terminal
Pack negative terminal
System present pin (if low, system is present)
Pack positive terminal
bq20z75 Circuit Module Schematic
This section contains information for modifying and choosing a precharge mode for bq20z75/bq29412
implementation.
3.1
Schematic
The schematic follows the bill of materials in this user's guide.
3.2
Choosing Particular Precharge Mode
The chipset supports both a charger that has a precharge mode and one that does not. The EVM by
default supports a charger that does not have a precharge mode. This is configured by grounding the
PMS pin with a resistor. R17 and Q3 are used as the precharge current path in order to sustain sufficient
Pack+ voltage when the battery voltage is too low.
If the charger has a precharge function, R17 and FET Q3 are not used. The PMS pin must be pulled high
to disable ZVCHG output. The charge FET Q1 is used as the precharge FET, and the charger must
control the precharge current and voltage.
Note: The configuration at PMS pin is a hardware-level control. Once the bq20z75 is up and running, the
firmware may change the precharge settings. See the bq20z75 data sheet for further information.
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 Q1 drives TP3 low if a fuse-blow condition occurs; therefore, monitoring TP3
can be used to test this condition.
4
Circuit Module Physical Layouts and Bill of Materials
This section contains the board layout, bill of materials, and assembly drawings for the bq20z75/bq29412
circuit module.
4.1
Board Layout
This section shows the dimensions, PCB layers, and assembly drawing for the bq20z75 module.
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
Copyright © 2007–2013, Texas Instruments Incorporated
3
Circuit Module Physical Layouts and Bill of Materials
www.ti.com
Figure 1. Layout (Silk Screen)
Figure 2. Top Assembly
Figure 3. Top Layer
4
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
Copyright © 2007–2013, Texas Instruments Incorporated
Circuit Module Physical Layouts and Bill of Materials
www.ti.com
Figure 4. Bottom Layer
Figure 5. Bottom Assembly
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
Copyright © 2007–2013, Texas Instruments Incorporated
5
Circuit Module Physical Layouts and Bill of Materials
4.2
www.ti.com
Bill of Materials
Table 2. Bill of Materials
Count
RefDes
20
C1– C9, C12,
C13,
C15–C18,
C20, C23,
C24, C26,
C27
0.1μF
Value
Capacitor, Ceramic, 0.1-μF, 50 V, X7R, 20%
Description
0603
Size
STD
Part Number
Any
Mfr
1
C11
0.22μF
Capacitor, Ceramic, 0.22-μF, 50-V, X7R, 20%
0603
STD
Any
1
C19
2.2μF
Capacitor, Ceramic, 2.2-μF, 10-V, X7R, 20%
0805
Std
Any
2
C22, C25
0.47μF
Capacitor, Ceramic, 0.47-μF, 16-V, X7R, 20%
0603
STD
Any
3
C10, C14,
C21
1.0μF
Capacitor, Ceramic, 1.0-μF, 25-V, X7R, 20%
0805
STD
Any
4
D1, D2, D3,
D6
BAS16
Diode, Switching, 150-mA, 75-V, 350-mW
SOT23
BAS16
Vishay
2
D4, D5
AZ23C5V6
Diode, Dual, Zener, 5.6-V, 300-mW
SOT23
AZ23C5V6
Vishay
1
J1
22-05-3041
Header, Friction Lock Ass'y, 4-pin Right Angle,
0.400 × 0.500
22-05-3041
Molex
1
Q1
NDS331N
MOSFET, N-ch, 20-V, 1.3-A, 0.16-Ω
SOT23
NDS331N
Fairchild
2
Q2, Q4
FDS6690A
MOSFET, N-ch Logic Level, Power Trench, 30-V,
11-A, 12.5-mΩ
SO8
FDS6690A
Fairchild
1
Q3
Si4435DY
MOSFET, P-ch, 30-V, 8.0-A, 20-mΩ
SO8
Si4435DY
Siliconix
1
Q5
2N7002DICT
MOSFET, N-ch, 60-V, 115-mA, 1.2-Ω
SOT23
2N7002DICT
Vishay-Liteon
12
R1– R5, R12,
R13, R32–
R34, R38,
R39
100
Resistor, Chip, 100-Ω, 1/16-W, 5%
0603
Std
Std
1
R11
0.010 75ppm
Resistor, Chip, 0.010-Ω, 1-W, xx%
2512
WSL-2512-010 1% R86
Vishay
2
R15, R16
220K
Resistor, Chip, 220-kΩ, 1/16-W, 5%
0603
Std
Std
1
R17
300
Resistor, Chip, 300-Ω, 1-W, 10%
2512
WSL-2512-300 1% R86
2
R18, R27
3.01M
Resistor, Chip, 3.01-MΩ, 1/16-W, 5%
0603
Std
Std
5
R14, R19,
R21–R23
5.1K
Resistor, Chip, 5.1-kΩ, 1/16-W, 5%
0603
Std
Std
4
R20, R36,
R37, R40
1M
Resistor, Chip, 1-MΩ, 1/16-W, 5%
0603
Std
Std
3
R24, R28,
R41
100K
Resistor, Chip, 100-kΩ, 1/16-W, 5%
0603
Std
Std
2
R25, R29
8.45K
Resistor, Chip, 8.45-kΩ, 1/16-W, 1%
0603
Std
Std
2
R26, R30
61.9K
Resistor, Chip, 61.9-kΩ, 1/16-W, 1%
0603
Std
Std
1
R35
1.00K
Resistor, Chip, 1-kΩ, 1/16-W, 5%
0603
Std
Std
6
R6– R10,
R31
1K
Resistor, Chip, 1-kΩ, 1/16-W, 5%
0603
Std
Std
2
RT1, RT2
10K
Thermistor, 10-kΩ
0.095 × 0.150
NTC103AT
Semitec
2
TB1, TB4
ED1514
Terminal Block, 2-pin, 6-A, 3,5mm
0.27 × 0.25
ED1514
OST
2
TB2, TB3
ED1515
Terminal Block, 3-pin, 6-A, 3,5mm
0.41 × 0.25
ED1515
OST
1
TP1
GND
Test Point, Black, Thru Hole Color Keyed
0.100 × 0.100 inch
5001
Keystone
1
TP2
2.5V
Test Point, Red, Thru Hole Color Keyed
0.100 x 0.100 inch
5000
Keystone
1
TP3
FUSE
Test Point, White, Thru Hole Color Keyed
0.100 × 0.100 inch
5002
Keystone
1
U1
BQ29412DCT IC, Voltage Protection for 2, 3, 4 Cell Lion , 2nd
Protection, 4.45 v OVP
SSOP-08
BQ29412DCT
TI
1
U2
BQ20Z75DBT IC
TSSOP-38 (DBT)
BQ20Z75DBT
TI
2
J5 mate
Connector, Female, 0.100 Centers
22-01-3047
Molex
8
N/A
Terminals, Crimp, Tin
08-50-0114
Molex
N/A
Wire, Insulated 24 Awg, Red, 18 inches (±3 inches) (USB_5V)
1854-3
Alpha
N/A
Wire, Insulated 24 Awg, White, 18 inches (±3 inches) (SCL)
1854-1
Alpha
N/A
Wire, Insulated 24 Awg, Black, 18 inches (±3 inches) (GND)
1854-2
Alpha
N/A
Wire, Insulated 24 Awg, Brown, 18 inches (±3 inches) (SDA)
1854-7
Alpha
Connector
6
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
Copyright © 2007–2013, Texas Instruments Incorporated
Circuit Module Physical Layouts and Bill of Materials
www.ti.com
Table 2. Bill of Materials (continued)
Count
1
RefDes
N/A
Value
Description
Size
Heatshrink 1"
Part Number
Any
Mfr
Any
Notes 1. These assemblies are ESD sensitive, ESD precautions shall be observed.
2. These assemblies must be clean and free from flux and all contaminants.
Use of no clean flux is not acceptable.
3. These assemblies must comply with workmanship standards IPC-A-610 Class 2.
4. Ref designators marked with an asterisk ('**') cannot be substituted.
All other components can be substituted with equivalent MFG's components.
5. Make one SMBus connector wire assembly for each assembly produced, from J5 male, 4–24 Awg wires and
Red – Pin #4 — (Signal USB_5V)
Brown – Pin #3 — (Signal SDA)
White – Pin #2 — (Signal SCL)
Black – Pin #1 — (GND)
6. RT1 and RT2 should be assembled horizontally laying flat against the board Edge.
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
Copyright © 2007–2013, Texas Instruments Incorporated
7
Circuit Module Physical Layouts and Bill of Materials
www.ti.com
Figure 6. Schematic
8
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
Copyright © 2007–2013, Texas Instruments Incorporated
EVM Hardware and Software Setup
www.ti.com
4.3
bq20z75/bq29412 Circuit Module Performance Specification Summary
This section summarizes the performance specifications of the bq20z75/bq29412 circuit module.
Table 3. Performance Specification Summary
Specification
5
Min
Typ
Max
Unit
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 bq20z75EVM-001 PC software, and how to connect the different
components of the EVM.
5.1
System Requirements
The bq20z75 evaluation software requires Windows 2000 or Windows XP. Drivers for Windows 98SE are
provided, but Microsoft no longer supports Windows 98; Windows 98 may have issues 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 bq20z75 tool folder on power.ti.com. Use the following steps to
install the bq20z75 evaluation software from the compact disk (CD):
1. Copy the files from the CD into a temporary directory you selected; double-click on bqEV-EASY
Setup00.09.36.exe, and follow the installer instructions to complete the bq20z75 EVSW installation.
2. If the EV2300 was not previously installed, after bq20z75 EVSW installation, a TI USB DRIVER
INSTALLER pops up. Click "Yes" for the agreement message and follow its instructions. Two drivers
are associated with the EV2300. Follow the instruction to install both. Do not reboot the computer even
if asked to do so.
3. Plug the EV2300 into a USB port. The Windows system may show a prompt saying that new hardware
has been found. When asked "Can Windows connect to Windows Update to search for software?",
select "No, not this time," and click on "NEXT". In the next dialog window, it indicates "This wizard
helps you install software for: TI USB Firmware Updater." Select "Install the software automatically
(Recommended)," and click "NEXT". It is common for the next screen to be the Confirm File Replace
screen. Click "No" to continue. If this screen does not appear, then go to the next step. After Windows
indicates that the installation has finished, a similar dialog window pops up to install the second driver.
Proceed with the same installation preference as the first one. The second driver is "TI USB bq80xx
Driver".
4. The Win98 Driver can be found in the archive Win98EV2300Drivers-DocUpdateDec1703.zip under the
"EV2300 Drivers" folder.
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
Copyright © 2007–2013, Texas Instruments Incorporated
9
Troubleshooting Unexpected Dialog Boxes
www.ti.com
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 - 4.
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.
7
Hardware Connection
The bq20z75EVM-001 comprises three hardware components: the bq20z75/bq29412 circuit module, the
EV2300 PC interface board (purchased separately), and the PC.
10
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
Copyright © 2007–2013, Texas Instruments Incorporated
Hardware Connection
www.ti.com
7.1
Connecting the bq20z75/bq29412 Circuit Module to a Battery Pack
Figure 7 shows how to connect the bq20z75/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 SYS PRES pin to PACK- pin to set SYS PRES state. To test
sleep mode, disconnect the SYS PRES pin.
Figure 7. bq20z75 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 bq20z75-based smart battery to the EV2300 using wire leads as shown in Table 4.
Table 4. Circuit Module to EV2300 Connections
bq20z75-Based Battery
EV2300
SMBD
SMBD
SMBC
SMBC
VSS
GND
2. Connect the PC USB cable to the EV2300 and the PC USB port.
The bq20z75EVM-001 is now set up for operation.
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
Copyright © 2007–2013, Texas Instruments Incorporated
11
Operation
8
www.ti.com
Operation
This section details the operation of the bq20z75 EVSW software. Note: the EV2300 driver does not
support Windows Sleep or Hibernate. In case there is a problem communicating with the EV2300 or the
EVM, first unplug the USB cable then plug it back in. If the problem persists, check whether the EVM is in
Shutdown mode. The bq20z75 can be waken up by momentarily applying a voltage higher than 5.5V (but
less than 25V) at Pack+ pin of the EVM.
8.1
Starting the Program
With the EV2300 and the bq20z75 EVM connected to the computer, run bq20z75 EVSW from the Start |
Programs | Texas Instruments | bq20z75 EVSW menu sequence. The SBS Data screen 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 bq20z75 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 interval are specified under the |Options| menu with the maximum value of 65535
milliseconds. The Log interval cannot be smaller than the scan interval because this results in the same
value being logged at least twice.
12
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
Copyright © 2007–2013, Texas Instruments Incorporated
Operation
www.ti.com
Figure 8. SBS Data Screen
This screen 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 bq20z75 Options
The bq20z75 data flash comes configured per the default settings detailed in the bq20z75 data sheet
(SLUS723) and bq20z75 Technical Reference literature (SLUU262). Ensure that the settings are correctly
changed to match the pack and application for the bq20z75 solution being evaluated.
IMPORTANT: The correct setting of these options is essential to get the best performance.
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
Copyright © 2007–2013, Texas Instruments Incorporated
13
Operation
www.ti.com
The settings can be configured using the Data Flash screen.
Figure 9. Data Flash Screen, 1st Level Safety Class
To read all the data from the bq20z75 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 can also be retrieved in this way, imported, and written to the bq20z75 using the | Write All |
button.
The configuration information and module calibration data is held in the bq20z75 data flash.
The bq20z75 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.
14
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
Copyright © 2007–2013, Texas Instruments Incorporated
Calibration Screen
www.ti.com
The AutoExport interval is set under the | Options menu | with a minimum value of 15 seconds. 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 bq20z75 that is being used may not be supported by the
bqEVSW version that is being used. An upgrade may be required.
9
Calibration Screen
9.1
How to Calibrate
Before the bq20z75 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.
9.2
To Calibrate the bq20z75
Select the types of calibration to be performed.
Enter the measured values for the types selected (Except for CC Offset Calibration).
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.
Press the Software 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. Make sure to have a stable charger
voltage higher than 8V present at Pack+.
Press the Pack Voltage button to calibrate.
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
Copyright © 2007–2013, Texas Instruments Incorporated
15
Calibration Screen
www.ti.com
Figure 10. Calibration Screen
16
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
Copyright © 2007–2013, Texas Instruments Incorporated
Pro (Advanced) Screen
www.ti.com
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.
10.2 Hex/Decimal Converter
These two boxes convert between hexadecimal (hex) and decimal as soon as values are typed into the
boxes. Invalid values may cause erroneous results.
When scaling converted hex 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
Allows for device reprogramming from unencrypted and encrypted files.
Figure 11. Pro (Advanced) Screen
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
Copyright © 2007–2013, Texas Instruments Incorporated
17
Pack Assembly and the bq20zxx
11
www.ti.com
Pack Assembly and the bq20zxx
This procedure results in the most time-efficient setup of the battery pack. Following are the steps for
connecting a 4-series cell battery to the bq20z75EVM board. Review the application report bq20zxx EVM
Data Flash Settings for Number of Serial Cells and Pack Capacity, SLVA208, for further details on 2- and
3-series cell arrangements.
3P
4P
+
-
CELL 4
2P
+
-
CELL 3
1P
+
-
CELL 2
EVM
Connector
1N
+
-
Battery
Stack
CELL 1
Figure 12. Connection Sequence
1. Connect the most negative terminal (– terminal of cell 1) of the serially-connected, 4-cell battery stack
to 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 from
shutdown mode. External power does not need to remain connected once the bq20zxx has exited
Shutdown 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 parameters
of your application (refer to the data sheet or other application reports). For the first evaluation, the
default values may be used.
9. Navigate to the Calibration screen. Select the check-box for CC Offset Calibration. Click the calibrate
part 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 actual
voltage 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 SMB
Word section reads: "SMB Command: 00 Word (hex): 0021" as shown in Figure 13, and click the Write
button.
Figure 13. Fuel Gauging Command
12. Navigate to the SMB Screen and be sure that the QEN bit in Operation Status is set (red). The
Relative State of Charge value is now updated to the correct value that corresponding to the state of
charge of the attached cells.
13. Now the pack is ready. Simulate insertion into a system by shorting between the Sys Pres (System
Present) and the VSS pins on the connector. At this point, the discharge and charge FETs are ON (as
indicated by value of 0006 in the FET Status field in the SMB Screen of the EV software), and
charge/discharge tests can be conducted. This step in not needed if the NR bit (nonremovable pack) is
enabled in Operation Cfg B register.
18
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
Copyright © 2007–2013, Texas Instruments Incorporated
Related Documentation from Texas Instruments
www.ti.com
12
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
Documents:
bq20z75 Data Sheet
bq20z75 Technical Reference
bq29330 Data Sheet
bq20z70-V110 Technical Reference
bqEASY User's Guide
Quick-Start Guide for bq20zxx Family Gas Gauges Application
Report
bq20z70 and bq20z90 Application Book
SLUU277A – October 2007 – Revised October 2013
Submit Documentation Feedback
Literature Number:
SLUS686
SLUU250
SLUS673
SLUU265
SLUU278
SLUA421
SLUA404
bq20z75EVM-001 SBS 1.1 Impedance Track™ Technology-Enabled Battery
Management Solution EVM
Copyright © 2007–2013, Texas Instruments Incorporated
19
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other
changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest
issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and
complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale
supplied at the time of order acknowledgment.
TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms
and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary
to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily
performed.
TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and
applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or
other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information
published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or
endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the
third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration
and is accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such altered
documentation. Information of third parties may be subject to additional restrictions.
Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service
voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice.
TI is not responsible or liable for any such statements.
Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements
concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support
that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which
anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause
harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use
of any TI components in safety-critical applications.
In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to
help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and
requirements. Nonetheless, such components are subject to these terms.
No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties
have executed a special agreement specifically governing such use.
Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in
military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components
which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and
regulatory requirements in connection with such use.
TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of
non-designated products, TI will not be responsible for any failure to meet ISO/TS16949.
Products
Applications
Audio
www.ti.com/audio
Automotive and Transportation
www.ti.com/automotive
Amplifiers
amplifier.ti.com
Communications and Telecom
www.ti.com/communications
Data Converters
dataconverter.ti.com
Computers and Peripherals
www.ti.com/computers
DLP® Products
www.dlp.com
Consumer Electronics
www.ti.com/consumer-apps
DSP
dsp.ti.com
Energy and Lighting
www.ti.com/energy
Clocks and Timers
www.ti.com/clocks
Industrial
www.ti.com/industrial
Interface
interface.ti.com
Medical
www.ti.com/medical
Logic
logic.ti.com
Security
www.ti.com/security
Power Mgmt
power.ti.com
Space, Avionics and Defense
www.ti.com/space-avionics-defense
Microcontrollers
microcontroller.ti.com
Video and Imaging
www.ti.com/video
RFID
www.ti-rfid.com
OMAP Applications Processors
www.ti.com/omap
TI E2E Community
e2e.ti.com
Wireless Connectivity
www.ti.com/wirelessconnectivity
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2015, Texas Instruments Incorporated