Texas Instruments bq27742EVM User manual

User's Guide
SLUUAX8–March 2014
bq27742EVM Single-Cell Impedance Track™ Technology
Evaluation Module
This evaluation module (EVM) is a complete evaluation system for the bq27742-G1 fuel gauge. The EVM
includes one bq27742 circuit module, a current sense resistor, two thermistors, and two protection N-
FETs. An EV2400 PC interface board and a PC USB cable are required for fuel gauge interface, but must
be ordered separately. The circuit module includes one bq27742 integrated circuit and all other onboard
components necessary to monitor and predict capacity for a pack-side fuel gauge solution and to perform
the protection. The circuit module connects directly across the battery cell. With the EV2400 interface
board and software, the user can read the bq27742 data registers, program the chipset for different pack
configurations, log cycling data for further evaluation, and evaluate the overall functionality of the bq27742
solution under different charge and discharge conditions. The latest Windows™-based PC software can
be downloaded from the product folder on the Texas Instruments Web site.
Contents
1 Features....................................................................................................................... 2
2 bq27742-Based Circuit Module ............................................................................................ 2
3 Circuit Module Physical Layouts, Bill of Materials, and Schematic ................................................... 3
4 EVM Hardware and Software Setup ...................................................................................... 8
5 Troubleshooting Unexpected Dialog Boxes.............................................................................. 8
6 Hardware Connection ....................................................................................................... 9
7 Operation.................................................................................................................... 11
8 Calibrate Screen............................................................................................................ 14
9 Firmware Screen ........................................................................................................... 16
10 Send HDQ Screen ......................................................................................................... 17
11 Related Documentation From Texas Instruments ..................................................................... 17
12 Revision History ............................................................................................................ 17
List of Figures
1 bq27742EVM Layout, Silk Screen......................................................................................... 3
2 Top Assembly ................................................................................................................ 4
3 Top Layer..................................................................................................................... 4
4 Bottom Layer ................................................................................................................. 4
5 Schematic..................................................................................................................... 7
6 bq27742 Circuit Module Connection to Cell and System Load/Charger ............................................. 9
7 Battery Management Studio Screen..................................................................................... 11
8 DataMemory Screen....................................................................................................... 12
9 Calibration Screen.......................................................................................................... 14
10 Firmware Screen ........................................................................................................... 16
List of Tables
1 Ordering Information ........................................................................................................ 2
2 Bill of Materials............................................................................................................... 5
3 Performance Specification Summary ..................................................................................... 8
4 Circuit Module to EV2300 Connections – I2C........................................................................... 10
5 Circuit Module to EV2300 Connections – HDQ ........................................................................ 10
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Features www.ti.com
1 Features
• Complete evaluation system for the bq27742 fuel gauge with Impedance Track™ Technology
• Populated circuit module for quick setup
• Personal computer (PC) software and interface board for easy evaluation
• Software that allows data logging for system analysis
• Ability to upgrade to the latest firmware version by flash reprogramming
1.1 Kit Contents
• bq27742 circuit module
This EVM is used for the evaluation of different bq27742-based products. Please ensure that you visit the
product Web folder at http://www.ti.com to download the latest firmware version, evaluation software, and
documentation for the associated product to be evaluated.
1.2 Ordering Information
Table 1. Ordering Information
EVM Part Number Chemistry Configuration Capacity
bq27742EVM Li-Ion 1 cell Any
2 bq27742-Based Circuit Module
The bq27742-based circuit module is a complete and compact example solution of a bq27742 circuit for
battery management. The circuit module incorporates a bq27742 battery fuel gauge IC, dual N-FETs for
high-side protection, and all other components necessary to protect and accurately predict the capacity of
a 1-series Li-ion cell.
2.1 Circuit Module Connections
Contacts on the circuit module provide the following connections:
• Direct connection to the battery cell (TB1 or TP1/TP2): CELL+ and CELL–
• Connect a charger power to TB2: PACK+ and PACK–, or short the PACK+ and CELL+ to wake up the
gauge, then remove the connection of PACK+ and CELL+ or the charger
• To the serial communications port: SDA, SCL, and VSS (J10) or HDQ and VSS (J8)
• The system load and charger connect across charger and load (TB2 or TP9/TP10): PACK–/LOAD–
and PACK+/LOAD+.
Impedance Track is a trademark of Texas Instruments.
Windows is a trademark of Microsoft Corporation.
Microsoft is a registered trademark of Microsoft Corporation.
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1
11 1
Ext.VSS
CELL Ext.
CELL+
CELL-
CELL-
+
CELL+
VPWR
CHG
BAT
DSG
RA0
TS
REG25
LOAD+
PACK-/
HDQ
THERM
LOAD-
PACK+/
FET
BYPASS
LOAD-
PACK-/
HDQ
VSS
AUX
TEMP
INT. 1.8V Pull up
HDQ PULLUP
TEXAS INSTRUMENTS
PWR628 Rev. A
SDA
SCL
VSS
bq27742EVM
C1
C2
C3
C4
C5
C6
C7
C8
D1
D2
J5
J7
J9
J11
J12 J13
J14
J15
J2 J3
J4
J6
J10
J8
R1
R10
R11
R13
R14R15
R18
R3
R4
R5
R6
R7
R8 R9
U1
J1
TB1
TB2
RT1
RT2
TP2
TP3
TP6
TP9
TP1
TP10
TP11
TP4
TP5
TP7
TP8
Q1
Q2 Q3
Q4
R2
www.ti.com bq27742-Based Circuit Module
2.2 Pin Descriptions
Pin Name Description
PACK+ Pack positive terminal
PACK– Pack negative terminal
CELL+ Cell positive terminal
CELL– Cell negative terminal
TERM Thermistor input that leads to IC TS pin
SDA I2C communication data line
SCL I2C communication clock line
HDQ Single-wire communication line
VSS Signal return for communication line
3 Circuit Module Physical Layouts, Bill of Materials, and Schematic
This section contains the printed-circuit board (PCB) layout, bill of materials, assembly drawings, and
schematic for the bq27742 circuit module.
3.1 Board Layout
This section shows the printed-circuit board (PCB) layers (Figure 1 through Figure 4), assembly drawing,
and schematic for the bq27742 module.
Figure 1. bq27742EVM Layout, Silk Screen
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Circuit Module Physical Layouts, Bill of Materials, and Schematic www.ti.com
Figure 2. Top Assembly
Figure 3. Top Layer
Figure 4. Bottom Layer
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www.ti.com Circuit Module Physical Layouts, Bill of Materials, and Schematic
3.2 Bill of Materials and Schematic
Table 2. Bill of Materials
Count Reference Value Description Size Part Number MFR
Designator
6 C1, C2, C5, 0.1 µF Capacitor, Ceramic, 10 V, 0402 GRM155R61A104KA01D Murata
C6, C7, C8 X5R, 10%
1 C3 1 µF Capacitor, Ceramic, 6.3 V, 0402 GRM155R60J105KE19D Murata
X5R, 10%
1 C4 0.47 µF Capacitor, Ceramic, 0.47 0402 GRM155R60J474KE19D Murata
µF, 6.3 V, X5R, 10%
2 D1, D2 AZ23C5V6-7 Diode, Dual, Zener, 5.6 V, SOT23 AZ23C5V6-7-F Diodes
300 mW
1 J1 ED555/2DS Terminal Block, 2-pin, 6-A, 0.27 x 0.25 ED555/2DS OST
3.5 mm inch
9 J2, J3, J4, PEC03SAAN Header, Male 3-pin, 100mil 0.100 inch x PEC03SAAN Sullins
J6, J11, spacing 3
J12, J13,
J14, J15
3 J5, J7, J9 PEC02SAAN Header, Male 2-pin, 100mil 0.100 inch x PEC02SAAN Sullins
spacing 2
2 J8, J10 22-05-3041 Header, Friction Lock 0.400 x 22-05-3041 Molex
Ass'y, 4-pin Right Angle 0.500
1 Q1 UPA2375T1P-E1- MOSFET, Dual N-Channel WSCP UPA2375T1P-E1-A Renesas
A NexFET, 12 V 3.2 A Electronics
America
0 Q2, Q3, Q4 DNP MOSFET, Dual N-Channel WSCP UPA2375T1P-E1-A Renesas
NexFET, 12 V 3.2 A Electronics
America
2 R1, R3 200 ΩResistor, Chip, 1/16-W, 5% 0402 CRCW0402200RJNED Vishay Dale
1 R12 4.7 kΩResistor, Chip, 1/16-W, 5% 0402 CRCW04024K70JNED Vishay Dale
1 R13 2 kΩResistor, Chip, 1/16-W, 5% 0402 CRCW04022K00JNED Vishay Dale
2 R14, R15 10 kΩResistor, Chip, 1/16-W, 5% 0402 CRCW040210K0JNED Vishay Dale
2 R16, R17 10 ΩResistor, Chip, 1/16-W, 5% 0402 CRCW040210R0JNED Vishay Dale
1 R2 5 mΩRes, Metal Current sense, 1632 MCS1632R005FER Ohmite
1W, ±1%, 50 ppm
6 R4, R6, R7, 100 ΩResistor, Chip, 1/16-W, 5% 0402 CRCW0402100RJNED Vishay Dale
R8, R9 R10
2 R5, R11 1 kΩResistor, Chip, 1/16-W, 5% 0402 CRCW04021K00JNED Vishay Dale
2 RT1, RT2 10 kΩThermistor, 10 kΩ0.095 x 103AT-2 Semitec
0.150 inch
1 TB1 ED1515 Terminal Block, 3-pin, 6-A, 0.41 x 0.25 ED555/3DS OST
3.5 mm inch
1 TB2 ED555/4DS Terminal Block, 4-pin, 6-A, 0.55 x 0.25 ED555/4DS OST
3.5 mm inch
7 TP1, TP4, 5001 Test Point, Black, Thru 0.100 x 5001 Keystone
TP5, TP7, Hole Color Keyed 0.100 inch
TP8, TP10,
TP11
4 TP2, TP3, 5000 Test Point, Red, Thru Hole 0.100 x 5000 Keystone
TP6, TP9 Color Keyed 0.100 inch
1 U1 bq27742YZFR-G1 IC, Single Cell Li-Ion Pack BGA-15 bq27742YZFR-G1 TI
Side Fuel Gauge with
Integrated Protection
1 -- PCB PWR231 Any
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Circuit Module Physical Layouts, Bill of Materials, and Schematic www.ti.com
(1) These assemblies are ESD sensitive, ESD precautions should 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) Reference designators marked with an asterisk ('**') cannot be substituted.
All other components can be substituted with equivalent manufacturer's components.
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www.ti.com Circuit Module Physical Layouts, Bill of Materials, and Schematic
Figure 5. Schematic
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3.3 bq27742 Circuit Module Performance Specification Summary
This section summarizes the performance specifications of the bq27742 circuit module.
Table 3. Performance Specification Summary
Specification Min Typ Max Unit
Input voltage Pack+ to Pack– 2.7 3.6 4.35 V
Charge and discharge current 0 1 2 A
4 EVM Hardware and Software Setup
This section describes how to install the bq27742EVM PC software, and how to connect the different
components of the EVM.
4.1 System Requirements
The Battery Management Studio software requires Windows XP or later. Using later versions of Windows
operating system can have issues with the USB driver support. The EV2300 USB drivers have been
tested for Windows 98SE and Windows XP, but no assurance is made for problem-free operation with
specific system configurations. The EV2300 interface board is not officially supported for 64-bit versions of
Windows and typically does not work with Windows 7 or newer. The EV2400 interface board is the
recommended USB-I2C interface for Windows 7 and other 64-bit versions. No driver installation is required
for use of EV2400 interface board. The EV2400 interface board has built-in I2C pullups while the EV2300
interface board does not. Jumpers J7 and J9 can be removed from the bq27742EVM if the EV2400
interface board is used.
4.2 Software Installation
Find the latest software version in the bq27742 tool folder on power.ti.com. Make a search by Part
Number for bq27742 to access the tool folder. Currently the most recent firmware version is bq27742-G1.
Use the following steps to install the bq27742 Battery Management Studio software:
1. Ensure that the EV2300 or EV2400 interface board is not connected to the personal computer (PC)
through the USB cable before starting this procedure.
2. Open the archive containing the installation package, and copy its contents into a temporary directory.
3. Open the software file that was downloaded from the TI Web site.
4. Follow the instructions on screen until completing the software installation.
5. Before starting the evaluation software, connect the EV2300 or EV2400 interface board to the
computer using the USB cable.
6. If the EV2300 interface board is connected, wait until system prompt New Hardware Found appears.
Choose Select Location Manually, and use the Browse button to point to subdirectory TIUSBWin2K-
XP-1.
7. Answer Continue to the warning that drivers are not certified with Microsoft®.
8. If the EV2300 interface board is connected, after the previous installation finishes, another system
prompt New Hardware Found appears. Repeat steps 1 through 5, but specify the directory as
TIUSBWin2K-XP-2.
9. Answer Continue to the warning that drivers are not certified with Microsoft. Driver installation is now
finished.
10. For the EV2400 interface board, the driver should be installed along with software installation.
5 Troubleshooting Unexpected Dialog Boxes
The user who is downloading the files must be logged in as the administrator. The driver is not signed, so
the administrator must allow installation of unsigned drivers in the operating system. If using Windows 7,
install the software with administrator privileges.
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USB
EV2300
SMB I2C HDQ
1
11 1
Ext.VSS
CELL Ext.
CELL+
CELL-
CELL-
+
CELL+
VPWR
CHG
BAT
DSG
RA0
TS
REG25
LOAD+
PACK-/
HDQ
THERM
LOAD-
PACK+/
FET
BYPASS
LOAD-
PACK-/
HDQ
VSS
AUX
TEMP
INT. 1.8V Pull up
HDQ PULLUP
TEXAS INSTRUMENTS
PWR628 Rev. A
SDA
SCL
VSS
bq27742EVM
C1
C2
C3
C4
C5
C6
C7
C8
D1
D2
J5
J7
J9
J11
J12 J13
J14
J15
J2 J3
J4
J6
J10
J8
R1
R10
R11
R13
R14R15
R18
R3
R4
R5
R6
R7
R8 R9
U1
J1
TB1
TB2
RT1
RT2
TP2
TP3
TP6
TP9
TP1
TP10
TP11
TP4
TP5
TP7
TP8
Q1
Q2 Q3
Q4
R2
bq27742 EVM
Power
Supply
3.6V
Load Charger
www.ti.com Hardware Connection
6 Hardware Connection
Use of the bq27742EVM-001 requires three hardware components:
• bq27742 circuit module
• EV2300 or EV2400 PC interface board
• Windows PC
.
6.1 Connecting the bq27742 Circuit Module to a Battery Cell
Figure 6 shows how to connect the bq27742 circuit module to the cell and system load/charger.
Figure 6. bq27742 Circuit Module Connection to Cell and System Load/Charger
6.2 PC Interface Connection
The bq27742 fuel gauge can be configured as an HDQ communication device or left in default as an I2C
device. Once the bq27742 fuel gauge is configured for HDQ communication, it cannot be reverted to I2C
mode. See Section 10 for information on configuring the bq27742 fuel gauge to HDQ mode.
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Hardware Connection www.ti.com
The following steps configure the hardware for interfacing to the PC:
1. Connect the bq27742-based EVM to the EV2300 interface board using wire leads as shown in Table 4
and Table 5.
Table 4. Circuit Module to EV2300 Connections – I2C
bq27742-Based Battery (I2C Mode) EV2300 (I2C Port)
SDA SDA
SCL SCL
VSS GND
Table 5. Circuit Module to EV2300 Connections – HDQ
bq27742-Based Battery (HDQ Mode) EV2300 (HDQ Port)
HDQ HDQ
VSS GND
2. Connect a charger to wake-up the gauge, can use a power supply between PACK+ and PACK– or
short CELL+ and PACK+. After wake-up, the charger can be removed.
3. Connect the PC USB cable to the EV2300 interface board and the PC USB port.
The bq27742EVM is now set up for operation.
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