Table of Contents
Advertisement
Quick Links
The bq77908AEVM-001 evaluation module (EVM) is a complete evaluation system for the bq77908A, a
4-series to 8-series cell Li-Ion battery protection integrated circuit. The EVM consists of a bq77908A circuit
module and a resistor cell simulator module, which can be used for simple evaluation of the bq77908A
functions. The circuit module includes one bq77908A integrated circuit (IC), sense resistor, power FETs
and all other onboard components necessary to protect the cells from overcharge, overdischarge, short
circuit, and overcurrent discharge in a 8-series cell Li-Ion or Li-Polymer battery pack. The circuit module
connects directly across the cells in a battery. With a compatible interface board and Windows
software, the user can view the bq77908A registers and program the IC configuration and protection
limits.
......................................................................................................................
1
1.1
1.2
2
2.1
2.2
3
3.1
3.2
3.3
3.4
3.5
3.6
4
4.1
4.2
4.3
5
5.1
5.2
5.3
5.4
5.5
6
7
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
Windows, Microsoft are registered trademarks of Microsoft Corporation.
Aardvark is a trademark of Total Phase, Inc.
SLUU854 - February 2012
Submit Documentation Feedback
bq77908AEVM Evaluation Module
Contents
.........................................................................................................
...............................................................................................
................................................................................
......................................................................................
................................................................................................
..............................................................................................
....................................................................................
....................................................................................
..................................................................................................
....................................................................................................
...................................................................................................
........................................................................................................
.............................................................................................
...................................................................................................
........................................................................................................
.................................................................................................
..................................................................................
.....................................................................................................
.................................................................................
.........................................................................
...........................................................................................
.....................................................................................................
.........................................................................
...............................................................................................
.....................................................................................
..................................................................................................
.......................................................................................................
................................................................................................
.................................................................................
Copyright © 2012, Texas Instruments Incorporated
.................................................................
..........................................
.....................................................................
................................................................
bq77908AEVM Evaluation Module
User's Guide
SLUU854 - February 2012
-based PC
®
3
3
3
3
3
4
5
5
6
6
6
7
8
8
8
8
10
10
12
14
16
17
17
18
18
18
18
18
20
20
20
21
21
21
1
Advertisement
Table of Contents
Subscribe to Our Youtube Channel
Related Manuals for Texas Instruments bq77908AEVM
Summary of Contents for Texas Instruments bq77908AEVM
-
Page 1: Table Of Contents
SLUU854 – February 2012 bq77908AEVM Evaluation Module The bq77908AEVM-001 evaluation module (EVM) is a complete evaluation system for the bq77908A, a 4-series to 8-series cell Li-Ion battery protection integrated circuit. The EVM consists of a bq77908A circuit module and a resistor cell simulator module, which can be used for simple evaluation of the bq77908A functions. - Page 2 Status Section Indicator Colors ................... Cell Count Component Configuration ................bq77908A Circuit Module Bill of Materials ................... Performance Specification Summary ..................Resistor Simulator Bill of Materials SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...
-
Page 3: Features
DC power supply, ~3 V at .1 A or an approximately 15-kΩ, 1/4-W resistor • Test leads to connect equipment The following equipment is required to operate the bq77908AEVM with a more extensive demonstration. • TI USB-TO-GPIO interface adapter •... -
Page 4: Signal Descriptions
Signal reference for the IC ECLK Serial interface clock connection EDATA Serial interface data connection Regulated 14-V input for IC programming Signal reference for the IC bq77908AEVM Evaluation Module SLUU854 – February 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 5: Bq77908Aevm Hardware Connection And Operation
Hardware Connection and Operation www.ti.com Test header or pattern signals are described in Table Table 5. Test Header Signals Reference Usage Pin Number Signal Description Designator Default: shunt installed Battery feed Power feed to 100-Ω shunt resistor for normal operation. -
Page 6: Connecting The Cell Simulator
Hardware Connection and Operation www.ti.com A communication interface is not required for basic operation; it must be connected to the computer and EVM circuit module only after proper installation of software. The software along with an appropriate communication interface allows setting the programmable safety limits of the device and checking the status after fault detection. -
Page 7: Basic Operation
Hardware Connection and Operation www.ti.com CAUTION The bq77908A circuit module may be damaged by overtemperature. To avoid damage, monitor the temperature during evaluation, and provide cooling as needed for your system environment. WARNING The bq77908A circuit module may become hot during operation due to dissipation of heat. -
Page 8: Cell Connections
6. When removing cells, remove any charger and CHGCTL connection, then disconnect in the reverse order. Software Installation This section describes how to install the software for the bq77908AEVM-001. The BQ77908-10-GUI SW supports the bq77908A, and is described in this document as bq77908A evaluation software. -
Page 9: Successfully Updated Ti Usb Interface Adapter
EVM from Texas Instruments, and its default firmware is not compatible with the bq77908A. If the firmware has already been updated to version 2.0.19 to work with other BMS-HCE products, additional update is not required. If required, update the firmware using the following steps. -
Page 10: Installing The Bq77908Gui Or Bq77910Gui Evaluation Software
Although the software will run without connection to a powered device, it is recommended to have the device on when starting the software. Figure 3 shows connections for operation with the GUI software. SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 11: Evm Connection For Communication And Programming
4. Connect the battery power supply to the EVM, and adjust to approximately 29 Vdc. 5. Wake the bq77908A by connecting CHGCTL high. 6. Start the software, typically using Start → All Programs → Texas Instruments → bq77908A Evaluation. When started, the software looks for the communication interface and the device. When communication is... -
Page 12: Menu Commands
(red X button). Selection of an adapter other than the two shown is not supported. SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 13: Communication Selection Window
EEPROM values to the volatile registers. The software does not know if power has been removed from the part and will continue to display the values, even though the device may have different values. Registers should be read before use. SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 14: Working With Register Values
Reading the registers or copying EEPROM values to the volatile registers is recommended before any change. SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... - Page 15 SCC is typically the lowest value threshold in the device and is common after programming or other communication with the part, depending on the device settings and operating environment. SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...
-
Page 16: Status Section
Bright red Device is polling and status is fault Dark green or dark red Device is not polling and value is residual from last poll bq77908AEVM Evaluation Module SLUU854 – February 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 17: Basic Operation With Software
19. Set the supply to 0 V, and turn off equipment. Operation With Other Interfaces or Hosts The bq77910 GUI software does not support other interfaces. SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 18: Related Documents From Texas Instruments
CMOS levels. Related Documents 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... -
Page 19: Cell Count Component Configuration
Circuit Description and Configuration www.ti.com capacitors are discharged into the device during balancing. The filter effect both reduces cell transients to the device inputs and slows voltage recovery after balancing. The resulting time constant is complicated due to the multiple components but relatively short due to the small resistors used for high balancing current. -
Page 20: Ground Connection
Ground Connection The IC VSS (ground) reference on the bq77908AEVM-001 circuit module is connected to the BATT– at the sense resistor. Note the range of the inputs when considering moving the ground location in an application design. -
Page 21: Fet Circuits
This can result in an increased supply current. Look for TI application reports related to the device for alternate series FET configurations on the Texas Instruments Web site.. C34 and C35 provide an ESD path and high-frequency bypass during switching of the discharge FET. -
Page 22: 7.10 Reserved Pins
7.12 Thermal Sensor The thermal protection on the bq77908AEVM circuit module is set to provide a trip threshold between 65°C and 70°C with nominal values. Component tolerances and substitute values may alter this trip point. -
Page 23: Bq77908A Circuit Module Physical Construction
Circuit Module Physical Construction This section contains the PCB layout, bill of materials, and schematic of the bq77908AEVM circuit module. The bq77908AEVM-001 consists of two circuit module assemblies, the bq77908AEVM main board or HPA731, and the resistor simulator or HPA582. -
Page 24: Top Assembly
Circuit Module Physical Construction www.ti.com Figure 11. Top Assembly Figure 12. Top Layer SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 25: Layer 2
Circuit Module Physical Construction www.ti.com Figure 13. Layer 2 Figure 14. Layer 3 SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 26: Bottom Layer
Circuit Module Physical Construction www.ti.com Figure 15. Bottom Layer Figure 16. Bottom Silkscreen SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 27: Bottom Assembly
Aavid Thermalloy Heatsink, Pattern only, TO-220/218 vertical 0.640 x 0.640 inch J1, J2 PEC02SAAN Header, Male 2-pin, 100mil spacing 0.100 inch x 2 PEC02SAAN Sullins SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... - Page 28 P5 (##) ** TERMBLOCK PLUG 6POS 3.81MM 1827169 Phoenix Contact — Standoff, M-F threaded 6-32, 0.5", Nylon 4816 Keystone — Nut, Hex, 6-32, Nylon SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...
- Page 29 6. Provide connectors (##) with assembly, install on J4 and J5 after test 7. Install shunt on J1 during test 8. Install standoffs at board corners, nut on top SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...
-
Page 30: Schematic Diagram, Sheet 1 Of 2
Circuit Module Physical Construction www.ti.com Figure 18. Schematic Diagram, Sheet 1 of 2 SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 31: Schematic Diagram, Sheet 2 Of 2
Circuit Module Performance Specification Summary This section summarizes the performance specifications of the bq77908A circuit module in its default 8-cell parallel FET configuration. SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 32: Resistor Cell Simulator
Additional patterns are included on the board for test points. Figure 20. Resistor Simulator Top Silkscreen SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 33: Resistor Simulator Top Layer
Circuit Module Physical Construction www.ti.com Figure 21. Resistor Simulator Top Layer SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 34: Resistor Simulator Bottom Layer
Circuit Module Physical Construction www.ti.com Figure 22. Resistor Simulator Bottom Layer SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 35: Resistor Simulator Top Assembly
Circuit Module Physical Construction www.ti.com Figure 23. Resistor Simulator Top Assembly SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 36: Resistor Simulator Bottom Assembly
0.038 inch — PCB, 2 In x 1.75 In x 0.062 In HPA582 Notes: 1. These assemblies are ESD sensitive; ESD precautions shall be observed. SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... - Page 37 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 MFG's components. SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...
-
Page 38: Resistor Simulator Schematic Diagram
Circuit Module Physical Construction www.ti.com Figure 25. Resistor Simulator Schematic Diagram SLUU854 – February 2012 bq77908AEVM Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... - Page 39 Any exceptions to this is strictly prohibited and unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory authorities, which is responsibility of user including its acceptable authorization.
- Page 40 REGULATORY COMPLIANCE INFORMATION (continued) FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
- Page 41 Japan with respect to this product. Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan. Texas Instruments Japan Limited (address) 24-1, Nishi-Shinjuku 6 chome, Shinjukku-ku, Tokyo, Japan http://www.tij.co.jp 【ご使用にあたっての注】...
- Page 42 FDA Class III or similar classification, then you must specifically notify TI of such intent and enter into a separate Assurance and Indemnity Agreement. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2012, Texas Instruments Incorporated...
- Page 43 Any exceptions to this are strictly prohibited and unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory authorities, which is responsibility of user including its acceptable authorization.
- Page 44 FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
- Page 45 Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan. Texas Instruments Japan Limited (address) 24-1, Nishi-Shinjuku 6 chome, Shinjuku-ku, Tokyo, Japan http://www.tij.co.jp...
- Page 46 FDA Class III or similar classification, then you must specifically notify TI of such intent and enter into a separate Assurance and Indemnity Agreement. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2012, Texas Instruments Incorporated...
- Page 47 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.
Need help?
Do you have a question about the bq77908AEVM and is the answer not in the manual?
Questions and answers