BQ27741EVM

User's Guide SLUUAH1 – June 2013 bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module This evaluation module (EVM) is a complete evaluation system for the bq27741-G1. The EVM includes one bq27741 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 gas gauge interface, but must be ordered separately. The circuit module includes one bq27741 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 bq27741 data registers, program the chipset for different pack configurations, log cycling data for further evaluation, and evaluate the overall functionality of the bq27741 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. 1 2 3 4 5 6 7 8 9 10 11 12 Contents Features ...................................................................................................................... 2 bq27741-Based Circuit Module ........................................................................................... 2 Circuit Module Physical Layouts, Bill of Materials, and Schematic ................................................... 3 EVM Hardware and Software Setup ..................................................................................... 8 Troubleshooting Unexpected Dialog Boxes ............................................................................. 8 Hardware Connection ...................................................................................................... 8 Operation ................................................................................................................... 11 Calibrate Screen ........................................................................................................... 14 Firmware Screen .......................................................................................................... 16 Preparing the Mass Production File ..................................................................................... 17 Send HDQ Screen ........................................................................................................ 23 Related Documentation From Texas Instruments ..................................................................... 23 List of Figures 1 bq27741EVM Layout, Silk Screen ........................................................................................ 3 2 Top Assembly ............................................................................................................... 4 3 Top Layer .................................................................................................................... 4 4 Bottom Layer 5 Schematic .................................................................................................................... 7 6 bq27741 Circuit Module Connection to Cell and System Load/Charger 7 GaugeStudio Screen ...................................................................................................... 11 8 DataMemory Screen ...................................................................................................... 12 9 Calibration Screen ......................................................................................................... 14 10 Firmware Screen 11 12 13 14 15 16 ................................................................................................................ ............................................ .......................................................................................................... bqCONFIG Screen ........................................................................................................ Configuration Parameters Screen ....................................................................................... Calibration Averaging Tool Screen ...................................................................................... Chemistry Screen ......................................................................................................... Learning Cycle Screen.................................................................................................... Create Image Files Screen ............................................................................................... SLUUAH1 – June 2013 Submit Documentation Feedback bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated 4 9 16 17 18 19 20 21 22 1 Features www.ti.com List of Tables 1 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 Features • • • • • 1.1 Complete evaluation system for the bq27741 gas 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 Kit Contents • bq27741 circuit module This EVM is used for the evaluation of different bq27741-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 2 EVM Part Number Chemistry Configuration Capacity bq27741EVM Li-Ion 1 cell Any bq27741-Based Circuit Module The bq27741-based circuit module is a complete and compact example solution of a bq27741 circuit for battery management. The circuit module incorporates a bq27741 battery gas 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. I2C is a trademark of NXP B.V Corporation. 2 bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated SLUUAH1 – June 2013 Submit Documentation Feedback Circuit Module Physical Layouts, Bill of Materials, and Schematic www.ti.com 2.2 Pin Descriptions Pin Name PACK+ PACK– CELL+ CELL– TERM SDA SCL HDQ VSS 3 Description Pack positive terminal Pack negative terminal Cell positive terminal Cell negative terminal Thermistor input that leads to IC TS pin I2C communication data line I2C communication clock line Single-wire communication line Signal return for communication line 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 bq27741 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 bq27741 module. RT2 C5 R3 RT1 HDQ J11 Q3 TB2 HDQ Q1 THERM R2 J6 FET BYPASS PACK+/ LOAD+ Q4 J13 J12 TP9 TP10 J5 LOAD- DSG TP7 CHG TP3 VPWR C1 C7 R1 TP4 U1C3 RA0 TP5 Q2 TP11 BAT C2 R13 R5 R11 C6 TS C8 TP8 J15 VSS R14R15 C4 R6 R7 D2 J14 J7 VSS SCL SDA TP6 REG25 D1 Ext. CELL + PWR231 Rev. A bq27741EVM VSS Ext. CELL+ CELLTEXAS INSTRUMENTS J10 R9 1 CELLTP1 R8 R10 R4 AUX TEMP 1 TB1 HDQ PULLUP INT. 1.8V Pull up 1 CELL+ TP2 J8 J2 J3 R18 J9 1 J4 J1 PACK-/ LOADPACK-/ Figure 1. bq27741EVM Layout, Silk Screen SLUUAH1 – June 2013 Submit Documentation Feedback bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated 3 Circuit Module Physical Layouts, Bill of Materials, and Schematic www.ti.com Figure 2. Top Assembly Figure 3. Top Layer Figure 4. Bottom Layer 4 bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated SLUUAH1 – June 2013 Submit Documentation Feedback Circuit Module Physical Layouts, Bill of Materials, and Schematic www.ti.com 3.2 Bill of Materials and Schematic Table 2. Bill of Materials Count Reference Designator Value 6 C1, C2, C5, C6, C7, C8 0.1 µF 1 C3 1 µF 1 C4 2 Description Size Part Number MFR Capacitor, Ceramic, 10 V, X5R, 10% 0402 GRM155R61A104KA01D Murata Capacitor, Ceramic, 6.3 V, X5R, 10% 0402 GRM155R60J105KE19D Murata 0.47 µF Capacitor, Ceramic, 0.47 µF, 6.3 V, X5R, 10% 0402 GRM155R60J474KE19D Murata D1, D2 AZ23C5V6-7 Diode, Dual, Zener, 5.6 V, 300 mW SOT23 AZ23C5V6-7-F Diodes 1 J1 ED555/2DS Terminal Block, 2-pin, 6-A, 3.5 mm 0.27 x 0.25 inch ED555/2DS OST 9 J2, J3, J4, J6, J11, J12, J13, J14, J15 PEC03SAAN Header, Male 3-pin, 100mil 0.100 inch x spacing 3 PEC03SAAN Sullins 3 J5, J7, J9 PEC02SAAN Header, Male 2-pin, 100mil 0.100 inch x spacing 2 PEC02SAAN Sullins 2 J8, J10 22-05-3041 1 Q1 0 Q2, Q3, Q4 2 1 Header, Friction Lock Ass'y, 4-pin Right Angle, 0.400 x 0.500 22-05-3041 Molex UPA2375T1P-E1A MOSFET, Dual N-Channel NexFET, 12 V 3.2 A WSCP UPA2375T1P-E1-A Renesas Electronics America DNP MOSFET, Dual N-Channel NexFET, 12 V 3.2 A WSCP UPA2375T1P-E1-A Renesas Electronics America R1, R3 200 Ω Resistor, Chip, 1/16-W, 5% 0402 CRCW0402200RJNED Vishay Dale R12 4.7 kΩ Resistor, Chip, 1/16-W, 5% 0402 CRCW04024K70JNED Vishay Dale 1 R13 2 kΩ Resistor, Chip, 1/16-W, 5% 0402 CRCW04022K00JNED Vishay Dale 2 R14, R15 10 kΩ Resistor, Chip, 1/16-W, 5% 0402 CRCW040210K0JNED Vishay Dale 2 R16, R17 10 Ω Resistor, Chip, 1/16-W, 5% 0402 CRCW040210R0JNED Vishay Dale 1 R2 5 mΩ Res, Metal Current sense, 1W, ±1%, 50 ppm 1632 MCS1632R005FER Ohmite 6 R4, R6, R7, R8, R9 R10 100 Ω Resistor, Chip, 1/16-W, 5% 0402 CRCW0402100RJNED Vishay Dale 2 R5, R11 1 kΩ Resistor, Chip, 1/16-W, 5% 0402 CRCW04021K00JNED Vishay Dale 2 RT1, RT2 10 kΩ Thermistor, 10 kΩ 0.095 x 0.150 inch 103AT-2 Semitec 1 TB1 ED1515 Terminal Block, 3-pin, 6-A, 3.5 mm 0.41 x 0.25 inch ED555/3DS OST 1 TB2 ED555/4DS Terminal Block, 4-pin, 6-A, 3.5 mm 0.55 x 0.25 inch ED555/4DS OST 7 TP1, TP4, TP5, TP7, TP8, TP10, TP11 5001 Test Point, Black, Thru Hole Color Keyed 0.100 x 0.100 inch 5001 Keystone 4 TP2, TP3, TP6, TP9 5000 Test Point, Red, Thru Hole Color Keyed 0.100 x 0.100 inch 5000 Keystone 1 U1 bq27741YZFR-G1 IC, Single Cell Li-Ion Pack Side Fuel Gauge with Integrated Protection BGA-15 bq27741YZFR-G1 TI 1 -- PCB PWR231 Any SLUUAH1 – June 2013 Submit Documentation Feedback bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated 5 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) Ref designators marked with an asterisk ('**') cannot be substituted. All other components can be substituted with equivalent manufacturer's components. 6 bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated SLUUAH1 – June 2013 Submit Documentation Feedback Circuit Module Physical Layouts, Bill of Materials, and Schematic www.ti.com Figure 5. Schematic SLUUAH1 – June 2013 Submit Documentation Feedback bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated 7 EVM Hardware and Software Setup 3.3 www.ti.com bq27741 Circuit Module Performance Specification Summary This section summarizes the performance specifications of the bq27741 circuit module. Table 3. Performance Specification Summary Specification 4 Min Typ Max Unit Input voltage Pack+ to Pack– 2.7 3.6 4.35 V Charge and discharge current 0 1 2 A EVM Hardware and Software Setup This section describes how to install the bq27741EVM PC software, and how to connect the different components of the EVM. 4.1 System Requirements The GaugeStudio 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, but no assurance is made for problem-free operation with specific system configurations. EV2300 is not officially supported for 64-bit versions of Windows and typically does not work with Windows 7 or newer. EV2400 is the recommended USB-I2C interface for Windows 7 and other 64-bit versions. 4.2 Software Installation Find the latest software version in the bq27741 tool folder on power.ti.com. Make a search by Part Number for bq27741 to access the tool folder. Currently the most recent firmware version is bq27741-G1. Use the following steps to install the bq27741 GaugeStudio software: 1. Ensure that the EV2300 or EV2400 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 to the computer using the USB cable. 6. If EV2300 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 is connected, after the previous installation finishes, another system prompt New Hardware Found appears. Repeat steps through , 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, 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. 6 Hardware Connection The bq27741EVM-001 comprises three hardware components: • bq27741 circuit module • EV2300 PC interface board 8 bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated SLUUAH1 – June 2013 Submit Documentation Feedback Hardware Connection www.ti.com • . 6.1 PC Connecting the bq27741 Circuit Module to a Battery Cell SMB I2C HDQ Figure 6 shows how to connect the bq27741 circuit module to the cell and system load/charger. USB EV2300 C2 RT2 R1 TP4 VPWR C1 C7 R13 R5 R11 C6 TP3 DSG TP7 CHG C5 R3 RT1 Q4 J13 J12 HDQ Q3 TB2 Load J11 Charger HDQ Q1 THERM R2 J6 FET BYPASS PACK+/ LOAD+ Q2 TP11 BAT TP9 TP10 J5 LOAD- TP5 J15 VSS R14R15 RA0 U1C3 TS C8 TP8 C4 R6 R7 D2 J14 J7 VSS SCL SDA TP6 REG25 D1 Ext. CELL + PWR231 Rev. A bq27741EVM VSS Ext. CELL+ CELLTEXAS INSTRUMENTS CELLTP1 J10 R9 1 TB1 R8 R10 R4 AUX TEMP 1 Power Supply 3.6V HDQ PULLUP INT. 1.8V Pull up 1 CELL+ TP2 J9 J8 J2 J3 R18 1 J4 J1 PACK-/ LOADPACK-/ bq27741 EVM Figure 6. bq27741 Circuit Module Connection to Cell and System Load/Charger 6.2 PC Interface Connection The bq27741 can be configured as an HDQ communication device or left in default as an I2C™ device. Once the bq27741 is configured for HDQ communication, it cannot be reverted to I2C mode. See Section 11 for information on configuring the bq27741 to HDQ mode. The following steps configure the hardware for interfacing to the PC: 1. Connect the bq27741-based EVM to the EV2300 using wire leads as shown in Table 4 and Table 5. SLUUAH1 – June 2013 Submit Documentation Feedback bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated 9 Hardware Connection www.ti.com 2 Table 4. Circuit Module to EV2300 Connections – I C bq27741-Based Battery (I2C Mode) EV2300 (I2C Port) SDA SDA SCL SCL VSS GND Table 5. Circuit Module to EV2300 Connections – HDQ bq27741-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 and the PC USB port. The bq27741EVM is now set up for operation. 10 bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated SLUUAH1 – June 2013 Submit Documentation Feedback Operation www.ti.com 7 Operation This section details the operation of the GaugeStudio software. 7.1 Starting the Program Run GaugeStudio from the Start → Programs → Texas Instruments → GaugeStudio menu sequence. The main GaugeStudio window (see Figure 7) appears. The window consists of a tools panel at the top, and other child windows that can be hidden, docked in various positions or allowed to float as separate windows. When GaugeStudio first starts up the Gauge Dashboard window, the Registers window, and DataMemory window should be seen in the main window. Registers, DataMemory, Commands, and other windows can be added to the main window by clicking on the corresponding icon in the tools panel at the top of the main window. Data should appear initially in the Gauge Dashboard, Registers, and DataMemory sections. The Refresh (single-time scan) or the Scan (continuous scan) buttons can be clicked to update the data in the Registers and DataMemory windows. The continuous scan is enabled when the Scan checkbox is highlighted green and disabled when the Scan checkbox is not highlighted. The continuous scanning interval can be set with the stopwatch icon next to the Scan button. When the stopwatch icon is clicked, a drop-down menu appears and the desired scanning interval can be selected. The scan interval value shows up next to the stopwatch icon. Figure 7. GaugeStudio Screen SLUUAH1 – June 2013 Submit Documentation Feedback bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated 11 Operation www.ti.com GaugeStudio provides a logging function which logs selected Data Registers and Data Memory values last received from the bq27741. To enable this function, click the DataLog icon in the Tools panel. The DataLog window will appear below the Registers and DataMemory windows. Registers and DataMemory parameters can be added to the log by clicking on the Add Register and Add DataMemory Parameter drop-down menus in the DataLog window and then selected the desired Registers or DataMemory parameters to be added to the log. After all the desired Registers and DataMemory parameters have been added to the log, click the Play button in order to begin logging. A Stop button will replace the Play button once logging starts, the Stop button can be clicked to stop logging. The log can be saved by clicking on the Save icon and specifying a file name. The logging intervals are specified by the value next to the stopwatch icon in the DataLog window. In order to change the logging intervals, click the stopwatch icon and choose one of the intervals provided in the menu selections that appear. Logging interval values will show up next to the stopwatch icon. Figure 7 shows the main GaugeStudio window. Additional Flag and Status data can be viewed at the bottom of the Registers window. Each window can be resized and docked in various positions within the main GaugeStudio window. Each window can also be pulled out from the main window and allowed its own floating window. Also, the Gauge Dashboard window and all windows that are enabled in the Tools panel in the Communication and Debug sections can be set to autohide. 7.2 Setting Programmable bq27741 Options The bq27741 data flash comes configured per the default settings detailed in the bq27741 data sheet (SLUSBF2). Ensure that the settings are correctly changed to match the pack and application for the bq27741 solution being evaluated. IMPORTANT: The correct setting of these options is essential to get the best performance. The settings can be configured using the DataMemory window seen in the main GaugeStudio window (see Figure 8). Figure 8. DataMemory Screen To read all the data flash from the bq27741, click on the Refresh button in the DataMemory window. 12 bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated SLUUAH1 – June 2013 Submit Documentation Feedback Operation www.ti.com To write to a data flash location, click on the desired location, enter the data in dialog box and click “OK” or hit the Enter key. The data flash must be read before any writes are performed to avoid any incorrect data being written to the device. Reading the data after any writes is also recommended. The data-flash configuration can be saved to a file by clicking the Export button and entering a file name. A data-flash file also can be retrieved in this way by clicking the Import button. The exported file has a .gg extension and can be opened and edited with a text editor. It does not contain all of the data flash. It only contains the public volatile parameters and should not be used for production programming. The .senc, .dfi, .dffs, .bqfs, or .dmi file should be used for production as these contain the entire data flash image, including hidden static parameters such as the battery profile. The module calibration data is also stored in the bq27741 data flash. SLUUAH1 – June 2013 Submit Documentation Feedback bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated 13 Calibrate Screen 8 www.ti.com Calibrate Screen To ensure proper calibration, perform the following steps. These steps may or may not be required, depending on the type of calibration being performed. Only one calibration item can be selected and calibrated at a time. 8.1 To Calibrate the bq27741 Calibrate each item one at a time in the order presented in this document. Select the types of calibration to be performed by clicking the corresponding button (see Figure 9). Enter the measured values for the types selected, if necessary. Then press the “Calibrate” button. After all calibration is complete, close the Calibrate screen. Figure 9. Calibration Screen 8.2 Temperature Calibration • • • • 8.3 Pack Voltage Calibration • • • 14 Select if the temperature sensor to calibrate is the internal or the external. Measure the temperature for PACK. Type the temperature value into Enter measured value. Press the Calibrate button. Measure the voltage across Pack+ and Pack– with a calibrated meter. Type the voltage value in mV into Enter measured value. Press the Calibrate button. bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated SLUUAH1 – June 2013 Submit Documentation Feedback Calibrate Screen www.ti.com 8.4 Coulomb Counter Offset Calibration This performs the internal calibration of the coulomb counter input offset. Press the Calibrate Part as indicated below button. 8.5 Board Offset Calibration This performs the offset calibration for the current offset of the board. It takes approximately 35 seconds to complete. It is expected that no current is flowing through the sense resistor while performing this calibration step. Remove load and short PACK– to LOAD–. Press the “Calibrate” button. Remember to calibrate board offset after coulomb counter calibration. 8.6 Current Calibration • • • • Connect a load to LOAD– and LOAD+ that draws approximately 1 A, or connect a current source to PACK+ and Cell+. Ensure that the Measured Current reported is negative, or else reverse the connections. Measure the current with a calibrated meter, and type the value into Enter measured Current using (–) for current in discharge direction. Press the “Calibrate” button. Disconnect or stop the load current after calibration. SLUUAH1 – June 2013 Submit Documentation Feedback bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated 15 Firmware Screen 9 www.ti.com Firmware Screen Firmware screen is used to save or program a complete flash image from or to the gauge. This is done using a .senc file, which contains the instruction flash image (firmware) and the data flash image. (Figure 10) The bq27741EVM may or may not be shipped with the latest firmware version (currently bq27741-G1 v1.05). Figure 10. Firmware Screen 16 bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated SLUUAH1 – June 2013 Submit Documentation Feedback Preparing the Mass Production File www.ti.com 10 Preparing the Mass Production File BqCONFIG is a tool which allows user to configure the gauge. It is based on Q&A and can help user to generate mass production files step by step. Download the bqCONFIG from the bq27741 tool folder and install. Run GaugeStudio from the Start → Programs → Texas Instruments → bqCONFIG menu sequence. The main GaugeStudio window (Figure 11) appears. All sections of preparing the mass production files are shown as a tools panel at the top. Figure 11. bqCONFIG Screen SLUUAH1 – June 2013 Submit Documentation Feedback bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated 17 Preparing the Mass Production File www.ti.com 10.1 Initial Update and Configuration Parameters Initial Update section can initialize BQ27741 with an existing configuration. It is recommended to update a new version default firmware for a new project. Download the .senc file from the bq27741 tool folder and use “Tools→ Update Device Firmware” menu to program a .senc file into the EVM. Configuration Parameters section allows user to set appropriate parameters for the gauge. All the settings must be programmed based on the cell characteristics, the end-system and charger requirements. Remember the bqCONFIG has two screens in this section (Figure 12), user must check both System Characteristics and Gauging Characteristics before clicking the “Save to Gauge” button. Figure 12. Configuration Parameters Screen 18 bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated SLUUAH1 – June 2013 Submit Documentation Feedback Preparing the Mass Production File www.ti.com 10.2 Calibration Ensure calibration is finished before chemistry test and learning cycle. Calibration section can be finished in the GaugeStudio. However, the bqCONFIG has a Calibration Averaging Tool (Figure 13). This tool can generate an average calibration value to be used in mass production instead of individually calibrating each board. User may calibrate 20 boards or more to have a sufficient sample size and include the average result of the calibration into the mass production file. This tool can be accessed through the Tools menu. It keeps track of the calibration values for each board and determines the average value to be included in the mass production file. Figure 13. Calibration Averaging Tool Screen SLUUAH1 – June 2013 Submit Documentation Feedback bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated 19 Preparing the Mass Production File www.ti.com 10.3 Chemistry This section allows user to select and program the chemistry to match specific cell. TI provides a lot of chemID which contains cell profile to match different cells. 1. Start GaugeStudio or use other equipment to log time, voltage, current, and temperature. Voltage must be measured with better than 1-mV error. 2. Charge cell to the manufacturer specified voltage, until taper current reaches C/100. 3. Wait 2 hrs 4. Discharge at C/10 rate to manufacturer specified termination voltage (use 3 V if unknown) 5. Wait 5 hrs 6. Use chemselect_cont.mcd worksheet to find chemical ID 7. Select the correct chemical ID in bqCONFIG and clicking Update Chemistry button. Figure 14. Chemistry Screen 20 bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated SLUUAH1 – June 2013 Submit Documentation Feedback Preparing the Mass Production File www.ti.com 10.4 Learning Cycle Learning Cycle section (Figure 15) shows the information about how to do a learning cycle. After learning cycle, the gauge will update the capacity and the impedance. The learning cycle need a fully charge and discharge cycle to finish. For detailed instructions on how to perform a learning cycle and troubleshoot common issues, please refer to SLUA587. Figure 15. Learning Cycle Screen SLUUAH1 – June 2013 Submit Documentation Feedback bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated 21 Preparing the Mass Production File www.ti.com 10.5 Create Image Files This section (Figure 16) allows user to export the image files for mass production. Please check every section before create image files has not problems. After creating image files, the details of how to update image files at production, please see SLUA541, Updating bq275xx Firmware at Production. Figure 16. Create Image Files Screen 22 bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated SLUUAH1 – June 2013 Submit Documentation Feedback Send HDQ Screen www.ti.com 11 Send HDQ Screen To configure a bq27741 into HDQ mode, navigate to the Send HDQ screen. It is possible that all the screen options on the left are not visible depending on screen resolution. If needed scroll within the left menu to access the Send HDQ link. Click on the "Change comm to HDQ8" button while having the bq27741 connected to the EV2300 via I2C. Clicking on the button causes a message to appear indicating that the process is not reversible and to confirm if the actions are desired. Also, it explains what to do once the HDQ mode has been activated. Once converting the bq27741 into HDQ mode, it is required that you connect the HDQ terminal of the EV2300 with the HDQ connector (J4) of the bq27741 EVM, then restart the EVSW, and select the "bq27741HDQR1" with the proper firmware version from the list of supported devices within the EVSW. 12 Related Documentation From Texas Instruments To obtain a copy of any of the following TI documents, 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 also can be obtained through the TI Web site at www.ti.com. 1. bq27741-G1, Single Cell Li-Ion Battery Fuel Gauge with Integrated Protection Data Sheet (SLUSBF2) 2. bq27741-G1, Pack-Side Impedance Track™ Battery Fuel Gauge With Integrated Protector and LDO User's Guide (SLUUAA3) SLUUAH1 – June 2013 Submit Documentation Feedback bq27741EVM Single-Cell Impedance Track™ Technology Evaluation Module Copyright © 2013, Texas Instruments Incorporated 23 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 PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does not 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 from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY 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 claims arising 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 all appropriate 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 ANY INDIRECT, 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 or services 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. This notice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/or safety 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, or combination 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 PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be 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 questions concerning 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 operate properly with certain components above 60°C as long as the input and output ranges are maintained. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified using 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. 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