BQ27620EVM

User's Guide SLUU655 – October 2011 bq27620 EVM: Single-Cell Impedance Track Technology This evaluation module (EVM) is a complete evaluation system for the bq27620. The EVM includes one bq27620 circuit module, a current sense resistor, an EV2300 PC interface board for gas gauge interface, a PC USB cable, and Windows™-based PC software. The circuit module includes one bq27620 integrated circuit and all other onboard components necessary to monitor and predict capacity for a system-side fuel gauge solution. The circuit module connects directly across the battery pack. With the EV2300 interface board and software, the user can read the bq27620 data registers, program the chipset for different pack configurations, log cycling data for further evaluation, and evaluate the overall functionality of the bq27620 solution under different charge and discharge conditions. The latest Windows TM – 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 Contents Features ...................................................................................................................... 2 1.1 Kit Contents ......................................................................................................... 2 1.2 Ordering Information ............................................................................................... 2 bq27620-Based Circuit Module ........................................................................................... 3 2.1 Circuit Module Connections ...................................................................................... 3 2.2 Pin Description ..................................................................................................... 3 bq27620 Circuit Module Schematic ...................................................................................... 3 3.1 Schematic ........................................................................................................... 3 Circuits Module Physical Layout and Bill of Material ................................................................... 3 4.1 Board Layout ....................................................................................................... 3 4.2 Bill of Material ...................................................................................................... 6 4.3 Schematic ........................................................................................................... 7 4.4 bq27620 Circuits Module Performance Specification Summary ............................................. 8 EVM Hardware and Software Setup ..................................................................................... 8 5.1 System Requirements ............................................................................................. 8 5.2 Software Installation ............................................................................................... 8 Troubleshooting Unexpected Dialog Boxes ............................................................................. 8 Hardware Connection ...................................................................................................... 8 7.1 Connecting the bq27620 Circuit Module to a Battery Pack .................................................. 8 7.2 PC Interface Connection .......................................................................................... 9 Operation ..................................................................................................................... 9 8.1 Starting the Program .............................................................................................. 9 8.2 Setting Programmable bq27620 Options ...................................................................... 10 Calibrate Screen ........................................................................................................... 12 9.1 To Calibrate the bq27620 ....................................................................................... 12 9.2 Voltage Calibration ............................................................................................... 12 9.3 Temperature Calibration ......................................................................................... 12 I2C Pro Screen ............................................................................................................ 13 10.1 I2C Communication .............................................................................................. 13 Related Documentation from Texas Instruments ..................................................................... 13 List of Figures ...................................................................................... 1 bq27620EVM Layout – Silk Screen 2 bq27620EVM Layout – Top Assembly ................................................................................... 4 3 bq27620EVM Layout – Top Layer ........................................................................................ 5 SLUU655 – October 2011 Submit Documentation Feedback bq27620 EVM: Single-Cell Impedance Track Technology Copyright © 2011, Texas Instruments Incorporated 4 1 Features www.ti.com 4 bq27620EVM Layout – Bottom Layer .................................................................................... 5 5 bq27620EVM Schematic ................................................................................................... 7 6 bq27620 Circuit Module Connection to Pack and System Load/Charger ........................................... 9 7 DataRAM Screen .......................................................................................................... 10 8 Data Flash Screen 9 Calibration Screen ......................................................................................................... 12 10 I2C Pro Screen ........................................................................................................ ............................................................................................................ 11 13 List of Tables 1 1 Ordering Information ........................................................................................................ 2 2 Bill of Materials .............................................................................................................. 6 3 Performance Specification Summary..................................................................................... 8 4 Circuit Module to EV2300/EV2400 Connections........................................................................ 9 Features • • • • • 1.1 Complete evaluation system for the bq27620 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 • bq27620 circuit module (HPA735) This EVM is used for the evaluation of bq27620-based products. Ensure that you visit the product Web folder at www.ti.com to download the latest firmware version for the associated product to be evaluated. 1.2 Ordering Information Table 1. Ordering Information 2 EVM Part Number Chemistry Configuration Capacity bq27620EVM Li-Ion 1 Cell Any bq27620 EVM: Single-Cell Impedance Track Technology Copyright © 2011, Texas Instruments Incorporated SLUU655 – October 2011 Submit Documentation Feedback bq27620-Based Circuit Module www.ti.com 2 bq27620-Based Circuit Module The bq27620-based circuit module is a complete and compact example solution of a bq27620 circuit for battery management. The circuit module incorporates a bq27620 battery gas gauge integrated circuit (IC) and all other components necessary to accurately predict the capacity of 1-series Li-ion cell. 2.1 Circuit Module Connections Contacts on the circuit module provide the following connections: • Direct connection to the battery pack (J2 or J3): PACK+, PACK– • To the serial communications port (J8): SDA, SCL, and VSS • The system load and charger connect across charger and load (J6 and J7): CHARGER–/LOAD– and CHARGER+/LOAD+. • Access to signal outputs (J5): SOC_INT, BAT_LOW and BAT_GD 2.2 Pin Description Pin Name PACK+ PACK– SDA SCL VSS CHG+/LOAD+ CHG–/LOAD– BAT_LOW /BAT_GD SOC_INT Description Pack positive terminal Pack negative terminal I2C™ communication data line I2C communication clock line Signal return for communication line, shared with charger and ground High potential of load or charger connection Low potential of load or charger connection (system VSS) Battery low output Battery good output SOC state interrupts output 3 bq27620 Circuit Module Schematic 3.1 Schematic The schematic follows the bill of materials in this user's guide. 4 Circuits Module Physical Layout and Bill of Material This section contains the board layout, bill of materials, and assembly drawings for the bq27620 circuit module. 4.1 Board Layout This section shows the printed-circuit board (PCB) layers (Figure 1 through Figure 4), and assembly drawing for the bq27620 module. SLUU655 – October 2011 Submit Documentation Feedback bq27620 EVM: Single-Cell Impedance Track Technology Copyright © 2011, Texas Instruments Incorporated 3 Circuits Module Physical Layout and Bill of Material www.ti.com Figure 1. bq27620EVM Layout – Silk Screen Figure 2. bq27620EVM Layout – Top Assembly 4 bq27620 EVM: Single-Cell Impedance Track Technology Copyright © 2011, Texas Instruments Incorporated SLUU655 – October 2011 Submit Documentation Feedback www.ti.com Circuits Module Physical Layout and Bill of Material Figure 3. bq27620EVM Layout – Top Layer Figure 4. bq27620EVM Layout – Bottom Layer SLUU655 – October 2011 Submit Documentation Feedback bq27620 EVM: Single-Cell Impedance Track Technology Copyright © 2011, Texas Instruments Incorporated 5 Circuits Module Physical Layout and Bill of Material 4.2 www.ti.com Bill of Material Table 2. Bill of Materials Count 6 RefDes Value Description Size Part Number 1 C3 33nF Capacitor, Ceramic,10V, X7R, +/-10% 402 GRM155R71A333KA01D Murata 1 C4 1.0uF Capacitor, Ceramic, 6.3V, X5R, 10% 402 GRM155R60J105KE19D 3 C1, C2, C5 0.1uF Capacitor, Ceramic, 10V, X5R, 10% 402 GRM155R61A104KA01D Murata 1 D1 AZ23C5V6-7-F Diode, Dual, Zener, 5.6 V, 300mW SOT23 AZ23C5V6-7-F Diodes 3 J1, J6, J7 ED555/2DS Terminal Block, 2-pin, 6-A, 3.5mm 0.27 x 0.25 inch ED555/2DS OST 2 J2, J5 ED555/4DS Terminal Block, 4-pin, 6-A, 3.5mm 0.55 x 0.25 inch ED555/4DS OST 2 J3, J8 22-05-3041 Header, Friction Lock Ass'y, 4-pin Right Angle, 0.400 x 0.500 22-05-3041 Molex 2 J4, J9 PEC36SAAN Header, Male 3-pin, 100mil spacing 0.100 inch x 3 PEC36SAAN Sullins 1 R1 1.8M Resistor, Chip, 1/16-W, 5% 402 Std Std 2 R11, R12 10k Resistor, Chip, 1/16-W, 5% 402 Std Std 1 R2 18.2k Resistor, Chip, 1/16-W, 1% 402 Std Std 1 R3 1k Resistor, Chip, 1/16-W, 5% 402 Std Std 4 R6, R7, R4, R5 100 Resistor, Chip, 1/16-W, 5% 402 Std Std 3 TP1, TP3, TP6 5000 Test Point, Red, Thru Hole Color Keyed 0.100 x 0.100 inch 5000 Keystone 2 TP2, TP5 5001 Test Point, Black, Thru Hole Color Keyed 0.100 x 0.100 inch 5001 Keystone 1 TP4 5002 Test Point, White, Thru Hole Color Keyed 0.100 x 0.100 inch 5002 Keystone 1 U1 BQ27620YZF IC, System-Side Impedance Track w/ Dynamic Voltage Correlation Fuel Gauge With DSBGA BQ27620YZF TI bq27620 EVM: Single-Cell Impedance Track Technology Copyright © 2011, Texas Instruments Incorporated Mfr Murata SLUU655 – October 2011 Submit Documentation Feedback www.ti.com 4.3 Circuits Module Physical Layout and Bill of Material Schematic Figure 5. bq27620EVM Schematic SLUU655 – October 2011 Submit Documentation Feedback bq27620 EVM: Single-Cell Impedance Track Technology Copyright © 2011, Texas Instruments Incorporated 7 EVM Hardware and Software Setup 4.4 www.ti.com bq27620 Circuits Module Performance Specification Summary This section summarizes the performance specifications of the bq27620 circuit module. Table 3. Performance Specification Summary 5 Specification Min Typ Max Units Input voltage Pack+ to Pack– 2.7 3.6 4.3 V Charge and discharge current 0 1 2 A EVM Hardware and Software Setup This section describes how to install the bq27620EVM PC software and how to connect the different components of the EVM. 5.1 System Requirements The bq27620EVSW software requires Windows 2000 or Windows XP. Drivers for Windows 98SE are provided, but Microsoft™ no longer supports Windows 98; therefore, Windows 98 can 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 bq27620 tool folder on power.ti.com. Make a search by Part Number for bq27620 to access the tool folder. Use the following steps to install the bq27620EVSW 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. After 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. 6 Troubleshooting Unexpected Dialog Boxes 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 bq27620EVM comprises three hardware components: the bq27620 circuit module, the EV2300 PC interface board, and the PC. 7.1 Connecting the bq27620 Circuit Module to a Battery Pack Figure 6 shows how to connect the bq27620 circuit module to the cells and system load/charger. 8 bq27620 EVM: Single-Cell Impedance Track Technology Copyright © 2011, Texas Instruments Incorporated SLUU655 – October 2011 Submit Documentation Feedback Operation USB EV2300 or EV2400 SMB I2C HDQ www.ti.com T Battery Pack LOAD CHARGER Figure 6. bq27620 Circuit Module Connection to Pack and System Load/Charger 7.2 PC Interface Connection The following steps configure the hardware for interface to the PC. 1. Connect the bq27620-based EVM to the EV2300 using wire leads as shown in Table 4. 2. Connect the PC USB cable to the EV2300 and the PC USB port. Table 4. Circuit Module to EV2300/EV2400 Connections bq27620EVM EV2300 SDA SDA SCL SCL VSS GND The bq27620EVM is now set up for operation. 8 Operation This section details the operation of the bq27620 EVSW software. 8.1 Starting the Program Run bq27620 EVSW from the Start | Programs | Texas Instruments | bq Evaluation Software menu sequence. The DataRAM screen (Figure 7) 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 with the | Options | and | Set Scan Interval | menu selections. The range for this interval is 0 ms to 65,535 ms. Only items that are selected for scanning are scanned within this period. SLUU655 – October 2011 Submit Documentation Feedback bq27620 EVM: Single-Cell Impedance Track Technology Copyright © 2011, Texas Instruments Incorporated 9 Operation www.ti.com The bq27620 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 intervals are specified under the | Options | menu with the maximum value of 65,535 ms. The Log interval cannot be smaller than the scan interval because this results in the same value being logged at least twice. Figure 7. DataRAM Screen This screen (Figure 2) shows the RAM data set. Additional Flag and Status data can be viewed at the bottom of the DataRAM screen. Dragging the splitter bar (line that separates the Flags/Status data from Data Ram register values) changes the height of the Flags/Status Data display. Selecting | View |, then | Auto Arrange | returns the splitter bar to its original location. 8.2 Setting Programmable bq27620 Options The bq27620 data flash comes configured per the default settings detailed in the bq27620 data sheet. Ensure that the settings are correctly changed to match the pack and application for the bq27620 solution being evaluated. IMPORTANT: The correct setting of these options is essential to get the best performance. The settings can be configured using the Data Flash screen (Figure 8). 10 bq27620 EVM: Single-Cell Impedance Track Technology Copyright © 2011, Texas Instruments Incorporated SLUU655 – October 2011 Submit Documentation Feedback Operation www.ti.com Figure 8. Data Flash Screen To read all the data from the bq27620 data flash, click on menu option | Data Flash | Read All |. To read all the data from the bq27620 data flash, click on menu option | Data Flash | Read All |. , 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 also can be retrieved in this way, imported, and written to the bq27620 using the | Write All |button. The module calibration data is also held in the bq27620 data flash. The bq27620 allows for an automatic data-flash export function, similar to the DataRAM 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. The AutoExport interval is set under the | Options menu | with a minimum value of 15 s. The AutoExport filename also is set under the | Options menu |. When a check is 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 bq27620 that is being used may not be supported by the bqEVSW version that is being used. An upgrade may be required. SLUU655 – October 2011 Submit Documentation Feedback bq27620 EVM: Single-Cell Impedance Track Technology Copyright © 2011, Texas Instruments Incorporated 11 Calibrate Screen 9 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 once. Figure 9. Calibration Screen 9.1 To Calibrate the bq27620 1. Select the types of calibration to be performed (see Figure 9). 2. Enter the measured values for the types selected. 3. Press the button to calibrate. 9.2 Voltage Calibration 1. Measure the voltage across Pack+ and Pack–. 2. Type the voltage value in mV into Enter Actual Voltage. 3. Press the Calibrate Part as indicated below button. 9.3 Temperature Calibration 1. Measure the temperature for PACK. 2. Type the temperature value into Enter Actual Temperature. 3. Select if the temperature sensor to calibrate is the internal or external. 12 bq27620 EVM: Single-Cell Impedance Track Technology Copyright © 2011, Texas Instruments Incorporated SLUU655 – October 2011 Submit Documentation Feedback I2C Pro Screen www.ti.com 4. Press the Calibrate Voltage and Current as indicated below button. 10 I2C Pro Screen 10.1 I2C Communication The read/write operations of the I2C Pro function are not specific to any gas gauge. These operations serve as general-purpose communication tools (Figure 10). Figure 10. I2C Pro Screen 11 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. bq27620, System-Side Impedance Track™ Dynamic Voltage Correlation Fuel Gauge with Integrated LDO data sheet (SLUSAE3) SLUU655 – October 2011 Submit Documentation Feedback bq27620 EVM: Single-Cell Impedance Track Technology Copyright © 2011, Texas Instruments Incorporated 13 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. 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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 0 V to 5V and the output voltage range of 0 V to 5V . 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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