BQ20Z80EVM-001

User's Guide SLUU205B – October 2004 – Revised October 2013 bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module This EVM is a complete evaluation system for the bq20z80/bq29312/bq29401 battery management system. The EVM includes one bq20z80/bq29312/bq29401 circuit module, a current sense resistor, two thermistors, and Windows®-based PC software. The circuit module includes one bq20z80 IC, one bq29312 IC, one bq29401 IC, and all other onboard components necessary to monitor and predict capacity, perform cell balancing, monitor critical parameters, protect the cells from overcharge, over discharge, short circuit, and overcurrent in 2-, 3- or 4-series cell Li-ion or Li-polymer battery packs. The circuit module connects directly across the cells in a battery. An EV2300 board for gas gauge interface is required to interface this EVM with the PC and can be purchased separately. With the EV2300 interface board and software, the user can read the bq20z80 data registers, program the chipset for different pack configurations, log cycling data for further evaluation, and evaluate the overall functionality of the bq20z80/bq29312/bq29401 solution under different charge and discharge conditions. 1 2 3 4 5 6 7 8 9 10 Contents Features ...................................................................................................................... 2 bq20z80/bq29312-Based Circuit Module ................................................................................ 2 bq20z80/bq29312 Circuit Module Schematic ........................................................................... 3 Circuit Module Physical Layouts and Bill of Materials .................................................................. 4 EVM Hardware and Software Setup .................................................................................... 10 Troubleshooting Unexpected Dialog Boxes ............................................................................ 10 Hardware Connection ..................................................................................................... 11 Operation ................................................................................................................... 12 Calibration Screen ......................................................................................................... 15 Pro (Advanced) Screen ................................................................................................... 17 List of Figures 1 bq20z80EVM-001 Layout (Silk Screen) .................................................................................. 2 Top Assembly ............................................................................................................... 4 3 Layer 1 ....................................................................................................................... Layer 2 (Internal 1) ......................................................................................................... Layer 3 (Internal 2) ......................................................................................................... Layer 4 ....................................................................................................................... Mask (Layer 1) .............................................................................................................. Mask (Layer 4) .............................................................................................................. Bottom Assembly ........................................................................................................... bq20z80bq29312 Circuit Module Connection to Cells and System Load/Charger ............................... SBS Data Screen .......................................................................................................... Data Flash Screen, 1st Level Safety Class ............................................................................ Calibration Screen ......................................................................................................... Pro (Advanced) Screen ................................................................................................... 4 4 5 6 7 8 9 10 11 12 13 14 4 5 5 5 5 6 6 11 12 13 16 17 List of Tables 1 Ordering Information ........................................................................................................ 2 Impedance Track is a trademark of Texas Instruments. Windows is a registered trademark of Microsoft Corporation. SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module Copyright © 2004–2013, Texas Instruments Incorporated 1 Features 1 2 Components and Flash-Memory Settings for Different Precharge Modes .......................................... 3 Bill of Materials .............................................................................................................. 7 4 Performance Specification Summary ................................................................................... 10 5 Circuit Module to EV2300 Connections ................................................................................ 11 • • • Complete evaluation system for the bq20z80 SBS 1.1-compliant advanced gas gauge with Impedance Track Technology, bq29312 analog front end (AFE) and protection IC, and bq29401 independent overvoltage protection IC Populated circuit module for quick setup PC software and interface board for easy evaluation Software that allows data logging for system analysis Kit Contents • • • 1.2 3 Features • 1.1 www.ti.com bq20z80/bq29312/bq29401 circuit module Software CD with the evaluation software Set of support documentation Ordering Information Table 1. Ordering Information 2 EVM PART NUMBER CHEMISTRY CONFIGURATION CAPACITY bq20z80EVM-001 Li-ion 2, 3, or 4 cell Any bq20z80/bq29312-Based Circuit Module The bq20z80/bq29312/bq29401-based circuit module is a complete and compact example solution of a bq20z80 and bq29312 circuit for battery management and protection of Li-ion or Li-polymer packs. The circuit module incorporates a bq20z80 battery monitor IC, bq29312 AFE and protection IC, bq29401 independent overvoltage protection IC, and all other components necessary to accurately predict the capacity of 2-, 3-, or 4-series cells. 2.1 Circuit Module Connections Contacts on the circuit module provide the following connections: • Direct connection to the cells: 1N (BAT-), 1P, 2P, 3P, 4P (BAT+) • To the serial communications port (SMBC, SMBD) • The system load and charger connect across PACK+ and PACK• To the system present pin (SYS PRES) • To the sleep pin (SLEEP) 2 bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated bq20z80/bq29312 Circuit Module Schematic www.ti.com 2.2 Pin Descriptions PIN NAME 1N 1P 2P 3P 4P SMBC SMBD SYS PRES SLEEP PACKVSS PACK+ 3 DESCRIPTION -ve connection of first (bottom) cell +ve connection of first (bottom) cell +ve connection of second cell +ve connection of third cell +ve connection of fourth (top) cell Serial communication port clock Serial communication data port System present pin (if low, system is present) Sleep mode pin (if high, AFE enters sleep mode) Pack negative terminal Pack negative terminal Pack positive terminal bq20z80/bq29312 Circuit Module Schematic This section contains information for modifying and choosing a precharge mode for bq20z80/bq29312/bq29401 implementation. 3.1 Schematic The schematic follows the Bill of Materials in this user's guide. 3.2 Modifications for Choosing Particular Precharge Mode In order to charge, the charge FET (CHG-FET) must be turned on to create a current path. When the V(BAT) is 0 V and CHG-FET = ON, the V(PACK) is as low as the battery voltage. In this case, the supply voltage for the device is too low to operate. This function has three possible configurations, and the bq29312 can be easily configured according to the application needs. The three modes are 0-V Charge FET mode, Common FET mode, and Precharge FET mode. 1. 0-V Charge FET mode - Dedicates a precharge current path using an additional FET (ZVCHG-FET) to sustain the PACK+ voltage level. 2. Common FET mode - Does not use a dedicated precharge FET. The charge FET (CHG-FET) is set to ON state as default. 3. Precharge FET mode - Dedicates a precharge current path using an additional open-drain (OD) pin drive FET (PCHG-FET) FET to sustain the PACK+ voltage level. To use a particular mode of charging with the EVM, add or remove some elements shown in Table 2, and use the given settings of DF.Configuration, ZVCHG1, 0. Table 2. Components and Flash-Memory Settings for Different Precharge Modes MODE RESISTORS FET ZVCHG1 ZVCHG0 1(default) R19, R24 Q3, SI4435DY 0 0 2 R17 – 0 1 3 R19, R29 Q3, open-drain FET 1 0 For more details about precharge operation and mode choices, see the bq29312 data sheet (SLUS542). 3.3 Testing Fuse-Blowing Circuit To prevent the loss of board functionality during the fuse-blowing test, the actual chemical fuse is not provided in the circuit. FET Q4 drives TP4 low if a fuse-blow condition occurs; so, monitoring TP4 can be used to test this condition. Fuse placement on the application board is shown in the bq20z80 data sheet reference-board schematic. SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module Copyright © 2004–2013, Texas Instruments Incorporated 3 Circuit Module Physical Layouts and Bill of Materials 4 www.ti.com Circuit Module Physical Layouts and Bill of Materials This section contains the board layout, bill of materials, and assembly drawings for the bq20z80/ bq29312/ bq29401 circuit module. 4.1 Board Layout This section shows the dimensions, PCB layers, and assembly drawing for the bq20z80/bq29312 module. Figure 1. bq20z80EVM-001 Layout (Silk Screen) Figure 2. Top Assembly Figure 3. Layer 1 4 bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Circuit Module Physical Layouts and Bill of Materials www.ti.com Figure 4. Layer 2 (Internal 1) Figure 5. Layer 3 (Internal 2) LAYER 4 Figure 6. Layer 4 Figure 7. Mask (Layer 1) SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module Copyright © 2004–2013, Texas Instruments Incorporated 5 Circuit Module Physical Layouts and Bill of Materials www.ti.com MASK 4 Figure 8. Mask (Layer 4) Figure 9. Bottom Assembly 6 bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Circuit Module Physical Layouts and Bill of Materials www.ti.com 4.2 Bill of Materials Table 3. Bill of Materials Count Ref Des Description Size MFG Part No. C1, C2, C3, C4, C5, C6, C7, C8, C9, C11, C12, C13, C14, C16, C17, C18, C19, C21 Capacitor, ceramic, 0.1 μF 50 V, X7R, 20% 603 Any STD C10 Capacitor, ceramic, 1.0 μF, 50 V, X7R, 20% 1206 Any STD C36 Capacitor, ceramic, 0.1 μF, 16 V, X7R, 10% 603 Any STD C15 Capacitor, ceramic, 0.047 μF, 50 V, X7R, 10% 603 Any STD C20 Capacitor, ceramic, 4.7 μF, 16 V, X7R, 10% 1206 Any STD C19, C22, C24, C28, C29 Capacitor, ceramic, 0.47 μF, 16 V, X7R, 10% 603 Any STD C26 Capacitor, ceramic, 2200 pF, 16 V, COG, 10% 603 Any STD C27 Capacitor, ceramic, 150 pF, 16 V, COG, 10% 603 Any STD 2 D1, D6 Diode, dual, Zener, 5.6 V, 300 mW SOT23 Vishay-Telefunken AZ23C5V6 1 D2 Diode, dual ultra fast, series, 200 mA, 70 V SOT23 Fairchild BAV99 5 D3, D5, D7, D8, D9 Diode, LED, green, Gullwing, GW type, 20 mA, 7.5 mcd Typ Gullwing Panasonic LN1361C 1 D4 Diode, dual Schottky, 200 mA, 30 V SOT23 Vishay-Liteon BAT54C 1 D10 Diode, Schottky SOT23 Vishay-Liteon BAT54C J1 Header, friction lock assembly, 4-pin right angle 0.400 × 0.500 Molex 22-05-3041 3 Q1, Q2, Q3 MOSFET, P-ch, 30 V, 8.0 A, 20 mΩ SO8 Vishay-Siliconix Si4435DY 2 Q4, Q6 MOSFET, N-ch, 60 V, 115 mA, 1.2 Ω SOT23 Vishay-Liteon 2N7002DICT 1 Q5 MOSFET, P-ch, 50 V, 130 mA, 10 Ω SOT23 Vishay BSS84 16 R1, R2, R3, R8, R9, R10, R13, R14, R15, R25, R26, R30, R37, R38, R44, R45 Resistor, chip, 100 Ω, 1/16 W, 5% 603 STD STD 0 R29 Resistor, chip, 4.99 kΩ, 1/16 W, 1% 603 STD STD 5 R11, R12, R22, R24, R28 Resistor, chip, 4.99 kΩ, 1/16 W, 1% 603 STD STD 0 R17 Resistor, chip, 100 kΩ, 1/16 W, 5% 603 STD STD 7 R16, R19, R31, R33, R34, R39, R42 Resistor, chip, 100 kΩ, 1/16 W, 5% 603 STD STD 1 R18 Resistor, chip, 300 Ω, 1 W, 1% 2512 1 R20 Resistor, chip, 0.020 Ω, 1 W, 1% 2512 5 R21, R23, R27, R50, R51 Resistor, chip, 1 MΩ, 1/16 W, 5% 603 1 R32 Resistor, chip, 10 Ω, 1/16 W, 5% Resistor, chip, 100 kΩ, 1/16 W, 0.2%, 75 PPM 18 1 0 1 1 5 1 1 1 1 (1) R35** (1) RCW-2512-301-F Vishay WSL-2512-0 603 STD STD 603 Vishay TNPW06031003BT9RT1 5 R36, R40, R43, R46, R48 Resistor, chip, 470 Ω, 1/16 W, 5% 603 STD STD 4 R4, R5, R6, R7 Resistor, chip, 1 kΩ, 1/16 W, 5% 603 STD STD 2 R41, R47 Resistor, chip, 61.9 kΩ, 1/16 W, 1% 603 STD STD 2 R49, R53 Resistor, chip, 8.45 kΩ, 1.16 W, 1% 603 STD STD 2 RT1, RT2 Thermistor, 10 kΩ 0.095 × 0.150 Sematec NTC103AT-2 Reference designators marked with an asterisk (**) cannot be substituted. All other components can be substituted with equivalent MFG's components. SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module Copyright © 2004–2013, Texas Instruments Incorporated 7 Circuit Module Physical Layouts and Bill of Materials www.ti.com Table 3. Bill of Materials (continued) Count Ref Des Description Size MFG Part No. SW1 Switch, push button, momentary, N.O. low profile 5 mm × 5 mm Panasonic EVQ-PLHA15 2 TB1, TB2 Terminal block, 3 pin, 6 A, 3,5 mm 0.41 × 0.25 OST ED1515 2 TB3, TB4 Terminal block, 2 pin, 6 A, 3,5 mm 0.27 × 0.25 OST ED1514 3 TP1, TP4, TP5 Test point, cir Farnell 240-333 U1 IC, voltage protection for 2, 3, or 4 cell LiIon, 2nd protection, x.xx TSSOP-08 TI bq29400PW (2) (3) (4) U2 IC, 2, 3, or 4 cell series protection control AFE TSSOP24 TI bq29312PW (2) (3) (4) 1 U3 IC, advanced gas gauge TSSOP38 TI bq20z80DBT (2) 1 — PCB Any HPA059 1 1 1 (3) (4) Connector (5) 2 J5 mate Connector, Female, 0.100 centers Molex 22-01-3407 8 N/A Terminals, crimp, tin Molex 08-50-0114 N/A Wire, insulated 24 awg. red, 18 inches (±3 inches) (USB_5V) Alpha 1854-3 N/A Wire, insulated 24 awg. white, 18 inches (±3 inches) (SCL) Alpha 1854-1 N/A Wire, insulated 24 awg. black, 18 inches (±3 inches) (GND) Alpha 1854-2 N/A Wire, insulated 24 awg. brown, 18 inches (±3 inches) (SDA) Alpha 1854-7 N/A Heatshrink, 1 inch Any Any 1 (2) (3) (4) (5) 8 This assembly is ESD sensitive. This assembly must be clean and free from flux and all contaminants. Use of no clean flux is not acceptable. This assembly must comply with workmanship standards IPC-A-610 Class 2. Make one SMBus connector wire assembly for each assembly produced, from J5 mate, 4-24 awg wires, and crimp terminals. Wire colors for pin numbers are listed below. The wire assembly shall have a J5 mate on each end. • Red - Pin #4 (Signal USB_5V) • Brown - Pin #3 (Signal Data) • White - Pin #2 (Signal Clock) • Black - Pin #1 (GND) bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Circuit Module Physical Layouts and Bill of Materials www.ti.com 2 1 21 DSG 20 ZVCHG CHG BAT PACK 19 3 4 5 6 7 23 SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback SLEEP REG TOUT U2 VC1 OD bq29312PW 22 18 17 24 VC2 SCLK 13 VC3 SDATA VC4 XALERT VC5 WDI CELL PMS SR1 SR2 8 9 14 16 10 11 GND GND 15 12 bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module Copyright © 2004–2013, Texas Instruments Incorporated 9 EVM Hardware and Software Setup 4.3 www.ti.com bq20z80/bq29312/bq29401 Circuit Module Performance Specification Summary Table 4 summarizes the performance specifications of the bq20z80/ bq29312/bq29401 circuit module. Table 4. Performance Specification Summary Specification Min Input voltage Pack+ to Pack- Typ 6 Charge and discharge current (1) 5 Max See Units 25 V (1) A Maximum currents are determined by the value of the sense resistor used and the short-circuit threshold setting of the bq29312. It is important to operate this EVM within the input voltage range of 6 V and 25 V, with a maximum voltage drop across the sense resistor of +2150 mV (1-W power dissipation). EVM Hardware and Software Setup This section describes how to install the bq20z80EVM-001 PC software, and how to connect the different components of the EVM. 5.1 System Requirements The bq20z80EVSW requires Windows 2000 or Windows XP. Drivers for Windows 98SE are provided, but Microsoft no longer supports Windows 98; and there may be issues in Windows 98 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 bq20z80 tool folder on power.ti.com. Use the following steps to install the bq20z80EVSW software: 1. Copy the files from the CD into the temporary directory you selected, open the archive TI USB DRVRS.zip, and extract its contents in a subdirectory/drivers. Choose preserve directory structure option when extracting. Alternatively, run SETUP.EXE from the same directory. 2. Plug the EV2300 into a USB port. 3. Wait until system prompt new hardware found appears. Choose select location manually, and use the browse button to point to subdirectory TIUSBWin2K-XP-1. 4. Answer continue to the warning that drivers are not certified with Microsoft. 5. After installation finishes, another system prompt new hardware found appears. Repeat procedure above, but point to subdirectory TIUSBWin2K-XP-2 6. Answer continue to the warning that drivers are not certified with Microsoft. Installation of drivers is now finished. 7. For Windows 98, point to directory TIUSBWin98. 8. Return to the temporary directory where you extracted files; double-click on the Setup.exe icon to install EV Software. If files were downloaded from the Web: 1. Open the archive containing the installation package, and copy its contents in a temporary directory. 2. Follow the preceding steps 1 - 8. 6 Troubleshooting Unexpected Dialog Boxes Ensure that the files were extracted from the zip file using the Preserve Folder names option. Ensure that ALL the files were extracted from the zip file. The user that is downloading the files must be logged in as the administrator. The driver is not signed, so the administrator must allow installation of unsigned drivers in the operating system policy. 10 bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Hardware Connection www.ti.com 7 Hardware Connection The bq20z80EVM-001 comprises three hardware components: the bq20z80/bq29312/bq29401 circuit module, the EV2300 PC interface board (purchased separately), and the PC. 7.1 Connecting the bq20z80/bq29312/bq29401 Circuit Module to a Battery Pack Figure 10 shows how to connect the bq20z80/bq29312/bq29401 circuit module to the cells and system load/charger. The cells should be connected in the following order: 1. 4-Cell Pack: 1N (BAT-), 1P, and 2P (see Section 2.1 for definitions). 2. 3-Cell Pack: 1N (BAT-), 1P, 2P, and then connect 4P and 3P together. 3. 2-Cell Pack: 1N (BAT-), 1P, and then connect 4P, 3P, and 2P together To start charge or discharge test, connect PRES pin to PACK- pin to set SYS PRES state. To test sleep mode, disconnect the PRES pin. Load/Charger EV2300 + − SMBD SMBC VSS + − HPA059 Figure 10. bq20z80bq29312 Circuit Module Connection to Cells and System Load/Charger 7.2 PC Interface Connection The following steps configure the hardware for interface to the PC: 1. Connect the bq20z80/bq29312-based smart battery to the EV2300 using wire leads as shown in Table 5. Table 5. Circuit Module to EV2300 Connections bq20z80/bq29312-Based Battery EV2300 SMBD SMBD SMBC SMBC VSS GND 2. Connect the PC USB cable to the EV2300 and the PC USB port. The bq20z80EVM-001 is now set up for operation. SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module Copyright © 2004–2013, Texas Instruments Incorporated 11 Operation 8 www.ti.com Operation This section details the operation of the bq20z80 EVSW software. 8.1 Starting the Program Run bq20z80 EVSW from the Start | Programs | Texas Instruments | bq20z80 EVSW menu sequence. The SBS Data screen appears. Data begins to appear once the (single time scan) button is clicked, or when the check box is checked. To disable the scan feature, deselect . The continuous scanning period can be set via the |Options| and |Set Scan Interval| menu selections. The range for this interval is 0 ms to 65535 ms. Only items that are selected for scanning are scanned within this period. The bq20z80 EVSW provides a logging function which logs the values that were last scanned by EVSW. To enable this function, select the Start Logging button, this causes the Keep Scanning button to be selected. When logging is Stopped, the keep scanning button is still selected and has to be manually unchecked. The logging interval are specified under the |Options| menu with the maximum value of 65535 milliseconds. The Log interval cannot be smaller than scan interval because this results in the same value being logged at least twice. Figure 11. SBS Data Screen 12 bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Operation www.ti.com This screen shows the SBS data set along with additional ManufacturersAccess() command information such as individual cell measurements. Additional Flag and Static data can be viewed by selecting the appropriate tab at the bottom of the SBS screen. Data such as SBS.ManufacturerName( ) is static and does not change. This data is viewed separately using the Static Data tab available at the bottom of the screen. Dragging the splitter bar (line that separates the Flags/Static data from SBS values) changes the height of the Flags/Static Data display. Selecting |View| then |Auto Arrange| returns the splitter bar to its original location. 8.2 Setting Programmable bq20z80 and bq29312 Options The bq20z80 data flash comes configured per the default settings detailed in the bq20z80 data sheet. Ensure that the settings are correctly changed to match the pack and application for the bq20z80/bq29312 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 12. Data Flash Screen, 1st Level Safety Class To read all the data from the bq20z80 data flash, click on menu option | Data Flash | Read All |. To write to a data flash location, click on the desired location, enter the data and press , which writes the entire tab of flash data, or select menu option |Data Flash|Write All|. The data flash MUST be read before any writes are performed to avoid any incorrect data being written to the device. The | File | Special Export | menu options allows the data flash to be exported, but it configures the exported data flash to a learned state ready for mass production use. SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module Copyright © 2004–2013, Texas Instruments Incorporated 13 Operation www.ti.com The data flash configuration can be saved to a file by selecting | File | Export |, and entering a file name. A data flash file can also be retrieved in this way, imported, and written to the bq20z80 using the | Write All | button. The configuration information of the bq29312 and module calibration data is also held in the bq20z80 data flash. The bq20z80 allows for an automatic data flash export function, similar to the SBS Data logging function. This feature, when selected via | Options | Auto Export |, exports Data Flash to a sequential series of files named as FilenameNNNNN.gg where N = a decimal number from 0 to 9. The AutoExport interval is set under the | Options menu | with a minimum value of 15 seconds. The AutoExport filename is also set under the | Options menu |. When there is a check next to | AutoExport |, the AutoExport is in progress. The same menu selection is used to turn on / off AutoExport. If the data flash screen is blank, then the bq20z80 that is being used may not be supported by the bqEVSW version that is being used. An upgrade may be required. 14 bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Calibration Screen www.ti.com 9 Calibration Screen 9.1 How to Calibrate Before the bq20z80 is calibrated: • Connect a load to Pack- and Pack+ that draws approximately 2 A and measures discharge current to use the FETs. • Connect a current source to Batt- and Pack- to calibrate without using the FETs. • Measure the pack voltage from Batt+ to Batt- (Total of Cell voltages). • Measure the temperature of the pack. • These steps may or may not be required, depending on the type of calibration being performed. 9.2 To Calibrate the bq20z80 Select the types of calibration to be performed. Enter the measured values for the types selected. If Voltage Calibration is selected, then enter the number of cells on the pack. If Temperature Calibration is selected, then select the sensor that is to be calibrated. If the load is connected between Pack+ and Pack-, then select the Use FETs checkbox. Press the Calibrate Part button. 9.3 Board Offset Calibration This performs the offset calibration for the current offset of the board. Remove load/external voltage and short Pack- to Batt-. Press the CC Board Offset button. 9.4 Pack Voltage Calibration This calibrates the voltage at the AFE Pack pin. Make sure Voltage Calibration has been performed for the pack. If Voltage Calibration is not performed, then Pack Voltage Calibration calibrates incorrectly. Remove load/external voltage applied between Pack+ and Pack-. Press the Pack Voltage button to calibrate. SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module Copyright © 2004–2013, Texas Instruments Incorporated 15 Calibration Screen www.ti.com Figure 13. Calibration Screen 16 bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Pro (Advanced) Screen www.ti.com 10 Pro (Advanced) Screen 10.1 SMB Communication The set of read/write operations over SMBus are not specific to any gas gauge. These are provided as general-purpose communication tools. 10.2 Hex / Decimal Converter These two boxes convert between hex and decimal as soon as values are typed into the boxes. Invalid values may cause erroneous results. When scaling converted hex values to a higher number of bytes, follow these rules: • When unsigned is selected, the left pad contains zeroes. • When signed is selected, the left pad contains zeroes for a positive number, or the left pad contains F for negative numbers. 10.3 Programming Allows for device reprogramming from unencrypted and encrypted files. Figure 14. Pro (Advanced) Screen SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module Copyright © 2004–2013, Texas Instruments Incorporated 17 Pro (Advanced) Screen www.ti.com Related Documentation from Texas Instruments To obtain a copy of any of the following TI document, call the Texas Instruments Literature Response Center at (800) 477-8924 or the Product Information Center (PIC) at (972) 644-5580. When ordering, identify this document by its title and literature number. Updated documents can also be obtained through the TI web site at www.ti.com Data Sheets: Literature Number: bq20z80 SLUS625 bq29312 SLUS546 18 bq20z80EVM-001 SBS1.1 Impedance Track™ Technology Enabled Battery Management Solution Evaluation Module SLUU205B – October 2004 – Revised October 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. 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