Texas Instruments bq27x10EVM User manual

User's GuideSLUU259 – October 2006
bq27x10EVM Single-Cell Battery Fuel GaugeEvaluation Module
The bq27x10EVM is a complete evaluation system for the bq27x10 single-cell Li-ionand Li-polymer battery gas gauge device.
Contents1 Introduction .......................................................................................... 22 bq27x10-Based Circuit Module ................................................................... 33 bq27x10EVM Circuit Module Schematic ........................................................ 44 bq27x10EVM Circuit Module Physical Layouts ................................................. 45 bq27x10EVM Circuit Module List of Materials .................................................. 86 bq27x10EVM Circuit Module Performance Specification Summary ......................... 97 EVM Hardware and Software Setup ............................................................ 108 Operation ........................................................................................... 11
List of Figures
1 bq27x10EVM Schematic .......................................................................... 42 bq27x10EVM Topside Assembly ................................................................. 53 bq27x10EVM Silkscreen ........................................................................... 54 bq27x10EVM Layer 1 Layout ..................................................................... 65 bq27x10EVM Layer 2 Layout ..................................................................... 76 bq27x10EVM Layer 3 Layout ..................................................................... 87 bq27x10EVM Layer 4 Layout ..................................................................... 88 bq27x10EVM Circuit Module Connection to Cells and System Load/Charger ............ 109 Initial Register Screen ............................................................................ 1110 EEPROM Screen .................................................................................. 1211 Pro Screen ......................................................................................... 1412 Calibration Screen ................................................................................ 15
List of Tables
1 Ordering Information ............................................................................... 22 Test Points ........................................................................................... 33 List of Materials ..................................................................................... 94 Performance Specification Summary ............................................................ 95 Circuit Module-to-EV2300 Connection ......................................................... 116 Example Data Log ................................................................................ 16
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1 Introduction
1.1 Features
1.2 Kit Contents
1.3 Ordering Information
Introduction
The bq27x10EVM includes one bq27x10EVM circuit module, an EV2300 PC interface board for gasgauge evaluation, a USB cable, CD ROM including Windows™-based PC software and supportdocumentation. The circuit module includes one bq27x10, a current sense resistor, and all othercomponents onboard necessary to calculate remaining battery capacity and predict system run-time toempty. The circuit module connects directly across the cell in a battery. With the PC interface board andsoftware, the user can read the bq27x10 data registers, program the on-chip configuration EEPROM, andevaluate the functions of the bq27x10 under different charge and discharge conditions.
•Complete evaluation system for the bq27x10 battery gas gauge•Populated circuit module for quick setup•PC software and interface board for easy evaluation•Software allows EEPROM programming and data logging for system analysis
1. bq27x10EVM circuit module with sense resistor2. PC interface board (EV2300 for USB interface)3. CD ROM including Windows-based PC software and support documentation4. USB cable5. Set of support documentation
Table 1. Ordering Information
EVM PART NUMBER PC INTERFACE BOARD CHEMISTRY PACK VOLTAGE CAPACITY
bq27x10EVM USB Li-Ion 2.6 v to 4.5 V 100 to 2000 mAh
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2 bq27x10-Based Circuit Module
bq27x10-Based Circuit Module
The bq27x10EVM-based circuit module is an example circuit for battery fuel gauging of a single-cellLi-ion/Li-polymer battery pack. The EVM module has two separate circuits. One is the active bq27x10 fuelgauging circuitry; the other is the logic and power control to program the on-chip configuration EEPROMof the bq27x10. In a typical application, only the active fuel gauging circuitry is required. The EEPROMprogramming circuitry would be required in a test setup to configure the bq27x10 for the application byprogramming the EEPROM.
Contacts on the circuit module provide direct connection to the cell (J1-1, J2-2), and the serialcommunications port (J1-3). The system load and charger connect across J1-1 and J2-1.
Table 2. Test Points
TEST POINT SIGNAL NAME DESCRIPTION
J1-1 PACK+ Cell positive/pack positiveJ1-2 SCL Used only with bq27210 as the I2C Clock lineJ1-3 SDA/HDQ Single-wire HDQ line for bq27010 or I2C Data line forbq27210J2-1 PACK– Pack negativeJ2-2 BAT– Cell negativeJ3-1 21V High voltage for EEPROM programmingJ3-2 PROG Input for timing of EEPROM programming pulseJ3-3 GPIO/ADIN GPIO pin of bq27x10
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3 bq27x10EVM Circuit Module Schematic
4 bq27x10EVM Circuit Module Physical Layouts
bq27x10EVM Circuit Module Schematic
Figure 1. bq27x10EVM Schematic
Figure 2 through Figure 7 show the PCB layers and assembly drawing for the bq27x10EVM circuitmodule.
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bq27x10EVM Circuit Module Physical Layouts
Figure 2. bq27x10EVM Topside Assembly
Figure 3. bq27x10EVM Silkscreen
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bq27x10EVM Circuit Module Physical Layouts
Figure 4. bq27x10EVM Layer 1 Layout
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bq27x10EVM Circuit Module Physical Layouts
Figure 5. bq27x10EVM Layer 2 Layout
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5 bq27x10EVM Circuit Module List of Materials
bq27x10EVM Circuit Module List of Materials
Figure 6. bq27x10EVM Layer 3 Layout
Figure 7. bq27x10EVM Layer 4 Layout
Table 3 contains the list of materials required for the bq27x10EVM circuit module.
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6 bq27x10EVM Circuit Module Performance Specification Summary
bq27x10EVM Circuit Module Performance Specification Summary
Table 3. List of Materials
REF DES 27010 27210 DESCRIPTION MFR PART NUMBER
QTY QTY
C1, C2, 5 5 Capacitor, ceramic, 0.1 µF, 10 V, X5R, 402 Murata GRM155R61A104KA01DC3, C4,C5
D1, D3 2 2 Diode, Zener, 5.6 V, 350 mW, SOT23 Diodes, Inc. BZX84C5V6TD2 1 1 Diode, Dual, Zener, 5.6 V, 300 mW, SOT23 Diodes, Inc. AZ23C5V6Q1 1 1 MOSFET, N-channel, 2N7002, 60 V, 250 mA, 3 Ω, Vishay-Siliconix 2N7002ESOT23Q2 1 1 MOSFET, P-channel, ZVP3306, –60 V, 0.09 A, 14 Ω, Zetex ZVP3306SOT23R1, R2, 3 3 Resistor, chip, 100 Ω, 1/16 W, 5%, 603 Std StdR11
R13, R14, 3 3 Resistor, chip, 1 M Ω, 1/16 W, 5%, 603 Std StdR16
R12 1 1 Resistor, chip, 100 k Ω, 1/16 W, 5%, 603 Std StdR3, R6, 3 3 Resistor, chip, 1 k Ω, 1/16 W, 5%, 402 Std StdR7
R4, R5, 4 4 Resistor, chip, 100 Ω, 1/16 W, 5%, 402 Std StdR9, R10R17, R18 0 2 Resistor, chip, 15 k Ω, 1/16 W, 5%, 603 Std StdR15 1 1 Resisitor, chip, 10k Ω, 1/16 W, 5%, 402 Std StdR8 1 1 Resistor, chip, 0.02 Ω, 0.25 W, 1%, 1206 Vishay WSL1206U1 1 0 Single cell Li-Ion/Polymer gas gauge device, QFN Texas bq27010DRKInstrumentsU1 0 1 Single cell Li-Ion/Polymer gas gauge device, QFN Texas bq27210DRKInstrumentsJ1, J3 2 2 Terminal blocks, 3 position OST ED1515J2 1 1 Terminal blocks, 2 position OST ED1514J4 0 1 Header, 2-pin, 100mil spacing, (36-pin strip) Sullins PTC36SAANN/A 1 1 PCB Any HPA212
Table 4 gives the performance specifications of the bq27x10EVM circuit module.
Table 4. Performance Specification Summary
SPECIFICATION MIN TYP MAX UNIT
Input Voltage PACK+/BAT– 2.6 4.5 VCharge and Discharge Current
(1)
2.5 A
(1)
Charge and discharge maximum is limited by the PCB design and power dissipation of the 20-m Ω1/4-W sense resistorincluded in the kit.
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7 EVM Hardware and Software Setup
7.1 Software Installation
7.2 Hardware Connection
7.2.1 Connecting the bq27x10EVM Circuit Module to a Battery Pack
+
PACK+ BAT-
PACK-
System Load/
Charger
Single Cell Li-Ion
-
7.2.2 PC Interface Connection
EVM Hardware and Software Setup
This section describes how to install the bq27x10EVM PC software and how to connect the differentcomponents of the EVM.
The following steps install the bq27x10EVM evaluation software:1. Insert CD ROM into a CD ROM drive.2. Select the CD ROM drive using My Computer or File Manager.3. Select the ReadMeFirst.txt file.4. Follow the instructions to install USB drivers for EV2300.5. After installing the USB drivers for EV2300, double-click on the Setup.exe icon.6. The setup program installs a Windows™ application group
The three hardware components to the bq27x10EVM are:•The bq27x10EVM circuit module•The PC interface board (EV2300)•The PC.
Figure 8 shows how to connect the bq27x10EVM circuit module to a Li-ion cell and the systemload/charger.
Figure 8. bq27x10EVM Circuit Module Connection to Cells and System Load/Charger
The following steps configure the hardware for interface to the PC:1. Connect colored wires that are included with EV2300 to bq27x10EVM using Table 5 as a guide.2. For bq27010 connect the connector with colored wires to the HDQ connector that is on the EV2300.HDQ connection is located on the top right of EV2300. For the bq27210, connect the connector withcolored wires to the I
2
C connector that is on the EV2300. The I
2
C connection is just below the HDQconnection on the EV2300.3. Connect the PC USB cable to the EV2300 and the PC USB port.
The bq27x10EVM is now set up for operation.
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8 Operation
8.1 Starting the Program
Operation
Table 5. Circuit Module-to-EV2300 Connection
bq27x10EVM bq27x10EVM COLOR(bq27010) (bq27210)
SDA/HDQ SDA/HDQ BROWNPACK– PACK- BLACKPROG SCL WHITEPACK+
(1)
VOUT RED
(1)
This connection is not useful when using a system load, charger, ora power source (battery or external power supply). The red wire ofthe EV2300 connector gives access to a low-power, 3.3-V outputwhen connected to HDQ section of EV2300. Shield this wire whenit is not in use to avoid contacts with other connections such asground.
Run the program from the Start|Programs|Texas Instruments|bq27X10 Battery Gas Gauge menusequence. The software defaults to the PC USB port for communication. If the EV2300 is connected toUSB port, the program should load and display the initial data screen. If it is the first time that the programis used, then the user is prompted to select between the bq27010 or bq27210. Select the appropriatedevice, and then press the continue button.
Figure 9. Initial Register Screen
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8.2 Initialization
8.2.1 Loading the Sense Resistor Value
8.2.2 Programming the bq27x10 EEPROM
Operation
If the EV2300 is not connected to a USB port, the program displays a USB error message and thendisplays the initial data screen with no data in the register locations.
The comm port can be changed by selecting the port under the options menu.
This section describes the settings that must be made before the bq27x10EVM is evaluated.
The bq27x10EVM comes with a 20-m Ωsense resistor on the circuit board. Make sure the sense resistorvalue is entered in the Rs box at the top of the initial register screen. This value is used by the PCprogram to convert the bq27x10 data set to engineering units. A check mark in the display engineeringunits box displays the data set in engineering units. No check mark displays the data set just as thebq27x10 calculates them, i.e., in units of 3.57- µVh counts.
Each bq27x10 is programmed at the factory with default values in the EEPROM. The values in EEPROMshould be changed to match specific applications. The EEPROM values can be read by using theEEPROM screen.
Figure 10. EEPROM Screen
The values in the EEPROM can be easily changed using the EVM's auto programming feature. To use theauto program feature:1. Make sure VOUT of the EV2300 is connected to PROG of the EVM.
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8.2.3 Resetting the bq27x10
8.3 The Registers Screen
8.3.1 Options Menu
8.3.2 Commands Menu
8.3.3 GPIO Menu
Operation
2. Connect a 21-V supply across 21 V (J3-1) and BAT- (J2-2)
To change the EEPROM values, simply click on the value to be changed, enter the new value, and pressenter.
The EEPROM values can be stored in a file on the PC by using the File|Save Gas Gauge FlashConstants command from the pulldown menu. Similarly, a saved file can be loaded by using theFile|Open Gas Gauge Flash Constants command. Once the file is called up, the Write all EEPROMbutton can be used to write all the EEPROM values at once.
Note: Changing EEPROM data affects critical aspects of the bq27x10 operation. Review thebq27x10 data sheet to determine how to develop new data for the EEPROM based onyour application. It is recommended to first save the default EEPROM data as a file beforechanging the data. In this way, the default data programming can easily be restored.
The bq27x10 automatically uses the new EEPROM in its calculations once programmed.
The bq27x10 can be reset at anytime by using the Options|Special Options|Reset bq27x10 from thepulldown menu. When reset, the bq27x10 reinitializes all RAM registers.
In the Registers screen, all the bq27x10's RAM registers are displayed.
This menu allows the user to select among different options. These options include whether to enablescan of registers, select the file logging time rate, select the type of communication protocol (HDQ or I2C),or select the type of communication interface (EV2300 or EV2200).
With the bq27x10, several commands are performed by setting the appropriate bit in the MODE registerand then writing 0xA9 or 0x56 into address 0x00. With the Commands menu of the EVSW, the user mayperform the commands automatically. Among the selections are:•WRTNAC - If a user wants to write the NAC register to a specific value, the user writes that value tothe AT RATE register and then selects WRTNAC from the Commands menu.•DONE - The user selects DONE when charging is complete, and the monitor is not able to detect tapercurrent. It forces an update of internal registers to represent a full battery condition.•PRST - This command causes a reset except that NAC, LMD, and the CI bit in FLAGS register are notrestored to initial values. This command is intended for manufacturing use.•FRST - This command re-initializes all RAM registers. This command is intended for manufacturinguse.
•SHIP - Once this command is given, the bq27x10EVM enters ship mode if the HDQ has been pulledlow for at least 18 seconds. A full reset is forced when the part leaves ship mode.•WNACCI - It is identical to the WRTNAC command, but the CI bit in FLAGS is also cleared.•WRTCYC - It is used to transfer data from the AR registers to CYCT.•WRTLMD - It is used to transfer data from the AR registers to LMD.
This menu selects the function of the GPIO pin as an output or input. If selected as an output, theopen-drain output can be set to on or off.
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8.4 The EEPROM Screen
8.5 The Pro Screen
Operation
The EEPROM screen allows the user to read and write the 10 EEPROM registers of bq27x10. A changingof the status of the checkbox for Enable LMD Agingcauses an automatic write to the EEPROM to ensurethat the selection applies accordingly. When writing to the EEPROM, always ensure that the 21-V pulse toPROG pin is available.
The Taper Current EEPROM register includes the Taper Current value (bits 0-6) and the Enable LastMeasure Discharge Aging (bit 7). When registers are displayed with engineering units, the value shown forTaper Current is just taking in consideration bits 0-6. The user must rely on the Enable LMD Aging checkbox to determine this feature. When registers are not displayed in engineering units, the value shown forTaper Current includes all 8 bits of this register represented in hexadecimal numbers.
If either the DCFIX or TCFIX bits in the Pack Configuration EEPROM register are set, then the DCOMP orTCOMPis illustrated as Customer ID # accordingly. For example, if DCFIX bit is set, then the DCOMPregister is set as a customer ID and the default discharge rate compensation is used by the bq27x10regardless of the contents of the DCOMP register.
The EEPROM screen has two grids. The one to the right is the data that is contained in the EEPROM(addresses 0x76-0x7F) and RAM registers corresponding to EEPROM (addresses 0x46-0x4F).
The Pro screen allows the data location in the bq27x10 to be addressed individually by entering theaddress to be read or the address and data to be written. This screen can be helpful when evaluatingcommands that are used in host-side gauge applications.
Figure 11. Pro Screen
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8.6 The Calibration Screen
8.7 Data Logging
Operation
The Calibration screen allows the user to perform the CIO and CEO commands automatically. There aretwo ways to use the commands. Each command can be called individually or the board offset can bedetermined by selecting Compute Board Offset button. The result given by computing the board offsetcould be used to program the BOFF bits at the Pack Configuration EEPROM register.
Figure 12. Calibration Screen
The bq27x10 registers can be logged by using the data log function. To log the data and create a log file:1. Select the registers to log by clicking on the corresponding Log box in each row of data.2. Select File|Start Data Log from the pulldown menu.3. Enter the name of the data log file in the Name Datalog File box4. Click on the Open button5. To stop the data logging, select File|Close Data Log from the pulldown menu
The file can be imported into a text editor, spreadsheet, or word processor program.
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Operation
Table 6. Example Data Log
ELAPSED VOLTAGE TEMPSAMPLE STAMP NAC(s) COMP
1 3:31:30 PM 10 3829 1084.58 1084.582 3:31:40 PM 20 3829 1086.26 1086.263 3:31:50 PM 30 3832 1087.48 1087.484 3:32:00 PM 40 3800 1087.48 1087.485 3:32:10 PM 50 3786 1087.48 1087.486 3:32:20 PM 60 3786 1087.48 1087.487 3:32:30 PM 70 3630 1087.78 1087.788 3:32:40 PM 80 3622 1084.12 1064.919 3:32:50 PM 90 3614 1081.68 1062.4710 3:33:00 PM 100 3609 1078.02 1060.0311 3:33:10 PM 110 3603 1075.74 1033.3412 3:33:20 PM 120 3754 1075.74 1033.3413 3:33:30 PM 130 3762 1075.74 1033.3414 3:33:40 PM 140 3765 1075.74 1033.3415 3:33:50 PM 150 3767 1075.74 1033.3416 3:34:00 PM 160 3622 1073.91 1032.7317 3:34:10 PM 170 3609 1072.69 1032.7318 3:34:20 PM 180 3598 1070.25 1032.7319 3:34:30 PM 190 3593 1065.52 1032.7320 3:34:40 PM 200 3695 1065.52 1032.7321 3:34:50 PM 210 3810 1065.52 1032.7322 3:35:00 PM 220 3810 1065.52 1032.7323 3:35:10 PM 230 3813 1065.52 1032.7324 3:35:20 PM 240 3767 1065.52 1032.73
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FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATIONPURPOSES ONLY and is not considered by TI to be a finished end-product fit for general customer use. It generates, uses, andcan radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of thisequipment in other environments may cause interference with radio communications, in which case the user at his own expensewill be required to take whatever measures may be required to correct this interference. - SSZZ017A - February 2006
EVM IMPORTANT NOTICE (CATEGORY B)
IMPORTANT: TI is providing the enclosed HPA212 evaluation module under the following conditions:
This evaluation module (EVM) being provided by Texas Instruments (TI) is intended for use for ENGINEERING DEVELOPMENTOR EVALUATION PURPOSES ONLY and is not considered by Texas Instruments to be fit for commercial use. As such, this EVMmay not be complete in terms of design and/or manufacturing related protective considerations including product safety measurestypically found in the end-product incorporating the module. As a prototype, this product does not fall within the scope of theEuropean Union Directive on electromagnetic compatibility and on low voltage and therefore may not meet the technicalrequirements of the directive. This EVM is not subject to the EU marking requirements.
•Should this EVM not meet the specifications indicated in the User’s Guide the EVM may be returned within 30 daysfrom the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BYTI AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANYWARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.•The user assumes all responsibility and liability for proper and safe handling of the EVM. The user acknowledge that the useof the EVM could present serious hazards and that it is the user’s responsibility to take all precautions for the handling anduse of the EVMs in accordance with good laboratory practices. Please be aware that the products received may not beregulatory compliant or agency certified (FCC, UL, etc.). Due to the open construction of the product, it is the user’sresponsibility to take any and all appropriate precautions with regard to electrostatic discharge.•NEITHER PARTY WILL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, ORCONSEQUENTIAL DAMAGES.•TI is currently dealing with various customers for products, and therefore our arrangement with the user will not beexclusive.
•TI assumes no liability for applications assistance, customer product design, software performance, or infringementof patents or services described herein.•Please read the User’s Guide and specifically the section in the User’s Guide pertaining to warnings and restrictions prior tohandling the product. This section contains important information regarding high temperature and voltages which TIrecommends to be read before handling the EVMs. In case of any doubt regarding safety, please contact the TI applicationengineer.
•Persons handling the product should have electronics training and observe good laboratory practice standards.•No license is granted under any patent right or other intellectual property right of TI covering or relating to any combination,machine, or process in which such TI products or services might be or are used.•This Agreement is subject to the laws of the State of Texas, excluding the body of conflicts of laws and the United NationsConvention on the International Sale of Goods, and will be subject to the exclusive jurisdiction of the courts of the State ofTexas.
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 2.6 V to 4.5 V and the output voltage range of 2.6 V to 4.5 V.Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there arequestions 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 theEVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the loadspecification, please contact a TI field representative.During normal operation, some circuit components may have case temperatures greater than 25 °C. The EVM is designed tooperate properly with certain components above 70 °C as long as the input and output ranges are maintained. These componentsinclude but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types ofdevices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes nearthese devices during operation, please be aware that these devices may be very warm to the touch.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2006, Texas Instruments Incorporated

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