Texas Instruments Bq20z65EVM-001 User manual

User's GuideSLUU353 – June 2009

bq20z65EVM-001 SBS 1.1 Impedance Track™ TechnologyEnabled Battery Management Solution Evaluation Module

This evaluation module (EVM) is a complete evaluation system for the bq20z65/bq29412 batterymanagement system. The EVM includes one bq20z65/bq29412 circuit module and a link toWindows™-based PC software. The circuit module includes one bq20z65 integrated circuit (IC), onebq29412 IC, and all other onboard components necessary to monitor and predict capacity, perform cellbalancing, monitor critical parameters, protect the cells from overcharge, over-discharge, short-circuit, andovercurrent in 2-, 3- or 4-series cell Li-ion or Li-polymer battery packs. The circuit module connects directlyacross the cells in a battery. With the EV2300 interface board and software, the user can read thebq20z65 data registers, program the chipset for different pack configurations, log cycling data for furtherevaluation, and evaluate the overall functionality of the bq20z65/bq29412 solution under different chargeand discharge conditions.

Contents1 Features ....................................................................................................................... 22 bq20z65-Based Circuit Module ............................................................................................ 23 bq20z65 Circuit Module Schematic ....................................................................................... 34 Circuit Module Physical Layouts and Bill of Materials .................................................................. 35 EVM Hardware and Software Setup ...................................................................................... 86 Troubleshooting Unexpected Dialog Boxes .............................................................................. 87 Hardware Connection ....................................................................................................... 88 Operation ..................................................................................................................... 99 Calibration Screen.......................................................................................................... 1210 Pro (Advanced) Screen .................................................................................................... 1311 Related Documentation from Texas Instruments ...................................................................... 14

List of Figures

1 bq20z65EVM-001 Layout – Silk Screen .................................................................................. 42 Top Assembly ................................................................................................................ 43 Top Layer ..................................................................................................................... 44 Bottom Layer ................................................................................................................. 55 Bottom Assembly ............................................................................................................ 56 Schematic ..................................................................................................................... 77 bq20z65 Circuit Module Connection to Cells and System Load/Charger ............................................ 98 SBS Data Screen........................................................................................................... 109 Data Flash Screen, 1st Level Safety Class ............................................................................. 1110 Calibration Screen.......................................................................................................... 1311 Pro (Advanced) Screen .................................................................................................... 14

List of Tables

1 Ordering Information ........................................................................................................ 22 Components and Flash-Memory Settings for Different Precharge Modes ........................................... 33 Bill of Materials ............................................................................................................... 54 Performance Specification Summary ..................................................................................... 85 Circuit Module to EV2300 Connections ................................................................................... 9

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1 Features

1.1 Kit Contents

1.2 Ordering Information

2 bq20z65-Based Circuit Module

2.1 Circuit Module Connections

2.2 Pin Descriptions

Features

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•Complete evaluation system for the bq20z65 SBS 1.1-compliant advanced gas gauge with ImpedanceTrack™ technology and bq29412 independent overvoltage protection IC•Populated circuit module for quick setup•Software that allows data logging for system analysis

•bq20z65/bq29412 circuit module•Set of support documentation

Table 1. Ordering Information

EVM PART NUMBER CHEMISTRY CONFIGURATION CAPACITY

bq20z65EVM-001 Li-ion 2, 3, or 4 cell Any

The bq20z65/bq29412-based circuit module is a complete and compact example solution of a bq20z65circuit for battery management and protection of Li-ion or Li-polymer packs. The circuit moduleincorporates a bq20z65 battery monitor IC, bq29412 independent overvoltage protection IC, and all othercomponents necessary to accurately predict the capacity of 2-, 3-, or 4-series cells.

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)

PIN NAME DESCRIPTION

1N -ve connection of first (bottom) cell1P +ve connection of first (bottom) cell2P +ve connection of second cell3P +ve connection of third cell4P +ve connection of fourth (top) cellSMBC Serial communication port clockSMBD Serial communication data portSYS PRES System present pin (if low, system is present)PACK- Pack negative terminalVSS Pack negative terminalPACK+ Pack positive terminal

Impedance Track, bqEasy are trademarks of Texas Instruments.Windows is a trademark of Microsoft Corporation.

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3 bq20z65 Circuit Module Schematic

3.1 Schematic

3.2 Modifications for Choosing Particular Precharge Mode

3.3 Testing Fuse-Blowing Circuit

4 Circuit Module Physical Layouts and Bill of Materials

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bq20z65 Circuit Module Schematic

This section contains information for modifying and choosing a precharge mode for bq20z65/bq29412implementation.

The schematic follows the bill of materials in this user's guide.

In order to charge, the charge FET (CHG-FET) must be turned on to create a current path. When theV

(BAT)

is 0 V and CHG-FET = ON, the V

(PACK)

is as low as the battery voltage. In this case, the supplyvoltage for the device is too low to operate. This function has three possible configurations, and the IC canbe 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) tosustain the PACK+ voltage level.2. Common FET mode - Does not use a dedicated precharge FET. The charge FET (CHG-FET) is set toON state as default.3. Precharge FET mode - Dedicates a precharge current path using an additional open-drain (OD) pindrive FET (PCHG-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 , anduse the given settings of DF.Configuration, ZVCHG1, 0.

Table 2. Components and Flash-Memory Settings for Different PrechargeModes

MODE RESISTORS PRECHG FET ZVCHG1 ZVCHG0

1. 0-V Chg (default) R21, R28 Q3 0 02. Common FET R24 Q2 0 13. Precharge R23, R28 Q3 1 0

For more details about precharge operation and mode choices, see the bq20z65 data sheet (SLUS878 ).

To prevent the loss of board functionality during the fuse-blowing test, the actual chemical fuse is notprovided in the circuit. FET Q1 drives TP3 low if a fuse-blow condition occurs; so, monitoring TP3 can beused to test this condition. Fuse placement on the application board is shown in the bq20z65 data sheetreference-board schematic.

This section contains the printed-circuit board (PCB) layout, bill of materials, and assembly drawings forthe bq20z65/bq29412 circuit module.

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4.1 Board Layout

Circuit Module Physical Layouts and Bill of Materials

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This section shows the dimensions, PCB layers (Figure 1 through Figure 5 ), and assembly drawing for thebq20z65 module.

Figure 1. bq20z65EVM-001 Layout – Silk Screen

Figure 2. Top Assembly

Figure 3. Top Layer

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4.2 Bill of Materials and Schematic

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Circuit Module Physical Layouts and Bill of Materials

Figure 4. Bottom Layer

Figure 5. Bottom Assembly

Table 3. Bill of MaterialsCount RefDes Description Size Mfr Part Number

21 C1–C9, C12, Capacitor, Ceramic, 0.1 µF, 50 V, X7R, 20% 0603 Any STDC13, C15–C18,

C23, C24,C26–C28

1 C11 Capacitor, Ceramic, 0.22 µF, 50 V, X7R, 20% 0603 Any STD

1 C19 Capacitor, Ceramic, 4.7 µF, 10 V, X7R, 20% 0603 Any STD

1 C20 Capacitor, Ceramic, 47nF, 50 V, X7R, 20% 0603 Any STD

2 C22, C25 Capacitor, Ceramic, 0.47 µF, 16 V, X7R, 20% 0603 Any STD

3 C10, C14, C21 Capacitor, Ceramic, 1.0 µF, 25 V, X7R, 20% 0805 Any STD

4 D1–D3, D11 Diode, Switching, 150-mA, 75-V, 350mW SOT23 Vishay-Liteon BAS16

2 D4, D5 Diode, Dual, Zener, 5.6V, 300mW SOT23 Vishay- AZ23C5V6Telefunken

5 D6–D10 Diode, LED, Green, Gullwing, GW Type, 20ma, 7.5 0.120 ×0.087 Panasonic LN1361Cmcd typ. inches

1 J1 Header, Friction Lock Ass'y, 4-pin Right Angle, 0.400 ×0.500 Molex 22-05-3041

1 Q1 MOSFET, N-ch, 20-V, 1.3A, 0.16- ΩSOT23 Fairchild NDS331N

2 Q2, Q4 MOSFET, N-ch Logic Level, Power Trench, 30V, 11A, SO8 Fairchild FDS6690A12.5 m Ω

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Circuit Module Physical Layouts and Bill of Materials

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Table 3. Bill of Materials (continued)Count RefDes Description Size Mfr Part Number

1 Q3 MOSFET, P-ch, 30-V, 8.0-A, 20-m ΩSO8 Siliconix Si4435DY

1 Q6 MOSFET, Nch, 50V, 0.22A, 6 ΩSOT23 Fairchild BSS138

12 R1–R5, R12, Resistor, Chip, 100- Ω, 1/16-W, 5% 0603 Std StdR13, R32–R34,

R38, R39

1 R11 Resistor, Chip, 0.010 Ω, 1-W, xx% 2512 Vishay WSL-2512-010 1%R86

3 R15, R16, R40 Resistor, Chip, 220 k Ω, 1/16-W, 5% 0603 Std Std

1 R17 Resistor, Chip, 300- Ω, 1-W, 10% 2512 WSL-2512-300 1%R86

2 R18, R27 Resistor, Chip, 3.01M Ω, 1/16-W, 5% 0603 Std Std

5 R14, R19, Resistor, Chip, 5.1k Ω, 1/16-W, 5% 0603 Std StdR21–R23

4 R20, R36, R37, Resistor, Chip, 1M Ω, 1/16-W, 5% 0603 Std StdR41

2 R24, R28 Resistor, Chip, 100k Ω, 1/16-W, 5% 0603 Std Std

2 R25, R29 Resistor, Chip, 8.45k Ω, 1/16-W, 1% 0603 Std Std

2 R26, R30 Resistor, Chip, 61.9k Ω, 1/16-W, 1% 0603 Std Std

7 R6–R10, R31, Resistor, Chip, 1k Ω, 1/16-W, 5% 0603 Std StdR35

2 RT1, RT2 Thermistor, 10k Ω0.095 ×0.150 Semitec NTC103AT

1 SW1 Switch, Push button, Momentary, N.O. Low Profile 5 mm ×5 mm Panasonic EVQPLCxxxx

2 TB1, TB4 Terminal Block, 2-pin, 6-A, 3,5mm 0.27 ×0.25 OST ED1514

2 TB2, TB3 Terminal Block, 3-pin, 6-A, 3,5mm 0.41 ×0.25 OST ED1515

1 TP1 Test Point, Black, Thru Hole Color Keyed 0.100 ×0.100 inch Keystone 5001

1 TP3 Test Point, White, Thru Hole Color Keyed 0.100 ×0.100 inch Keystone 5002

1 U1 IC, Voltage Protection for 2, 3, 4 Cell Lion , 2nd SSOP-08 TI BQ29412DCTProtection, 4.45 V OVP

1 U2 IC, Cool-GG Programmable Battery Management TSSOP30 TI bq20z65DBT

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4.3 bq20z65/bq29412 Circuit Module Performance Specification Summary

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Circuit Module Physical Layouts and Bill of Materials

Figure 6. Schematic

This section summarizes the performance specifications of the bq20z65/bq29412 circuit module.

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5 EVM Hardware and Software Setup

5.1 System Requirements

5.2 Software Installation

6 Troubleshooting Unexpected Dialog Boxes

7 Hardware Connection

7.1 Connecting bq20z65/bq29412 Circuit Module to Battery Pack

EVM Hardware and Software Setup

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Table 4. Performance Specification Summary

Specification Minimum Typical Maximum Units

Input voltage Pack+ to Pack– 6 15 25 VCharge and discharge current 0 2 7 A

This section describes how to install the bq20z65 PC software and how to connect the differentcomponents of the EVM.

The bq20z65EVSW software requires Windows™ 2000 or Windows XP.

Find the latest software version in the bq20z65 tool folder on power.ti.com . Use the following steps toinstall the bq20z65EVSW software:1. Copy the files from the Ti Web site into a temporary directory you select, double-click onbqEV-EASYSetup00.09.xx.exe, where xx indicates the version, and follow the installer instructions tocomplete the bq20z60 EVSW installation.2. If the EV2300 was not previously installed, after bq20z60 EVSW installation, a TI USB DRIVERINSTALLER pops up. Click Yes for the agreement message and follow its instructions. Two drivers areassociated with the EV2300. Follow the instructions to install both. Do not reboot the computer, even ifasked to do so.3. Plug the EV2300 into a USB port. The Windows system may show a prompt that new hardware hasbeen found. When asked, "Can Windows connect to Windows Update to search for software?", select"No, not this time" and click on NEXT. In the next dialog window, it indicates "This wizard helps youinstall software for: TI USB Firmware Updater", select "Install the software automatically(Recommended)" and click NEXT. It is common for the next screen to be the Confirm File Replacescreen. Click No to continue. If this screen does not appear, then go to the next step. After Windowsindicates that the installation was finished, a similar dialog window pops up to install the second driver;proceed with the same installation preference as the first one. The second driver is TI USB bq80xxDriver.

The following actions can help the user to avoid 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 theoperating system policy.

The bq20z65EVM-001 comprises three hardware components: the bq20z65/bq29412 circuit module, theEV2300 PC interface board, and the PC.

Figure 7 shows how to connect the bq20z65/bq29412 circuit module to the cells and system load/charger.

The cells must be connected in the following order:

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7.2 PC Interface Connection

8 Operation

8.1 Starting the Program

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Operation

1. 4-Cell Pack: 1N (BAT–), 1P, 2P, 3P, and 4P (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 sleepmode, disconnect the SYS PRES pin.

Figure 7. bq20z65 Circuit Module Connection to Cells and System Load/Charger

The following steps configure the hardware for interface to the PC:1. Connect the bq20z65-based smart battery to the EV2300 using wire leads as shown in Table 5 .

Table 5. Circuit Module to EV2300 Connections

bq20z65-Based Battery EV2300

SMBD SMBDSMBC SMBCVSS GND

2. Connect the PC USB cable to the EV2300 and the PC USB port.

The bq20z65EVM-001 is now set up for operation.

This section details the operation of the bq20z65 EVSW software.

Run bq Evaluation Software from the Start | Programs | Texas Instruments | bq20z65 EVSW menusequence. The SBS Data screen (Figure 8 ) appears. Data begins to appear once the < Refresh> (singletime scan) button is clicked, or when the < Keep Scanning> check box is checked. To disable the scanfeature, deselect < Keep Scanning>.

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 scannedwithin this period.

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Operation

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The bq Evaluation Software provides a logging function which logs the values that were last scanned byEVSW. To enable this function, select the Start Logging button; this causes the Keep Scanning button tobe selected. When logging is Stopped, the keep scanning button is still selected and has to be manuallyunchecked.

The logging intervals are specified under the | Options | menu with the maximum value of 65535 ms. TheLog interval cannot be smaller than the scan interval because this results in the same value being loggedat least twice.

Figure 8. SBS Data Screen

This screen (Figure 8 ) shows the SBS data set along with additional ManufacturersAccess() commandinformation such as individual cell measurements. Additional Flag and Static data can be viewed byselecting 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 separatelyusing 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 ofthe Flags/Static Data display. Selecting | View |, then | Auto Arrange | returns the splitter bar to its originallocation.

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