Texas Instruments Bq76930 Manuale utente

bq76930 and bq76940 Evaluation Module

User's Guide

Literature Number: SLVU925B

April 2014–Revised July 2014

Contents

1 Features.............................................................................................................................. 6

1.1 Kit Contents............................................................................................................... 6

1.2 Ordering Information..................................................................................................... 6

1.3 bq769x0 Circuit Module Performance Specification Summary..................................................... 6

1.4 Required Equipment..................................................................................................... 7

2 bq769x0 EVM Quick Start Guide ............................................................................................ 7

2.1 Before You Begin ........................................................................................................ 7

2.2 Quick Start ................................................................................................................ 8

3 Interface Adapter................................................................................................................ 11

4 bq76940/bq76930/bq76920 Software .................................................................................... 11

4.1 System Requirements.................................................................................................. 12

4.2 Installing the bq76940/bq76930/bq76920 Software ............................................................... 12

4.3 Interface Adapter ....................................................................................................... 12

4.4 Software Operation..................................................................................................... 12

5 Battery Management Studio Software................................................................................... 18

5.1 System Requirements.................................................................................................. 18

5.2 Installing bqStudio...................................................................................................... 18

5.3 Interface Adapter SMB................................................................................................. 18

5.4 bqStudio Operation..................................................................................................... 18

5.5 Firmware Programming................................................................................................ 20

5.6 Data Memory Configuration........................................................................................... 22

5.7 Chemistry View ......................................................................................................... 23

5.8 Calibration .............................................................................................................. 24

5.9 Device Control .......................................................................................................... 26

6 bq769x0 Circuit Module Use ................................................................................................ 26

6.1 Cell Simulator ........................................................................................................... 26

6.2 Minimum Operating Voltage........................................................................................... 27

6.3 Evaluating with Simulated Current ................................................................................... 27

6.4 Reducing the Cell Count............................................................................................... 28

6.5 Connecting Cells........................................................................................................ 29

6.6 Connecting to a Host................................................................................................... 30

6.7 Gauge Circuits .......................................................................................................... 30

6.8 Unused Components................................................................................................... 30

7 Circuit Module Physical Construction................................................................................... 31

7.1 Board Layout............................................................................................................ 31

7.2 bq76930EVM Circuit Module.......................................................................................... 38

7.3 bq76940EVM Circuit Module.......................................................................................... 49

8 Related Documents From Texas Instruments......................................................................... 59

Revision History.......................................................................................................................... 59

2Table of Contents SLVU925B–April 2014–Revised July 2014

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List of Figures

1 EVM Connection for Basic AFE Operation............................................................................... 9

2 EVM Connection for Basic Gauge Operation........................................................................... 11

3 bq76940/bq76930/bq76920 Evaluation Software Display ............................................................ 13

4 Registers View.............................................................................................................. 14

5 I2C Pro View................................................................................................................ 16

6 Sequence View............................................................................................................. 17

7 Target Selection Wizard................................................................................................... 19

8 bqStudio Window with Blank Gauge..................................................................................... 20

9 Firmware View.............................................................................................................. 21

10 Dashboard Adapter and Device Version Display ...................................................................... 21

11 Register View After Restart............................................................................................... 22

12 Data Memory Bit Field change ........................................................................................... 23

13 Chemistry View............................................................................................................. 24

14 Calibration View ............................................................................................................ 25

15 Example Voltage Calibration Successful................................................................................ 25

16 Advanced Comm SMB View ............................................................................................. 26

17 Simulating Current Setup.................................................................................................. 28

18 Top Silk Screen............................................................................................................. 32

19 Top Layer.................................................................................................................... 33

20 Layer 2....................................................................................................................... 34

21 Layer 3....................................................................................................................... 35

22 Bottom Layer................................................................................................................ 36

23 Bottom Silk Screen......................................................................................................... 37

24 bq76930EVM Top Assembly ............................................................................................. 38

25 bq76930EVM Bottom Assembly.......................................................................................... 39

26 bq76930EVM Schematic Diagram FETs................................................................................ 44

27 bq76930EVM Schematic Diagram AFE1 ............................................................................... 45

28 bq76930EVM Schematic Diagram AFE2 ............................................................................... 46

29 bq76930EVM Schematic Diagram Gauge ............................................................................. 47

30 bq76930EVM Schematic Diagram Cell Simulator ..................................................................... 48

31 bq76940EVM Top Assembly ............................................................................................. 49

32 bq76940EVM Bottom Assembly.......................................................................................... 50

33 bq76940EVM Schematic Diagram FETs................................................................................ 54

34 bq76940EVM Schematic Diagram AFE1 ............................................................................... 55

35 bq76940EVM Schematic Diagram AFE2 ............................................................................... 56

36 bq76940EVM Schematic Diagram Gauge ............................................................................. 57

37 bq76940EVM Schematic Diagram Cell Simulator ..................................................................... 58

SLVU925B–April 2014–Revised July 2014 List of Figures

www.ti.com

List of Tables

1 Ordering Information ........................................................................................................ 6

2 Performance Specification Summary ..................................................................................... 7

3 Reducing Cell Count....................................................................................................... 28

4 bq76930EVM Circuit Module Bill of Materials.......................................................................... 40

5 bq76940EVM Circuit Module Bill of Materials.......................................................................... 51

4List of Tables SLVU925B–April 2014–Revised July 2014

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General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines

WARNING

Always follow TI’s set-up and application instructions, including use of all interface components within their

recommended electrical rated voltage and power limits. Always use electrical safety precautions to help

ensure your personal safety and the safety of those working around you. Contact TI’s Product Information

Center http://support/ti./com for further information.

Save all warnings and instructions for future reference.

Failure to follow warnings and instructions may result in personal injury, property damage, or

death due to electrical shock and/or burn hazards.

The term TI HV EVM refers to an electronic device typically provided as an open framed, unenclosed

printed circuit board assembly. It is intended strictly for use in development laboratory environments,

solely for qualified professional users having training, expertise, and knowledge of electrical safety risks in

development and application of high-voltage electrical circuits. Any other use and/or application are strictly

prohibited by Texas Instruments. If you are not suitably qualified, you should immediately stop from further

use of the HV EVM.

1. Work Area Safety:

(a) Keep work area clean and orderly.

(b) Qualified observer(s) must be present anytime circuits are energized.

electronics are energized, indicating operation of accessible high voltages may be present, for the

purpose of protecting inadvertent access.

(d) All interface circuits, power supplies, evaluation modules, instruments, meters, scopes and other

related apparatus used in a development environment exceeding 50 VRMS/75 VDC must be

electrically located within a protected Emergency Power Off (EPO) protected power strip.

(e) Use a stable and non-conductive work surface.

(f) Use adequately insulated clamps and wires to attach measurement probes and instruments. No

freehand testing whenever possible.

2. Electrical Safety:As a precautionary measure, it is always a good engineering practice to assume that

the entire EVM may have fully accessible and active high voltages.

(a) De-energize the TI HV EVM and all its inputs, outputs, and electrical loads before performing any

electrical or other diagnostic measurements. Revalidate that TI HV EVM power has been safely de-

energized.

(b) With the EVM confirmed de-energized, proceed with required electrical circuit configurations, wiring,

measurement equipment hook-ups and other application needs, while still assuming the EVM circuit

and measuring instruments are electrically live.

WARNING: while the EVM is energized, never touch the EVM or its electrical circuits as they

could be at high voltages capable of causing electrical shock hazard.

3. Personal Safety:

(a) Wear personal protective equipment, for example, latex gloves and/or safety glasses with side

shields or protect EVM in an adequate lucent plastic box with interlocks from accidental touch.

4. Limitation for Safe Use:

(a) EVMs are not to be used as all or part of a production unit.

Microsoft, Windows are registered trademarks of Microsoft Corporation.

SLVU925B–April 2014–Revised July 2014 List of Tables

User's Guide

SLVU925B–April 2014–Revised July 2014

bq76930 and bq76940 Evaluation Module User's Guide

The bq76930EVM evaluation module (EVM) is a complete evaluation system for the bq76930, a 6-cell to

10-cell Li-Ion battery analog front end (AFE) integrated circuit. The bq76940EVM evaluation module

(EVM) is a complete evaluation system for the bq76940, a 9-cell to 15-cell Li-Ion battery analog front end

(AFE) integrated circuit. The EVM consists of a circuit module which can be used for simple evaluation of

the AFE and bq78350 gauge functions. The circuit module includes one bq76930 or bq76940 integrated

circuit (IC), sense resistor, power FETs, and all other onboard components necessary to protect the cells

from overcharge, over discharge, short circuit, and overcurrent discharge in a 10- or 15-series cell Li-Ion

or Phosphate battery pack. The circuit module connects directly across the cells in a battery. With a

compatible interface board and Microsoft®Windows®based PC graphical user interface (GUI) software,

the user can view the device registers, adjust protection limits and enable FET control outputs.

1 Features

• Complete evaluation system for the bq76930 or bq76940 Li-Ion and Phosphate battery AFE

• Populated circuit module for 10-cell or 15-cell configuration for quick setup

• Power connections available on screw terminals

• Communication signals available on 4-pin connector

• Resistor cell simulator for quick setup with only a power supply

• PC software available for configuration

1.1 Kit Contents

• bq769x0 circuit module

• Cable to connect the EVM to an EV2400 or EV2300 interface board

1.2 Ordering Information

For complete ordering information, refer to the product folder at www.ti.com.

Table 1. Ordering Information

EVM Part Number Chemistry Configuration Capacity

bq76930EVM Li-Ion 10 cells Any

bq76940EVM Li-Ion 15 cells Any

NOTE: Although capacity is shown as Any, practical limits of the physical construction of the module

will typically limit the operation of the EVM to a 1P or 2P battery construction. Refer to the

physical construction section for board details.

1.3 bq769x0 Circuit Module Performance Specification Summary

This section summarizes the performance specifications of the bq769x0 circuit module in its default 10- or

15-cell configuration.

Typical voltage depends on the number of cells configured. Typical current depends on the application.

Board cooling may be required for continuous operation at or below maximum current.

6bq76930 and bq76940 Evaluation Module User's Guide SLVU925B–April 2014–Revised July 2014

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Features

Table 2. Performance Specification Summary

Specification Min Typ Max Unit

Input voltage BATT+ with respect to BATT– bq76930EVM 26 – 44 V

bq76940EVM 38 – 66 V

Continuous charge or discharge current 0 – 15 A

Operating temperature range 20 25 30 °C

1.4 Required Equipment

The following equipment is required to operate the bq769x0 EVM in a simple demonstration:

• DC power supply, 0-44 V (bq76930EVM) or 0-66 V (bq76940EVM) at 0.5 A for the AFE, 2.5 A for the

gauge

• DC voltmeter

• TI EV2300 or EV2400 interface board

• Computer with USB port and compatible Windows operating system and access to the internet

• Test leads to connect equipment

• Electronic load or assorted resistors, calibrated load or load with accurate current meter required for

gauge evaluation

Additional equipment may be desired to operate the bq769x0 with a more extensive demonstration.

2 bq769x0 EVM Quick Start Guide

2.1 Before You Begin

The following warnings and cautions are noted for the safety of anyone using or working close to the

bq76920 EVM. Observe all safety precautions.

Warning Warning Hot surface. Contact may cause burns. Do not touch

Caution Do not leave EVM powered when unattended.

Danger High The bq76940EVM is not rated as a high voltage EVM, has smaller

Voltage clearances than normally used on high voltage boards and does not have

an isolation boundary. If you apply high voltage to this board, all terminals

should be considered high voltage.

spacer

Electric shock is possible when connecting the board to live wire. The

board should be handled with care by a professional.

spacer

For safety, use of isolated test equipment with overvoltage and

overcurrent protection is highly recommended.

CAUTION

The circuit module has signal traces, components, and component leads on the

bottom of the board. This may result in exposed voltages, hot surfaces or sharp

edges. Do not reach under the board during operation.

SLVU925B–April 2014–Revised July 2014 bq76930 and bq76940 Evaluation Module User's Guide

bq769x0 EVM Quick Start Guide

www.ti.com

CAUTION

The circuit module may be damaged by overtemperature. To avoid damage,

monitor the temperature during evaluation and provide cooling, as needed, for

your system environment.

CAUTION

Some power supplies can be damaged by application of external voltages. If

using more than 1 power supply check your equipment requirements and use

blocking diodes or other isolation techniques, as needed, to prevent damage to

your equipment.

CAUTION

The communication interface is not isolated on the EVM. Be sure no ground

potential exists between the computer and the EVM. Also be aware that the

computer will be referenced to the Battery- potential of the EVM.

2.2 Quick Start

Determine if you wish to evaluate the AFE alone or with the gauge. For the AFE, proceed to Section 2.2.1.

For the gauge, skip to Section 2.2.2.

2.2.1 AFE Quick Start

These steps describe quick connection of the bq76930 and bq76940 EVMs to demonstrate operation of

the AFE portion of the EVM. For a more detailed description, refer to other sections of the user guide.

Refer to Figure 1 for the following steps:

1. Download the bq76940/bq76930/bq76920 evaluation software from the tool folder link

www.ti.com/tool/bq76940EVM or search from www.ti.com.

2. Install the bq76940/bq76930/bq76920 Evaluation Software. Software can be obtained from

www.ti.com. Install drivers for the EV2300, if necessary.

3. Remove shunts from headers connecting the AFE to the gauge

4. If the EV2300 is used, install shunts on the SCL and SDA pull-up headers. Remove any pull-up shunts

when using the EV2400.

5. Close all dip switch positions (default is closed)

6. Attach the interface board communication adapter to the PC using the USB cable. The EV2400 is

recommended, the EV2300 works if it is available and drivers are installed.

7. Attach the interface board I2C connector to the EVM I2C connector using the 4 pin cable.

8. Connect a 0-V DC power supply capable of 250 mA minimum to the “BATT” terminals and adjust to

approximately 38 V

9. Press and release the “BOOT” switch

10. Start the bq769X0 evaluation software. The graphical user interface (GUI) should display. Click on the

Scan box to enable repeated update of the display. The power supply may be adjusted within range of

the part to observe voltage changes in the GUI display Stack V/T/I section.

11. Set the voltage to approximately 38 V or a mid-range operating level. Clear any faults present by

clicking on the Clear Faults button of the All Read/Write Registers section of the GUI.

12. Click on the Continuous button in the GUI Coulomb Counter section. Enable the CHG_ON and

DSG_ON bits by clicking on the bit and commit the changes. Apply a load to the PACK terminals. Load

current must be within the capability of the supply and the components installed or 15 A, whichever is

lower. Observe the Coulomb Counter value change in the GUI display Stack V/T/I section.

8bq76930 and bq76940 Evaluation Module User's Guide SLVU925B–April 2014–Revised July 2014

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EV2300/

EV2400 I2C

DC Power Supply

+ -

Boot

switch

SMB Pull-ups

for

EV2300

Remove

for

EV2400

Remove gauge

shunts

Cell simulator

switches on for

power supply

www.ti.com

bq769x0 EVM Quick Start Guide

13. Make other adjustments as desired for evaluation.

Refer to other sections of this user guide for additional details.

Figure 1. EVM Connection for Basic AFE Operation

2.2.2 Gauge Quick Start

These steps describe quick connection of the bq769x0 EVM to demonstrate operation of the gauge

portion of the EVM. For more detailed descriptions, refer to other sections of the user guide. If you are

new to bqStudio software, you may wish to refer to the more detailed instructions for installing the

software in Section 5 before using the quick start.

Refer to Figure 2 for the following steps.

1. Download the Battery Management Studio (bqStudio) software from the bq78350 product folder link

www.ti.com/product/bq78350 or search from www.ti.com.

2. Install the bqStudio software. Install drivers for the EV2300, if necessary.

3. Download the bq78350_xxxx.srec firmware file from the bq78350 product folder

www.ti.com/product/bq78350 and save it to a temporary location on your computer.

4. Install 4 shunts on the J14 header connecting the AFE to the gauge: SCL, SDA, REGOUT and ALERT.

5. Install shunts on the SCL and SDA pull-up headers.

6. Install shunts on the /KEYIN, /PRES, 16/17 and H positions of the other headers.

7. Close all dip switch positions (default is closed).

8. Attach the interface board communication adapter to the PC using USB cable. The EV2400 is

recommended, the EV2300 works if it is available and drivers are installed.

9. Attach the interface board SMB connector to the EVM SMB connector using the 4-pin cable.

10. Remove any connection to the I2C connector. This connector must remain open for operation with the

gauge.

11. Connect a 0-V DC power supply capable of 2 A minimum to the “BATT” terminals and adjust to

approximately 3V/cell (30 V for bq76930EVM, or 45 V for bq76940EVM) .

12. Press and release the BOOT switch.

13. Start the bqStudio software. The bq78350 on the EVM is shipped blank, so the bqStudio will present a

Target Selection Wizard box. Select the latest version of the bq78350 from the list and select the

Finish button. Acknowledge the Proceed and the Battery Management Studio Timeout windows. The

SLVU925B–April 2014–Revised July 2014 bq76930 and bq76940 Evaluation Module User's Guide

bq769x0 EVM Quick Start Guide

www.ti.com

GUI should display.

14. Click on the Firmware button at the top of the window to select the firmware view. Click on the

Browse button right of the program window, navigate to the .srec file you stored and select the file.

Click on the Program button. Wait for the programming status window to close, typically about 45 s.

15. Restart the bqStudio software so it can autodetect the device.

16. In the registers view, select the Refresh button and observe that there are 3 cell voltages.

17. Change the cell count to the number of cells supported by the board: Select the Data Memory view,

then the Settings button and the AFE Cell Map register. Change the value to the cells supported

(0x03FF for bq76930EVM, or 0x7FFF for bq76940EVM) and click on the Write to Data Memory

button. Read data memory if desired to confirm the new value.

18. Send a Reset command using the Commands view or the from the Advanced Comm SMB view.

19. Select the Registers view and Refresh the values. Observe that all supported cells now show a

voltage reading.

20. Send the FET_EN command using the Commands view or the from the Advanced Comm SMB view.

21. Select the Registers view and Refresh the values. Observe that the FET_EN bit is now set and that

the CHG and DSG FET status is shown enabled.

22. Select the Calibration bq78350 view.

23. Enter the board temperature in the Temperature Sensor boxes and click on the Calibrate

Temperature button. Wait until a check box appears next to the button.

24. Measure the voltage of the BATT terminals. Divide the value by the number of cells and enter the

value in mV in the Ext Average Cell Voltage box. Click on the Calibrate Voltage button. Wait until a

check box appears next to the button.

25. Disconnect the load from the PACK terminals. Click on the Calibrate CC Offset button and wait until

the check mark appears next to the button.

26. Connect the load set to a known value of approximately 2 A to the PACK terminals. Enter the value in

mA into the Applied Current box. Discharge current should be entered as a negative value. Click on

the Calibrate Current button and wiat until the check mark appears next to the button.

27. Select the Registers view and Refresh the values. Observe the updated voltage, temperature and

current values.

The EVM is functioning and ready for further configuration for evaluation. Refer to the TRM or other

documents for the bq78350, and the other sections of this user guide for additional information.

10 bq76930 and bq76940 Evaluation Module User's Guide SLVU925B–April 2014–Revised July 2014

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