Texas Instruments bq4050EVM-561 User manual

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bq4050EVM-561 Evaluation Module
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User's Guide
SLUUBF9–March 2016
bq4050EVM-561 Evaluation Module
This evaluation module (EVM) is a complete evaluation system for the bq4050. This EVM includes one
bq4050 circuit module and an external current-sense resistor. A separate orderable EV2300 or EV2400
PC interface board for gas gauge along with a PC USB cable, and Microsoft®Windows®based PC
software is needed when using this EVM. The circuit module includes one bq4050 integrated circuit and
all other onboard components necessary to monitor and predict capacity for a system-side or removable
battery pack fuel gauge solution. With the EV2300 or EV2400 users can:
• Read the bq4050 data registers
• Program the chipset for different configurations
• Log cycling data for further evaluation
• Evaluate the overall functionality under different charge and discharge conditions
Contents
1 Features....................................................................................................................... 2
1.1 Kit Contents.......................................................................................................... 2
1.2 Ordering Information ............................................................................................... 2
1.3 bq4050 Circuits Module Performance Specification Summary ............................................... 2
2 bq4050EVM Quick Start Guide ............................................................................................ 3
2.1 Items Needed for EVM Setup and Evaluation .................................................................. 3
2.2 System Requirements.............................................................................................. 3
2.3 Software Installation................................................................................................ 3
2.4 Troubleshooting Unexpected Dialog Boxes..................................................................... 3
2.5 EVM Connections................................................................................................... 3
2.6 PC Interface Connection........................................................................................... 5
3 Operation ..................................................................................................................... 6
3.1 Starting the Program ............................................................................................... 6
3.2 Setting Programmable bq4050 Options ......................................................................... 7
3.3 Calibration ........................................................................................................... 8
3.4 Setting the CEDV Parameters .................................................................................... 9
3.5 Firmware Screen .................................................................................................. 10
3.6 Advanced Comm SMB Screen.................................................................................. 10
4 Circuit Module Physical Layout, Bill of Materials and Schematic.................................................... 12
4.1 Board Layout....................................................................................................... 12
4.2 Bill of Materials .................................................................................................... 15
4.3 Schematic .......................................................................................................... 16
5 Related Documentation from Texas Instruments ...................................................................... 17
List of Figures
1 bq4050 Circuit Module Connection to Pack and System Load or Charger .......................................... 4
2 Cell Connection Configuration ............................................................................................. 4
3 Registers Screen............................................................................................................. 6
4 Data Memory Screen........................................................................................................ 7
5 Calibration Screen........................................................................................................... 8
6 CEDV Coefficients Calculation Flow ...................................................................................... 9
7 Firmware Screen ........................................................................................................... 10

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8 Advanced Comm SMB Screen........................................................................................... 11
9 Top Silkscreen.............................................................................................................. 12
10 Bottom Silk Screen......................................................................................................... 12
11 Top Assembly............................................................................................................... 12
12 Bottom Assembly........................................................................................................... 13
13 Top Layer.................................................................................................................... 13
14 Inner Layer 1................................................................................................................ 13
15 Inner Layer 2................................................................................................................ 14
16 Bottom Layer................................................................................................................ 14
17 bq4050EVM Schematic.................................................................................................... 16
List of Tables
1 Ordering Information ........................................................................................................ 2
2 Performance Specification Summary ..................................................................................... 2
3 EVM Pins Descriptions...................................................................................................... 5
4 Circuit Module to EV2300 or EV2400 Connections ..................................................................... 5
5 Bill of Materials ............................................................................................................. 15
1 Features
This EVM has the following features:
• Complete evaluation system for the bq4050 CEDV gas gauge
• Populated circuit module for quick setup
• Personal computer (PC) software and interface board for easy evaluation
• Software allows data logging for system analysis
1.1 Kit Contents
The following is a list of the contents included with the EVM:
• bq4050 and BQ296103 circuit module
• Cable to connect the EVM to an EV2300 or EV2400 communications interface adapter
• This EVM is used for the evaluation of bq4050. Visit the product Web folder at www.ti.com to properly
configure the bq4050.
1.2 Ordering Information
Table 1 lists the EVM ordering information.
Table 1. Ordering Information
Part Number EVM Part Number Configuration Chemistry
bq4050 bq4050EVM-561 1-, 2-, 3-, or 4-cell Li-ion
1.3 bq4050 Circuits Module Performance Specification Summary
This section summarizes the performance specifications of the bq4050 circuit module.
Table 2. Performance Specification Summary
Specification Min Typ Max Units
Input Voltage Pack+ to Pack– 3 15 26 V
Charge and discharge current 0 2 7 A

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2 bq4050EVM Quick Start Guide
This section provides the step-by-step procedures required to take a new EVM and configure it for
operation in a laboratory environment.
2.1 Items Needed for EVM Setup and Evaluation
The following items are required for setup and evaluation:
• bq4050 circuit module
• EV2300 or EV2400 communications interface adapter
• USB cable to the communications interface adapter to the computer
• Computer setup with Windows XP or higher operating system
• Access to the internet to download bqStudio software setup program
• One-to-four battery cells or 1-kΩresistors to configure a cell simulator
• DC power supply that can supply 16.8 V and 2 A. (Constant current and constant voltage capability is
desirable.)
2.2 System Requirements
The bqStudio software requires Windows XP or later. Using later versions of Windows operating system
can have issues with the 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.
2.3 Software Installation
Find the latest software version of bqStudio on http://www.ti.com/tool/bqstudio. Search by part number for
bq4050 to access the tool folder for the device. Use the following steps to install bq4050 bqStudio
software.
1. Ensure that the EV2300 or EV2400 is not connected to the personal computer (PC) through the USB
cable before starting this procedure.
2. Open the archive containing the installation package and copy its contents into a temporary directory.
3. Open the bqStudio installer file that was downloaded from the TI Web site.
4. Follow the on-screen instructions until completing the software installation.
5. Before starting the evaluation software, connect the EV2300 or EV2400 to the computer using the USB
cable.
6. If EV2300 is connected, wait until the system prompt New Hardware Found appears. Choose Select
Location Manually and use the Browse button to point to subdirectory TIUSBWin2K-XP-1.
7. Answer Continue to the warning that drivers are not certified with Microsoft.
8. If the EV2300 is connected, after the previous installation finishes, another system prompt New
Hardware Found appears. Repeat steps 1 through 5, but specify the directory as TIUSBWin2K-XP-2.
9. Answer Continue to the warning that drivers are not certified with Microsoft. Driver installation is now
finished.
10. For the EV2400, the driver should be installed along with software installation.
2.4 Troubleshooting Unexpected Dialog Boxes
The user 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. If using Windows 7,
install the software with administrator privileges.
2.5 EVM Connections
The bq4050 evaluation system comprises three hardware components: (1) the bq4050 circuit module, (2)
the EV2300 or EV2400 PC interface board, and (3) the PC.

PACK+
SYS PRES
PACK–
+–
EV2300
Load/Charger
SMBD SMBC VSS
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2.5.1 Connecting the bq4050 Circuit Module to a Battery Pack
Figure 1 illustrates the circuit module connections.
Figure 1. bq4050 Circuit Module Connection to Pack and System Load or Charger
2.5.2 Circuit Module Connections
Contacts on the circuit module provide the following connections:
• Direct connection to the battery pack (J1 and J5): 1N, 1P, 2P, 3P, 4P
Attach the cells to the J1 and J5 terminal block. A specific cell connection sequence is not required;
although, it is good practice to start with lowest cell in the stack (cell 1), then attach cells 2 through 4 in
sequence. The U1 and U2 devices should not be damaged by other cell connection sequences, but
there is a possibility that the bq296103 could blow the fuse in an application where the fuse is installed.
Attaching cells starting with cell 1 should eliminate this risk. A short should be placed across unused
voltage sense inputs (see Figure 2).
Figure 2. Cell Connection Configuration
A resistor cell simulator can be used instead of battery cells. Connect a resistor between each of the
contacts on the J1 or J5 connector. For example, from 1N to 1P, from 1P to 2P, and so forth, until the
desired number of cells has been achieved. A power supply can provide power to the cell simulator.
Set the power supply to the desired cell voltage × the number of cells and attach the ground wire to 1N
and the positive wire to 4P. For example, for a 3S configuration with a 3.6-V cell voltage, set the power
supply to 3 × 3.6 = 10.8 V.
• Charger/load connection (J3 and J4): PACK+ and PACK–
Attach the load or power supply to the J3 or J4 terminal block. The positive load or power supply wire
should be connected to at least one of the first two terminal block positions labeled PACK+. The
ground wire for the load or power supply should be connected to the last terminal block positions
labeled PACK–.

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• I2C communication port (J2): SMBD, SMBC, and VSS
Attach the communications interface adapter cable to J2 and to the SMB port on the EV2300.
• Signal outputs (J3): SYS_PRES
To start charge or discharge test, connect the SYS_PRES position on the J3 terminal block to PACK–.
The SYS_PRES can be left open if the non-removable (NR) bit is set to 1 in the Pack Configuration A
register. To test sleep mode, disconnect the SYS_PRES pin.
• Wake-up the device up from shutdown (WAKE)
Press the Wake pushbutton switch to temporarily connect BAT+ to PACK+. This applies voltage to the
PACK pin on the bq4050 to power-up the regulators and start the initialization sequence.
• Parameter setup
The default data flash settings configure the device for 3-series Li-Ion cells. Change the | Data Flash |
Settings |DA Configuration register to set up the number of series cells to match the physical pack
configuration. This provides basic functionality to the setup. Other data flash parameters should also
be updated to fine tune the gauge to the pack. See the bq4050 technical reference manual (TRM)
(SLUSC67) for parameter settings.
2.5.3 Pin Description
Table 3 lists the EVM pin descriptions.
Table 3. EVM Pins Descriptions
Pin Name Description
PACK+ Pack positive terminal
PACK– Pack negative terminal
4P Positive connection to Cell #4
3P Positive connection to Cell #3
2P Positive connection to Cell #2
1P Positive connection to Cell #1
1N Negative connection to Cell #1
SYS_PRES Connection to pull SYS_PRES to PACK- to enable the FETs
SMBD SMBus communication data line
SMBC SMBus communication clock line
VSS Ground return for the SMBus signals
2.6 PC Interface Connection
The following steps configure the hardware for interface to the PC.
1. Connect the bq4050-based EVM to the EV2300 or EV2400 using wire leads as shown in Table 4.
2. Connect the PC USB cable to the EV2300 or EV2400 and the PC USB port.
Table 4. Circuit Module to EV2300 or EV2400 Connections
bq4050EVM EV2300 EV2400
SMBD SMBD PORT1 - SDA
SMBC SMBC PORT1 - SCL
VSS GND PORT1 - VSS
The bq4050EVM-561 is now set up for operation.

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3 Operation
This section details the operation of the bq4050 bqStudio software.
3.1 Starting the Program
With the EV2300 or EV2400 and the bq4050EVM connected to the computer, run bqStudio from the
Desktop or installation directory. The window consists of a tools panel at the top and other child windows
that can be hidden, docked in various positions, or allowed to float as separate windows. When bqStudio
first starts up the DashBoard, the Registers, and Commands windows should be open. Additional windows
can be added by clicking the corresponding icons in the tools panel at the top of the main window.
The Scan (continuous scan) or Refresh (single time scan) buttons can be clicked in order to update the
data in the Registers and Data Memory windows.
bqStudio provides a logging function which logs selected Data Registers last received from the bq4050.
To enable this function, click the Start Log button. The default elapsed interval is 4000 milliseconds, to
change this interval, go to Windows, select Preferences, choose Registers, and change the Scan/Log
Interval from 4000 to 1000 milliseconds. There is no need to log faster than 1 second as the gauge will not
update the registers faster than 1 second.
The Registers section contains parameters used to monitor gauging. The Bit Registers section provides a
bit-level picture of status and fault registers. A green flag indicates that the bit is 0 (low state) and a red
flag indicates that the bit is 1 (high state). Data begins to appear once the Refresh (single-time scan)
button is selected, or it scans continuously if the Scan button is selected.
Figure 3. Registers Screen

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3.2 Setting Programmable bq4050 Options
The bq4050 comes configured per the default settings detailed in the bq4050 TRM (SLUSC67). Ensure
that the settings are correctly changed to match pack and application for the bq4050 solution being
evaluated.
IMPORTANT: The bq4050 comes up UNSEALED but not in FULL ACCESS. The keys to enter FULL
ACCESS must be sent to the device before being able to access the data memory.
IMPORTANT: The correct setting of these options is essential to get the best performance. The settings
can be configured using the Data Memory window (Figure 4).
Figure 4. Data Memory Screen
To read all the data from the bq4050 non-volatile flash memory, click on the Read All button on the Data
Memory window. Make sure the device is not sealed and in full access to read or write to the data
memory. To update a parameter, click on the desired parameter and a window pops-up that provides
details on the selected parameter. Next, enter the value in the value textbox and press Enter. After
pressing Enter, bqStudio updates the selected parameter. The Import button in the Data Memory window
can be clicked in order to import an entire configuration from a specified *.gg.csv file.
Save the configuration to a file by clicking the Export button in the Data Memory window and entering a
file name. The configuration is saved to a *.gg.csv file. The module calibration data is also held in the
bq4050 data memory. If the Gauge Dashboard is not displaying any information, then the bq4050 may not
be supported by the bqStudio version being used, a bqStudio upgrade may be required.

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3.3 Calibration
The bq4050EVM must be calibrated to ensure accurate value reporting. This can be done by going to the
Calibration window in bqStudio (Figure 5).
Figure 5. Calibration Screen
3.3.1 Voltage Calibration
The following list provides information about voltage calibration:
• Measure the voltage from Cell 1 to 1N and enter this value in the Applied Cell 1 Voltage field and
select the Calibrate Voltage box.
• Measure the voltage from BAT+ to BAT– and enter this value in the Applied Battery Voltage field and
select the Calibrate Battery Voltage box.
• Measure the voltage from PACK+ to PACK– and enter this value in the Applied Pack Voltage field and
select the Calibrate Pack Voltage box. If the voltage is not present, turn the charge and discharge
FETs on by pressing the FET_EN button on the Commands panel.
• Press the Calibrate Gas Gauge button to calibrate the voltage measurement system.
• Deselect the Calibrate Voltage boxes after voltage calibration has completed.
3.3.2 Temperature Calibration
The following list provides information about temperature calibration:
• Enter the room temperature in each of the Applied Temperature fields and select the Calibrate box for
each thermistor to be calibrated. The temperature values must be entered in degrees Celsius.
• Press the Calibrate Gas Gauge button to calibrate the temperature measurement system.
• Deselect the Calibrate boxes after temperature calibration has completed.

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3.3.3 Current Calibration
The Board Offset calibration option is not offered in Battery Management Studio, because it is not required
when using the bq4050EVM. The Board Offset calibration option is available in bqProduction.
• Connect and measure a 2-A current source from 1N (–) and Pack– (+) to calibrate without using the
FETs.
• Enter –2000 in the Applied Current field and select the Calibrate Current box.
• Press the Calibrate Gas Gauge button to calibrate.
• Deselect the Calibrate Current box after current calibration has completed.
NOTE: Current can also be calibrated using the FETs. Measure the current in the discharge path
and enter this value in the Applied Current field.
3.4 Setting the CEDV Parameters
To ease evaluation of the bq4050, obtain the CEDV parameters from our online gauging parameter
calculator (GPC) for CEDV gauges tool (www.ti.com/tool/GPCCEDV). After programming the design
parameters to the gauge, the EVM can be used to obtain the experimental data needed to calculate the
CEDV coefficients.
Figure 6. CEDV Coefficients Calculation Flow
The equipment necessary is as follows:
• bqStudio software
• bq4050EVM-561
• Power supply to charge the pack and a load to discharge the pack.
Refer to CEDV Data Collection for Gauging Parameter Calucalator (GPC) (SLUUB45) for a detail
explanation of the CEDV coefficients data collection process and GPC tool configuration.

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3.5 Firmware Screen
Pressing the Firmware button selects the Firmware Update window. This window allows exporting and
importing the device firmware.
Figure 7. Firmware Screen
The upper section of the Firmware screen is used to initialize the device by loading the default .srec into
the flash memory (see Figure 7).
• Search for the .srec file using the Browse button.
• Select the Execute after programming box to automatically return the device to Normal mode after
programming has completed.
• Press the Program button and wait for the download to complete.
3.5.1 Programming the Flash Memory
The lower section of the Firmware screen is used to export all of the flash memory from the device (see
Figure 7).
• Press the Browse button and enter an .srec filename.
• Pressing the Read Srec from device button saves the flash memory contents to the file. Wait for the
download to complete.
3.6 Advanced Comm SMB Screen
Press the Advanced Comm SMB button to select the Advanced SMB Comm window. This tool provides
access to parameters using SMB and Manufacturing Access commands (see Figure 8).