Texas Instruments bq27750EVM User manual

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bq27750EVM 1-Series Li-Ion Battery Pack Manager Evaluation Module
User's Guide
SLUUBP4–June 2017
bq27750EVM 1-Series Li-Ion Battery Pack Manager
Evaluation Module
This evaluation module (EVM) is a complete evaluation system for the bq27750 battery management
system. The EVM includes one bq27750 circuit module and a link to the Microsoft®Windows®based PC
software. The circuit module includes one bq27750 integrated circuit (IC) and all other onboard
components necessary to monitor and predict capacity, monitor critical parameters, protect the battery
from overcharge, over-discharge, short-circuit, and overcurrent in 1-series cell Li-Ion or Li-Polymer battery
packs. The circuit module connects directly across the battery. With the EV2300 or EV2400 interface
board and software, the user can read the bq27750 data registers, program the chipset for different pack
configurations, log cycling data for further evaluation, and evaluate the overall functionality of the solution
under different charge and discharge conditions using I2C communication protocol.
Contents
1 Features....................................................................................................................... 2
1.1 Kit Contents.......................................................................................................... 2
1.2 Ordering Information ............................................................................................... 2
1.3 Documentation ...................................................................................................... 2
1.4 bq27750 Circuit Module Performance Specification Summary............................................... 3
2 bq27750EVM Quick Start Guide........................................................................................... 3
2.1 Items Needed for EVM Setup and Evaluation .................................................................. 3
2.2 Software Installation................................................................................................ 3
2.3 EVM Connections Module Connections ......................................................................... 4
3 Battery Management Studio................................................................................................ 5
3.1 Starting the Program ............................................................................................... 5
3.2 Registers Screen.................................................................................................... 6
3.3 Data Memory Screen............................................................................................... 7
3.4 Calibration Screen.................................................................................................. 7
3.5 Authentication Screen ............................................................................................ 10
3.6 Chemistry Selection............................................................................................... 10
3.7 Programming Screen ............................................................................................. 12
3.8 Advanced Comm Screen......................................................................................... 13
3.9 Golden Image...................................................................................................... 14
3.10 GPC Packager .................................................................................................... 15
3.11 Watch Screen...................................................................................................... 15
3.12 Data Graph Screen ............................................................................................... 16
3.13 Error Screen ....................................................................................................... 16
4 Circuit Module Physical Layouts and Bill of Materials................................................................. 17
4.1 Board Layout....................................................................................................... 17
4.2 Bill of Materials and Schematic.................................................................................. 20
List of Figures
1 bq27750 Circuit Module Connection to Cells and System Load or Charger......................................... 4
2 Registers Screen ............................................................................................................ 5
3 Battery Management Studio Supported Targets ........................................................................ 6
4 Data Memory Screen........................................................................................................ 7
5 Calibration Screen........................................................................................................... 8
6 Authentication Screen ..................................................................................................... 10

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7 Chemistry Screen .......................................................................................................... 11
8 Programming Screen ...................................................................................................... 12
9 Advanced Comm Screen.................................................................................................. 13
10 Golden Image Screen ..................................................................................................... 14
11 GPC Packager Screen .................................................................................................... 15
12 Watch Screen............................................................................................................... 15
13 Data Graph Screen ........................................................................................................ 16
14 Error Screen ................................................................................................................ 16
15 Top Silk Screen............................................................................................................. 17
16 Bottom Silk Screen......................................................................................................... 17
17 Top Assembly............................................................................................................... 18
18 Bottom Assembly........................................................................................................... 18
19 Top Layer ................................................................................................................... 19
20 Bottom Layer................................................................................................................ 19
21 Schematic ................................................................................................................... 22
1 Features
The EVM supports the following features:
• Complete evaluation system for the bq27750EVM 1-series battery pack manager evaluation module
• Populated circuit module for quick setup
• Software that allows data logging for system analysis
1.1 Kit Contents
The following items are supplied with the EVM kit:
• bq27750 circuit module
• Cable to connect the EVM to an EV2300 or EV2400 Communications Interface adapter
1.2 Ordering Information
For complete ordering information, see the product page at www.ti.com.
Table 1. Ordering Information
EVM Part Number Chemistry Configuration Capacity
bq27750EVM Li-Ion 1-cell Any
1.3 Documentation
For information on the bq27750 and bq294502 device firmware and hardware, see the following
documentation:
• bq27750 data sheet (SLUSCM7)
•bq27750 Technical Reference Manual (TRM) (SLUUBI6)

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1.4 bq27750 Circuit Module Performance Specification Summary
This section summarizes the performance specifications of the bq27750 EVM.
Table 2. Performance Specification Summary
Specification MIN TYP MAX Units
Input voltage 1P+ to 1N– 2.5 3.5 25 V
Charge and discharge current 0 2 7 A
2 bq27750EVM Quick Start Guide
This section provides the step-by-step procedures required to use 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 needed for EVM setup and evaluation:
• bq27750 circuit module
• EV2300 or EV2400 communications interface adapter
• Cable to connect the EVM to an EV2300 or EV2400 communications interface adapter
• USB cable to connect the communications interface adapter to the computer
• Computer setup with Microsoft Windows XP, or higher, operating system
• Access to the Internet to download the Battery Management Studio software setup program
• One battery cell
• A DC power supply that can supply 5 V
2.2 Software Installation
Find the latest software version in the bq27750 tool folder on www.ti.com. Use the following steps to install
the bq27750 Battery Management Studio software:
1. Download and run the Battery Management Studio setup program from the Development Tools section
of the bq27750EVM product folder on www.ti.com. See Section 3 for detailed information on using the
tools in the Battery Management Studio.
2. If the Communications Interface Adapter was not previously installed, after the bqStudio installation, a
TI USB DRIVER INSTALLER pops up. Click Yes for the agreement message and follow its
instructions. Two drivers are associated with the EV2300 and an additional file may be required for the
EV2400. Follow the instructions to install both. Do not reboot the computer, even if asked to do so.
3. Plug the communications interface adapter into a USB port using the USB cable. The Windows system
may show a prompt that new hardware has been found. When asked, "Can Windows connect to
Windows Update to search for software?", select "No, not this time", and click Next. In the next dialog
window, it indicates "This wizard helps you install 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 Replace screen. Click No to continue. If this screen does not appear, then go to
the next step. After Windows indicates 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 bq80xx Driver.

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2.3 EVM Connections Module Connections
This section covers the hardware connections for the EVM. See Figure 1.
Figure 1. bq27750 Circuit Module Connection to Cells and System Load or Charger
• Direct connection to the cells: 1N (BAT–), 1P (BAT+)
Attach the cells to the J2 terminal block. A specific connection sequence is not required, but it is a
good practice to start with the BAT– of the battery before the BAT+. A power supply set at 4 V can be
used instead of a battery for evaluation purposes.
• I2C™ (SDA, SCL)
Attach the communications interface adapter cable to J3 and to the I2C port on the EV2300.
NOTE: If the EVM board is an E1 revision, it will only work with an EV2400. If it is an A revision, the
EV2300 can be used. Ensure that shunts are placed on P2 and P3 jumpers to enable the
onboard pullup resistors. If the EV2400 is used, there will be no need for shunts on P2 and
P3 because it has internal pullup resistors.
• System load and charger connections across Charger+/Load+ and Charger-/Load-
Attach the load to the J1 terminal block. The positive terminal of the load should be connected to the
terminal block position labeled PACK+. The ground wire for the load should be connected to the other
terminal block position labeled Charger-/Load-.
• Wake-up the device up from SHUTDOWN (WAKE)
Press the Wake pushbutton switch S1 to temporarily connect 1P to Charger+/Load+. This applies
voltage to the PACK pin on the bq27750 to power-up the regulators and start the initialization
sequence.
• Parameter setup
Data flash parameters should be updated to fine tune the gauge to the pack. See the bq27750
Technical Reference Manual (SLUUBI6) for help with setting the parameters.

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3 Battery Management Studio
3.1 Starting the Program
Run Battery Management Studio from the Start | Programs | Texas Instruments | Battery Management
Studio sequence or the Battery Management Studio shortcut. As long as the device has been woken up
from shutdown mode by momentarily pressing button S1 or applying a charger voltage, the gauge will be
automatically detected and the register screen will appear as seen in Figure 2. If your device contains an
earlier firmware version, then auto detection of the device may not occur. If that happens, on the window
that pops up as shown in Figure 3, select any bq27750.bqz file. This action will enable the program to get
started and the user can update the firmware using the latest .srec file for the device downloadable from
the product folder of the gauge at www.ti.com.
Figure 2. Registers Screen

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Figure 3. Battery Management Studio Supported Targets
3.2 Registers Screen
The Registers section contains parameters used to monitor gauging. The Bit Registers section provides
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). A greyed-out bit indicates that the bit is reserved. Data begins to
appear once the Refresh (single-time scan) button is selected, or it scans continuously if the Scan button
is selected. The continuous scanning period can be set via the | Windows | Preferences | Register
selections.

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The Battery Management Studio program provides a logging function which logs all the values of the
parameters in the Register section if running the program in “Show basic view mode”. To selectively
choose the parameters of the Register section that are scanned and logged, set Battery Management
Studio to “Show Advanced view mode”. This mode can be set via | Windows | Preferences | All Global
Settings| Show Advanced Views. Uncheck the fields that are not needed to be scanned or logged. To
enable logging, select the Log button; this causes the Scan button to be selected. When logging is
stopped, the Scan button is still selected and has to be manually deselected.
3.3 Data Memory Screen
The bq27750 data flash comes configured per the default settings detailed in the bq27750 TRM. Ensure
that the settings are correctly changed to match the pack and application for the solution being evaluated.
For ease of configuration, a text file with a gg.csv extension can be extracted, modified, and imported back
on the device. Use the export and import buttons as seen in Figure 4 to export and import gg.csv files.
The auto export button enables gg files to be exported periodically at intervals. This is useful when
debugging issues with the gauge. A Write All command is necessary if a gg.csv file is imported to ensure
that all the changes made on the gg.csv file are effected on the gauge. The Read All command is used to
read back all of the data written to the gauge so that the changes made can be verified. The Filter/Search
field enables the user to search for a particular parameter in the data memory content.
NOTE: Do not make modifications to the gg.csv file using Microsoft Excel®as it makes changes to
file, which bqStudio rejects. Make sure to use a text editor like Notepad or similar to edit a
gg.csv file.
Figure 4. Data Memory Screen
3.4 Calibration Screen
The voltages, temperatures, and currents should be calibrated to provide good gauging performance.
Press the Calibration button while in the “Show Advanced view mode” to select the Advanced
Calibration window, see Figure 5. If in the “Show basic view mode”, the basic calibration window shows
when the Calibration button is clicked. The Advanced Calibration window enables the internal
temperature sensor as well as the external thermistor to be calibrated.

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Figure 5. Calibration Screen
3.4.1 Voltage Calibration
• Measure the voltage from 1N to 1P and enter this value in the Applied Cell 1 Voltage field and Applied
Battery Voltage, then select the Calibrate Voltage and calibrate battery voltage checkboxes.
• Measure the voltage from Charger+/Load+ to Charger-/Load- and enter this value in the Applied Pack
Voltage field and select the Calibrate Pack Voltage box. If the voltage is not present, then turn the
charge and discharge FETs on by entering a 0x22 command in the Manufacturer Access register on
the Register screen.
• Press the Calibrate Gas Gauge button to calibrate the voltage measurement system.
• Deselect the Calibrate Voltage boxes after voltage calibration has completed.
3.4.2 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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3.4.3 Current Calibration
The Board Offset Calibration option is not offered in Battery Management Studio, because it is not
required when using the bq27750EVM. The Board Offset Calibration option is available in bqProduction.
• Connect and measure a 2-A current source from 1N (–) and Charger-/Load- to calibrate without using
the FETs. (TI does not recommend calibration 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.

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3.5 Authentication Screen
The bq27750 supports SHA-1 HMAC authentication with the host system. The authentication screen of
bqStudio allows for the SHA-1 calculator to be tested, perform gauge authentication by the host and
change the gauge authentication key.
Figure 6. Authentication Screen
3.6 Chemistry Selection
The chemistry file contains parameters that the simulations use to model the cell and its operating profile.
It is critical to program a Chemistry ID that matches the cell into the device. Some of these parameters
can be viewed in the Data Flash section of the Battery Management Studio.
Press the Chemistry button to select the Chemistry window.
• The table can be sorted by clicking the desired column. For example: Click the Chemistry ID column
header.
• Select the Chemistry ID that matches your cell from the table (see Figure 7).
• Press Update Chemistry from Database to update the chemistry in the device.

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Figure 7. Chemistry Screen

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3.7 Programming Screen
Press the Programming button to select the Programming window. This window allows the user to
program the device firmware. Use the following procedures to program the device:
• Search for the .srec file using the Browse button.
• Press the Program button and wait for the download to complete.
• Click the Execute FW to return the device to NORMAL mode after programming has completed, see
Figure 8.
Figure 8. Programming Screen

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3.8 Advanced Comm Screen
Press the Advanced Comm button to select the Advanced Comm window. This tool provides access to
parameters using I2C and Manufacturing Access commands, see Figure 9. The transaction log screen
shows the history of sent commands.
NOTE: I2C commands are sent in Little-Endian format.
Figure 9. Advanced Comm Screen
Examples:
Reading an I2C Command.
• Read chemical ID (0x 0006).
– Write to mac address 3e Command 06 00 (see Figure 9)
– Read 4 bytes.
– The result returned is 10 12, which is little endian for chem id 1210.
Sending a MAC Gauging() to enable IT via ManufacturerAccess().
• With Impedance Track™ disabled, send Gauging() (0x0021) to ManufacturerAccess().
– Write to mac address 3e command 21 00 (see Figure 9).

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3.9 Golden Image
The golden image screen allows for the creation of a golden file to be used to program multiple devices. A
flash stream file (.bqfs, .dffs or .gmfs) can be extracted by:
• Browsing to the desired location
• Creating a file name in the Base File Name field
• Checking the corresponding checkbox for the file that needs to be created
• Clicking the options button next to the fields, additional checkboxes pop up that allow additions such as
the unseal codes, ROM command, and so forth, to the golden files, as needed
• Clicking the Create Image Files button, seeFigure 10
Figure 10. Golden Image Screen

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3.10 GPC Packager
This allows the creation of a file package to be uploaded to the Gauge Parameter Calculator Packager
(gpc) tool on www.ti.com. Click on the gpc packager help for guidance on usage, see Figure 11
Figure 11. GPC Packager Screen
.
3.11 Watch Screen
This enables monitoring of specific registers and data memory items at user-specified time intervals. By
clicking the Add Register or Add Data Memory Item, these will be added to the table of values to be
tracked.
Figure 12. Watch Screen

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3.12 Data Graph Screen
This enables specified registers and data memory items to be plotted in a graph in real time based on a
specific time interval chosen as shown in Figure 13.
Figure 13. Data Graph Screen
3.13 Error Screen
This keeps track of any error that may occur with bqStudio during usage.
Figure 14. Error Screen

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4 Circuit Module Physical Layouts and Bill of Materials
This section contains the printed-circuit board (PCB) layout, assembly drawings, bill of materials (BOM),
and schematic for the bq27750 circuit module.
4.1 Board Layout
Figure 15 through Figure 20 illustrate the PCB layers and assembly drawings for the bq27750 module.
Figure 15. Top Silk Screen
Figure 16. Bottom Silk Screen

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Figure 17. Top Assembly
Figure 18. Bottom Assembly

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Figure 19. Top Layer
Figure 20. Bottom Layer

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4.2 Bill of Materials and Schematic
Table 3 lists the EVM BOM.
Table 3. Bill of Materials
Designator Qty Value Description Package Reference Part Number Manufacturer
!PCB1 1 Printed Circuit Board PWR837 Any
C1, C2, C3, C4, C5, C8 6 0.1uF CAP, CERM, 0.1 µF, 6.3 V, +/- 10%, X5R, 0402 0402 GRM155R60J104KA01D Murata
C6 1 2.2uF CAP, CERM, 2.2 µF, 6.3 V, +/- 10%, X5R, 0402 0402 GRM155R60J225KE95D Murata
J1 1 Terminal Block, 3.5 mm, 2x1, Tin, TH Terminal Block, 3.5 mm,
2x1, TH 39357-0002 Molex
J2 1 Terminal Block, 3.5 mm, 3x1, Tin, TH Terminal Block, 3.5 mm,
3x1, TH 39357-0003 Molex
J3 1 Header (friction lock), 100mil, 4x1, R/A, TH 4x1 R/A Header 22-05-3041 Molex
JP1, JP3, JP4, JP5 4 Header, 100mil, 2x1, Tin, TH Header, 2 PIN, 100mil, Tin PEC02SAAN Sullins Connector Solutions
LBL1 1 Thermal Transfer Printable Labels, 0.650" W x 0.200" H - 10,000 per
roll PCB Label 0.650"H x 0.200"W THT-14-423-10 Brady
Q1 1 30V MOSFET, 2-CH, N-CH, 30 V, A, YJG0010A (PICOSTAR-10) YJG0010A CSD87501L Texas Instruments
Q2 1 60V MOSFET, N-CH, 60 V, 0.31 A, SOT-323 SOT-323 2N7002KW Fairchild Semiconductor
R1 1 1.0k RES, 1.0 k, 5%, 0.063 W, 0402 0402 CRCW04021K00JNED Vishay-Dale
R2 1 10k RES, 10 k, 5%, 0.063 W, 0402 0402 CRCW040210K0JNED Vishay-Dale
R3, R4 2 10Meg RES, 10 M, 5%, 0.063 W, 0402 0402 CRCW040210M0JNED Vishay-Dale
R5 1 10.0 RES, 10.0, 0.1%, 0.063 W, 0402 0402 CPF0402B10RE1 TE Connectivity
R6, R7, R10, R11 4 5.1k RES, 5.1 k, 5%, 0.063 W, 0402 0402 CRCW04025K10JNED Vishay-Dale
R8 1 0 RES, 0, 5%, 0.063 W, 0402 0402 CRCW04020000Z0ED Vishay-Dale
R12, R13, R14, R15 4 100 RES, 100, 1%, 0.063 W, 0402 0402 CRCW0402100RFKED Vishay-Dale
R16 1 0.001 RES, 0.001, 1%, 1 W, AEC-Q200 Grade 0, 1206 1206 CSNL1206FT1L00 Stackpole Electronics Inc
RT1 1 10.0k ohm Thermistor NTC, 10.0k ohm, 1%, Disc, 5x8.4 mm Disc, 5x8.4 mm 103AT-2 SEMITEC Corporation
S1 1 Switch, SPST-NO, Off-Mom, 0.05A, 12VDC, SMD 3.9x2.9mm PTS820 J20M SMTR LFS C&K Components
SH-JP1, SH-JP3, SH-
JP4 3 1x2 Shunt, 100mil, Gold plated, Black Shunt 969102-0000-DA 3M
TP1, TP2 2 Test Point, Miniature, Red, TH Red Miniature Testpoint 5000 Keystone
TP3, TP4, TP5, TP6,
TP8, TP9 6 Test Point, Miniature, Black, TH Black Miniature Testpoint 5001 Keystone
U1 1 1-Cell to 2-Series Cell Programmable Battery Manager, DRZ0012A
(VSON-12) DRZ0012A BQ27750DRZR Texas Instruments
U2, U3 2 ESD in 0402 Package with 10 pF Capacitance and 6 V Breakdown, 1
Channel, -40 to +125 degC, 2-pin X2SON (DPY), Green (RoHS & no
Sb/Br)
DPY0002A TPD1E10B06DPYR Texas Instruments
W1 1 Cable assembly, 4 pin Edge # 6575051 N/A SMBUS CBL002 Any
C7 0 1uF CAP, CERM, 1 µF, 35 V, +/- 10%, X5R, 0402 0402 GRM155R6YA105KE11D Murata
C9, C10 0 0.1uF CAP, CERM, 0.1 µF, 6.3 V, +/- 10%, X5R, 0402 0402 GRM155R60J104KA01D Murata