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User’s Guide
BQ27427 EVM: Single-Cell Impedance Track Technology
ABSTRACT
This evaluation module (EVM) is a complete evaluation system for the BQ27427. The EVM includes one
BQ27427 circuit module with an integrated current-sense resistor. A separated orderable EV2400 PC interface
board for gas gauge interface along with a PC USB cable, and Microsoft® Windows® based PC software is
needed when using this EVM. The circuit module includes one BQ27427 integrated circuit and all other onboard
components necessary to monitor and predict capacity for a system-side fuel gauge solution. The circuit module
connected with the EV2400 interface board and software, the user can:
•
•
•
•
Read the BQ27427 data registers
Update the RAM for different configurations
Log cycling data for further evaluation
Evaluate the overall functionality of the BQ27427 solution under different charge and discharge conditions
The latest Windows-based PC software can be downloaded from the product folder on the Texas Instruments
Web site.
Table of Contents
1 Features...................................................................................................................................................................................3
1.1 Kit Contents........................................................................................................................................................................3
1.2 Ordering Information.......................................................................................................................................................... 3
2 BQ27427-Based Circuit Module............................................................................................................................................ 4
2.1 Circuit Module Connections............................................................................................................................................... 4
2.2 Pin Descriptions................................................................................................................................................................. 4
3 Evaluation Module Physical Layout, Bill of Materials and Schematic...............................................................................5
3.1 Board Layout......................................................................................................................................................................5
3.2 Bill of Materials...................................................................................................................................................................6
3.3 Schematic.......................................................................................................................................................................... 7
3.4 BQ27427 Circuits Module Performance Specification Summary.......................................................................................7
4 EVM Hardware and Software Setup...................................................................................................................................... 8
4.1 Software Installation...........................................................................................................................................................8
5 Troubleshooting Unexpected Dialog Boxes.........................................................................................................................8
6 Hardware Connection.............................................................................................................................................................8
6.1 Connecting the BQ27427 Circuit Module to a Battery Pack.............................................................................................. 8
6.2 PC Interface Connection.................................................................................................................................................... 8
7 Operation...............................................................................................................................................................................10
7.1 Starting the Program........................................................................................................................................................ 10
7.2 Setting Programmable BQ27427 Options........................................................................................................................ 11
8 Calibration............................................................................................................................................................................. 13
8.1 Calibrating the BQ27427..................................................................................................................................................13
8.2 Voltage Calibration........................................................................................................................................................... 13
8.3 Board Offset Calibration................................................................................................................................................... 13
9 Advanced Communication I2C............................................................................................................................................ 14
9.1 I2C Communication.......................................................................................................................................................... 14
10 Related Documentation......................................................................................................................................................16
11 Revision History..................................................................................................................................................................16
List of Figures
Figure 3-1. BQ27427EVM Layout – Top Silk............................................................................................................................... 5
Figure 3-2. BQ27427EVM Layout - Mid Layer 2..........................................................................................................................5
Figure 3-3. BQ27427EVM Layout – Mid Layer 3.........................................................................................................................6
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Trademarks
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Figure 3-4. BQ27427EVM Layout – Bottom Layer...................................................................................................................... 6
Figure 3-5. BQ27427EVM Schematic..........................................................................................................................................7
Figure 6-1. BQ27427 Circuit Module Connection to Pack and System Load/Charger................................................................ 8
Figure 7-1. Registers Screen.....................................................................................................................................................10
Figure 7-2. bqStudio Default Page.............................................................................................................................................11
Figure 7-3. Data Memory Screen.............................................................................................................................................. 12
Figure 8-1. Calibration Screen...................................................................................................................................................13
Figure 9-1. Advanced Communication I2C................................................................................................................................ 14
Figure 9-2. Parameter Q&A Screen...........................................................................................................................................14
Figure 9-3. Golden Image Output Screen..................................................................................................................................15
Figure 9-4. Gauge Programming Screen...................................................................................................................................15
List of Tables
Table 1-1. Ordering Information................................................................................................................................................... 3
Table 2-1. Pin Descriptions.......................................................................................................................................................... 4
Table 3-1. Bill of Materials............................................................................................................................................................6
Table 3-2. Performance Specification Summary..........................................................................................................................8
Table 6-1. Circuit Module to EV2400 Connections...................................................................................................................... 9
Trademarks
Impedance Track™ is a trademark of Texas Instruments.
Microsoft® and Windows® are registered trademarks of Microsoft Corporation.
All trademarks are the property of their respective owners.
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Features
1 Features
•
•
•
•
Complete evaluation system for the BQ27427 gas gauge with Impedance Track™ technology
Populated circuit module for quick setup
Personal computer (PC) software and interface board for easy evaluation
Software that allows data logging for system analysis
1.1 Kit Contents
•
BQ27427 evaluation module (BMS037)
This EVM is used for the evaluation of the BQ27427 battery gauge. Visit the product Web folder at www.ti.com
and download the TRM for information how to configure the BQ27427.
1.2 Ordering Information
Table 1-1. Ordering Information
Part Number
EVM Part Number
BQ27427
BQ27427EVM
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BQ27427-Based Circuit Module
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2 BQ27427-Based Circuit Module
The BQ27427-based circuit module is a complete and compact example solution of a BQ27427 circuit for
battery management. The circuit module incorporates a BQ27427 battery gas gauge integrated circuit (IC) with
integrated sense resistor and all other components necessary to accurately predict the capacity of a 1-series
Li-ion cell.
2.1 Circuit Module Connections
Contacts on the circuit module provide the following connections:
•
•
•
•
•
Direct connection to the battery pack (J5): PACK+, PACK–
To the serial communications port (J10): SDA, SCL, and VSS
The system load and charger connect across charger and load (J6 and J7): CHARGER+/LOAD+ and
CHARGER–/LOAD–.
Access to signal outputs (J1 and J5): BIN and GPOUT
External connect to power the IC (J4): EXT VDD and VSS
2.2 Pin Descriptions
Table 2-1. Pin Descriptions
4
Pin Name
Description
PACK+
Pack positive terminal
PACK–
Pack negative terminal
SDA
I2C communication data lin
EXT VDD
External supply connection
SCL
I2C communication clock line
VSS
Signal return for communication line, shared with charger and ground
CHARGER+/LOAD+
High potential of load or charger connection
CHARGER–/LOAD–
Low potential of load or charger connection (system VSS)
BIN
Battery insertion detection input
GPOUT
General purpose output
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Evaluation Module Physical Layout, Bill of Materials and Schematic
3 Evaluation Module Physical Layout, Bill of Materials and Schematic
This section contains the board layout, bill of materials, and schematic for the BQ27427 evaluation module.
3.1 Board Layout
This section shows the printed-circuit board (PCB) layers (Figure 3-1 through Figure 3-4), and assembly drawing
for the BQ27427 module.
Figure 3-1. BQ27427EVM Layout – Top Silk
Figure 3-2. BQ27427EVM Layout - Mid Layer 2
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Evaluation Module Physical Layout, Bill of Materials and Schematic
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Figure 3-3. BQ27427EVM Layout – Mid Layer 3
Figure 3-4. BQ27427EVM Layout – Bottom Layer
3.2 Bill of Materials
Table 3-1. Bill of Materials
6
Count
RefDes
Value
Description
Size
1
C1
0.47
Capacitor,
Ceramic, 6.3V,
X5R, 20%
0402
1
C2
1
Capacitor,
Ceramic, 6.3V,
X5R, 10%
0402
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Part Number
Mfr
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Evaluation Module Physical Layout, Bill of Materials and Schematic
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Table 3-1. Bill of Materials (continued)
Count
RefDes
Value
Description
4
J1,J4,J6,J7
ED555/2DS
4
J2,J3,J8,J9
1
Part Number
Mfr
Terminal Block, 2- 0.27 x 0.25 inch
pin, 6-A, 3.5mm
ED555/2DS
OST
PEC36SAAN
Header, Male
3-pin, 100mil
spacing
PEC36SAAN
Sullins
J5
ED555/3DS
Terminal Block, 3- 0.41 x 0.25 inch
pin, 6-A, 3.5mm
ED555/3DS
OST
1
J10
22-05-3041
Header, Friction
Lock Ass'y, 4-pin
Right Angle
0.400 x 0.500
22-05-3041
Molex
1
R1
14.7k
Resistor, Chip,
1/16-W, 5%
0402
Std
Std
1
R2
10k
Resistor, Chip,
1/16-W, 5%
0402
Std
Std
2
R3,R4
5.1k
Resistor, Chip,
1/16-W, 5%
0402
Std
Std
4
TP1,TP7,TP9
5001
Test Point, Black,
Thru Hole Color
Keyed
0.100 x 0.100 inch 5001
Keystone
7
TP2,TP3,TP11,TP 5002
12
Test Point, White,
Thru Hole Color
Keyed
0.100 x 0.100 inch 5002
Keystone
3
TP4,TP5,T6,TP10 5000
Test Point, Red,
Thru Hole Color
Keyed
0.100 x 0.100 inch 5000
Keystone
1
U1
IC, Battery Gauge DSBGA
BQ27427YZF
Size
0.100 inch x 3
BQ27427
TI
3.3 Schematic
Figure 3-5. BQ27427EVM Schematic
3.4 BQ27427 Circuits Module Performance Specification Summary
This section summarizes the performance specifications of the BQ27427 circuit module.
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EVM Hardware and Software Setup
Table 3-2. Performance Specification Summary
Specification
Min
Typ
Max
Units
Input voltage Pack+ to Pack–
2.7
3.6
4.3
V
Charge and discharge current
0
1
2.5
A
4 EVM Hardware and Software Setup
This section describes how to install the BQ27427EVM PC software and how to connect the different
components of the EVM.
4.1 Software Installation
Find the latest software version at https://www.ti.com/tool/bqStudio. Use the following steps to install Battery
Management Studio:
1.
2.
3.
4.
5.
6.
Ensure that the EV2400 is not connected to the PC through a USB cable before starting this procedure.
Select the Tool and Software tab in the product folder
Under the Software section, click on Battery Management Studio (bqStudio) Software Suite.
Click the Download button to download the software.
Download software to hard drive.
Double-click the software executable and follow all instructions and prompts.
5 Troubleshooting Unexpected Dialog Boxes
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 the operating system.
6 Hardware Connection
The BQ27427 evaluation system comprises three hardware components: the BQ27427 evaluation module, the
EV2300 or EV2400 PC interface board, and the PC.
6.1 Connecting the BQ27427 Circuit Module to a Battery Pack
USB
EV2300 or EV2400
CHARGER
SMB I2C HDQ
Figure 6-1 shows how to connect the BQ27427 circuit module to the cells and system load/charger.
LOAD
Battery
Pack
Figure 6-1. BQ27427 Circuit Module Connection to Pack and System Load/Charger
6.2 PC Interface Connection
The following steps configure the hardware for interface to the PC.
1. Connect the BQ27427-based EVM to the EV2400 using wire leads as shown in Table 6-1.
2. Connect the PC USB cable to the EV2400 and the PC USB port.
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Hardware Connection
Table 6-1. Circuit Module to EV2400 Connections
BQ27427EVM
EV2400
SDA
SDA
SCL
SCL
VSS
GND/VSS
The BQ27427EVM is now set up for operation.
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Operation
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7 Operation
This section details the operation of the bqStudio software.
7.1 Starting the Program
Run bqStudio from the Start | All Programs | Texas Instruments | Battery Management Studio. The main screen
(Figure 7-1) appears. If instead of Figure 7-1 appearing, Figure 7-2 appears, it may mean that the EVM is
not connected to the computer correctly. Make sure that the USB interface (EV2400) and the BQ27427 are
connected and restart bqStudio. If this still does not resolve the issue, check if the I2C pullup resistors are
connected. Data begins to appear once the (single-time scan) button is clicked, or when the Scan
button is clicked. To disable the scan feature, simply click the Scan button again.
The continuous scanning period can be set by opening Window | Preferences → Registers section. The range
for this interval is 0 ms to 65,535 ms. Only items that are selected for scanning are scanned within this period.
Battery Management Studio provides a logging function which logs the values that were last scanned. To enable
this function, select the Start Log button; this causes the Scan button to be pressed. When logging is Stopped,
the Scan button will still be selected and has to be manually clicked again.
Figure 7-1. Registers Screen
Figure 7-1 shows the main bqStudio window. Additional Flag and Status data can be viewed at the bottom of the
Registers window.
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Operation
Figure 7-2. bqStudio Default Page
7.2 Setting Programmable BQ27427 Options
The BQ27427 data memory comes configured per the default settings detailed in the BQ27427 technical
reference manual (SLUUAC5). Ensure that the settings are correctly changed to match the pack and application
for the BQ27427 solution being evaluated.
IMPORTANT: The correct setting of these options is essential to get the best performance. The settings can be
configured using the Data Memory screen (Figure 7-3).
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Operation
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Figure 7-3. Data Memory Screen
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 BQ27427 data
memory. If the Gauge Dashboard is not displaying any information, then the BQ27427 may not be supported by
the bqStudio version being used, a bqStudio upgrade may be required.
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Calibration
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8 Calibration
The BQ27427EVM must be calibrated to ensure accurate value reporting. This is done using the Calibration
window in bqStudio (Figure 8-1).
8.1 Calibrating the BQ27427
1. Select the types of calibration to be performed (see Figure 8-1).
2. Enter the measured values for the types selected.
3. Press the button to calibrate.
8.2 Voltage Calibration
Voltage calibration usually is not required. If needed, follow these steps:
1. Measure the voltage across Pack+ and Pack–.
2. Type the voltage value in mV into Enter measured value.
3. Press the Calibrate button.
8.3 Board Offset Calibration
This performs the offset calibration for the current offset of the board.
It is expected that no current is flowing through the sense resistor while performing this calibration step.
1. Remove load and short PACK– to LOAD–.
2. Press the Calibrate button
Figure 8-1. Calibration Screen
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Advanced Communication I2C
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9 Advanced Communication I2C
9.1 I2C Communication
I2C read/write operations serve as general-purpose communication tools (Figure 9-1).
Figure 9-1. Advanced Communication I2C
Figure 9-2. Parameter Q&A Screen
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Advanced Communication I2C
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Figure 9-3. Golden Image Output Screen
Figure 9-4. Gauge Programming Screen
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Related Documentation
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10 Related Documentation
BQ27427 System-Side Impedance Track™ Fuel Gauge with Integrated Sense Resistor data sheet
11 Revision History
DATE
May 2021
16
REVISION
*
NOTES
Initial Release
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