National Semiconductor bq27411 User manual

1
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bq27411 EVM: System-Side Impedance Track™ Technology
Impedance Track is a trademark of Texas Instruments.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
User's Guide
SLUUAP3A–January 2014–Revised July 2016
bq27411 EVM: System-Side Impedance Track™
Technology
This evaluation module (EVM) is a complete evaluation system for the bq27411 fuel gauge. The EVM
includes one bq27411 circuit module with a current-sense resistor. A separate orderable EV2300 or
EV2400 PC interface board for fuel 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 bq27411 integrated
circuit and all other onboard components necessary to monitor and predict capacity for a pack-side fuel
gauge solution. The circuit module connects directly across the battery cell. With the EV2300 or EV2400
interface board and software, the user can:
• Read the bq27411 data registers
• Update the RAM for different configurations
• Log cycling data for further evaluation
• Evaluate the overall functionality of the bq27411 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.
Contents
1 Features....................................................................................................................... 2
1.1 Kit Contents.......................................................................................................... 2
1.2 Ordering Information ............................................................................................... 2
2 bq27411-Based Circuit Module ............................................................................................ 3
2.1 Circuit Module Connections ....................................................................................... 3
2.2 Pin Description...................................................................................................... 3
3 Circuit Module Physical Layout, Bill of Materials and Schematic...................................................... 3
3.1 Board Layout ........................................................................................................ 3
3.2 Bill of Materials...................................................................................................... 5
3.3 Schematic............................................................................................................ 6
3.4 bq27411 Circuits Module Performance Specification Summary.............................................. 6
4 EVM Hardware and Software Setup ...................................................................................... 6
4.1 Software Installation................................................................................................ 7
5 Troubleshooting Unexpected Dialog Boxes.............................................................................. 7
6 Hardware Connection ....................................................................................................... 7
6.1 Connecting the bq27411 Circuit Module to a Battery Pack ................................................... 7
6.2 PC Interface Connection........................................................................................... 8
7 Operation ..................................................................................................................... 8
7.1 Starting the Program ............................................................................................... 8
7.2 Setting Programmable bq27411 Options ...................................................................... 10
8 Calibration................................................................................................................... 12
8.1 Calibrating the bq27411 ......................................................................................... 12
8.2 Voltage Calibration................................................................................................ 12
8.3 Board Offset Calibration.......................................................................................... 12
9 Related Documentation from Texas Instruments ...................................................................... 13
List of Figures

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1 bq27411EVM Layout – Top Silk........................................................................................... 3
2 bq27411EVM Layout - Top Layer ........................................................................................ 4
3 bq27411EVM Layout – Bottom Layer..................................................................................... 4
4 bq27411EVM Schematic ................................................................................................... 6
5 bq27411 Circuit Module Connection to Pack and System Load/Charger............................................ 7
6 Registers Screen ............................................................................................................ 9
7 bqStudio Default Page..................................................................................................... 10
8 Data Memory Screen...................................................................................................... 11
9 Calibration Screen.......................................................................................................... 12
List of Tables
1 Ordering Information ........................................................................................................ 2
2 Bill of Materials............................................................................................................... 5
3 Performance Specification Summary ..................................................................................... 6
4 Circuit Module to EV2300 or EV2400 Connections ..................................................................... 8
1 Features
• Complete evaluation system for the bq27411 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
• bq27411 circuit module (PWR544)
This EVM is used for the evaluation of bq27411 fuel gauge. Visit the product Web folder at www.ti.com to
properly configure the bq27411 fuel gauge.
1.2 Ordering Information
(1) Using the FW_VERSION (0x0002) Control() subcommand returns 0x0109. See SLUSBN7,bq27411-G1x System-Side
Impedance Track™ Fuel Gauge, data sheet for information on Control() subcommands.
(2) Using the CHEM_ID (0x0008) Control() subcommand helps to differentiate between the bq27411-G1A (returns 0x0128), the
bq27411-G1B (returns 0x0312), and the bq27411-G1C (returns 0x0354). See SLUSBN7,bq27411-G1x System-Side Impedance
Track™ Fuel Gauge, data sheet for information on Control() subcommands.
Table 1. Ordering Information
Part Number EVM Part Number Firmware Version (1) Chemistry Chemistry ID (2) Configuration
bq27411-G1A bq27411EVM-G1A v1.09 (0x0109) 4.2 V Li-ion 128 1 cell
bq27411-G1B bq27411EVM-G1B v1.09 (0x0109) 4.3 V Li-ion 312 1 cell
bq27411-G1C bq27411EVM-G1C v1.09 (0x0109) 4.35 V Li-ion 354 1 cell

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2 bq27411-Based Circuit Module
The bq27411-based circuit module is a complete and compact example solution of a bq27411 circuit for
battery management. The circuit module incorporates a bq27411 battery fuel gauge integrated circuit (IC)
with 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 cell (J1): CELL+, CELL–
• The serial communications port (J3): SDA, SCL, and VSS
• The load and charger connect across pack connector (J2): PACKP and PACKN
• Access to the programming pin (J7): EXTPROG and VSS
• External connect to I2C pullup voltage (J4): EXTPU and VSS
2.2 Pin Description
Pin Name Description
PACK+ Charger/load positive terminal
PACK– Charger/load negative terminal
SDA I2C communication data line
EXTPU External I2C pullup connection
SCL I2C communication clock line
VSS Signal return for communication line, shared with charger and ground
CELLP Cell positive terminal
CELLN Cell negative terminal
EXTPROG Power connection for OTP programming
3 Circuit Module Physical Layout, Bill of Materials and Schematic
This section contains the board layout, bill of materials, and schematic for the bq27411 circuit module.
3.1 Board Layout
This section shows the printed-circuit board (PCB) layers (Figure 1 through Figure 3), and assembly
drawing for the bq27411 module.
Figure 1. bq27411EVM Layout – Top Silk

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Figure 2. bq27411EVM Layout - Top Layer
Figure 3. bq27411EVM Layout – Bottom Layer

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3.2 Bill of Materials
Table 2. Bill of Materials
Designator Quantity Value Description Package
Reference Part Number Manufacturer
PCB 1 Printed Circuit Board PWR544 Any
C1 1 0.47 µF Capacitor, Ceramic Chip, 10V, X5R, ±10% 402 C1005X5R1A474K050BB TDK
C2 1 1.0 µF Capacitor, Ceramic Chip, 16V, X5R, ±10% 402 C1005X5R1C105K050BC TDK
C3 1 1 µF Capacitor, CERM, 1µF, 10V, ±10%, X5R, 0402 0402 GRM155R61A105KE15D MuRata
C4, C5 2 150 pF Capacitor, CERM, 150pF, 50V, ±5%, C0G/NP0,
0402 0402 GRM1555C1H151JA01D MuRata
D1 1 Red LED, Red, SMD LED_0805 LTST-C170KRKT Lite-On
J1, J2, J4,
J7 4 ED555/2DS Terminal Block, 2-pin, 6-A, 3.5mm 0.27 x 0.25 inch ED555/2DS OST
J3 1 22-05-3041 Header, Friction Lock Ass'y, 4-pin Right Angle 0.400 x
0.500 inch 22-05-3041 Molex
J5, J6 2 PEC03SAAN Header, Male 3-pin, 100mil spacing 0.100 inch x
3PEC03SAAN Sullins
J8 1 PEC02SAAN Header, Male 2-pin, 100mil spacing 0.100 inch x
2PEC02SAAN Sullins
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
R1 1 0.010 Resistor, Power Metal Strip, 0.25W, 1% 805 WSL0805R0100FEA1 Vishay
R2, R3 2 5.1 kΩResistor, 5.1 kΩ, 5%, 0.063W, 0402 0402 CRCW04025K10JNED Vishay-Dale
R4, R6, R9 3 1.00 MΩResistor, 1.00 MΩ, 1%, 0.063W, 0402 0402 CRCW04021M00FKED Vishay-Dale
R5 1 510 Resistor, 510 Ω, 5%, 0.063W, 0402 0402 CRCW0402510RJNED Vishay-Dale
R7, R8 2 300 Resistor, 300 Ω, 5%, 0.063W, 0402 0402 CRCW0402300RJNED Vishay-Dale
R10, R11 2 100 Resistor, 100 Ω, 1%, 0.063W, 0402 0402 CRCW0402100RFKED Vishay-Dale
SH-J5,
SH-J6,
SH-J8
3 1x2 Shunt, 100mil, Gold plated, Black Shunt 969102-0000-DA 3M
TP1, TP5,
TP11 3 5001 Test Point, Black, Thru Hole Color Keyed 0.100 x 0.100 inch 5001 Keystone
TP2, TP4,
TP6, TP9,
TP10
5 5000 Test Point, Red, Thru Hole Color Keyed 0.100 x
0.100 inch 5000 Keystone
TP3, TP7,
TP8 3 5002 Test Point, White, Thru Hole Color Keyed 0.100 x 0.100 inch 5002 Keystone
U1 1 BQ27411DRZ-
G1x IC, Single-Cell Impedance Track Gas Gauge QFN12 BQ27411DRZ-G1x TI

TP9
1 2
J4
VSS
VDD
PGND
1 2 3
J5
1 2 3
J6
VDD
PROG
EXTPU
TP3
TEST
TP7
TP8
SDA
SCL
1 2 3 4
J3
1 2
J7
SDA
1
SCL
2
VSS
3
NC
4
VDD
5
BAT
6SRN 7
SRP 8
NC 9
TEST 10
NC 11
PROG 12
PWPD
13
U1
BQ27411DRZ
ENABLE
SDA
TP11
SCL
PROG
VSS
PGND
VDD
TP4
VDD
0.47uF
C1
PGND PGND
TP10
1
2
J2
TP6TP2
0.010
R1
CELLP
PACKN
1.0uF
C2
CELLN
1
2
J1
TP5TP1
PGND
1
2
J8
100
R10
510
R5
5.1k
R2
5.1k
R3
1.00Meg
R4
CELLP
VSS VSS VSS
PACKP
PACKP
PGND
1µF
C3
PGND
Red
D1
PGND
Optional: Requires ~20mA Extra Supply Current.
VDD
EXTPU
VDD
PGND
SDA
SCL
VOUT
Optional ESD Filter
VSS
EXTPROG
100
R11
300
R7
300
R8
1.00Meg
R9
150pF
C4
150pF
C5
PGNDPGND
EXTPU
EXTPU
1.00Meg
R6
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3.3 Schematic
Figure 4. bq27411EVM Schematic
3.4 bq27411 Circuits Module Performance Specification Summary
Table 3 summarizes the performance specifications of the bq27411 circuit module.
Table 3. Performance Specification Summary
Specification Min Typ Max Unit
Input voltage Pack+ to Pack– 2.7 3.6 5 V
Charge and discharge current 0 1 6 A
4 EVM Hardware and Software Setup
This section describes how to install the bq27411EVM PC software and how to connect the different
components of the EVM.

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4.1 Software Installation
Find the latest software version at http://www.ti.com/tool/bqStudio. Use the following steps to install
Battery Management Studio:
1. Ensure that the EV2300 is not connected to the PC through a USB cable before starting this
procedure.
2. Select the Tool and Software tab in the product folder.
3. Under the Software section, click on Battery Management Studio (bqStudio) Software Suite.
4. Click the Download button to download the software.
5. Download software to hard drive.
6. 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. If using Windows 7,
install the software with administrator privileges.
6 Hardware Connection
The bq27411 evaluation system comprises three hardware components: the bq27411 circuit module, the
EV2300 or EV2400 PC interface board, and the PC.
6.1 Connecting the bq27411 Circuit Module to a Battery Pack
Figure 5 shows how to connect the bq27411 circuit module to the cells and system load/charger.
Figure 5. bq27411 Circuit Module Connection to Pack and System Load/Charger

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6.2 PC Interface Connection
The following steps configure the hardware for interface to the PC.
1. Connect the bq27411-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
bq27411EVM EV2300 or EV2400
SDA SDA
SCL SCL
VSS GND/VSS
The bq27411EVM is now set up for operation.
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 6) appears. If instead of Figure 6 appearing, Figure 7 appears, it may mean that the EVM
is not connected to the computer correctly. Make sure that the USB interface (EV2300 or EV2400 or GDK)
and the bq27411 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 <Refresh> (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.

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Figure 6. Registers Screen
This screen (Figure 6) shows the RAM data in the bq27411 device. Additional Flags and Status data can
be viewed at the bottom of the Registers screen.

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Figure 7. bqStudio Default Page
7.2 Setting Programmable bq27411 Options
The bq27411 data memory comes configured per the default settings detailed in the bq27411 technical
reference manual (SLUUAS7). Ensure that the settings are correctly changed to match the pack and
application for the bq27411 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 8).