Texas Instruments bq27531EVM User manual

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bq27531EVM With bq27531 Battery Management Unit Impedance Track™
Fuel Gauge and bq24192 4.5-A, Switch-Mode Battery Charger for Single-Cell
Applications
Impedance Track is a trademark of Texas Instruments.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
All other trademarks are the property of their respective owners.
User's Guide
SLUUA90A–April 2013–Revised July 2016
bq27531EVM With bq27531 Battery Management Unit
Impedance Track™ Fuel Gauge and bq24192 4.5-A,
Switch-Mode Battery Charger for Single-Cell Applications
This evaluation module (EVM) is a complete evaluation system for the Battery Management Unit (BMU)
chipset consisting of the bq27531-G1 fuel gauge and bq24192 battery charger. The EVM includes one
bq27531 circuit, including a current sense resistor and one thermistor. In addition, the fuel gauge controls
the bq24192 battery charger's settings and monitors its status via I2C communication lines. Together, the
chipset provides all necessary components to monitor and predict capacity for a system-side fuel gauge
solution as well as to charge the battery from either an adapter or USB input with up to 4.5-A of charge
current. The circuit module connects directly across the battery pack. With the EV2300 interface board
and software, the user can read the bq27531-G1 data registers, program the chipset for different pack
configurations, log cycling data for further evaluation, and evaluate the overall functionality of the battery
management unit solution under different charge and discharge conditions. The latest Microsoft®
Windows®based PC software can be downloaded from the product folder on the Texas Instruments Web
site.
Contents
1 Features....................................................................................................................... 2
2 bq27531-Based Circuit Module ............................................................................................ 2
3 Circuit Module Physical Layouts, Bill of Materials, and Schematic ................................................... 6
4 EVM Hardware and Software Setup..................................................................................... 13
5 Troubleshooting Unexpected Dialog Boxes ............................................................................ 16
6 Operation.................................................................................................................... 17
7 Calibration................................................................................................................... 19
8 Advanced Communication I2C............................................................................................ 21
9 Related Documentation From Texas Instruments ..................................................................... 22
List of Figures
1 Schematic..................................................................................................................... 3
2 bq27531EVM-001 Layout – Silk Screen.................................................................................. 6
3 Layer 1 ........................................................................................................................ 7
4 Layer 2 ........................................................................................................................ 8
5 Layer 3 ........................................................................................................................ 9
6 Layer 4....................................................................................................................... 10
7 BAT_Load (PR1010) Schematic ......................................................................................... 13
8 Test Setup for bq27531EVM (PWR216)................................................................................ 15
9 Registers Screen........................................................................................................... 17
10 bqStudio Default Page..................................................................................................... 18
11 Data Memory Screen...................................................................................................... 19
12 Calibration Screen ......................................................................................................... 20
13 Advanced Communication I2C............................................................................................ 21
14 Golden Image Output Screen ............................................................................................ 21
15 Perform Programming Screen............................................................................................ 21

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Applications
List of Tables
1 Ordering Information ........................................................................................................ 2
2 Bill of Materials ............................................................................................................. 11
1 Features
• Complete evaluation system for the Battery Management Unit chipset consisting of the bq27531-G1
Impedance Track fuel gauge and bq24192 4.5-A Battery Charger.
• Populated circuit module for quick setup
• Personal computer (PC) software and interface board (orderable on TI website) for easy evaluation
• Software that allows data logging for system analysis (available in product folder on TI website)
• Ability to upgrade to the latest firmware version by flash reprogramming
1.1 Kit Contents
• bq27531-G1 and bq24192 chipset circuit module (PWR216)
• NTC103AT thermistor
This EVM is used for the evaluation of the bq27531-G1 and bq24192 BMU chipset. Ensure that you visit
the product Web folder at www.ti.com to download the latest firmware version, evaluation software, and
documentation for the associated product to be evaluated.
1.2 Ordering Information
Table 1. Ordering Information
EVM PART NUMBER CHEMISTRY CONFIGURATION CAPACITY
bq27531EVM Li-ion 1 cell Any
2 bq27531-Based Circuit Module
The bq27531-based circuit module is a complete and compact example solution of a bq27531 circuit for
battery management. The circuit module incorporates a bq27531 battery gas gauge integrated circuit (IC)
and all other components necessary to accurately predict the capacity of 1-series Li-ion cell.

www.ti.com bq27531-Based Circuit Module
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Figure 1. Schematic

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2.1 Circuit Module Connections
Contacts on the circuit module provide the following connections:
• Direct connection to the battery pack (J12): PACK+, PACK–, and TS
• To the serial communications port (J10): SDA, SCL, and VSS
• Connection to system load (J5)
• Connection to charger (J2)
• Access to signal output (J13): SOC_INT
2.2 I/O Description
Header/Terminal Block Description
J1–VIN Adapter positive terminal
J2–VIN Adapter positive terminal
J2–GND Adapter negative terminal
J3-GND Adapter negative terminal
J4-SYS System positive terminal
J5-SYS System positive terminal
J5-GND System negative terminal
J6-GND System negative terminal
J7-TEST Test terminal
J8 USB Miniconnector
J9 USBTOGPIO 10-pin connector (not installed)
J10 EV2300 connector for using bq27531 software to communicate with bq27531 IC
J11 Allows SOC_INT to be tied to external pullup rather than VCC
J12-PACK+ Battery positive terminal
J12-T Pack thermistor input that leads to IC TS pin
J12-PACK- Battery negative terminal
J12-SOC_INT SOC_INT output from gauge
2.3 Test Points
Test Point Description
TP1 bq24192 IN voltage
TP2 bq24192 PSEL pin
TP3 bq24192 PG/D- pin
TP4 bq24192 STAT pin
TP5 bq24192 SCL = bq27531 BSCL - I2C communication clock line
TP6 bq24192 SDA = bq27531 BSDA - I2C communication data line
TP7 bq24192 INT pin
TP8 bq24192 OTG pin
TP9 bq24192 CE pin
TP10 PGND
TP11 bq24192 TS1 pin
TP12 bq24192 TS2 pin
TP13 bq24192 BAT pin
TP14 PGND
TP15 bq24192 SYS pin
TP16 PGND
TP17 PGND

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Applications
Test Point Description
TP18 PGND
TP19 bq24192 SW pin
TP20 bq24192 SW signal
TP21 bq24192 PMID pin
TP22 PGND
TPA1 PACK-
TPA2 bq27531 SOC_INT pin
TPD1 bq27531 VCC pin
TPD3 bq27531 TS pin
TDPE3 External thermistor output
TPE3 bq27531 BI/TOUT pin
2.4 Control and Key Parameters Setting
Jumper Description Default Factory Setting
JP1
USB D+/D- Shorting jumper for USB data lines DM (D-) and DP (D+). When shorted,
USB input current limit defaults to 1.5 A. Otherwise, USB100 mode is
selected. INSTALLED
JP2
PSEL
2-3 (PSEL = LO): Indicates that an ac adapter is connected to the USB input
and sets the USB input current limit to 1.5 A.
1-2 (PSEL = HI): Indicates that a USB source is connected to the USB input
and sets the input current limit to 500 mA. (DEFAULT) 1-2 (PSEL = HI)
JP3
OTG When installed, OTG feature will be disabled. NOT INSTALLED
JP4
CHARGE ENABLE When installed, charging is enabled. INSTALLED
JP5
SOC_INT 2-3: SOC_INT is tied to external pull-up 1-2: SOC_INT is tied to onboard VCC through pull-up (DEFAULT) 1-2 VCC
JP6
D-/PG 2-3: Connect D-/PG to D- 1-2: Connect D-/PG to PG (DEFAULT) 1-2 PG
JP7
FUEL GAUGE
ENABLE 1-2 ON: Fuel gauge enable (CE) pin high for normal operation (DEFAULT)
2-3 OFF: Fuel gauge enable (CE) pin low to disable gauging 1-2 ON

T
I
EXAS
NSTRUMENTS
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3 Circuit Module Physical Layouts, Bill of Materials, and Schematic
This section contains the board layout, bill of materials, assembly drawings, and schematic for the
bq27531 circuit module.
3.1 Board Layout
This section shows the printed-circuit board (PCB) layers (Figure 2 through Figure 5), assembly drawing,
and schematic for the bq27531 module.
Figure 2. bq27531EVM-001 Layout – Silk Screen

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Figure 3. Layer 1

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Figure 4. Layer 2

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Figure 5. Layer 3

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Figure 6. Layer 4

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3.2 Bill of Materials and Schematic
Table 2. Bill of Materials
COUNT RefDes Value Description Size Part Number MFR
1 C18 0.033uF Capacitor, Ceramic, 16V, X7R, 10% 402 C1005X7R1C333K TDK
4 C15, C16, C19, C20 0.1uF Capacitor, Ceramic, 6.3V, X5R, 10% 402 C1005X5R0J104K050BA TDK
1 C17 1.0uF Capacitor, Ceramic, 6.3V, X5R, 10% 402 C1005X5R0J105K050BB TDK
2 C11, C12 0.1uF Capacitor, Ceramic, 25V, X5R, 10% 603 C1608X5R1E104K TDK
2 C10, C14 1.0uF Capacitor, Ceramic, 10V, X5R, 10% 603 C1608X5R1A105K080AC TDK
1 C5 1.0uF Capacitor, Ceramic, 25V, X5R, 10% 603 C1608X5R1E105K080AC TDK
1 C6 4.7uF Capacitor, Ceramic, 10V, X5R, 10% 603 CGB3B1X5R1A475K055AC TDK
1 C13 10uF Capacitor, Ceramic, 10V, X5R, 10% 603 C1608X5R1A106K080AC TDK
1 C7 47nF Capacitor, Ceramic, 10V, X5R, 10% 603 06033D473KAT2A AVX
0 C3, C4 DNP Capacitor, Ceramic, 10V, X5R, 10% 603
4 C1, C2, C8, C9 10uF Capacitor, Ceramic, 25V, X5R, 10% 805 C2012X5R1E106K125AB TDK
0 J9 DNP Connector, Male Straight 2x5 pin, 100mil
spacing, 4 Wall 0.338 x 0.788 inch N2510-6002-RB 3M
1 J8 UX60-MB-5ST Connector, Recpt, USB-B, Mini, 5-pins,
SMT 0.354 X 0.303 Inches UX60-MB-5ST Hirose Electric Co
2 D1, D2 Green Diode, LED, Green, 2.1-V, 10-mA, 6-mcd 603 LTST-C190GKT Liteon
5 J1, J3, J4, J6, J11 PEC02SAAN Header, Male 2-pin, 100mil spacing 0.100 inch x 2 PEC02SAAN Sullins
1 J10 22-05-3041 Header, Friction Lock Ass'y, 4-pin Right
Angle 0.400 x 0.500 22-05-3041 Molex
1 L1 2.2uH Inductor, SMT, 4.2A, 50.1milliohm 0.204 x 0.216 inch IHLP2020BZER2R2M01 Vishay
3 JP1, JP3, JP4 PEC02SAAN Header, Male 2-pin, 100mil spacing 0.100 inch x 2 PEC02SAAN Sullins
4 JP2, JP5, JP6, JP7 PEC03SAAN Header, Male 3-pin, 100mil spacing 0.100 inch x 3 PEC03SAAN Sullins
1 R4 10.0k Potentiometer, 3/8 Cermet, Single-Turn 0.25x0.17 inch 3266W-1-103LF Bourns
1 R25 1.00k Resistor, Chip, 1/16W, 1% 402 CRCW04021K00FKED Vishay
3 R17, R18, R23 10.0k Resistor, Chip, 1/16W, 1% 402 CRCW040210K0FKED Vishay
1 R22 18.2k Resistor, Chip, 1/16W, 1% 402 CRCW040218K2FKED Vishay
2 R1, R5 0 Resistor, Chip, 1/10W 603 CRCW06030000Z0EA Vishay
2 R6, R7 5.23k Resistor, Chip, 1/10W, 1% 603 CRCW06035K23FKEA Vishay
2 R19, R20 1.00M Resistor, Chip, 1/10W, 1% 603 ERJ-3EKF1004V Panasonic
2 R11, R12 7.5k Resistor, Chip, 1/10W, 1% 603 CRCW06037K50FKEA Vishay
1 R2 169 Resistor, Chip, 1/10W, 1% 603 ERJ-3EKF1690V Panasonic
0 R10, R13, R14, R15, R16 DNP Resistor, Chip, 1/10W, 1% 603
1 R3 768 Resistor, Chip, 1/10W, 1% 603 ERJ-3EKF7680V Panasonic

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Table 2. Bill of Materials (continued)
1 R21 1.8M Resistor, Chip, 1/10W, 1% 603 ERJ-3EKF1804V Panasonic
2 R8, R9 2.21k Resistor, Chip, 1/10W, 1% 603 ERJ-3EKF2211V Panasonic
1 R24 0.01 Resistor, Chip, 1/4W, 1% 805 WSL0805R0100FEA18 Vishay
4 J2, J5, J7, J13 ED555/2DS Terminal Block, 2-pin, 6-A, 3.5mm 0.27 x 0.25 ED555/2DS OST
1 J12 ED555/3DS Terminal Block, 3-pin, 6-A, 3.5mm 0.41 x 0.25 inch ED555/3DS OST
0 TP1, TP2, TP3, TP4, TP5,
TP6, TP7, TP8, TP9,
TP10, TP11, TP12, TP13,
TP14, TP15, TP16, TP17,
TP18, TP19, TP20, TP21,
TP22, TPA1, TPA2,
TPD1, TPD3, TPDE3,
TPE3
DNP Test Point, 0.020 Hole 0.100 x 0.100 inch
1 TP20 131-4244-00 Adaptor, 3.5-mm probe clip ( or 131-5031-
00) 0.200 inch 131-4244-00 Tektronix
1 U1 bq24192RGET IC, I2C Controlled 4.5A Single Cell
USB/Adapter Charger QFN-24 bq24192RGET TI
1 U2 bq27531-
G1YZFT IC, Battery Management Unit Impedance Track Fuel Gauge With bq24192 Charger
Controller
BGA bq27531-G1YZFT TI
1 RT1 10K Thermistor, NTC, 3-A 0.095 X 0.150 inch 103AT-2 Semitec
5 Shunt, 100-mil, Black 0.100 929950-00 3M
1 PCB PWR216 Any

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3.3 bq27531 Circuit Module Performance Specification Summary
This section summarizes the performance specifications of the bq27531 circuit module.
3.4 Recommended Operating Conditions
Min Typ Max Unit
Supply voltage, VIN Input voltage from ac adapter 4.2 6 V
System voltage, VSYS Voltage output at SYS terminal (depends on VBAT voltage
and status of VINDPM and input current limit circuits) 3.3 VBATR EG+4.17
%
V
Battery voltage, VBAT Voltage output at VBAT terminal (registers set via bq27531
software) 3 4.2 4.44 V
Supply current, IIN(MAX) Maximum input current from ac adapter input (registers set
via bq27531 software) 1.5 3 A
Fast charge current,
ICHRG(MAX)
Battery charge current (registers set via bq27531 software) 0.550 3 A
Operating junction temperature range, TJ-40 125 °C
4 EVM Hardware and Software Setup
This section describes how to connect the different components of the EVM how to install the
bq27531EVM PC software and.
4.1 Recommended Test Equipment
4.1.1 Power Supplies
1. Power Supply #1 (PS #1) capable of supplying 6 V at 3 A is required.
2. If not using a battery as the load, then power supply #2 (PS #2) capable of supplying up to 5 V at 5 A
is required to power the circuit shown in Figure 7.
4.1.2 Load #1 Between BAT and GND
Testing with an actual battery is the best way to verify operation in the system. If a battery is not available,
then a circuit similar to the one shown in Figure 7 can simulate a battery when connected to a power
supply.
Figure 7. BAT_Load (PR1010) Schematic

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4.1.3 Load #2 Between SYS and GND
Although not required, a resistive load capable of sinking up to 3 A can be used.
4.1.4 Meters
Three equivalent voltage meters (VM #) and two equivalent current meters (CM #) are required. The
current meters must be able to measure 3-A current.
4.1.5 Test Equipment Setup
1. For all power connections, use short, twisted-pair wires of appropriate gauge wire for the amount of the
current.
2. Set Power Supply #1 (PS #1) for 6-V, 3-A current limit and then turn off supply.
3. If BAT_Load as shown in Figure 8 is used, connect Power Supply #2 (PS #2) set to approximately 3.6
V to the input side (PS #2+/-) of BAT_Load, then turn off PS #2.
4. Connect the output side of the battery or BAT_Load in series with current meter to J12 (PACK+,
PACK-). Ensure that a voltage meter is connected across J12 (PACK+,PACK-).
5. Connect VM #3 across J5 (SYS, GND).
6. Ensure jumpers are at the default factory settings per Section 2.4
7. Connect I2C port of EV2300 with J10 board using the assembled 4 colored-wire connector included
with EV2300 kit (GND / BLACK at the bottom).
8. After the preceding steps have been performed, the test setup for PWR216 is configured as is shown
in Figure 8

PS#1
Elec Load/
Resistor Box
PR1010
PS#2
EV2300
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Figure 8. Test Setup for bq27531EVM (PWR216)
9. Turn on the computer. Open the bq27531 evaluation software. The main window of the software is
shown in Figure 9 (DataRAM Screen).
4.2 Software Installation
Find the latest software version at http://www.ti.com/tool/bqStudio. Use the following steps to install
Battery Management Studio:
4.2.1 Using EV2300
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.

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4.2.2 Using EV2400:
1. Ensure that the EV2400 is not connected to the PC through a USB cable before starting this
procedure.
2. Browse for the supported software link within the bq27531 TI web site product folder to find the
downloadable EVSW installation files.
3. Open the software file that was downloaded from the TI web site.
4. Follow the instructions on screen until the software installation is completed.
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 policy.

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6 Operation
This section details the operation of the bqStudio software.
6.1 Starting the Program
Run bqStudio from the Start | All Programs | Texas Instruments | Battery Management Studio. The main
screen (Figure 9) appears. If instead of Figure 9 appearing, Figure 10 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 bq27531 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.
Figure 9. Registers Screen
This screen (Figure 9) shows the RAM data in the bq27531 device. Additional Flags and Status data can
be viewed at the bottom of the Registers screen.

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Figure 10. bqStudio Default Page
6.2 Setting Programmable bq27531 Options
The bq27531 data memory comes configured per the default settings detailed in the bq27531 technical
reference manual (SLUUA96). Ensure that the settings are correctly changed to match the pack and
application for the bq27531 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 11).

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Figure 11. Data Memory Screen
To read all the data from the bq27531 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
bq27531 data memory. If the Gauge Dashboard is not displaying any information, then the bq27531 may
not be supported by the bqStudio version being used, a bqStudio upgrade may be required.
7 Calibration
The bq27530EVM must be calibrated to ensure accurate value reporting. This can be done by going to the
Calibration window in bqStudio (Figure 12).
7.1 Calibrating the bq27531
Calibrate each item one at a time in the order presented in this document. Select the types of calibration
to be performed by selecting the corresponding checkbox (see Figure 12).
Enter the measured values for the types selected, if necessary.
Then press the Calibrate Part as indicated below button. After all calibration is complete, close the
Calibrate subwindow. While the Calibrate subwindow is open, even in the background, the calibration
routines are running in firmware. Close the subwindow to ensure that they are stopped before proceeding
with configuration or testing.
7.2 CC Offset Calibration
This performs the internal calibration of the coulomb counter input offset. Press the Calibrate Coulomb
Counter button.

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bq27531EVM With bq27531 Battery Management Unit Impedance Track™
Fuel Gauge and bq24192 4.5-A, Switch-Mode Battery Charger for Single-Cell
Applications
7.3 Voltage Calibration
• Measure the voltage across Pack+ and Pack- with a calibrated meter.
• Type the voltage value in mV into Enter Actual Voltage .
• Measure the temperature for PACK.
• Type the temperature value into Enter Actual Temperature.
• Press the Calibrate Voltage and Temperature as indicated below button.
7.4 Board Offset Calibration
This performs the offset calibration for the current offset of the board. It takes approximately 35 seconds to
complete.
It is expected that no current is flowing through the sense resistor while performing this calibration step.
Remove load and short PACK– to GND.
Press the Calibration Board Offset button.
7.5 Pack Current Calibration
• Connect a load to GND and SYS that draws approximately 1 A, or connect a current source to GND
and Pack–. Ensure that the Measured Current reported is negative, or else reverse the connections.
• Measure the current with a calibrated meter, and type the value into Enter Actual Current using (-) for
current in discharge direction.
• Press the Calibrate Gas Gauge button.
Figure 12. Calibration Screen