Texas Instruments bq27546EVM User manual

User's Guide
SLUUB83–May 2015
bq27546EVM Single-Cell Impedance Track™ Technology
Evaluation Module
This evaluation module (EVM) is a complete evaluation system for the bq27546. The EVM includes one
bq27546 circuit module, with a current sense resistor, and thermistor. The circuit module includes one
bq27546 integrated circuit (IC), and all other onboard components necessary to monitor and predict
capacity. The circuit module connects directly across the cell in a battery. With the EV2300/EV2400
interface board and software, the user can read the bq27546 data registers, program the chipset for
different pack configurations, log cycling data for further evaluation, and evaluate the overall functionality
of the bq27546 solution under different charge and discharge conditions.
Contents
1 Features....................................................................................................................... 2
2 bq27546-Based Circuit Module ............................................................................................ 2
3 bq27546 Circuit Module Schematic ....................................................................................... 3
4 Circuit Module Physical Layouts and Bill of Materials .................................................................. 3
5 EVM Hardware and Software Setup ...................................................................................... 8
6 Troubleshooting Unexpected Dialog Boxes.............................................................................. 8
7 Hardware Connection ....................................................................................................... 8
8 Operation.................................................................................................................... 10
9 Calibrate Screen............................................................................................................ 11
10 Advanced Communication I2C ........................................................................................... 14
11 Related Documentation From Texas Instruments ..................................................................... 16
List of Figures
1 bq27546EVM Layout, Silkscreen.......................................................................................... 3
2 Top Assembly ................................................................................................................ 4
3 Top Layer..................................................................................................................... 4
4 Bottom Layer ................................................................................................................. 5
5 Schematic..................................................................................................................... 7
6 bq27546 Circuit Module Connection to Cell and System Load or Charger.......................................... 9
7 Registers Screen........................................................................................................... 10
8 Data Memory Screen ...................................................................................................... 11
9 Calibration Screen.......................................................................................................... 13
10 Advanced Comm I2C Screen ............................................................................................. 14
11 Parameter Q&A Screen ................................................................................................... 15
12 Golden Image Output Screen ............................................................................................ 15
13 Perform Programming Screen............................................................................................ 15
List of Tables
1 Ordering Information ........................................................................................................ 2
2 Bill of Materials............................................................................................................... 6
3 Performance Specification Summary ..................................................................................... 8
4 Circuit Module to EV2300/EV2400 Connections – I2C.................................................................. 9
Impedance Track is a trademark of Texas Instruments.
I2C is a trademark of NXP.
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Features www.ti.com
5 Circuit Module to EV2300/EV2400 Connections – HDQ ............................................................... 9
1 Features
• Complete evaluation system for the bq27546 gas gauge with Impedance Track™ Technology
• Populated circuit module for quick setup
• PC software (available at power.ti.com) and interface board for easy evaluation
• Software that allows data logging for system analysis
1.1 Kit Contents
• bq27546 circuit module
1.2 Ordering Information
Table 1. Ordering Information
EVM PART NUMBER CHEMISTRY CONFIGURATION CAPACITY
bq27546EVM-702 Li-ion 1 cell ≤14, 500 mAh
2 bq27546-Based Circuit Module
The bq27546-based circuit module is a complete and compact example solution of a bq27546 circuit for
battery management. The circuit module incorporates a bq27546 battery gas gauge IC, 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 cells: CELL+ and CELL-
• To the serial communications ports (SDA, SCL) or HDQ
• The system load and charger connect across PACK+ and PACK-
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2.2 Pin Descriptions
PIN NAME DESCRIPTION
PACK+ Pack positive terminal
PACK- Pack negative terminal
CELL+ Cell positive terminal
CELL- Cell negative terminal
SDA I2C™ communication data line
SCL I2C communication clock line
HDQ Single wire communication line
3 bq27546 Circuit Module Schematic
This section contains schematic information.
3.1 Schematic
The schematic follows the bill of materials in this user's guide.
4 Circuit Module Physical Layouts and Bill of Materials
This section contains the printed-circuit board (PCB) layout, bill of materials, and assembly drawings for
the bq27546 circuit module.
4.1 Board Layout
This section shows the PCB layers (Figure 1 through Figure 4), and assembly drawing for the bq27546
module.
Figure 1. bq27546EVM Layout, Silkscreen
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Figure 2. Top Assembly
Figure 3. Top Layer
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Layer 2
Layer 3
Figure 4. Bottom Layer
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4.2 Bill of Materials and Schematic
Table 2. Bill of Materials
Alternate Alternate
Designator Quantity Value Description PackageReference PartNumber Manufacturer PartNumber Manufacturer
C1 1 0.47uF CAP, CERM, 0.47 µF, 16 V, +/- 10%, 0402 GRM155R61C474KE01 MuRata
X5R, 0402
C2, C3, C4, 5 0.1uF CAP, CERM, 0.1 µF, 10 V, +/- 10%, X5R, 0402 GRM155R61A104KA01D MuRata
C6, C7 0402
C5 1 1uF CAP, CERM, 1 µF, 16 V, +/- 10%, X5R, 0402 C1005X5R1C105K050BC TDK
0402
D1, D2 2 5.1V Diode, Zener, 5.1 V, 300 mW, SOT-23 SOT-23 AZ23C5V1-7-F Diodes Inc.
J1, J3, J4 3 Header, 100mil, 2x1, Tin, TH Header, 2 PIN, 100mil, PEC02SAAN Sullins Connector
Tin Solutions
J2, J5 2 Header (friction lock), 100mil, 4x1, R/A, 4x1 R/A Header 22-05-3041 Molex
TH
J6 1 Header, 100mil, 3x1, Tin, TH Header, 3 PIN, 100mil, PEC03SAAN Sullins Connector
Tin Solutions
R1 1 4.7k RES, 4.7 k, 5%, 0.063 W, 0402 0402 CRCW04024K70JNED Vishay-Dale
R2, R3, R6, 8 100 RES, 100, 5%, 0.063 W, 0402 0402 CRCW0402100RJNED Vishay-Dale
R7, R8, R9,
R10, R11
R4, R5 2 10k RES, 10 k, 5%, 0.063 W, 0402 0402 CRCW040210K0JNED Vishay-Dale
R12 1 0.01 RES, 0.01, 1%, 0.25 W, 0805 0805 WSL0805R0100FEA18 Vishay-Dale
RT1 1 10.0k ohm Thermistor NTC, 10.0k ohm, 1%, Disc, Disc, 5x8.4 mm 103AT-2 SEMITEC Corporation
5x8.4 mm
SH-J1, SH-J3, 4 1x2 Shunt, 100mil, Flash Gold, Black Closed Top 100mil SPC02SYAN Sullins Connector
SH-J4, SH-J6 Shunt Solutions
TB1, TB2 2 Terminal Block, 6A, 3.5mm Pitch, 2-Pos, 7.0x8.2x6.5mm ED555/2DS On-Shore Technology
TH
TP1, TP2, TP3, 8 SMT Test Point, Miniature, SMT Testpoint_Keystone_Mi 5015 Keystone
TP4, TP5, TP6, niature
TP7, TP8
U1 1 Single Cell Li-Ion Battery Fuel Gauge for YZF0015BBBP BQ27546YZFR-G1 Texas Instruments BQ27546YZFT-G1 Texas Instruments
Battery Pack Integration, YZF0015BBBP
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0.1μF
C2
0.1μF
C3
0.1μF
C6
0.1μF
C7
3
1 2
5.1V
D1
AZ23C5V1-7-F
3
1 2
5.1V
D2
AZ23C5V1-7-F
1
2
J4
1
2
J3
1
2
J1
1
2
3
J6
4
1
2
3
J2
4
1
2
3
J5
100
R10
100
R3
100
R9
100
R7
100
R11
100
R2
100
R8
100
R6
4.7k
R1
10k
R4
0.01
R12
10.0k ohm
t°
RT1
1
2
TB2 1
2
TB1
TP8
TP5
TP7
TP1
TP3
TP4
TP2
TP6
NC E3
NC D3
SDA B3
SCL A3
BAT
E2
CE
D2 TS B2
HDQ A2 SRP
A1
SRN
B1
VSS
C1
VSS
C2
SE
C3
VCC D1
REGIN
E1
U1
BQ27546YZFR-G1
GND
GND
GND
10k
R5
GND
GND
VCC
VCC
VCC
VCC
0.47μF
C1
1 Fμ
C5
GND
GND
NT1
Net-Tie
Vin Max: 5V
Current Max: 3A
CELL+
CELL-
CELL+
CELL-
Place C2 close to REGIN pin
Place C3 close to BAT pin
ON
OFF
CE
Ext Thermistor
TS VCC
Place R10, R11, C4, C6, C7
Close to GG
HDQ
VSS
SDA
SCL
VSS
PACK+/Load+
PACK-/Load-
PACK-
PACK+
0.1μF
C4
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Figure 5. Schematic
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4.3 bq27546 Circuit Module Performance Specification Summary
This section summarizes the performance specifications of the bq27546 circuit module.
Table 3. Performance Specification Summary
Specification Min Typ Max Units
Input voltage Pack+ to Pack– 2.7 3.6 5 V
Input voltage CELL+ to CELL- 2.7 3.6 5 V
Charge and discharge current 0 1 2 A
5 EVM Hardware and Software Setup
This section describes how to install the bq27546 PC software, and how to connect the different
components of the EVM.
5.1 Software Installation
Find the latest software version in the bq27546 tool folder on www.ti.com. Make a search by Products for
bq27546 to access the product folder. Use the following steps to install Battery Management Studio.
5.1.1 Using EV2300
Use the following steps to install the bq27546EVSW software when using EV2300:
1. Ensure that the EV2300/EV2400 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, or click the
link.
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.
5.1.2 Using EV2400
Use the following steps to install the bq27546EVSW software when 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 bq27546 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. Before starting the EVSW, connect the EV2400 to the computer using the USB cable.
6. Wait for 20 seconds or until windows installs the driver.
6 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.
7 Hardware Connection
The bq27546EVM comprises three hardware components: the bq27546 circuit module, the
EV2300/EV2400 PC interface board, and the PC.
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7.1 Connecting the bq27546 Circuit Module to a Battery Cell
Figure 6 shows how to connect the bq27546 circuit module to the cell and system load or charger.
Figure 6. bq27546 Circuit Module Connection to Cell and System Load or Charger
7.2 PC Interface Connection
The bq27546 can be configured as an HDQ communication device or left in default as an I2C device.
Once the bq27546 is configured for HDQ communication, it cannot be reverted to I2C mode. Refer to
chapter 12 of this document for information on configuring the bq27546 to HDQ mode.
The following steps configure the hardware for interfacing to the PC:
1. Connect the bq27546-based pack to the EV2300/EV2400 using wire leads as shown in Table 4.
Table 4. Circuit Module to EV2300/EV2400 Connections – I2C
bq27546-Based Battery EV2300 (I2C port) EV2400 (Port 2, I2C)
(I2C mode)
SDA SDA 3 SDA 2.3
SCL SCL 2 SCL 2.2
VSS GND 1 VSS 2.1
Table 5. Circuit Module to EV2300/EV2400 Connections – HDQ
bq27546-Based Battery EV2300 (HDQ port) EV2400 (Port 3, HDQ)
(HDQ mode)
HDQ HDQ 3 SDA 3.3
VSS GND 1 VSS 3.1
2. Connect the PC USB cable to the EV2300/EV2400 and the PC USB port.
The bq27546EVM is now set up for operation.
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8 Operation
This section details the operation of the bq27546 evaluation software.
8.1 Starting the Program
Run bqStudio from the Start | All Programs | Texas Instruments | Battery Management Studio. The main
screen (Figure 7) appears. 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 7. Registers Screen
This screen (Figure 7) shows the RAM data in the bq27546 device. Additional Flag and Status data can
be viewed at the bottom of the Registers screen.
8.2 Setting Programmable bq27546 Options
The bq27546 data memory comes configured per the default settings detailed in the bq27546 technical
reference manual (SLUUB74). Ensure that the settings are correctly changed to match the pack and
application for the bq27546 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).
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