Texas Instruments BQ20Z40EVM-001 User manual

User's GuideSLUU320C – January 2009 – Revised June 2009
bq20z40EVM-001 SBS 1.1 Impedance Track™TechnologyEnabled Battery Management Solution EVM
This EVM is a complete evaluation system for the bq20z40/bq29330/bq29412 battery managementsystem. The EVM includes one bq20z40/bq29330/bq29412 circuit module, a current sense resistor, twothermistors, and a link to Windows™-based PC software. The circuit module includes one bq20z40 IC,one bq29330 IC, one bq29412 IC, and all other onboard components necessary to monitor and predictcapacity, perform cell balancing, monitor critical parameters, protect the cells from overcharge,overdischarge, short circuit, and overcurrent in 2-, 3- or 4-series cell Li-ion or Li-polymer battery packs.The circuit module connects directly across the cells in a battery. With the EV2300 interface board andsoftware, the user can read the bq20z40 data registers, program the chipset for different packconfigurations, log cycling data for further evaluation, and evaluate the overall functionality of thebq20z40/bq29330/bq29412 solution under different charge and discharge conditions.
Contents1 Features ....................................................................................................................... 22 bq20z40/bq29330-Based Circuit Module ................................................................................. 23 bq20z40/bq29330 Circuit Module Schematic ............................................................................ 34 Circuit Module Physical Layouts and Bill of Materials .................................................................. 35 EVM Hardware and Software Setup ...................................................................................... 86 Troubleshooting Unexpected Dialog Boxes .............................................................................. 87 Hardware Connection ....................................................................................................... 88 Operation .................................................................................................................... 109 Calibration Screen.......................................................................................................... 1310 Pro (Advanced) Screen .................................................................................................... 1511 Related Documentation from Texas Instruments ...................................................................... 16
List of Figures
1 bq20z40EVM-001 Layout (Silk Screen) .................................................................................. 42 Top Assembly ................................................................................................................ 43 Top Layer ..................................................................................................................... 44 Bottom Layer ................................................................................................................. 55 Bottom Assembly ............................................................................................................ 56 Schematic ..................................................................................................................... 77 bq20z40/bq29330 Circuit Module Connection to Cells and System Load/Charger ................................. 98 SBS Data Screen........................................................................................................... 119 Data Flash Screen, 1st Level Safety Class ............................................................................. 1210 Calibration Screen.......................................................................................................... 1411 Pro (Advanced) Screen .................................................................................................... 15
List of Tables
1 Ordering Information ........................................................................................................ 22 Bill of Materials ............................................................................................................... 63 Performance Specification Summary ..................................................................................... 84 Circuit Module to EV2300 Connections ................................................................................... 9
Impedance Track is a trademark of Texas Instruments.Windows is a trademark of Microsoft Corporation.
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1 Features
1.1 Kit Contents
1.2 Ordering Information
2 bq20z40/bq29330-Based Circuit Module
2.1 Circuit Module Connections
Features www.ti.com
•Complete evaluation system for the bq20z40 SBS 1.1-compliant advanced gas gauge with ImpedanceTrack™ technology, bq29330 analog front end (AFE) and protection IC, and bq29412 independentovervoltage protection integrated circuit (IC)•Populated circuit module for quick setup•Link to software that allows data logging for system analysis
•bq20z40/bq29330/bq29412 circuit module•Set of support documentation
Table 1. Ordering Information
EVM PART NUMBER CHEMISTRY CONFIGURATION CAPACITY
bq20z40EVM-001 Li-ion 2, 3, or 4 cell Any
The bq20z40/bq29330/bq29412-based circuit module is a complete and compact example solution of abq20z40 and bq29330 circuit for battery management and protection of Li-ion or Li-polymer packs. Thecircuit module incorporates a bq20z40 battery monitor IC, bq29330 AFE and protection IC, bq29412independent overvoltage protection IC, and all other components necessary to accurately predict thecapacity of 2-, 3-, or 4-series cells.
Contacts on the circuit module provide the following connections:•Direct connection to the cells: 1N (BAT–), 1P, 2P, 3P, 4P (BAT+)•To the serial communications port (SMBC, SMBD, VSS)•The system load and charger connect across PACK+ and PACK–•To the system present pin (SYS PRES)
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2.2 Pin Descriptions
3 bq20z40/bq29330 Circuit Module Schematic
3.1 Schematic
3.2 Choosing Particular Precharge Mode
3.3 Testing Fuse-Blowing Circuit
4 Circuit Module Physical Layouts and Bill of Materials
www.ti.com bq20z40/bq29330 Circuit Module Schematic
PIN NAME DESCRIPTION1N –ve connection of first (bottom) cell1P +ve connection of first (bottom) cell2P +ve connection of second cell3P +ve connection of third cell4P +ve connection of fourth (top) cellSMBC Serial communication port clockSMBD Serial communication data portVSS Pack negative terminalPACK– Pack negative terminalSYS PRES System present pin (if low, system is present)PACK+ Pack positive terminal
This section contains information on the schematic for the bq20z40/bq29330/bq29412 implementation.
The schematic follows the bill of materials in this user's guide.
The chipset supports both a charger that has a precharge mode and one that does not. The EVMsupports a charger that does not have a precharge mode by grounding the PMS pin with resistor R16.R12 and Q2 are used as the precharge current path in order to sustain sufficient Pack+ voltage when thebattery voltage is too low to power up the bq29330 IC.
If the charger has a precharge function, R12 and FET Q2 are not used. The EVM does not have aprovision to pull high the PMS pin to disable ZVCHG output. The charge FET Q1 is used as the prechargeFET, and the charger must control the precharge current and voltage.
Note: The configuration at PMS pin is a hardware level control. Once the bq20z40 is up and running, thefirmware may change the precharge settings. See the bq20z40 data sheet (SLUS801 ). for furtherinformation.
To prevent the loss of board functionality during the fuse-blowing test, the actual chemical fuse is notprovided in the circuit. FET Q4 drives TP3 low if a fuse-blow condition occurs; so, monitoring TP3 can beused to test this condition.
This section contains the board layout, bill of materials, and assembly drawings for the bq20z40/ bq29330/bq29412 circuit module.
Note: For the battery pack designer: D3 may have side effects. See the application report bq29330External Short-Circuit Protection (SLUA436 )
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4.1 Board Layout
Circuit Module Physical Layouts and Bill of Materials www.ti.com
This section shows the dimensions, PCB layers, and assembly drawing for the bq20z40/bq29330 module.
Figure 1. bq20z40EVM-001 Layout (Silk Screen)
Figure 2. Top Assembly
Figure 3. Top Layer
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www.ti.com Circuit Module Physical Layouts and Bill of Materials
Figure 4. Bottom Layer
Figure 5. Bottom Assembly
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4.2 Bill of Materials
Circuit Module Physical Layouts and Bill of Materials www.ti.com
Table 2. Bill of MaterialsCount Ref Des Value Description Size Part No. MFR
20 C1–C11,
C14,
0.1 µF Capacitor, ceramic, 0.1 µF, 50 V, X7R, 20% 0603 STD AnyC16–C20,
C22–C24
1 C12 0.22 µF Capacitor, ceramic, 0.22 µF, 25 V, X7R, 20% 0603 STD Any
3 C13, C15, 1.0 µF Capacitor, ceramic, 1.0 µF, 25 V, X7R, 20% 0805 STD AnyC27
2 C21, C26 0.47 µF Capacitor, ceramic, 0.47 µF, 16 V, X7R, 20% 0603 STD Any
1 C25 2.2 µF Capacitor, ceramic, 2.2 µF, 10 V, X7R, 20% 0805 STD Any
4 D1, D3, D4, BAS16 Diode, Switching, 150-mA, 75-V, 350 mW SOT23 BAS16 Vishay-LiteonD6
2 D2, D5 AZ23C5V6 Diode, dual, Zener, 5.6V, 300mW SOT23 AZ23C5V6 Vishay-Telefunken
1 J1 22-05-3041 Header, friction lock assembly, 4-pin right angle 0.400 x 0.500 22-05-3041 Molex
2 Q1, Q3 FDS8817NZ MOSFET, N-ch, 30 V, 15 A, 7 m ΩSO8 FDS8817NZ Fairchild
1 Q2 FDS4435BZ MOSFET, P-ch, –30 V, –8.8 A, 20 m ΩSO8 FDS4435BZ Fairchild
1 Q4 NDS331N MOSFET, N-ch, 20 V, 1.3 A, 0.16 ΩSOT23 NDS331N Fairchild
1 Q5 BSS138 MOSFET, N-ch, 50 V, 0.22 A, 6 ΩSOT23 BSS138 Fairchild
12 R1–R5, 100 Resistor, chip, 100 Ω, 1/16 W, 5% 0603 STD STDR21–R24,
R31, R32,R36
2 R11, R19 3M Resistor, chip, 3 M Ω, 1/16 W, 5% 0603 STD STD
1 R12 301 Resistor, chip, 301 Ω, 1 W, 1% 2512 WSL-2512-301 Vishay1% R86
3 R13, R15, 5.1K Resistor, chip, 5.1 k Ω, 1/16 W, 5% 0603 STD STDR18
3 R14, R25, 1M Resistor, chip, 1 M Ω, 1/16 W, 5% 0603 STD STDR30
1 R16 100K Resistor, chip, 100 k Ω, 1/16 W, 5% 0603 STD STD
1 R17 0.010 75ppm Resistor, chip, 0.010 Ω, 1 W, 1% 2512 WSL-2512-010 Vishay1% R86
1 R20 10K Resistor, chip, 10 k Ω, 1/16 W, 5% 0603 STD STD
2 R26, R34 8.45K Resistor, chip, 8.45 k Ω, 1/16 W, 1% 0603 STD STD
2 R27, R33 61.9K Resistor, chip, 61.9 k Ω, 1/16 W, 1% 0603 STD STD
3 R28, R29, 220K Resistor, chip, 220 k Ω, 1/16 W, 5% 0603 STD STDR35
6 R6–R10, R37 1K Resistor, Chip 1 k Ω, 1/16W, 5% 0603 STD STD
2 RT1, RT2*** 10K Thermistor, 10 k Ω0.095 x 0.150 103AT-2 Sematec
2 TB1, TB3 ED1515 Terminal block, 3 pin, 6 A, 3,5 mm 0.41 x 0.25 ED555/3DS OST
1 TB2 ED1514 Terminal block, 2 pin, 6 A, 3,5 mm 0.27 x 0.25 ED555/2DS OST
1 TP1 GND Test point, Black, Thru Hole Color Keyed 0.100 ×0.100 in 5000 Keystone
1 TP2 VCC Test point, Red, Thru Hole Color Keyed 0.100 ×0.100 in 5001 Keystone
1 TP3 ~FUSE Test point, White, Thru Hole Color Keyed 0.100 ×0.100 in 5002 Keystone
1 U1 bq29412DCT3R IC, voltage protection for 2, 3, or 4 cell Li-Ion, MSOP-08 (DCT3) bq29412DCT3R TI2nd protection, 4.45 OVP ±25 mV
1 U2 bq29330DBT IC, 2, 3, or 4 cell series protection control AFE TSSOP-30 bq29330DBT TI
1 U3 bq20z40PW IC, Impedance Track Gas Gauge TSSOP-20 bq20z40PW TI
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www.ti.com Circuit Module Physical Layouts and Bill of Materials
Figure 6. Schematic
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4.3 bq20z40/bq29330/bq29412 Circuit Module Performance Specification Summary
5 EVM Hardware and Software Setup
5.1 System Requirements
5.2 Software Installation
6 Troubleshooting Unexpected Dialog Boxes
7 Hardware Connection
EVM Hardware and Software Setup www.ti.com
This section summarizes the performance specifications of the bq20z40/ bq29330/bq29412 circuit module.
Table 3. Performance Specification Summary
Specification Min Typ Max Units
Input voltage Pack+ to Pack– 6 15 25 VCharge and discharge current 0 2 7 A
This section describes how to install the bq20z40EVM-001 PC software, and how to connect the differentcomponents of the EVM.
The bq20z40EVSW requires Windows 2000 or Windows XP.
Obtain the latest software archive from the Support software section of the EVM product folder at xxx, orsearch for the latest software version from power.ti.com . Use the following steps to install thebq20z40EVSW software:1. Save the archive to a temporary directory. Open the archive containing the installation package, andcopy its contents in a temporary directory. The executable filename can consist of several componentnames and versions. Double-click on the executable filename, and follow the installer instructions tocomplete the bq20z40 EVSW installation.2. If the EV2300 was not previously installed, after bq20z40 EVSW installation, a TI USB DRIVERINSTALLER pops up. Click "Yes" for the agreement message and follow its instructions.3. Plug the EV2300 into a USB port.
Ensure that the files were extracted from the zip file using the Preserve Folder names option.
Ensure that all the files were extracted from the zip file.
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 operatingsystem policy.
The bq20z40EVM-001 comprises two hardware components: the bq20z40/bq29330/bq29412 circuitmodule and the EV2300 PC interface board.
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7.1 Connecting the bq20z40/bq29330/bq29412 Circuit Module to a Battery Pack
+
-
LOAD/CHARGER
EV2300
COMPUTER
USB
SMBus
cable
+
-
SMB
7.2 PC Interface Connection
www.ti.com Hardware Connection
Figure 7 shows how to connect the bq20z40/bq29330/bq29412 circuit module to the cells and systemload/charger.
The cells must be connected in the following order:1. 4-Cell Pack: 1N (BAT-), 1P, 2P, 3P, then 4P (see Section 2.2 for definitions).2. 3-Cell Pack: 1N (BAT-), 1P, 2P, and then connect 4P and 3P together.3. 2-Cell Pack: 1N (BAT-), 1P, and then connect 4P, 3P, and 2P together
To start charge or discharge test, connect SYS PRES pin to PACK- pin to set SYS PRES state. To testsleep mode, disconnect the SYS PRES pin.
Figure 7. bq20z40/bq29330 Circuit Module Connection to Cells and System Load/Charger
The following steps configure the hardware for interface to the PC:1. Connect the bq20z40/bq29330-based smart battery to the EV2300 using the provided cable or theconnections shown in Table 4 .
Table 4. Circuit Module to EV2300 Connections
bq20z40/bq29330-Based Battery EV2300
SMBD SMBDSMBC SMBCVSS GND
2. Connect the PC USB cable to the EV2300 and the PC USB port.
The bq20z40EVM-001 is now set up for operation.
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8 Operation
8.1 Starting the Program
Operation www.ti.com
This section details the operation of the bq20z40 EVSW software. Note: the EV2300 driver does notsupport Windows Sleep or Hibernate. If communicating with the EV2300 or the EVM is a problem, firstunplug the USB cable, then plug it back in. If the problem persists, check to determine if the EVM is inShutdown mode. The bq20z40 can be awakened by momentarily applying a voltage higher than 5.5 V (butless than 25 V) at Pack+ pin of the EVM.
With the EV2300 and the bq20z40EVM connected to the computer, run bq20z40 EVSW from the Start |All Programs | Texas Instruments | bq Evaluation Software menu sequence. The SBS Data screenappears. Data begins to appear once the < Refresh> (single time scan) button is clicked, or when the< Keep Scanning> check box is checked. To disable the scan feature, deselect < Keep Scanning>.
The continuous scanning period can be set via the |Options| and |Set Scan Interval| menu selections. Therange for this interval is 0 ms to 65535 ms. Only items that are selected for scanning are scanned withinthis period.
The bq20z40 EVSW provides a logging function which logs the values that were last scanned by EVSW.To enable this function, select the Start Logging button; this causes the Keep Scanning button to beselected. When logging is Stopped, the keep scanning button is still selected and has to be manuallyunchecked.
The logging interval are specified under the |Options| menu with the maximum value of 65535 ms. TheLog interval cannot be smaller than the scan interval because this results in the same value being loggedat least twice.
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8.2 Setting Programmable bq20z40 and bq29330 Options
www.ti.com Operation
Figure 8. SBS Data Screen
This screen shows the SBS data set along with additional ManufacturersAccess() command informationsuch as individual cell measurements. Additional Flag and Static data can be viewed by selecting theappropriate tab at the bottom of the SBS screen.
Data such as SBS.ManufacturerName( ) is static and does not change. This data is viewed separatelyusing the Static Data tab available at the bottom of the screen.
Dragging the splitter bar (line that separates the Flags/Static data from SBS values) changes the height ofthe Flags/Static Data display. Selecting |View| then |Auto Arrange| returns the splitter bar to its originallocation.
The bq20z40 data flash comes configured per the default settings detailed in the bq20z40 data sheet(SLUS801 ). Ensure that the settings are correctly changed to match the pack and application for thebq20z40/bq29330 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 Flash screen.
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Operation www.ti.com
Figure 9. Data Flash Screen, 1st Level Safety Class
To read all the data from the bq20z40 data flash, click on menu option | Data Flash | Read All |.
To write to a data flash location, click on the desired location, enter the data, and press < Enter>, whichwrites the entire tab of flash data, or select menu option |Data Flash|Write All|. The data flash must beread before any writes are performed to avoid any incorrect data being written to the device.
The | File | Special Export | menu options allows the data flash to be exported, but it configures theexported data flash to a learned state ready for mass production use.
The data flash configuration can be saved to a file by selecting | File | Export |, and entering a file name. Adata flash file also can be retrieved in this way, imported, and written to the bq20z40 using the | Write All |button.
The configuration information of the bq29330 and module calibration data is held in the bq20z40 dataflash.
The bq20z40 allows for an automatic data flash export function, similar to the SBS Data logging function.This feature, when selected via | Options | Auto Export |, exports Data Flash to a sequential series of filesnamed as FilenameNNNNN.gg where N = a decimal number from 0 to 9.
The AutoExport interval is set under the | Options menu | with a minimum value of 15 seconds. TheAutoExport filename is set under the | Options menu |.
When a check is next to | AutoExport |, the AutoExport is in progress. The same menu selection is used toturn on/off AutoExport.
If the data flash screen is blank, then the bq20z40 that is being used may not be supported by thebqEVSW version that is being used. An upgrade may be required.
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9 Calibration Screen
9.1 How to Calibrate
9.2 To Calibrate the bq20z40
9.3 Board Offset Calibration
9.4 Pack Voltage Calibration
www.ti.com Calibration Screen
The bq20z40 must be calibrated using power supplies or a power supply and cell simulation resistors (200Ωto 1000 Ωeach) before cells are attached. Before the bq20z40 is calibrated:•Connect and measure a 2-A current source from 1N (-) and Pack- (+) to calibrate without using theFETs (calibration using the FETs is not recommended).•Measure the pack voltage from Batt+ to Batt- (total of cell voltages).•Measure the temperature of the pack.•Whether the foregoing steps are necessary depends on the type of calibration being performed.
Select the types of calibration to be performed.
Enter the measured values for the types selected (Except for CC Offset Calibration).
If Voltage Calibration is selected, enter the number of cells on the pack.
If Temperature Calibration is selected, select the sensor that is to be calibrated.
If the current source is connected between 1N and Pack-, then select the Off (Bypassed) check box in theFET Control section.
Press the Calibrate Part button.
This performs the offset calibration for the current offset of the board.
Remove any current source, load, or external voltage from the PACK terminals.
Press the Software Board Offset Calibration button.
This calibrates the voltage at the AFE Pack pin.
Ensure that Voltage Calibration has been performed for the pack. If Voltage Calibration is not performed,then Pack Voltage Calibration calibrates incorrectly.
Remove load/external voltage applied between Pack+ and Pack-.
Press the Pack Voltage button to calibrate.
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Calibration Screen www.ti.com
Figure 10. Calibration Screen
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10 Pro (Advanced) Screen
10.1 SMB Communication
10.2 Hex/Decimal Converter
10.3 Programming
www.ti.com Pro (Advanced) Screen
The set of read/write operations over SMBus are not specific to any gas gauge. These are provided asgeneral-purpose communication tools.
These two boxes convert between hexadecimal (hex) and decimal as soon as values are typed into theboxes. Invalid values can cause erroneous results.
When scaling converted hex values to a higher number of bytes, follow these rules:•When unsigned is selected, the left pad contains zeroes.•When signed is selected, the left pad contains zeroes for a positive number, or the left pad contains Ffor negative numbers.
Allows for device reprogramming from unencrypted and encrypted files.
Figure 11. Pro (Advanced) Screen
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11 Related Documentation from Texas Instruments
Related Documentation from Texas Instruments www.ti.com
To obtain a copy of any of the following TI documents, call the Texas Instruments Literature ResponseCenter at [phone] or the Product Information Center (PIC) at [phone]. When ordering,identify this document by its title and literature number. Updated documents can also be obtained throughthe TI Web site at www.ti.comDocuments: Literature Number:
bq20z40, SBS 1.1-Compliant Gas Gauge With Impedance Track SLUS801data sheetbq20z40 and bq20z45 Technical Reference Manual SLUU313bq29330, 2-, 3-, and 4-Cell Li-Ion or Li-Polymer Battery SLUS673Protective AFE data sheet
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EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must haveelectronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be completein terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmentalmeasures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit doesnot fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days fromthe date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYERAND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OFMERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claimsarising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and allappropriate precautions with regard to electrostatic discharge.EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANYINDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents orservices described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. Thisnotice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/orsafety programs, please contact the TI application engineer or visit www.ti.com/esh .No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, orcombination in which such TI products or services might be or are used.FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radiofrequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which aredesigned to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments maycause interference with radio communications, in which case the user at his own expense will be required to take whatever measures maybe required to correct this interference.
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 6 V to 25 V and the output voltage range of 0 V to 16.4 V.Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questionsconcerning the input range, please contact a TI field representative prior to connecting the input power.Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,please contact a TI field representative.During normal operation, some circuit components may have case temperatures greater than 60 °C. The EVM is designed to operateproperly with certain components above 60 °C as long as the input and output ranges are maintained. These components include but arenot limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identifiedusing the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation,please be aware that these devices may be very warm to the touch.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2009, Texas Instruments Incorporated

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