Texas Instruments DRV8308 User manual

User’s Guide
SLVUA41E –May 2015
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DRV8308 User’s Guide
This document describes how to use the DRV8308EVM to spin sensored brushless DC motors, as well
as a tuning process for the DRV8308 speed control system.
Table of Contents
1. The DRV8308EVM and motor..................................2
1.1 Overview..........................................................3
1.2 External lab equipment....................................3
1.3 Configuration jumpers......................................4
2. The GUI....................................................................7
2.1 Installation........................................................7
2.2 Quick guide to spin with open-loop PWM........ 8
2.3 Quick guide to spin with speed control............ 9
2.4 The third GUI tab..............................................9
2.5 If the GUI has slow performance......................10
3. Tuning the speed control system..............................10
3.1 Key registers....................................................10
3.2 Tuning process.................................................11

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1. The DRV8308EVM and motor
TelcoMotion DT4260-24-055-04H-TI

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1.1 Overview
The DRV8308EVM makes it easy to evaluate the DRV8308 device with different BLDC motors. The kit
includes the main PCB, a BLDC motor that uses DRV5013 Hall Effect sensors, a micro USB cable, and
a downloadable Windows application that controls and monitors the DRV8308 with a graphical user
interface (GUI).
DRV8308
FG/TACH (optional)
Hall signals & power
USB
input
USB-to-serial
UART
5V
LDO 3.3V MSP430
data
Configuration
jumpers
Socket for
EEPROM
data
External
clock
input
Bus isolation jumpers
SPI control
signals
Hall inputs
FG
input
9
RISENSE
VM
FETs Phase
inputs BLDC
Motor
FG OUT
testpoint
Power supply
Frequency
to voltage Flutter meterOscilloscope
VM
input
Figure 1. DRV8308EVM system diagram
1.2 External lab equipment
1. Power supply –The supply should be set to a voltage between 8.5V and 32V, and a current of
at least 1A. A higher current setting is better, as that helps maintain a stable VM voltage,
speeds spin-up time, and increases the torque capability. The DRV8308 will limit peak current
to 5A on this board, since the sense resistor is sized at 0.05Ω, and VLIMITER = 0.25V.
2. Flutter meter –When the motor rotates, it generates a periodic waveform on each Hall phase,
and optionally on the FG line. The DRV8308 register “FGSEL” sets which input to use for the
speed control loop and pass to FGOUT.

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Flutter meters can analyze the FGOUT signal and calculate a jitter percentage. This jitter, or
variation in edge timing, is a measure of motor speed consistency. Good flutter values are
typically in the 0.03% to 0.5% range. Some causes of jitter are:
a. Magnetic cogging force. Motors with high detent torque will have more speed variation
when spinning.
b. Non-ideal motor windings.
c. Improperly-tuned DRV8308 register settings when in Clock Frequency Mode. The
device’s speed control loop has configurable pole and zero frequencies and gain values,
and they significantly affect jitter performance.
Some BLDC outrunner motors have a PCB mounted to the backside with a board trace antenna
that senses magnetic reluctance. This “FG trace” is drawn like a square wave leading in a
circle. When the motor spins, a low-level sinusoidal voltage is generated on the trace. The
DRV8308 can use this signal to sense motor speed with FGSEL = 10b. Since implementations
often cause about 30-60 FG cycles per physical revolution, and there often only 3-6 Hall U
cycles per physical revolution, FG has an advantage of providing faster speed feedback, and
that can improve jitter performance. For motors that lack FG, it is best to set FGSEL = 00b to
use HALL U; this can achieve very similar performance as FG. Setting FGSEL = 01b for XOR
has been generally seen to produce worse results.
3. Frequency-to-voltage converter and oscilloscope –It is useful to convert the FGOUT frequency
to be represented by an analog voltage, and send the signal to a scope. This allows observing
spin-up and spin-down profiles, and any overshoot. Some flutter meters have an integrated
frequency to voltage converter.
4. Computer –The computer connects to the PCB with a USB cable, and the GUI controls the
MSP430G2553 microcontroller (MCU). This MCU can generate a clock, set High and Low
voltages on the control inputs, read the status outputs, and read/write DRV8308 registers using
SPI. The bus isolation jumpers provide a simple way to disconnect the MCU from the
DRV8308, if you want to use a different controller.
5. Function generator (not shown) –While the MCU can generate a clock with different duty cycles
and frequencies, you can instead use an external clock source attached to connector P5.
When doing this, be sure to disable the MCU clock to prevent contention. That can be done by
removing the CLKIN bus isolation jumper, or selecting GUI option “External Signal” in the first
two tabs, or unchecking “Enable MCU CLK” on third tab. While the MCU clock is not quite as
accurate as a function generator, there’s a negligible difference on flutter.
1.3 Configuration jumpers
The DRV8308EVM board has 3 groups of configuration jumpers.
Jumper
Description
HALL POWER
JP1
Hall sensor power is “5V”or “current”
JP2
DIFF HALL
JP3
Differential or single-ended Hall sensors
SMODE
JP4
SPI (GUI) or EEPROM mode

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Jumpers “HALL POWER”
Sensored BLDC motors typically use either Hall Effect ICs or elements. Most ICs can use 5V power,
while elements typically have power pins that have an equivalent circuit of a resistor, and current must
be limited to about 10mA.
Figure 2. Hall PWR/GND circuits
“VREG” is a regulated 5V output from the DRV8308. By installing a jumper on JP1 pins 2-3, and JP2,
5V power is available on the P3 terminal block for powering Hall ICs. VREG is only powered when the
DRV8308 is enabled, unless register VREG_EN is used.
“VSW” equals VM when the DRV8308 is enabled. By installing a jumper on JP1 pins 1-2, and
removing JP2, this circuit is available for Hall elements:
VM
+
2kΩ180Ω
_
HPWRHGND
Hall Elements
Figure 3. Circuit when setting Hall power to “current”
Here’s an example to calculate current: if VM = 24V, and 3 Hall elements that have a resistance of
400Ω are connected in parallel, 10.4mA will be supplied. Always refer to your Hall element
specifications to understand the proper current. The purpose of the 180Ω resistor is to bias-up the
common mode voltage of Hall element differential signals, since the DRV8308 requires VICM between
1.5V to 3.5V.
If you are unsure about whether to apply 5V or the current-limiting circuit, measure the resistance
between the Hall power and ground wires. If it is <250Ω, the current-limiting circuit should probably be
used. Hall elements can be easily damaged if too much current is allowed.

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Jumper “DIFF HALL”
Hall sensors output either a differential signal pair, or a single-ended open-drain. You can tell which
type your motor uses simply by counting the number of wires; a sensored BLDC typically has 3 phase
wires, 2 Hall power wires, and 3 or 6 Hall signal wires. 8 total mean single-ended; 11 total mean
differential (excluding optional FG or TACH wires).
The DRV8308 has differential comparators on the Hall inputs, and they can also accommodate single-
ended signals with the use of a few passive components.
When using differential Halls, directly connect the 6 Hall signals to the DRV8308 pins.
When using single-ended Halls, they require pull-ups, and the DRV8308 comparator’s “-”pins
should be biased with a middle voltage, so that a single-ended swing on the “+” pin is detected
like a differential voltage.
Jumper JP3 controls U7, an 8-line FET switch, and it decides when to connect the pull-ups and middle
voltage. Install JP3 when using differential Halls. Uninstall JP3 when using single-ended Halls and
connect wires to the “+” terminals of P3.
Figure 4. JP3 controls whether 6 connections are made
Jumper “SMODE”
When the DRV8308 powers up, it checks if pin SMODE is High or
Low to decide whether to load register data from an external
EEPROM, or from the internal non-volatile One-Time Programmable
memory (OTP). When the OTP method is used, the DRV8308 also
accepts SPI commands to read and write registers.
Install JP4 when using the GUI and SPI.
Uninstall JP4 when using an external EEPROM, and also install JP5a,
JP6a, JP7a, JP8a, and a 93C46B-compatible EEPROM into the DIP
socket (U6).

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2. The GUI
2.1 Installation
Step 1: Download and install the latest version of GUI Composer Runtime. You will need to register for
a TI account if you don’t already have one.
http://processors.wiki.ti.com/index.php/Category:GUI_Composer#GUI_Composer_Downloads
Step 2: Download and unzip the GUI: http://www.ti.com/lit/zip/slvc552.
Step 3: Install the USB driver by running: \USB driver\CDM v2.10.00 WHQL Certified.exe.
Step 4: Go to folder \Application\ and move folder DRV8308EVM_GUIv1.2 into directory
..\guicomposer\webapps\ (depending on where you installed GUI Composer during Step 1). If you
installed GUI Composer to the default directory, the folder is: C:\ti\guicomposer\webapps\.
Step 5: Create a shortcut for yourself to ..\guicomposer\webapps\DRV8308EVM_GUIv1.2\launcher.exe
by clicking and dragging the file while holding the Alt key.
Before running the GUI, you must first connect the USB cable between your computer and the
DRV8308EVM. Then, after you run launcher.exe, wait until the and icons
disappear before doing anything else; if they don’t disappear after a minute, it’s sometimes necessary
to close the GUI and re-run it.

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2.2 Quick guide to spin with open-loop PWM
Step 1: Set these jumpers:
Step 2: Connect the USB cable between the board and your computer, and run the GUI.
Step 3: Wire the included motor to the terminal blocks:
Step 4: Connect your power supply to the board VM and GND terminals. Set the supply to 24V with at
least 1A (higher current is better).
Step 5: With the GUI loaded and no symbols, set the PWM Duty Cycle to 40% and click ENABLE.
The motor should spin!
Next,
To change from counter-clockwise to clockwise, click DIR.
To change speed, use the duty cycle knob.
To apply sinusoidal commutation, first change MOD120 from 2048 to 3970, and then select
180° Sine Commutation. Note that when MOD120 = 3970, a 2.1x factor is applied to the input
duty cycle, so a 40% duty cycle input is treated like 84%.
To use no clock and command speed from a register, select “PWM from SPEED Register”.
Then the SPEED decimal value divided by 4095 is the input duty cycle.

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2.3 Quick guide to spin with speed control
The second GUI tab operates the DRV8308 in Clock Frequency Mode, utilizing the closed-loop speed
control system. It’s important to determine the right frequency for your desired RPM; for example:
If you are using FGSEL = 00b (Hall U), and the motor’s rotor has 8 magnet poles, there will be 4
Hall U cycles per revolution and RPM = fCLKIN/4 * 60.
If you are using FGSEL = 10b (FG), and there are 42 FG cycles per physical revolution, then
RPM = fCLKIN/42 * 60.
If you’re unsure of your motor’s number of Hall U cycles per revolution, you can test it by doing this:
disconnect the 3 phase wires, enable the DRV8308 (to apply Hall power), probe the Hall U testpoint,
and use your hand to rotate the motor 360° while counting the number of cycles.
The included TelcoMotion motor has 8 magnetic poles, and the below steps will involve a 100Hz fCLKIN,
so RPM will be 1500.
Step 1: Un-click ENABLE so the motor is stopped.
Step 2: Select the second GUI tab. Then:
Set AG_SETPT to 5 - 95Hz
Set LOOPGAIN to 200
Set MOD120 to 3970
Select CLK from MSP430
Step 3: Click ENABLE to spin at exactly 1500 RPM. Connecting a scope probe to FGOUT allows you
to observe the Hall U frequency. If you load the motor with your fingers, you will see power supply
current increase, but Hall U frequency stay the same since speed is locked. If you’re able to stop the
motor by squeezing hard enough, your power supply is probably set to 1A or less.
2.4 The third GUI tab
The last tab shows all the device registers, for the highest level of complexity and control. Changes
made to this tab stay in effect when switching back to the first two tabs.
By default, the “Auto Write” checkbox is enabled, so changes you make are immediately written
through SPI.
The button “Burn OTP Memory” permanently writes the DRV8308 non-volatile memory with the
registers shown. ENABLE must be active for it to work. After writing the OTP, whenever the DRV8308
is powered up with SMODE = Low, the default registers will be what was programmed.Here’s how
you can verify the OTP was successfully written: uncheck Auto Write, cycle power to the EVM, type a
random number into one of the register fields, click the Read All button, and verify the random number
gets overwritten to the correct value.

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2.5 If the GUI has slow performance
Some computers exhibit slow performance on the third GUI tab. 2 common causes are:
1. Too many Ports in Device Manager. Go there by accessing Start Control Panel System
Device Manager. Under Ports, the one for the EVM is named “USB Serial Port”. If there are
others listed, try disabling them with a right-click Disable. Then restart the GUI.
2. A slow computer with many programs running in the background. Try closing all extra
programs and disk scanners.
3. Tuning the speed control system
The DRV8308 Clock Frequency Mode for speed control performs best when the device registers are
tuned for a particular system’s motor, inertia, speed, and load torque.
3.1 Key registers
This first set of registers must be set correctly:
MOD120 –Always set this to 3970.
SPEED –This is the open-loop gain during spin-up, before LOCKn goes Low. It simply must
be high enough in order to reach the commanded RPM.
AUTOGAIN –When enabled, the DRV8308 scales LOOPGAIN with RPM, because more gain is
needed for more speed. This is a valuable feature and should generally be left
enabled. Then ScaledGain = LOOPGAIN * fCLKIN/AG_SETPT.
AG_SETPT –This setpoint effectively sets the range for AUTOGAIN. Simply use the setting that
is closest to fCLKIN (see the DRV8308 datasheet register descriptions).
AUTOADV –When enabled, the DRV8308 more aggressively scales ADVANCE with RPM:
ScaledAdvance = ADVANCE * fHALLU/AA_SETPT. Note that without this,
ADVANCE by itself already scales with speed since each value shifts timing by
0.1% of the Hall U period. Disable AUTOADV initially; once a system is well-tuned,
you can experiment with AUTOADV to potentially improve performance.
AA_SETPT –This only applies when AUTOADV is enabled. Use the setting closest to the
frequency of Hall U.
IDRIVE –This sets the predriver output current and directly controls the external FET VGS
turn-on time. Unless high current FETs are used, lower values are generally better,
to minimize switching noise.
FGSEL –If an FG Sense trace is not used, it is generally best to set FGSEL to 0 (HALL_U).

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These next registers should be tuned for a particular system:
ADVANCE –This adjusts the timing shift between when the DRV8308 receives Hall signals and
commutation. While a motor is running, ADVANCE can be modified in realtime (if
AUTOADV is disabled), and you will instantly see the difference in power supply
current. Lower current is generally better, but flutter performance can be a tradeoff.
LOOPGAIN –This gain primarily affects max RPM, max torque, and startup speed overshoot. If
it’s too low, the motor won’t spin up to the commanded RPM, or the torque
capability may be limited. If it’s too high, motor speed will initially overshoot.
SPDGAIN –This gain affects how aggressively error is compensated. If it’s too high, speed will
oscillate around the target speed. If it’s too low, flutter may be higher.
FILK1 –Sets the Pole1 frequency.
FILK2 –Sets the Zero1 frequency.
COMK1 –Sets the Pole2 frequency.
COMK2 –Sets the Zero2 frequency.
3.2 Tuning process
Tuning a motor system is a trial-and-error process. The following steps are a general guide. The GUI
loads with default register values that attempt to have reasonable filter settings.
Step 1: Use the first tab to run in PWM mode. You might need to try different wire connections and
HALLPOL to get your motor to consistently spin. After that, while spinning change ADVANCE and find
the value that causes the lowest power supply current and audible motor noise. Then stop the motor
by bringing ENABLE low.
Step 2: Determine the appropriate clock frequency, fCLKIN (see example).
Select the third GUI tab, and:
Set AG_SETPT closest to your fCLKIN.
Set MOD120 to 3970
Set SPEED to 4000
Turn on the clock, and start the motor with ENABLE.
If the motor spins very roughly,
Try reducing or increasing fCLKIN to find a working case as a baseline reference.
Try changing the filters (FILK1/FILK2/COMK1/COMK2) with different combinations in
increments of 150.Spend some time to find good values.
Try increasing SPDGAIN and LOOPGAIN.
Step 3: By now, the motor should spin smoothly, but the frequency of the signal on FGOUT might not
match fCLKIN. If the two frequencies don’t match, speed is not locked. Many times that can be fixed by
increasing LOOPGAIN or SPEED.

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Step 4: Now, the motor should be spinning with the FGOUT frequency matching fCLKIN.If you load the
motor using your hand, it should maintain the same RPM and FGOUT frequency. To increase the load
capability, try increasing LOOPGAIN, or you may need to decrease the value of the RSENSE resistor to
allow more motor current.
It’s useful to now determine the minimum “total gain”needed to reach your target RPM and torque
drive. To do this, keep decreasing LOOPGAIN and toggling ENABLE, to find the LOOPGAIN that
prevents fFGOUT from reaching fCLKIN. The filter registers of course affect pole and zero frequencies of
the control system; they also affect gain in the same way as LOOPGAIN, where:
Total gain = LOOPGAIN * (2*FILK2/FILK1) * (0.5*COMK2/COMK1).
Inside the downloaded Board Files and Software, open this file: \Application\Filter calculator.xls. Enter
your filter values and LOOPGAIN into the green cells, and look at the “Total gain”. This is the minimum
gain your system needs to reach the commanded RPM.
In future trials, changing the filters (to improve flutter and dynamic performance) will also change total
gain, and the calculator should be used to determine the right value for LOOPGAIN, in order to keep
total gain at least 20% above the minimum. Being 1.5-3x above the minimum is often ok, and the
primary consequence of having too much total gain is that startup speed can overshoot. Note that
more gain is needed to drive more torque.
Step 5: To optimize flutter performance, vary ADVANCE, SPDGAIN, and many combinations of
FILK1/FILK2/COMK1/COMK2. These filter settings can be changed in realtime while the motor is
spinning, but the new “total gain” is only updated when the motor restarts (technically, it’s when LOCKn
transitions to Low if AUTOGAIN is enabled).
In many cases it works well to set Pole1 to a much higher frequency than the others, and set Zero2 to
Pole2 to a frequency band between Zero1 and Pole1.
Try many combinations, and hopefully you will find good settings within a few hours. Good luck! Feel
free to post any questions to the TI E2E Forum online.

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【無線電波を送信する製品の開発キットをお使いになる際の注意事項】
本開発キットは技術基準適合証明を受けておりません。
本製品のご使用に際しては、電波法遵守のため、以下のいずれかの措置を取っていただく必要がありますのでご注意ください。
1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用
いただく。
2. 実験局の免許を取得後ご使用いただく。
3. 技術基準適合証明を取得後ご使用いただく。
なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。
上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。
日本テキサス・インスツルメンツ株式会社
東京都新宿区西新宿６丁目２４番１号
西新宿三井ビル
3.3.3 Notice for EVMs for Power Line Communication: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page
電力線搬送波通信についての開発キットをお使いになる際の注意事項については、次のところをご覧くださ
い。http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page
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4EVM Use Restrictions and Warnings:
4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT
LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS.
4.2 User must read and apply the user guide and other available documentation provided by TI regarding the EVM prior to handling
or using the EVM, including without limitation any warning or restriction notices. The notices contain important safety information
related to, for example, temperatures and voltages.
4.3 Safety-Related Warnings and Restrictions:
4.3.1 User shall operate the EVM within TI’s recommended specifications and environmental considerations stated in the user
guide, other available documentation provided by TI, and any other applicable requirements and employ reasonable and
customary safeguards. Exceeding the specified performance ratings and specifications (including but not limited to input
and output voltage, current, power, and environmental ranges) for the EVM may cause personal injury or death, or
property damage. If there are questions concerning performance ratings and specifications, User should contact a TI
field representative prior to connecting interface electronics including input power and intended loads. Any loads applied
outside of the specified output range may also result in unintended and/or inaccurate operation and/or possible
permanent damage to the EVM and/or interface electronics. Please consult the EVM user 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, even with the inputs and outputs kept within the specified allowable ranges, some circuit
components may have elevated case temperatures. These components include but are not limited to linear regulators,
switching transistors, pass transistors, current sense resistors, and heat sinks, which can be identified using the
information in the associated documentation. When working with the EVM, please be aware that the EVM may become
very warm.
4.3.2 EVMs are intended solely for use by technically qualified, professional electronics experts who are familiar with the
dangers and application risks associated with handling electrical mechanical components, systems, and subsystems.
User assumes all responsibility and liability for proper and safe handling and use of the EVM by User or its employees,
affiliates, contractors or designees. User assumes all responsibility and liability to ensure that any interfaces (electronic
and/or mechanical) between the EVM and any human body are designed with suitable isolation and means to safely
limit accessible leakage currents to minimize the risk of electrical shock hazard. User assumes all responsibility and
liability for any improper or unsafe handling or use of the EVM by User or its employees, affiliates, contractors or
designees.
4.4 User assumes all responsibility and liability to determine whether the EVM is subject to any applicable international, federal,
state, or local laws and regulations related to User’s handling and use of the EVM and, if applicable, User assumes all
responsibility and liability for compliance in all respects with such laws and regulations. User assumes all responsibility and
liability for proper disposal and recycling of the EVM consistent with all applicable international, federal, state, and local
requirements.
5. Accuracy of Information: To the extent TI provides information on the availability and function of EVMs, TI attempts to be as accurate
as possible. However, TI does not warrant the accuracy of EVM descriptions, EVM availability or other information on its websites as
accurate, complete, reliable, current, or error-free.
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6. Disclaimers:
6.1 EXCEPT AS SET FORTH ABOVE, EVMS AND ANY WRITTEN DESIGN MATERIALS PROVIDED WITH THE EVM (AND THE
DESIGN OF THE EVM ITSELF) ARE PROVIDED "AS IS" AND "WITH ALL FAULTS." TI DISCLAIMS ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, REGARDING SUCH ITEMS, INCLUDING BUT NOT LIMITED TO ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF ANY
THIRD PARTY PATENTS, COPYRIGHTS, TRADE SECRETS OR OTHER INTELLECTUAL PROPERTY RIGHTS.
6.2 EXCEPT FOR THE LIMITED RIGHT TO USE THE EVM SET FORTH HEREIN, NOTHING IN THESE TERMS AND
CONDITIONS SHALL BE CONSTRUED AS GRANTING OR CONFERRING ANY RIGHTS BY LICENSE, PATENT, OR ANY
OTHER INDUSTRIAL OR INTELLECTUAL PROPERTY RIGHT OF TI, ITS SUPPLIERS/LICENSORS OR ANY OTHER THIRD
PARTY, TO USE THE EVM IN ANY FINISHED END-USER OR READY-TO-USE FINAL PRODUCT, OR FOR ANY
INVENTION, DISCOVERY OR IMPROVEMENT MADE, CONCEIVED OR ACQUIRED PRIOR TO OR AFTER DELIVERY OF
THE EVM.
7. USER'S INDEMNITY OBLIGATIONS AND REPRESENTATIONS. USER WILL DEFEND, INDEMNIFY AND HOLD TI, ITS
LICENSORS AND THEIR REPRESENTATIVES HARMLESS FROM AND AGAINST ANY AND ALL CLAIMS, DAMAGES, LOSSES,
EXPENSES, COSTS AND LIABILITIES (COLLECTIVELY, "CLAIMS") ARISING OUT OF OR IN CONNECTION WITH ANY
HANDLING OR USE OF THE EVM THAT IS NOT IN ACCORDANCE WITH THESE TERMS AND CONDITIONS. THIS OBLIGATION
SHALL APPLY WHETHER CLAIMS ARISE UNDER STATUTE, REGULATION, OR THE LAW OF TORT, CONTRACT OR ANY
OTHER LEGAL THEORY, AND EVEN IF THE EVM FAILS TO PERFORM AS DESCRIBED OR EXPECTED.
8. Limitations on Damages and Liability:
8.1 General Limitations. IN NO EVENT SHALL TI BE LIABLE FOR ANY SPECIAL, COLLATERAL, INDIRECT, PUNITIVE,
INCIDENTAL, CONSEQUENTIAL, OR EXEMPLARY DAMAGES IN CONNECTION WITH OR ARISING OUT OF THESE
TERMS ANDCONDITIONS OR THE USE OF THE EVMS PROVIDED HEREUNDER, REGARDLESS OF WHETHER TI HAS
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. EXCLUDED DAMAGES INCLUDE, BUT ARE NOT LIMITED
TO, COST OF REMOVAL OR REINSTALLATION, ANCILLARY COSTS TO THE PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES, RETESTING, OUTSIDE COMPUTER TIME, LABOR COSTS, LOSS OF GOODWILL, LOSS OF PROFITS,
LOSS OF SAVINGS, LOSS OF USE, LOSS OF DATA, OR BUSINESS INTERRUPTION. NO CLAIM, SUIT OR ACTION SHALL
BE BROUGHT AGAINST TI MORE THAN ONE YEAR AFTER THE RELATED CAUSE OF ACTION HAS OCCURRED.
8.2 Specific Limitations. IN NO EVENT SHALL TI'S AGGREGATE LIABILITY FROM ANY WARRANTY OR OTHER OBLIGATION
ARISING OUT OF OR IN CONNECTION WITH THESE TERMS AND CONDITIONS, OR ANY USE OF ANY TI EVM
PROVIDED HEREUNDER, EXCEED THE TOTAL AMOUNT PAID TO TI FOR THE PARTICULAR UNITS SOLD UNDER
THESE TERMS AND CONDITIONS WITH RESPECT TO WHICH LOSSES OR DAMAGES ARE CLAIMED. THE EXISTENCE
OF MORE THAN ONE CLAIM AGAINST THE PARTICULAR UNITS SOLD TO USER UNDER THESE TERMS AND
CONDITIONS SHALL NOT ENLARGE OR EXTEND THIS LIMIT.
9. Return Policy. Except as otherwise provided, TI does not offer any refunds, returns, or exchanges. Furthermore, no return of EVM(s)
will be accepted if the package has been opened and no return of the EVM(s) will be accepted if they are damaged or otherwise not in
a resalable condition. If User feels it has been incorrectly charged for the EVM(s) it ordered or that delivery violates the applicable
order, User should contact TI. All refunds will be made in full within thirty (30) working days from the return of the components(s),
excluding any postage or packaging costs.
10. Governing Law: These terms and conditions shall be governed by and interpreted in accordance with the laws of the State of Texas,
without reference to conflict-of-laws principles. User agrees that non-exclusive jurisdiction for any dispute arising out of or relating to
these terms and conditions lies within courts located in the State of Texas and consents to venue in Dallas County, Texas.
Notwithstanding the foregoing, any judgment may be enforced in any United States or foreign court, and TI may seek injunctive relief
in any United States or foreign court.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2015, Texas Instruments Incorporated
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IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other
changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest
issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and
complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale
supplied at the time of order acknowledgment.
TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms
and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary
to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily
performed.
TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and
applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or
other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information
published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or
endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the
third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration
and is accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such altered
documentation. Information of third parties may be subject to additional restrictions.
Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service
voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice.
TI is not responsible or liable for any such statements.
Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements
concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support
that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which
anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause
harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use
of any TI components in safety-critical applications.
In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to
help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and
requirements. Nonetheless, such components are subject to these terms.
No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties
have executed a special agreement specifically governing such use.
Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in
military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components
which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and
regulatory requirements in connection with such use.
TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of
non-designated products, TI will not be responsible for any failure to meet ISO/TS16949.
Products Applications
Audio www.ti.com/audio Automotive and Transportation www.ti.com/automotive
Amplifiers amplifier.ti.com Communications and Telecom www.ti.com/communications
Data Converters dataconverter.ti.com Computers and Peripherals www.ti.com/computers
DLP® Products www.dlp.com Consumer Electronics www.ti.com/consumer-apps
DSP dsp.ti.com Energy and Lighting www.ti.com/energy
Clocks and Timers www.ti.com/clocks Industrial www.ti.com/industrial
Interface interface.ti.com Medical www.ti.com/medical
Logic logic.ti.com Security www.ti.com/security
Power Mgmt power.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense
Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video
RFID www.ti-rfid.com
OMAP Applications Processors www.ti.com/omap TI E2E Community e2e.ti.com
Wireless Connectivity www.ti.com/wirelessconnectivity
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2015, Texas Instruments Incorporated

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