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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.
1. The DRV8308EVM and motor..................................
2. The GUI ....................................................................
3. Tuning the speed control system ..............................
Table of Contents
1.1 Overview ..........................................................
1.2 External lab equipment ....................................
1.3 Configuration jumpers......................................
2.1 Installation........................................................
2.3 Quick guide to spin with speed control............
2.4 The third GUI tab..............................................
2.5 If the GUI has slow performance......................
3.1 Key registers ....................................................
3.2 Tuning process.................................................
SLVUA41E - May 2015
DRV8308 User's Guide
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Summary of Contents for Texas Instruments DRV8308
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Page 1: Table Of Contents
SLVUA41E – May 2015 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........ -
Page 2: The Drv8308Evm And Motor
SLVUA41E 1. The DRV8308EVM and motor TelcoMotion DT4260-24-055-04H-TI... -
Page 3: Overview
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. -
Page 4: Configuration Jumpers
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. - Page 5 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 V between 1.5V to 3.5V.
- Page 6 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.
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Page 7: The Gui
SLVUA41E 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. -
Page 8: Quick Guide To Spin With Open-Loop Pwm
SLVUA41E 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. -
Page 9: Quick Guide To Spin With Speed Control
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. -
Page 10: If The Gui Has Slow Performance
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: –... -
Page 11: Tuning Process
SLVUA41E 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. - Page 12 SLVUA41E Step 4: Now, the motor should be spinning with the FGOUT frequency matching f . If you load the CLKIN 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 R resistor to SENSE allow more motor current.
- Page 13 STANDARD TERMS AND CONDITIONS FOR EVALUATION MODULES Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, or documentation (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms and conditions set forth herein. Acceptance of the EVM is expressly subject to the following terms and conditions.
- Page 14 FCC Interference Statement for Class B EVM devices NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
- Page 15 【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 SPACER EVM 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.
- Page 16 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...
- Page 17 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.
- Page 18 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments DRV8308EVM...
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