DRV8844EVM

User's Guide SLVU762 – August 2012 DRV8844 Evaluation Module This document is provided as a supplement to the DRV8844 datasheet (SLVSBA2 ). It details the hardware implementation of the DRV8844EVM customer evaluation module (EVM). 1 2 3 4 5 Contents Introduction .................................................................................................................. Block Diagram ............................................................................................................... 2.1 Power Connectors ................................................................................................. 2.2 Test Stakes ......................................................................................................... 2.3 Jumpers ............................................................................................................. 2.4 Power Outputs ...................................................................................................... Installing Drivers and Software ............................................................................................ 3.1 Installing the FTDI USB Driver ................................................................................... 3.2 Installing the DRV8844 Evaluation Board Windows Application Software ................................. 3.3 Running the Windows Application Software .................................................................... Windows Application ........................................................................................................ 4.1 Menu ................................................................................................................. 4.2 DRV8844 GPIO Control Signals ................................................................................. 4.3 PWM Control ....................................................................................................... Schematic .................................................................................................................... 1 2 2 2 3 3 3 3 3 3 4 4 5 5 6 List of Figures 1 2 3 4 1 .................................................................................................. DRV8844 Jumpers .......................................................................................................... DRV8844EVM.exe Main Screen .......................................................................................... DRV8844 PWM Control Window ......................................................................................... DRV8844 Block Diagram 2 3 4 5 Introduction The DRV8844 customer evaluation module (EVM) is a platform revolving around the DRV8844, a medium voltage, quadruple half-H-bridge driver. This device is designed to drive four independent inductive or resistive loads, such as solenoids, relays, or lamps. The EVM can also drive two brushed DC motors or either a unipolar or a bipolar stepper motor not requiring integrated current regulation. The EVM houses an MSP430 microcontroller and a USB interface chip. The USB chip allows for serial communications from a PC computer where a Windows® application schedules serial commands. These commands can control each of the device’s signals, or control both devices at the same time to drive a stepper motor. The microcontroller firmware offers the generation of all the control signals often employed to enable or disable the power stage and four PWM’s to articulate each power output with a configurable duty cycle. This users guide details the operation of the EVM, as well as the hardware configurability of the evaluation module. SLVU762 – August 2012 Submit Documentation Feedback DRV8844 Evaluation Module Copyright © 2012, Texas Instruments Incorporated 1 Block Diagram 2 www.ti.com Block Diagram Figure 1 shows the DRV8844 block diagram. VM Power DRV8844 Test Stakes Test Stakes Power Outputs JP2 Jumpers USB Conn USB Chip MSP430 Figure 1. DRV8844 Block Diagram 2.1 Power Connectors This EVM offers access to the Motor Voltage (VM) power rail via a terminal block (J3). A set of test clips in parallel with the terminal block allows monitoring of the input power rail. Since the DRV8844 can be utilized with either split power supplies (+VM/-VM) or with a single power supply (+VM), jumper JP2 allows the LGND and –VM nodes to be connected together when using the single power-supply implementation. The VM must be applied according to the parameters recommended in the DRV8844 datasheet (SLVSBA2 ). 2.2 Test Stakes Test stakes surrounding the DRV8844 allow access to monitoring all control and output signals. 2 DRV8844 Evaluation Module SLVU762 – August 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Installing Drivers and Software www.ti.com 2.3 Jumpers The EVM contains one row of ten 2-pin jumpers (JP3), which are removable to isolate the microcontroller resource as a controlling source to the power stage. If a particular signal is interfaced externally, attach the controlling signal to either the test stakes or the driver side of JP3. EN1 nSLEEP nRESET IN1 IN2 IN3 IN4 EN1 EN2 EN3 DRV8844 Driver Side JP3 Microcontroller Side Figure 2. DRV8844 Jumpers 2.4 Power Outputs There are two ways of connecting the desired load into the EVM: four pin header (J1) or four position terminal block (J2). 3 Installing Drivers and Software 3.1 Installing the FTDI USB Driver The USB driver is easily installed on any Windows system (Windows XP 32 or 64 bits, Windows Vista, Windows 7) by double-clicking the included CDM20814_Setup.exe. The USB peripheral is installed as a virtual COM port (VCP). The Windows application enumerates all available COM Ports during startup. While connecting, the application attempts to communicate with the module. Once communications have been successfully established, the EVM is ready for evaluation purposes. 3.2 Installing the DRV8844 Evaluation Board Windows Application Software The Windows application is installed by running the Setup.exe file found in the DRV8844 folder. 3.3 Running the Windows Application Software Start this application by clicking Start → Programs → Texas Instruments Inc. → DRV8844EVM. SLVU762 – August 2012 Submit Documentation Feedback DRV8844 Evaluation Module Copyright © 2012, Texas Instruments Incorporated 3 Windows Application 4 www.ti.com Windows Application The DRV8844EVM Windows application is the software counterpart for the DRV8844 EVM allowing the connection of a PC to the MSP430F2617 microcontroller though a USB interface chip. Once connection is established and commands are sent, the microcontroller takes care of configuring control signals and PWM generation. The Graphical User Interface (GUI) is designed for testing all of the DRV8844 device’s functionality without requiring hardware changes. Figure 3 shows the DRV8844EVM.exe main screen. Figure 3. DRV8844EVM.exe Main Screen All the control signals needed to manage the power outputs enablement/disablement (ENx), power output polarity selection (INx), device sleep mode (nSLEEP), and reset mode (nRESET) are made available throughout pictographic pins at the Pin Control/Information frame. Sliders at the PWM control frame allow for each respective output’s PWM duty cycle to be dynamically modified. 4.1 Menu The menu at the top of the application offers a series of quick options for behavior of the COM port. File: Exit – Terminates the Application Connect: Opens the Serial Port. When this menu item is pressed, its caption changes to Disconnect Disconnect: Closes the Serial Port. When this menu item is pressed, its caption changes to Connect COMx: A series of available COM ports is shown. To determine which COM port is the VCP, view the Windows' Device Manager and determine which one of the enumerated COM ports is using the FTDI driver. 4 DRV8844 Evaluation Module SLVU762 – August 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Windows Application www.ti.com After opening the application, the order of events should be: 1. Select the COM port from the COMx drop-down box. 2. Press Connect. If COM ports are available, the application searches for the EVM. If no EVM is found, an error message notifies the user. If the port is available and communications are successfully made, the menu item changes its Connect caption to Disconnect. Pressing Disconnect to disables the serial communications. 3. After pressing any command button, should return on the bottom status bar as an acknowledgment of proper communications taking place with the board. 4. The application is now ready for use. 5. Closing down the application (through the Close X or through File → Exit) closes the serial port connection, it is not necessary to press Disconnect before closing down the application. 4.2 DRV8844 GPIO Control Signals Once the application is communicating with the interface board, the control signals can be actuated by clicking on the respective pin. A signal with a logic LO state is represented with the color red, whereas the same signal is represented with the color green once its state is switched to logic HI. 4.3 PWM Control The four INx signals are actuated through a series of PWM outputs generated by the onboard MSP430 microcontroller. The PWM duty cycle is programmed by either moving the respective slider or changing the duty cycle percentage on the number box, see Figure 4. When engaging the PWM sliders, the output enters PWM mode. The respective ENx pin turns from either green or red, to orange, depicting a PWM-based output. Pressing the orange pin button again takes the same output to 100% duty cycle, while the orange pin changes to a green color. Whenever the PWM sliders are moved to the 0% or 100% position, the respective pin changes to a red or green color respectively. That is, for each ENx pin, red stands for 0% duty cycle (or channel off), whereas green stands for 100% duty cycle (or channel full on). Figure 4. DRV8844 PWM Control Window SLVU762 – August 2012 Submit Documentation Feedback DRV8844 Evaluation Module Copyright © 2012, Texas Instruments Incorporated 5 Schematic 5 www.ti.com Schematic The schematic is available in PDF form (SCH.pdf) inside the EVM_Related folder on the downloadable EVM software package. 6 DRV8844 Evaluation Module SLVU762 – August 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. Please read the User's Guide and, specifically, the Warnings and Restrictions notice in the User's Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For additional information on TI's environmental and/or safety programs, please visit www.ti.com/esh or contact TI. No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or combination in which such TI products or services might be or are used. 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 or services described herein. REGULATORY COMPLIANCE INFORMATION As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompanying hardware may or may not be subject to the Federal Communications Commission (FCC) and Industry Canada (IC) rules. For EVMs not subject to the above rules, this evaluation board/kit/module is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end product fit for general consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC or ICES-003 rules, which are designed to provide reasonable protection against radio frequency interference. Operation of the equipment may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference. General Statement for EVMs including a radio User Power/Frequency Use Obligations: This radio is intended for development/professional use only in legally allocated frequency and power limits. Any use of radio frequencies and/or power availability of this EVM and its development application(s) must comply with local laws governing radio spectrum allocation and power limits for this evaluation module. It is the user’s sole responsibility to only operate this radio in legally acceptable frequency space and within legally mandated power limitations. Any exceptions to this are strictly prohibited and unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory authorities, which is responsibility of user including its acceptable authorization. For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant Caution This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. FCC Interference Statement for Class A EVM devices This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. FCC Interference Statement for Class B EVM devices 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. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: • Reorient or relocate the receiving antenna. • Increase the separation between the equipment and receiver. • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help. For EVMs annotated as IC – INDUSTRY CANADA Compliant This Class A or B digital apparatus complies with Canadian ICES-003. Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. Concerning EVMs including radio transmitters This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Concerning EVMs including detachable antennas Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication. This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device. Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada. Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de l'utilisateur pour actionner l'équipement. Concernant les EVMs avec appareils radio Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement. Concernant les EVMs avec antennes détachables Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante. Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le manuel d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur. SPACER SPACER SPACER SPACER SPACER SPACER SPACER SPACER 【Important Notice for Users of this Product in Japan】 】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. 2. 3. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for Enforcement of Radio Law of Japan, Use this product only after you obtained the license of Test Radio Station as provided in Radio Law of Japan with respect to this product, or Use of this product only after you obtained the Technical Regulations Conformity Certification as provided in Radio Law of Japan with respect to this product. Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan. 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It is intended solely for use for preliminary feasibility evaluation in laboratory/development environments by technically qualified electronics experts who are familiar with the dangers and application risks associated with handling electrical mechanical components, systems and subsystems. It should not be used as all or part of a finished end product. Your Sole Responsibility and Risk. You acknowledge, represent and agree that: 1. 2. 3. 4. You have unique knowledge concerning Federal, State and local regulatory requirements (including but not limited to Food and Drug Administration regulations, if applicable) which relate to your products and which relate to your use (and/or that of your employees, affiliates, contractors or designees) of the EVM for evaluation, testing and other purposes. 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It is important to operate this EVM within TI’s recommended specifications and environmental considerations per the user guidelines. Exceeding the specified EVM ratings (including but not limited to input and output voltage, current, power, and environmental ranges) may cause property damage, personal injury or death. If there are questions concerning these ratings please 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 result in unintended and/or inaccurate operation and/or possible permanent damage to the EVM and/or interface electronics. 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 as long as the input and output are maintained at a normal ambient operating temperature. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors which can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during normal operation, please be aware that these devices may be very warm to the touch. As with all electronic evaluation tools, only qualified personnel knowledgeable in electronic measurement and diagnostics normally found in development environments should use these EVMs. Agreement to Defend, Indemnify and Hold Harmless. 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