Texas Instruments DRV2667EVM-CT User manual

User's Guide
SLOU323–June 2013
DRV2667 Evaluation Module
The DRV2667 is a digital interface, high-voltage driver designed to control Piezo actuators with voltages
between 40 Vpp and 200 Vpp. The DRV2667 eliminates many design complexities of driving Piezo by
including an integrated 100-Vpp boost converter and 200-Vpp differential output amplifier. In addition, the
digital control interface (I2C™) includes real-time waveform playback, a waveform generator, and
embedded RAM for waveform storage.
The DRV2667EVM-CT Evaluation Module (EVM) kit is a complete demonstration and evaluation platform
for the DRV2667. The kit includes a microcontroller, Piezo actuator, sample waveforms, and capacitive
touch buttons which can be used to completely demonstrate and evaluate the DRV2667.
This document contains instructions for setup and operation of the DRV2667EVM-CT, as well as an in-
depth description and examples of haptic waveforms for Piezo actuators.
Evaluation kit contents
• DRV2667EVM-CT demonstration and evaluation board
• Mini-USB cable
Tools needed for programming and advanced configuration
• Code Composer Studio™ (CCS) or IAR Embedded Workbench IDE for MSP430
• MSP430 LaunchPad (MSP-EXP430G2) or MSP430-FET430UIF hardware programming tool
• DRV2667EVM-CT firmware
WARNING
This evaluation board contains high voltages, up to 200 Vpp.
Please use the necessary precautions when using this board.
Code Composer Studio is a trademark of Texas Instruments.
I2C is a trademark of NXP.
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Contents
1 Getting Started .............................................................................................................. 4
1.1 Evaluation Module Operating Parameters ...................................................................... 5
1.2 Quick-Start Board Setup .......................................................................................... 5
2 DRV2667 Embedded Software ........................................................................................... 6
2.1 Demo Mode ......................................................................................................... 7
2.2 Demo Mode Descriptions ......................................................................................... 8
2.3 RAM Library Mode ............................................................................................... 14
2.4 RAM Library Effects List ......................................................................................... 14
2.5 Design & Test Mode ............................................................................................. 14
2.6 Return to Demo Mode ........................................................................................... 16
3 Hardware Configuration .................................................................................................. 17
3.1 Input and Output Overview ...................................................................................... 17
3.2 Power Supply ..................................................................................................... 17
3.3 External Actuator ................................................................................................. 18
3.4 External I2C Input ................................................................................................. 18
3.5 Analog/PWM Input ............................................................................................... 19
3.6 Programming the Boost Converter ............................................................................. 19
4 MSP430 Control and Firmware .......................................................................................... 23
4.1 Modifying and Loading Firmware ............................................................................... 23
4.2 MSP430 Pin-Out .................................................................................................. 25
5 Schematic, Printed-Circuit Board Layouts, and Bill of Materials .................................................... 26
5.1 Schematics ........................................................................................................ 26
5.2 PCB Layouts ...................................................................................................... 27
5.3 Bill of Materials .................................................................................................... 30
List of Figures
1 Board Diagram .............................................................................................................. 4
2 DRV2667EVM-CT Mode Sets............................................................................................. 6
3 B1 – Alert 1 .................................................................................................................. 8
4 B1 – Alert 1 Continuous Repeat .......................................................................................... 8
5 B2 – Alert 2 .................................................................................................................. 8
6 B2 - Alert 2 Continuous Repeat........................................................................................... 8
7 B3 – Alert 3 .................................................................................................................. 9
8 B3 – Alert 3 Continuous Repeat .......................................................................................... 9
9 B4 – Alert 4 .................................................................................................................. 9
10 B4 – Alert 4 Continuous Repeat .......................................................................................... 9
11 B2 – Click and Release 1 ................................................................................................ 10
12 B2 – Click and Release 2 ................................................................................................ 10
13 Ramp and Release........................................................................................................ 10
14 B1 – Ramp Up............................................................................................................. 11
15 B3 – Click Bounce......................................................................................................... 11
16 B4 – Pulse.................................................................................................................. 11
17 B1 – Sharp Click Using FIFO............................................................................................ 12
18 B2 – Bump using FIFO ................................................................................................... 12
19 B4 – Robotic Click using RAM........................................................................................... 12
20 B3 – Audio In .............................................................................................................. 13
21 DRV2667EVM-CT Power Diagram ..................................................................................... 17
22 Output Terminal Block and Test Points ................................................................................ 18
23 External I2C Input.......................................................................................................... 18
24 External Analog/PWM Input.............................................................................................. 19
25 Boost Voltage Programming Resistors................................................................................. 20
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26 DRV2667EVM-CT LaunchPad Connection............................................................................ 24
27 DRV2667EVM-CT Schematic............................................................................................ 26
28 DRV2667EVM-CT Top Silkscreen ...................................................................................... 27
29 DRV2667EVM-CT Top Copper.......................................................................................... 27
30 DRV2667EVM-CT Copper Layer 2 ..................................................................................... 28
31 DRV2667EVM-CT Copper Layer 3 ..................................................................................... 28
32 DRV2667EVM-CT Bottom Copper Layer .............................................................................. 29
List of Tables
1 EVM Operating Parameters ............................................................................................... 5
2 Default Jumper Settings.................................................................................................... 5
3 DRV2667EVM-CT Demo Mode........................................................................................... 7
4 DRV2667EVM-CT Library Modes....................................................................................... 14
5 DRV2667EVM-CT Binary Modes........................................................................................ 15
6 Hardware Overview ....................................................................................................... 17
7 Power Supply Configuration Options .................................................................................. 17
8 Boost Voltage using MSP430 GPIO Control........................................................................... 20
9 Boost Voltage and Gain Settings (R1 and R2 Only).................................................................. 21
10 Boost Converter Inductor Selection..................................................................................... 21
11 MSP430 Pin-Out........................................................................................................... 25
12 DRV2667EVM-CT Bill of Materials...................................................................................... 30
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Actuator
DRV2667
MSP430
OUT
VBAT
SBW
MSP
DRV
JP2 JP3
ANALOG
USB Power
External
Power
Power Select Pins
DRV2667 Driver Increment Mode
Decrement Mode Piezo Actuator
Effect Buttons
Press to play haptic effects.
Programmer
Connector
Actuator Disconnect
Pins
Analog In
Getting Started www.ti.com
1 Getting Started
The DRV2667EVM-CT can be used as a demonstration and evaluation tool. The DRV2667EVM-CT
comes pre-programmed with a basic demonstration program that includes sample haptic waveforms to
use with the on-board actuator.
To begin, power the board by connecting the DRV2667EVM-CT to an available USB port using the
included mini-USB cable. The board begins with a power-up sequence, and finishes by entering Demo
mode. In Demo mode, the four larger buttons (B1–B4) are used to sample haptic effects with the on-board
Piezo in the top-right corner. The two smaller mode buttons (–,+) are used to change between the
different modes or sets of effects. See DRV2667 Demonstration Program for a more detailed description.
Figure 1. Board Diagram
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1.1 Evaluation Module Operating Parameters
Table 1 lists the operating conditions of the DRV2667. More detailed information can be found in the
DRV2667 datasheet on ti.com (http://www.ti.com/product/drv2667).
Table 1. EVM Operating Parameters
Parameter Specification
Supply voltage range 3.0 V to 5.5 V
Power supply current rating 700 mA
1.2 Quick-Start Board Setup
The DRV2667EVM-CT firmware contains sample haptic waveforms which showcase the features and
benefits of the DRV2667. See the instructions below to power the board and begin using Demo mode.
1. Out of the box, the jumpers are set to begin demo mode using USB power. The default jumper settings
are found in Table 2.
Table 2. Default Jumper Settings
Jumper Default Position Description
JP1 Shorted 3.3-V reference for I2C
JP2, JP3 Shorted Connect the on-board actuator to the DRV2667
MSP USB to MSP Selects USB (5 V) for the MSP430 power rail
DRV USB to DRV Selects USB (5 V) for the DRV2667 power rail
2. Connect the mini-USB cable (included) to the USB connector on the DRV2667EVM-CT board.
3. Connect the other end of the USB cable to an available USB port on a computer, USB charger, or USB
battery pack.
4. If the board is powered correctly, the four colored LEDs will light, the four mode LEDs will flash, and
the Piezo will buzz, indicating the board has been successfully initialized.
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Demo Mode RAM Library
Mode
Design & Test
Mode
+ +
Hold for 3s Hold for 3s
Modes
Mode OFF
Mode 4
Mode 3
.
.
Mode 0
Modes*
Mode 0
Mode 1
Mode 2
.
.
Mode 5 (Empty)
.
.
Mode 30 (Empty)
Mode 31 (Empty)
Modes*
Mode 0
Mode 1
Mode 2
.
.
Mode 8
Mode 9 (Empty)
.
Mode 29 (Empty)
Mode 30
Mode 31
+
++
* Displayed in Binary
DRV2667 Embedded Software www.ti.com
2 DRV2667 Embedded Software
The DRV2667EVM-CT contains a microcontroller with embedded software to operate and control the
board. The software consists of multiple sets of modes and effects that showcase the features of the
DRV2667 driver. There are three sets of modes that are accessed by pressing and holding the "+" button.
The diagram below shows how to access the different sets.
Figure 2. DRV2667EVM-CT Mode Sets
Set Descriptions:
1. Demo Mode – contains a set of pre-designed effects that use the features of the DRV2667. This mode
is great for demonstrating the DRV2667.
2. RAM Library Mode – a library created and stored in the RAM of the DRV2667. Library mode
implements a RAM-based library of effects that are triggered by the MSP430 microcontroller.
3. Design & Test Mode – a set of modes used to build waveforms, perform life tests, and control the
DRV2667 externally.
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2.1 Demo Mode
The demo effects are listed in Table 3. The modes are selected using the "–" and "+" mode buttons in the
center of the board. The current mode is indicated by the white LEDs directly above the mode buttons.
Buttons B1–B4 trigger the effects listed in the description column and change based on the current mode.
Table 3. DRV2667EVM-CT Demo Mode
Mode Button Description Notes
Mode Off B1 Alert 1 Mode 3 – Waveform generation
LEDs Off B2 Alert 2
B3 Alert 3
B4 Alert 4
Mode 4 B1 Short click Mode 3 – Waveform generation
LED M4 On B2 Click and release 1
B3 Click and release 2
B4 Ramp and release
Mode 3 B1 Ramp up (200 Hz) Mode 3 – Waveform generation
LED M3 On B2 Bounce (250 Hz)
B3 Click bounce
B4 Pulse (hold to repeat)
Mode 2 B1 Sharp click Mode 1 – FIFO
LED M2 On B2 Bump
B3 Alert
B4 Robotic (two-tone) click Mode 2 – RAM mode
Mode 1 B1 Concentration/Simon game Mode 3 – Waveform generation
LED M1 On B2
B3
B4
Mode 0 B1 28.8 dB, 50 Vpp, Boost = 30 V Analog Input – Press a button to set the gain, voltage and enable the part for
LED M0 On analog input. Disable by changing modes.
B2 34.8 dB, 100 Vpp, Boost = 55 V
B3 38.4 dB, 150 Vpp, Boost = 80 V
B4 40.7 dB, 200 Vpp, Boost = 105 V
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2.2 Demo Mode Descriptions
The modes and effects in Table 3 are described in the following sections. Use this as a starting point for
creating your own waveforms.
2.2.1 Mode Off – Alert Effects
The effects in Mode Off are basic alert effects that use the DRV2667 waveform generator. The waveform
generator reduces the demand of the host processor by creating the output waveform based on five
parameters set in the DRV2667 register map. This eliminates the need for the host processor to output
waveform samples continuously. The only thing the host processor must do is “trigger” the waveform.
For effects that repeat continuously, simply program the DRV2667 to repeat the waveform and then
“trigger” the waveform; once triggered, the waveform will repeat continuously until stopped.
The following waveforms are generated when buttons B1–B4 are pressed.
Button B1 – Alert 1
Alert 1 is a single waveform that produces a bump or buzz feel.
Figure 3. B1 – Alert 1 Figure 4. B1 – Alert 1 Continuous Repeat
Button B2 – Alert 2
Alert 2 is a sequence of two waveforms that produces a buzz and click waveform.
Figure 5. B2 – Alert 2 Figure 6. B2 - Alert 2 Continuous Repeat
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Button B3 – Alert 3
Alert 3 is a sequence of five waveforms that produces a gallop like feel.
Figure 7. B3 – Alert 3 Figure 8. B3 – Alert 3 Continuous Repeat
Button B4 – Alert 4
Alert 4 is a single waveform that produces a buzz.
Figure 9. B4 – Alert 4 Figure 10. B4 – Alert 4 Continuous Repeat
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2.2.2 Mode 4 – Click and Release Effects
The effects in Mode 4 are clicks and click and release effects. A click and release effect produces a click
feel when the button is pressed and another click when the button is released.
Button B2 – Click and Release
The click and release effect on button B2 is shown in the two images below. In Figure 11, the release is
nearby the press click, because the button was pressed and released quickly. In Figure 12, the release is
further from the press click, because the button was released slower.
Figure 11. B2 – Click and Release 1 Figure 12. B2 – Click and Release 2
Button 4 – Ramp and Release
The effect on button four is a ramp and release effect. When the button is pressed the waveform ramps up
and when released it ramps down.
Figure 13. Ramp and Release
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2.2.3 Mode 3 – Gaming Effects
The effects in mode 3 are unique effects that can be used for gaming.
Button 1 – Ramp Up
Button 1 is a ramp up waveform which can be easily programmed using the waveform generator.
Figure 14. B1 – Ramp Up
Button 2 – Click Bounce
Button 2 consists of two waveforms, a click, and then a ramp down. This produces a click bounce feel.
Figure 15. B3 – Click Bounce
Button 4 – Pulse
Button 4 consists of two waveforms a ramp up and ramp down. This produces a pulsating effect.
Figure 16. B4 – Pulse
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2.2.4 Mode 2 – FIFO and RAM Effects
The effects in Mode 2 are very similar to the previous modes; however, they do not use the DRV2667
waveform generator. Instead they use either the FIFO streaming mode or the internal RAM. The
advantage of using FIFO or RAM is that the waveforms can be completely arbitrary.
In Figure 17 and Figure 18, the click and bump were created using FIFO mode.
Figure 17. B1 – Sharp Click Using FIFO Figure 18. B2 – Bump using FIFO
If you choose to use the embedded RAM you can create waveforms like the two-tone robotic click
waveform in Figure 19.
Figure 19. B4 – Robotic Click using RAM
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2.2.5 Mode 1 – Concentration Game
Mode 1 is a game that incorporates the various Piezo effects. This can be used to demonstrate haptics in
a real application.
To begin playing Concentration:
1. Press any of the large effect buttons.
2. The game will then count down.
3. Once the countdown completes, a button will turn on and an effect will play.
4. Repeat the pattern by pressing the same button.
5. After each successfully repeated pattern, the board will repeat the same pattern and add one
additional button to the sequence.
2.2.6 Mode 0 – Analog or Audio Input
Mode 0 allows you to connect an analog input source to the DRV2667EVM-CT. See Analog/PWM Input
for the hardware configuration.
This shows the advantage of Piezo over other actuator technologies. Piezo actuators have a much faster
response time than ERM and LRA actuators, so the Piezo actuator can be driven with an analog or audio
signal and reproduce the input frequencies well.
Figure 20 is an illustration of an audio signal producing vibration on the Piezo actuator.
Figure 20. B3 – Audio In
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2.3 RAM Library Mode
The second set of modes is called Library Mode, which implements a haptic effect library using the
DRV2667 RAM. The effects in RAM are accessed in sequential order using the capacitive touch buttons.
For example, with all Mode LEDs off, B1 is waveform 1, B2 is waveform 2, and so on. Then when Mode
LED M0 is on, B1 is waveform 5, B2 is waveform 6, and so on. Enter Library Mode and access the
DRV2667 RAM Library using the following steps:
1. Press and hold the increment mode button ("+") for approximately 3 seconds until the mode LEDs flash
and the colored LEDs flash once.
2. Now use the "+" and "–" buttons to select the mode and press buttons B1–B4 to play an effect.
The equations for calculating the Mode and Button of an effect are:
Mode = RoundDown( [Effect No.] / 4 ) (1)
Button = ([Effect No.] – 1) % 4 + 1 (2)
% – modulo operator
See Table 4 for a list effects stored in the DRV2667 RAM.
2.4 RAM Library Effects List
Table 4 is a description of the effects stored in the DRV2667 RAM.
Table 4. DRV2667EVM-CT Library Modes
Effect ID Waveform Name
1 Click150
2 Click200
3 Click250
4 Click300
5 Bounce100
6 Bounce150
7 Bounce200
8 Bounce250
9 Transition100
10 Transition150
11 Transition200
12 Transistion250
13 Click + Bounce
14 Transition + Click
15 Flyby
16 Long Click + Bounce
17 Alert 1
18 Alert 2
19 Alert 3
20 Alert 4
2.5 Design & Test Mode
Design & Test contains modes that are used to design, test, and characterize the DRV2667. To access
Design & Test modes use the following instructions:
1. Press and hold the increment mode button ("+") for approximately 3 seconds until the mode LEDs flash
and the colored LEDs flash once.
2. Press and hold the increment mode button ("+") one more time until the mode LEDs flash and the
colored LEDs flash twice.
3. Select from the Design & Test modes using the "+" and "–" buttons.
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Table 5 lists the modes available for design and testing.
Table 5. DRV2667EVM-CT Binary Modes
Mode Button Description Notes
Mode 0 B1 Memory store enabled GUI Mode – use this mode to trigger and store the sequencer set by a GUI. Store the
GUI Mode sequencer by first pressing B1 (the mode LEDs turn on). Then press either B2 or B3,
B2 Store/Play memory 1
LEDs: 00000 storing the sequencer values. Press B1 again to exit memory storage. B4 triggers the
active sequencer.
B3 Store/Play memory 2
B4 Trigger active sequencer
Mode 1 B1 Disable Effect Building
Dynamic white
B2 Play effect once
Waveform Modes 1–6 can be used to create a unique effect by adjusting the frequency,
Playback amplitude, duration, and envelope of a single waveform. Button B1 in each mode is a
B3 Infinite playback
LEDs: 00001 continuous buzz with the frequency set in mode 2 and the amplitude set in mode 3.
B4 Infinite playback with 1-s wait Button 2 in each mode is the effect created using the frequency, amplitude, duration,
and envelope set by the respective modes. It is recommended to use an oscilloscope
Mode 2 B1 Continuous buzz to measure the output when creating effects.
Frequency B2 Dynamic effect white
Adjust white
LEDs: 00010 B3 Decrease frequency white
B4 Increase frequency Create a Waveform
white
Mode 3 B1 Continuous buzz 1) Select the frequency using B3 and B4 in Mode 2
Amplitude B2 Dynamic effect 2) Select the amplitude using B3 and B4 in Mode 3
Adjust 3) Select the duration using B3 and B4 in Mode 4
LEDs: 00011 B3 Decrease amplitude 4) Select the ramp up time using B3 and B4 in Mode 5 (Default is 0)
B4 Increase amplitude 5) Select the ramp down time using B3 and B4 in Mode 6 (Default is 0)
white
Mode 4 B1 Continuous buzz white
Duration Adjust B2 Dynamic effect white
LEDs: 00100 Waveform Playback (Mode 1)*
B3 Decrease duration white
B4 Increase duration Use Mode 1 to playback the waveform created above.
B2 – Play the effect once
Mode 5 B1 Continuous buzz B3 – Continuously repeat the effect
Ramp Up Adjust B2 Dynamic effect B4 – Continuously repeat the effect with a 1-s pause in between
LEDs: 00101 * Mode 1 is used for conducting a life test
B3 Decrease ramp up
B4 Increase ramp up
Mode 6 B1 Continuous buzz
Ramp Down B2 Dynamic Effect
Adjust
LEDs: 00110 B3 Decrease Ramp Down
B4 Increase Ramp Down
Mode 7 B1 28.8 dB, 50 Vpp, Boost = 30 V Analog Input – Press a button to set the gain, voltage, and enable the part for analog
Analog Input input. Disable by changing modes.
B2 34.8 dB, 100 Vpp, Boost = 55
LEDs: 00111 V
B3 38.4 dB, 150 Vpp, Boost = 80
V
B4 40.7 dB, 200 Vpp, Boost = 105
V
Mode 8 B1 Begin recording Recorder – use this mode to create a single amplitude pattern. Start by pressing the
Recorder record button (B1), then use B2 to create the pattern by tapping the button. When
B2 Create pattern
LEDs: 01000 finished, press the playback button (B3).
B3 Playback
B4
Mode 30 B1 28.8 dB, 50 Vpp, Boost = 30 V Default Gain & Boost Voltage – Use this mode to set the default gain and boost
Default Gain & voltage used by the other modes. Select a gain and boost voltage setting by pressing
B2 34.8 dB, 100 Vpp, Boost = 55
Boost Voltage buttons B1–B4. The setting is saved until changed or the board is powered down.
V
LEDs: 11110 B3 38.4 dB, 150 Vpp, Boost = 80
V
B4 40.7 dB, 200 Vpp, Boost = 105
V
Mode 31 B1 Device ID About the Board – the value appears on the mode LEDs in binary.
About the Board B2 Silicon revision
LEDs: 11111 B3 Code revision
B4
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2.6 Return to Demo Mode
To exit Library Mode or Design & Test Mode and return to Demo Mode:
1. Press and hold the decrement mode button ("–") for approximately 3 seconds.
2. Release the button when the actuator buzzes and the mode LEDs flash.
3. Select from the Demo modes using the "+" and "–" buttons.
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USB
VBAT
MSP
DRV
USB
VBAT
USB
VBAT
www.ti.com Hardware Configuration
3 Hardware Configuration
The DRV2667EVM-CT is very flexible and can be used to completely evaluate the DRV2667. The
following sections list the various hardware configuration options.
3.1 Input and Output Overview
The DRV2667EVM-CT allows for complete evaluation of the DRV2667 through the use of test points,
jacks, and connectors. Table 6 gives a brief description of the hardware.
Table 6. Hardware Overview
Signal Description I/O
Analog Optional analog input to DRV2667 IN+/IN– Input
Pins
I2C MSP430 and DRV2667 I2C Bus Input/Output
OUT+/OUT– Output test points for test and Output
measurement
OUT Output terminal block to connect actuator Output
SBW MSP430 programming header Input/Output
USB USB power (5 V) Power
VBAT External Supply Power (3.0 V–5.0 V) Power
3.2 Power Supply
The DRV2667EVM-CT can be powered by USB or an external power supply (VBAT). Jumpers DRV and
MSP are used to select the supply for the DRV2667 and the MSP430G2553, respectively. See the
Table 7 for configuration options.
Figure 21. DRV2667EVM-CT Power Diagram
Table 7. Power Supply Configuration Options (1)
Supply Configuration DRV MSP DRV2667 Supply Voltage
USB – Both USB USB 5 V
DRV2667 External Supply, VBAT USB VBAT (3.0–5.5 V)
MSP430 USB
External Supply – Both VBAT VBAT VBAT (3.0–5.5 V)
(1) The DRV2667 should be enabled before enabling the MSP430. I2C transactions do not work when the DRV2667 is powered
down.
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VDD
DRV2667
IN+ GND
OUT+
OUT-
MSP430
PWM
SDA
SCL SDA
SCL
C6
Analog R6, 0Q
R7, NP
SDA SCL
IN-
C7
From DRV2667
OUT
OUT OUT+
Hardware Configuration www.ti.com
3.3 External Actuator
Figure 22. Output Terminal Block and Test Points
The DRV2667EVM-CT can be used with an external actuator. Follow the instructions below to attach an
actuator to the OUT terminal block.
1. Ensure the board is powered down.
2. Remove jumpers JP2 and JP3, which disconnects the on-board actuator.
3. Attach the positive and negative leads of the actuator to the green OUT terminal block.
4. Screw down the terminal block to secure the actuator leads.
WARNING
Before connecting a load, ensure that the Piezo actuator (or other
load) is rated for 150 Vpp. If not, see Programming the Boost
Converter to adjust the DRV2667 maximum output voltage.
3.4 External I2C Input
Figure 23 is an illustration of the external I2C input.
Figure 23. External I2C Input
The DRV2667 can be controlled by an external I2C source. To control externally, attach the external
controller to the I2C header at the top of the board; be sure to connect SDA, SCL, and GND from the
external source. If the DRV2667EVM-CT is powered, the DRV2667 will be ready to accept I2C
transactions.
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VDD
DRV2667
IN+ GND
OUT+
OUT-
MSP430
PWM
SDA
SCL SDA
SCL
C6
Analog R6, 0Q
R7, NP
SDA SCL
IN-
C7
www.ti.com Hardware Configuration
There is also a special mode in the Design & Test set that allows you to save the DRV2667’s sequencer
registers settings for playback at a later time. To store the sequencer:
1. Enter Design & Test Modes. Select Mode 0 – GUI Mode (00000’b) using the increment mode button
(“+”).
2. Press the B1 button to enter storage mode. (The mode LEDs will all turn on.)
3. Press the B2 or B3 button to save the current sequencer to the respective button.
4. Press the B1 button again to exit storage mode. (The mode LEDs will all turn off.)
5. Press either the B2 or B3 button to reload the DRV2667 sequencer with the saved sequence and play.
3.5 Analog/PWM Input
Figure 24 is an illustration of the external analog and PWM input.
Figure 24. External Analog/PWM Input
The DRV2667EVM-CT accepts analog or PWM inputs for the analog IN+/IN- pins of the DRV2667. To use
the IN+/IN- pins of the DRV2667 follow the instructions below:
1. Enter Design & Test Modes. Select Mode 7 (00111’b) using the increment mode button (“+”).
2. Select the gain and voltage using buttons B1–B4:
• B1 – 28.8 dB, 50 Vpp
• B2 – 34.8 dB, 100 Vpp
• B3 – 38.4 dB, 150 Vpp
• B4 – 40.7 dB, 200 Vpp
3. Turn on the signal source to begin output.
3.6 Programming the Boost Converter
The integrated boost converter provides the necessary voltage to drive 200 Vpp. The boost converter is
applied differentially across the load to achieve output voltage of two times the boost voltage. The
DRV2667 maximum output voltage should be adjusted so that it does not exceed the maximum rated
voltage of the load. This not only prevents damage to the load, but also helps improve efficiency. To
adjust the output voltage, adjust the boost converter voltage and DRV2667 internal gain settings using the
instructions in Section 3.6.1 to Section 3.6.2.
19
SLOU323–June 2013 DRV2667 Evaluation Module
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FB
DRV2667
VBST
R1
R2 R4 R3
Q1
GAIN1 GAIN0
Hardware Configuration www.ti.com
3.6.1 Adjusting the Boost Voltage Using Software
The boost output voltage (VBST) is programmed by two external feedback resistors R1 and R2, as shown
in the Figure 25. The DR2667EVM-CT includes two additional resistors, R3 and R4, which allow the
MSP430 to programmatically adjust VBST using a combination of the four resistors to produce four
different voltage levels. Refer to Table 8 for VBST at each gain setting and the equivalent low-side
resistance.
Figure 25. Boost Voltage Programming Resistors
NOTE: Remove R3 and R4 if adjusting VBST using resistors R1 and R2.
Table 8. Boost Voltage using MSP430 GPIO Control
GAIN1 GAIN0 VFB Low-Side Resistance VBST
0 0 35.7 kΩ30
0 1 19.1 kΩ54
1 0 12.8 kΩ80
1 1 9.8 kΩ105
To change the default boost voltage on the DRV2667EVM-CT using the embedded software, follow the
instructions below:
1. Enter Design & Test Modes.
2. Select Mode 30 (11110’b) using the increment mode button (“+”).
3. Select the gain and voltage using buttons B1–B4:
• B1 – 28.8 dB, 50 Vpp
• B2 – 34.8 dB, 100 Vpp
• B3 – 38.4 dB, 150 Vpp
• B4 – 40.7 dB, 200 Vpp
4. Exit Mode 30 and use the board as normal.
NOTE: the DRV2667EVM-CT will revert to the original voltage setting (150 Vpp) on power down.
3.6.2 Adjusting the Boost Voltage Using Hardware
The boost voltage is adjustable using the two GPIOs; GAIN1 and GAIN0, in code. In most applications,
however, the boost voltage is fixed so R3 and R4 are not necessary and the boost voltage can simply be
set by R1 and R2. To replace R1 and R2, first remove R3 and R4 and use Equation 3 to calculate the
boost output voltage.
20 DRV2667 Evaluation Module SLOU323–June 2013
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