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Texas Instruments DRV2604L ERM, LRA Haptic Driver Evaluation Kit (Rev. A) User guides
User's Guide
SLOU390A – May 2014 – Revised June 2014
DRV2604L ERM, LRA Haptic Driver Evaluation Kit
The DRV2604L is a haptic driver designed for Linear Resonant Actuators (LRA) and Eccentric Rotating
Mass (ERM) motors. It provides many features which help eliminate the design complexities of haptic
motor control including reduced solution size, high efficiency output drive, closed-loop motor control, quick
device startup, memory for waveform storage, and auto-resonance frequency tracking.
The DRV2604LEVM-CT Evaluation Module (EVM) is a complete demo and evaluation platform for the
DRV2604L. The kit includes a microcontroller, linear actuator, eccentric rotating mass motor, and
capacitive touch buttons which can be used to completely demonstrate and evaluate the DRV2604L.
This document contains instructions to setup and operate the DRV2604LEVM-CT in demo and evaluation
mode.
Figure 1. DRV2604LEVM-CT Board
Evaluation Kit Contents:
• DRV2604LEVM-CT demo and evaluation board
• Mini-USB cable
• Demonstration Firmware
Required 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
• DRV2604LEVM-CT firmware available on ti.com
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Contents
Getting Started ............................................................................................................... 4
1.1
Evaluation Module Operating Parameters ...................................................................... 5
1.2
Quick Start Board Setup ........................................................................................... 5
DRV2604L Demonstration Program....................................................................................... 5
2.1
Modes and Effects Table .......................................................................................... 6
2.2
Description of the Demo Modes .................................................................................. 7
2.3
RAM Library Mode ................................................................................................ 11
2.4
Waveform Library Effects List ................................................................................... 11
Additional Hardware Modes............................................................................................... 12
3.1
Enter Binary Counting Mode ..................................................................................... 12
3.2
Exit Binary Counting Mode ....................................................................................... 12
3.3
Binary Counting Modes ........................................................................................... 13
Hardware Configuration ................................................................................................... 14
4.1
Input and Output Overview ...................................................................................... 14
4.2
Power Supply Selection .......................................................................................... 15
4.3
Using an External Actuator....................................................................................... 15
4.4
PWM Input ......................................................................................................... 16
4.5
External Trigger Control ......................................................................................... 17
4.6
External I2C Input .................................................................................................. 18
4.7
Analog Input........................................................................................................ 19
Measurement and Analysis .............................................................................................. 19
Modifying or Reprogramming the Firmware ............................................................................ 21
6.1
MSP430 Pin-Out .................................................................................................. 22
Schematic ................................................................................................................... 23
Layout ........................................................................................................................ 24
Bill of Materials ............................................................................................................. 27
1
DRV2604LEVM-CT Board .................................................................................................. 1
2
Board Diagram ............................................................................................................... 4
3
DRV2604LEVM-CT Mode Sets ............................................................................................ 5
4
ERM Click and Bounce Waveform (Button 1)............................................................................ 7
5
LRA Ramp-Up and Click Waveform (Button 2) .......................................................................... 7
6
ERM Closed-Loop Click Waveform (Button 1) ........................................................................... 7
7
ERM Open-Loop Click Waveform (Button 4)
8
LRA Single-Cycle Click (Button 2) ......................................................................................... 8
9
LRA Single-Cycle with Braking (Button 3) ................................................................................ 8
10
LRA Closed-Loop Click Waveform (Button 1)
11
LRA Open-Loop Click Waveform (Button 4) ............................................................................. 8
12
LRA Auto-Resonance ON Waveform (Button 1)
13
LRA Auto-Resonance OFF Waveform (Button 2) ....................................................................... 9
14
Acceleration Versus Frequency ............................................................................................ 9
15
LRA Scroll Wheel Effect Waveform (Button 4) ......................................................................... 10
16
LRA Click with Braking in Open Loop (Button 3)
1
2
3
4
5
6
List of Figures
17
18
19
20
21
22
23
2
............................................................................
...........................................................................
........................................................................
......................................................................
LRA Click with Braking in Auto Resonance (Button 1) ................................................................
Power Jumper Selection ..................................................................................................
Terminal Block and Test Points ..........................................................................................
External PWM Input ........................................................................................................
External Trigger Control ...................................................................................................
External I2C Input ...........................................................................................................
Analog Input.................................................................................................................
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Terminal Block and Test Points .......................................................................................... 19
25
DRV2604L Unfiltered Waveform ......................................................................................... 20
26
DRV2604L Filtered Waveform ............................................................................................ 20
27
Measuring the DRV2604L Output Signal with an Analog Low-Pass Filter
28
29
30
31
32
33
34
.........................................
LaunchPad Programmer Connection ....................................................................................
DRV2604LEVM-CT Schematic ...........................................................................................
X-Ray Top View ............................................................................................................
Top Copper .................................................................................................................
Layer 2 Copper .............................................................................................................
Layer 3 Copper .............................................................................................................
Bottom Copper..............................................................................................................
20
21
23
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List of Tables
1
Mode and Effects Table ..................................................................................................... 6
2
Waveform Effects
3
Binary Counting Modes .................................................................................................... 13
4
Hardware Overview ........................................................................................................ 14
5
MSP430 Pin-Out
6
..........................................................................................................
...........................................................................................................
Bill of Materials .............................................................................................................
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3
Getting Started
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Getting Started
The DRV2604L can be used as a demonstration or evaluation tool. When the DRV2604LEVM-CT
evaluation module is powered on for the first time, a demo application automatically starts. To power the
board, connect the DRV2604LEVM-CT to an available USB port on your computer using the included
mini-USB cable. The demo begins with a board power-up sequence and then enters the demo effects
mode. The four larger buttons (B1–B4) can be used to sample haptic effects using both the ERM and LRA
motor in the top right corner. The two smaller mode buttons (–, +) are used to change between the
different banks of effects. See the DRV2604L Demonstration Program section for a more detailed
description of the demo application.
USB Power
DRV2604L
Decrement Mode
Power Select Pins
USB
External
Power
Increment Mode
Actuator Disconnect
ERM and LRA Actuators
OUT
MSP
JP4
VBAT
DRV
MSP430
JP3
AUDIO
DRV2604L
Actuators
Analog-In
SBW
Programmer
Connector
Effect Buttons
Press to play haptic effects.
Figure 2. Board Diagram
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1.1
Evaluation Module Operating Parameters
The following table lists the operating conditions for the DRV2604L on the evaluation module.
1.2
Parameter
Specification
Supply voltage range
2.5 V to 5. 5 V
Power-supply current rating
400 mA
Quick Start Board Setup
The DRV2604LEVM-CT firmware contains haptic waveforms which showcase the features and benefits of
the DRV2604L. Follow the instructions below to begin the demo:
1. Out of the box, the jumpers are set to begin demo mode using USB power. The default jumper settings
are found in the table below.
Jumper
Default Position
Description
JP1
Shorted
Connect MSP430 GPIO/PWM output to DRV2604L IN/TRIG
JP2
Shorted
3.3 V reference for I2C
JP3, JP4
Shorted
Connect on-board actuators to DRV2604L
MSP
USB to MSP
Select USB (5 V) or VBAT power for the MSP430
DRV
USB to DRV
Select USB (5 V) or VBAT power for the DRV2604L
2. Connect the included mini-USB cable to the USB connector on the DRV2604LEVM-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 turn on, the four mode LEDs will flash, and
the LRA and ERM will perform auto-calibration, indicating the board has been successfully initialized.
2
DRV2604L Demonstration Program
The DRV2604LEVM-CT contains a microcontroller and embedded software to control the DRV2604L.
There are three sets of modes accessible by pressing and holding the “+” button. Follow the instructions in
the following sections to access the effects in each set.
Hold for 3s
+
Demo Mode
Modes
Mode OFF
Mode 4
Mode 3
+ .
.
Mode 0
* Displayed in Binary
Hold for 3s
+
ROM Library
Mode
Modes*
Mode 0
Mode 1
Mode 2
.
.
+ Mode 5
.
.
Mode 30
Mode 31 (Library Select)
Binary Counting
Mode
Modes*
Mode 0
Mode 1
Mode 2
.
.
+ Mode 9
Mode 10 (Empty)
.
Mode 29 (Empty)
Mode 30
Mode 31
Figure 3. DRV2604LEVM-CT Mode Sets
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Modes and Effects Table
The effects preloaded on the DRV2604LEVM-CT are listed in Table 1. The modes are selected using the
+ and – mode buttons in the center of the board. The current mode is identified 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 selected mode.
Table 1. Mode and Effects Table
Mode
Button
Description
Actuator
Waveform
Location
Interface
Mode Off
LEDs Off
B1
Click + Bounce
ERM
RAM
Internal Trigger (I2C)
B2
Ramp Up + Click
LRA
B3
Gallop Alert
ERM
B4
Pulsing Alert
LRA
B1
Strong Click
ERM
RAM
Ext. Level Trig.
B2
Bump + Release
Internal Trigger
B3
Double Strong Click
Ext. Edge Trig.
B4
Click (Open Loop)
B1
Strong Click
B2
Single-Cycle Click
B3
Single-Cycle Click with braking
B4
Click (Open Loop)
B1
Buzz Auto-Resonance ON
B2
Buzz Auto-Resonance OFF
B3
Buzz Alert
ERM
B4
Scroll Wheel
LRA
B1
Click with braking
ERM and LRA
RAM
Internal Trigger (I2C)
B2
Click without braking
B3
Click with braking (Open Loop)
B4
Selects ERM or LRA
B1
Auto-Calibration
ERM
Internal Routine
Internal Trigger (I2C)
B2
Auto-Calibration
LRA
B3
Click
ERM/LRA
B4
Buzz
Mode 4
LED M4 On
Mode 3
LED M3 On
Mode 2
LED M2 On
Mode 1
LED M1 On
Mode 0
LED M0 On
6
LRA
µController
PWM
RAM
Ext. Level Trig.
Internal Trigger
Internal Trigger
LRA
µController
PWM
µController
RTP (I2C)
PWM
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RTP (I2C)
RAM
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2.2
Description of the Demo Modes
The following sections describe each demo mode in more detail.
2.2.1
Mode Off – Haptics Effect Sequences
Mode Off is a set of haptic sequences that combine a series of haptic effects. The two effects below show
combinations of clicks and ramps.
Figure 4. ERM Click and Bounce
Waveform (Button 1)
2.2.2
Figure 5. LRA Ramp-Up and Click
Waveform (Button 2)
Mode 4 – ERM Clicks
Mode 4 shows the difference in open-loop and closed-loop ERM clicks. In closed loop, the driver
automatically overdrives and brakes the actuator. In open-loop, the waveform must be predefined with
overdrive and braking. The image on the left shows a closed-loop waveform and the image on the right
shows the same input waveform without closed-loop feedback enabled.
Figure 6. ERM Closed-Loop Click Waveform (Button 1)
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Figure 7. ERM Open-Loop Click Waveform (Button 4)
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Mode 3 – LRA Clicks
Mode 3 shows what the waveforms look like with and without braking and how closed-loop and open-loop
mode affects the acceleration profile. Figure 8 and Figure 9 demonstrate single-cycle clicks. In closed
loop, the driver automatically tracks the resonant frequency, and overdrives and brakes the actuator. In
open-loop, the waveform must be predefined with a static drive frequency, and overdrive and braking
times. Figure 10 shows a closed-loop waveform (with overdrive and braking) while Figure 11 shows openloop mode that does not have overdrive or braking. Overdrive and braking allows the waveform to feel
more crisp.
8
Figure 8. LRA Single-Cycle Click (Button 2)
Figure 9. LRA Single-Cycle with Braking (Button 3)
Figure 10. LRA Closed-Loop Click Waveform (Button 1)
Figure 11. LRA Open-Loop Click Waveform (Button 4)
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2.2.4
Mode 2 – Alerts and Scroll Wheel
Mode 2 showcases the advantages of the Smart Loop Architecture which includes auto-resonance
tracking, automatic overdrive, and automatic braking.
The two images below show the difference in acceleration between LRA auto-resonance ON and LRA
auto-resonance OFF. Notice that the acceleration is higher when driven at the resonant frequency. The
auto-resonance ON waveform has 1.32 G of acceleration and the auto-resonance OFF waveform has
0.92 G of acceleration. The auto-resonance ON waveform has 43% more acceleration.
Figure 12. LRA Auto-Resonance ON
Waveform (Button 1)
Figure 13. LRA Auto-Resonance OFF
Waveform (Button 2)
The reason for higher acceleration can be seen in the acceleration versus frequency graph below. The
LRA has a very narrow operating frequency range due to the properties of a spring-mass system.
Furthermore, the resonance frequency drifts over various conditions such as temperature and drive
voltage. With the Smart Loop auto-resonance feature, the DRV2604L dynamically tracks the exact
resonant frequency to maximize the vibration force.
Figure 14. Acceleration Versus Frequency
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Button 4 uses a series of clicks to create a scroll wheel effect. See the oscilloscope capture in Figure 15.
Figure 15. LRA Scroll Wheel Effect Waveform (Button 4)
2.2.5
Mode 1 – Click Waveforms
Mode 1 shows the advantages and disadvantages of the click waveform in the different modes of
operation. Button 1 plays the click waveform with braking in auto-resonance. Button 2 plays the click
waveform with no braking in auto-resonance. It is apparent that braking allows the waveform to dampen
faster so there is no excessive oscillations at the end of the waveform. Button 3 plays the click with
braking but in open loop. Braking is not supported in open loop, thus there is no reverse operation of the
actuator shown in the graph.
Figure 16. LRA Click with Braking in Open Loop
(Button 3)
2.2.6
Figure 17. LRA Click with Braking in Auto Resonance
(Button 1)
Mode 0 – Auto-Calibration
Auto-calibration is a DRV2604L-embedded routine that detects the characteristics and behavior of an
actuator and adjusts the drive waveform automatically.
Perform auto-calibration using the following steps:
1. Connect an actuator to the green output terminal (OUT) or use the on-board actuators
2. For an ERM actuator, run the ERM auto-calibration by pressing button B1
3. For an LRA actuator, run the LRA auto-calibration by pressing button B2
10
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4. Read the auto-calibration register values using I2C
5. Test using buttons B3 and B4
2.3
RAM Library Mode
Access the RAM library effects by holding the + button until the mode LEDs flash and the colored LEDs
flash ONCE.
Once in Library Mode the DRV2604L loaded RAM effects can be accessed in sequential order. 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.
The equations for calculating the Mode and Button of an effect are:
Mode = RoundDown( [Effect No.] / 4 )
Button = ([Effect No.] – 1) % 4 + 1
% - modulo operator
To change between ERM and LRA:
1. Select mode 31 (11111'b) using the + or – buttons.
• B1 – Press to select ERM
• B2 – Press to select LRA
2. Then use the RAM effects as described above.
2.4
Waveform Library Effects List
Table 2 lists the descriptions of the waveforms embedded in the DRV2604L.
Table 2. Waveform Effects
Effect ID Waveform Name
1
Strong Click
2
Medium Click
3
Light Click
4
Tick
5
Bump
6
Strong Double Click
7
Medium Double Click
8
Light Double Click
9
Strong Triple Click
10
Buzz
11
Ramp Up
12
Ramp Down
13
Gallop Alert
14
Pulsing Alert
15
Test Click with Braking
16
Test Buzz with Braking
17
Life Test Buzz with Braking
18
Life Test Continuous Buzz
19
ERM OL 1 ms Interval Click
20
LRA OL 1 ms Interval Click
21
ERM/LRA Click for 5 ms playback interval
22
ERM/LRA Click for 1 ms playback interval
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Additional Hardware Modes
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Additional Hardware Modes
Additional modes are available on the DRV2604LEVM-CT providing increased board control and
functionality. The additional modes are not available in demo mode, but can be accessed by switching to
binary counting mode. In binary counting mode the mode LEDs count in binary (32 modes) rather than in
demo mode format (only 6 modes including off).
3.1
Enter Binary Counting Mode
To enter binary counting mode and access the additional modes:
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 binary counting mode using the + and – buttons.
3.2
Exit Binary Counting Mode
To
1.
2.
3.
12
exit binary counting mode and return to demo mode:
Press and hold the decrement mode button (–) for approximately 3 seconds.
Release the button when the actuator buzzes and mode LEDs flash.
Select from the demo modes using the + and – buttons.
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3.3
Binary Counting Modes
Table 3 lists the modes available in binary counting mode.
Table 3. Binary Counting Modes
Mode
Button
Description
Notes
Mode 0
External I2C Mode
LEDs: 00000
B1
Set ERM Output
B2
Set LRA Output
Use this mode to control the DRV2604L using an external I2C Master. Press B1 or B2
to choose between the ERM or LRA. Press B3 to choose the trigger type. (1 - Internal,
2 - Ext. Edge, 3 - Ext. Level). Press B4 to trigger the waveform sequencer.
B3
Choose Trigger
B4
Trigger Button
B1
ERM Auto-Calibration
B2
LRA Auto-Calibration
B3
ERM Diagnostics
B4
LRA Diagnostics
B1
Disable PWM Mode
B2
Set ERM Output
B3
Set LRA Output
B4
-
B1
Return to normal mode
B2
Set ERM Output
B3
Set LRA Output
B4
-
B1
AC Coupling - ERM
B2
DC Coupling - ERM
B3
AC Coupling - LRA
B4
DC Coupling - LRA
B1
Alert (Auto-resonance On)
B2
Alert (Auto-resonance Off)
B3
Decrease output frequency
B4
Increase output frequency
B1
Begin Life Test
B2
Test Buzz
B3
Decrease output voltage (–1)
B4
Increase output voltage (+1)
B1
Begin Life Test
B2
Test Buzz
B3
Decrease output voltage (–1)
B4
Increase output voltage (+1)
B1
Begin Life Test
B2
Test Buzz
B3
Decrease output voltage (–1)
B4
Increase output voltage (+1)
B1
Start/Stop Recording
B2
Create Pattern
B3
Start/Stop Play Back
B4
-
B1
Life Test Infinite Buzz
B2
Life Test 2 s ON, 1 s OFF
B3
Decrease output voltage (–1)
B4
Increase output voltage (+1)
B1
Infinite Buzz at Frequency
B2
Infinite Buzz at Resonance
B3
Decrease Frequency (–1)
B4
Increase Frequency (+1)
B1
Never Transition to Open Loop
B2
Auto-transition to OL Drive
Mode 1
Auto-Calibration &
Diagnostics
LEDs: 00001
Mode 2
External PWM
LEDs: 00010
Mode 3
External PWM and Enable
LEDs: 00011
Mode 4
Analog Input
LEDs: 00100
Mode 5
Auto-resonance OFF
frequency adjust
LEDs: 00101
Mode 6
Life Test (RTP) 2s ON, 1s
OFF
LEDs: 00110
Mode 7
Life Test (RTP) Infinite Buzz
LEDs: 00111
Mode 8
Life Test (PWM) 2s ON, 1s
OFF
LEDs: 01000
Mode 9
Recorder
LEDs: 01001
Mode 10
Life Test (RAM) Infinite Buzz
LEDs: 01010
Mode 11
Frequency Sweep
LEDs: 01011
Mode 12
2nd Cycle Test
LEDs: 01100
B3
Run the auto-calibration. The new auto-calibration results are used for all board effects.
1 flash = successful, 3 flashes = error.
Run diagnostics. 1 flash = successful, 3 flashes = error. The status register bits [3:0]
are displayed on the mode LEDs [3:0] when complete.
External PWM - disconnect MSP430 PWM using JP1. Connect external PWM signal to
the "PWM" testpoint at the top of the board. Select actuator using buttons B2 and B3.
External PWM and Enable - disconnect MSP430 PWM using JP1. Connect external
PWM signal to the "PWM" testpoint at the top of the board. Connect an external enable
signal to the "EN" testpoint. Select actuator using buttons B2 and B3. Press B1 before
switching modes.
Analog Input - apply an external analog signal for AC coupling on the "Audio" jack.
Apply a DC coupled signal to the "PWM" testpoint.
Vary the auto-resonance OFF (open-loop) output frequency and see the change in
vibration force over frequency. Hold B3 or B4 for quick frequency adjustment. Compare
B2 (auto-resonance off) with B1 (auto-resonance on).
Life Test using RTP (2 seconds on, 1 second off) - life test repeats infinite times and
board must be powered down to stop. Increment / Decrement amplitude using B3 and
B4. Test new amplitude using B2. Choose actuator using buttons B1 and B2 in Mode 0
or Mode 1.
Life Test using RTP (Infinite Buzz) - board must be powered down to stop buzz.
Increment / Decrement amplitude using B3 and B4. Test new amplitude using B2
before beginning life test. Choose actuator using buttons B1 and B2 in Mode 0 or
Mode 1.
Life Test using PWM (2 seconds on, 1 second off) - life test repeats infinite times and
board must be powered down to stop. Increment / Decrement amplitude using B3 and
B4. Test new amplitude using B2. Choose actuator using buttons B1 and B2 in Mode 0
or Mode 1.
Recorder - use this mode to create a single amplitude pattern. Start by pressing the
record button (B1). Then use B2 to create the pattern by tapping the button. When
finished press the play back button (B3).
Life Test (RAM Mode) - Increment / Decrement amplitude using B3 and B4. B1 Start/Stop Infinite Buzz Life Test. B2 - Start/Stop 2s ON, 1s OFF life test. Choose
actuator using buttons B1 and B2 in Mode 0 or Mode 1.
Frequency Sweep (ROM Mode) - Increment/Decrement the frequency using B3 and
B4. B1 - Start/stop infinite buzz at chosen frequency. B2 - Start/Stop infinite buzz using
auto-resonance. Frequency range: (50 Hz - 300 Hz)
2nd Cycle Test - closed-loop drive to a resistive load on the output. B1 plays a buzz
alert with OL drive disabled. B2 plays an infinite buzz with the automatic transition to
open loop drive enabled (when back-EMF not detected). Demonstrates DRV2604L
improved algorithm to sync
B4
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Hardware Configuration
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Table 3. Binary Counting Modes (continued)
Mode
Button
Description
Notes
Mode 13
RAM Playback Interval
LEDs: 01101
B1
5 ms playback interval enabled
B2
1 ms playback interval enabled
Playback Interval - demonstrates the 1 ms or 5 ms playback interval. Affects waveform
by multiplying the time data either by 1 ms or 5 ms. B1 - 5 ms mode enabled, B2 - 1
ms mode enabled, B3 - selects between ERM or LRA
B3
Selects ERM or LRA
B4
Mode 30
Actuator Break-in
LEDs: 11110
B1
Begin Actuator Break-in
Actuator Break-in - used to break in new actuators
B1
Device ID
B2
Silicon Revision
About the Board - the value will appear on the mode LEDs in binary.
DRV2604L Device ID = 00100
B3
Code Revision
B2
B3
B4
Mode 31
About the Board
LEDs: 11111
B4
4
Hardware Configuration
The DRV2604LEVM-CT is very flexible and can be used to completely evaluate the DRV2604L. The
following sections list the various hardware configurations.
4.1
Input and Output Overview
The DRV2604LEVM-CT allows complete evaluation of the DRV2604L though test points, jacks, and
connectors. Table 4 gives a brief description of the hardware.
Table 4. Hardware Overview
Signal
Description
I/O
PWM
External input to DRV2604L IN/TRIG pin
Input/Observe
EN
External DRV2604L enable control
Input/Observe
OUT+/OUT–
Filtered output test points for observation, connect to oscilloscope or
measurement equipment
Output
OUT
Unfiltered output terminal block, connect to actuator
Output
USB
USB power (5 V)
Input
VBAT
External Supply Power (2.5 V–5.5 V)
Input
SBW
MSP430 programming header
Input/Output
I2C
DRV2604L and MSP430 I2C bus
Input/Output
Audio
The audio jack is connected to the IN/TRIG pin of the DRV2604L. When the
DRV2604L is in analog input mode, an analog signal from this jack controls
the amplitude envelope of the output waveform.
Input
Hardware configuration details can be found in the following sections.
14
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4.2
Power Supply Selection
The DRV2604LEVM-CT can be powered by USB or an external power supply (VBAT). Jumpers DRV and
MSP are used to select USB or VBAT for the DRV2604L and MSP430G2553, respectively. See the
following table for possible configurations.
USB
USB
MSP
VBAT
USB
VBAT
DRV
VBAT
Figure 18. Power Jumper Selection
Supply Configuration
DRV
MSP
DRV2604L Supply Voltage (1)
USB – Both
USB
USB
5V
DRV2604L external supply,
MSP430 USB
VBAT
USB
VBAT
External supply – both
VBAT
VBAT
VBAT
USB with 3.3-V LDO (2) – both
USB
USB
3.3 V (R4 = Short, R5 = Open)
(1)
(2)
4.3
The DRV2604L supply must be on before operating the MSP430.
If a 3.3-V DRV2604L supply voltage is preferred while using the USB as the power source, remove R5 and add a 0-Ω resistor
across R4.
Using an External Actuator
OUT-
OUT+
OUT
470pF
100k
100k
470pF
From DRV2604L
Figure 19. Terminal Block and Test Points
The DRV2604LEVM-CT can be used with an external actuator. Follow the instructions below to attach an
actuator to the OUT terminal block.
1. Remove jumpers JP3 and JP4, which disconnects the on-board actuators from the DRV2604L.
2. Attach the positive and negative leads of the actuator to the green OUT terminal block keeping in mind
polarity.
3. Screw down the terminal block to secure the actuator leads.
It is important to use the green terminal block when connecting an external actuator. The OUT+ and OUT–
test points have low-pass filters and should only be used for oscilloscope and bench measurements.
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Hardware Configuration
4.4
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PWM Input
AUDIO
R40, 0Q
R41, NP
EN
PWM
R43, 0Q
MSP430
DRV2604L
C11
R8
P3.1
PWM/
GPIO
EN
OUT+
IN/TRIG
GND
JP1
VDD
SDA
SDA
SCL
SCL
OUT-
SDA SCL
Figure 20. External PWM Input
JP1
PWM Source
Shorted
MSP430
Open
External PWM using PWM test point
To control the DRV2604L using PWM, follow the instructions below:
1. Enter Additional Hardware Modes.
2. Select Mode 2 (00010'b) using the increment mode button (+).
• B1 – Disable Amplifier
• B2 – ERM Mode
• B3 – LRA Mode
• B4 – No function
3. Choose either the on-board ERM or LRA using buttons B1 or B2.
4. Apply the PWM signal to the PWM test point at the top of the board.
16
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4.5
External Trigger Control
AUDIO
R40, 0Q
R41, NP
EN
PWM
R43, 0Q
MSP430
DRV2604L
C11
R8
P3.1
PWM/
GPIO
EN
OUT+
IN/TRIG
GND
JP1
VDD
SDA
SDA
SCL
SCL
OUT-
SDA SCL
Figure 21. External Trigger Control
JP1
PWM Source
Shorted
MSP430
Open
External GPIO using PWM test point
The DRV2604L internal waveform sequencer can be triggered by controlling the IN/TRIG pin. There are
two external trigger options: edge trigger and level trigger. See the data sheet for more information on
these Input Trigger Modes.
In Mode 0 in the Additional Hardware Modes section, the DRV2604L can be set in external trigger mode
and then triggered by using the trigger button control on button B4 or alternatively by applying an external
trigger signal to the PWM test point.
4.5.1
MSP430 Trigger Control
1. Enter Additional Hardware Modes.
2. Select Mode 0 (00000’b) using the increment mode button (+).
• B1 – Select the on-board ERM
• B2 – Select the on-board LRA
• B3 – Trigger Select (1 = Internal Trigger, 2 = Ext. Edge, 3 = Ext. Level)
• B4 – Trigger the waveform sequence using the MSP430.
3. Fill the waveform sequencer with waveforms using the external I2C port.
4. Choose either the on-board ERM or LRA using buttons B1 or B2.
5. Select either External Edge (2) or External Level (3) trigger using the B3 button. The trigger type
appears in binary on the mode LEDs.
6. Apply the trigger signal to the IN/TRIG pin by pressing the B4 button.
4.5.2
External Source Trigger Control
1. Remove jumper JP1.
2. Enter Additional Hardware Modes.
3. Select Mode 0 (00000’b) using the increment mode button (+).
• B1 – Select the on-board ERM
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Hardware Configuration
4.
5.
6.
7.
4.6
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• B2 – Select the on-board LRA
• B3 – Trigger Select (1 = Internal Trigger, 2 = Ext. Edge, 3 = Ext. Level)
• B4 – Trigger the waveform sequence using the MSP430.
Fill the waveform sequencer with waveforms using the external I2C port.
Choose either the on-board ERM or LRA using buttons B1 or B2.
Select either External Edge (2) or External Level (3) trigger using the B3 button. The trigger type
appears in binary on the mode LEDs.
Apply the external logic signal to the PWM test point to trigger the waveform.
External I2C Input
AUDIO
R40, 0Q
R41, NP
EN
PWM
R43, 0Q
MSP430
DRV2604L
C11
R8
P3.1
PWM/
GPIO
EN
OUT+
IN/TRIG
GND
JP1
VDD
SDA
SDA
SCL
SCL
OUT-
SDA SCL
Figure 22. External I2C Input
The DV2604 can be controlled by an external I2C source. 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.
I2C communication is possible only when the EN pin is set high. To enable the DRV2604L and allow
external I2C control, follow the instructions below.
1. Enter Additional Hardware Modes.
2. Select Mode 0 (00000’b) using the increment mode button (+).
• B1 – Select the on-board ERM
• B2 – Select the on-board LRA
• B3 – Trigger Select (1 = Internal Trigger, 2 = Ext. Edge, 3 = Ext. Level)
• B4 – Trigger the waveform sequence using the MSP430.
3. Choose either the on-board ERM or LRA using buttons B1 or B2. Either button sets the EN pin high
and turns on the Active LED.
4. Begin controlling the DRV2604L using the external I2C source.
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4.7
Analog Input
AUDIO
R40, 0Q
R41, NP
EN
PWM
R43, 0Q
MSP430
DRV2604L
C11
R8
P3.1
PWM/
GPIO
EN
OUT+
IN/TRIG
GND
JP1
VDD
SDA
SDA
SCL
SCL
OUT-
SDA SCL
Figure 23. Analog Input
The analog input accepts an analog signal to control the envelope of the output waveform.
Use the following steps to use analog input mode:
1. Apply an analog signal (not PWM) to the AUDIO jack on the left side of the board. The tip of the
inserted male 3.5 mm jack is applied to the IN/TRIG pin of the DRV2604L. See Figure 23.
2. Enter Additional Hardware Modes.
3. Select Mode 5 (00101’b) using the increment mode button (+).
4. In Mode 5, choose button B1–B4, depending on the actuator and input coupling.
• B1 – AC Coupling – ERM
• B2 – DC Coupling – ERM
• B3 – AC Coupling – LRA
• B4 – DC Coupling – LRA
5. Enable the analog input signal.
5
Measurement and Analysis
The DRV2604L uses PWM modulation to create the output signal for both ERM and LRA actuators. To
measure and observe the DRV2604L output waveform, connect an oscilloscope or other measurement
equipment to the filtered output test points, OUT+ and OUT–.
OUT-
OUT+
OUT
470pF
100k
100k
470pF
From DRV2604L
Figure 24. Terminal Block and Test Points
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Measurement and Analysis
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The DRV2604L drives LRA and ERM actuators using a 20-kHz PWM modulated waveform, but only the
frequencies around the LRA resonant frequency or the ERM DC drive voltage are relevant to the haptic
actuator vibration. The higher frequency switching content does not contribute to the vibration strength of
the actuator and can make it difficult to interpret the modulated output waveform on an oscilloscope. The
oscilloscope image on the left shows the DRV2604L unfiltered waveform and the image on the right
shows a filtered version used for observation and measurement.
Figure 25. DRV2604L Unfiltered Waveform
Figure 26. DRV2604L Filtered Waveform
If the DRV2604LEVM-CT filter is not used, TI recommends using a 1st-order, low-pass filter with a cutoff
between 1kHz and 3.5kHz . Below is a recommended output filter for use while measuring and
characterizing the DRV2604L in the lab.
100k
OUT+
470 pF
ERM
Or
LRA
Ch1
Ch1-Ch2
(Differential )
Ch2
100k
OUT-
Oscilloscope
470 pF
Figure 27. Measuring the DRV2604L Output Signal with an Analog Low-Pass Filter
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Modifying or Reprogramming the Firmware
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6
Modifying or Reprogramming the Firmware
The MSP430 firmware on the DRV2604LEVM-CT can be modified or reprogrammed to create new haptic
effects or behaviors. Find the latest firmware source code and binaries on ti.com. Follow the instructions
below to modify or reprogram the DRV2604LEVM-CT.
1. Purchase one of the following MSP430G2553 compatible programmers:
• LaunchPad (MSP-EXP430G2) – requires the additional purchase of a header for J4
(recommended)
– Digi-Key: ED8650-ND
– Mouser: 575-500201
• MSP430-FET430UIF – requires a JTAG to Spy-Bi-Wire adapter (MSP-JTAGSBW if available)
2. Download and install Code Compose Studio (CCS) or IAR Embedded Workbench IDE.
3. Download the DRV2604LEVM-CT source code and binaries from ti.com.
4. Connect the programmer to an available USB port.
5. Connect the programmer to the SBW header on the DRV2604LEVM-CT.
6. In CCS,
(a) Open the project file by selecting Project→Import Existing CCS Project.
(b) Select Browse and navigate to the DRV2604LEVM-CT project folder, then press OK.
(c) Select the checkbox next to the DRV2604LEVM-CT project in the Discovered projects window and
then press Finish.
(d) Before compiling, navigate to Project→Properties→Build→MSP430 Compiler→Advanced
Options→Language Options and make sure the checkbox for Enable support for GCC extensions
(–gcc) is checked.
7. In IAR,
(a) Create a new MSP430 project in IAR,
(b) Select the MSP430G2553 device,
(c) Copy the files in the project folder downloaded from ti.com to the new project directory.
Figure 28 shows the connection between the MSP430 LaunchPad (MSP-EXP430G2) and the
DRV2604LEVM-CT.
USB
OUT
MSP
JP4
VBAT
DRV
MSP430
JP3
AUDIO
DRV2604L
Actuators
SBW
EMULATION
MSP-EXP430G2
Figure 28. LaunchPad Programmer Connection
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Modifying or Reprogramming the Firmware
6.1
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MSP430 Pin-Out
The DRV2604LEVM-CT contains a MSP430G2553 low-cost microcontroller which controls the board and
contains sample haptic effects. The pin-out for the microcontroller is found in Table 5.
Table 5. MSP430 Pin-Out
22
#
Label
Description
1
P1.1
Green LED
2
P1.2
Yellow LED
3
P1.3
Blue LED
4
P1.4
VREF+
5
P1.5
Audio-to-Haptics
6
P3.1
Enable
7
P3.0
Actuator Mode Selection
8
NC
9
P2.0
Button 1
10
P2.1
Button 2
11
P2.2
Button 3
12
P3.2
PWM
13
P3.3
WLED 0
14
P3.4
WLED 1
15
P2.3
Button 4
16
P2.4
+ Button
17
P2.5
– Button
18
P3.5
WLED 2
19
P3.6
WLED 3
20
P3.7
WLED 4
21
P1.6/SCL
I2C Clock
22
P1.7/SDA
I2C Data
23
SBWTDIO
Spy-Bi-Wire Data
24
SBWTCK
Spy-Bi-Wire Clock
25
P2.7
26
P2.6
LRA/ERM Load Switch
27
AVSS
Analog Ground
28
DVSS
Digital Ground
29
AVCC
Analog Supply
30
DVCC
Digital Supply
31
P1.0
32
NC
Red LED
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Schematic
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7
Schematic
Figure 29 shows the schematic for this EVM.
U3
Vbat
0.0
0603
R4
C7
+
DNP
0603
1.0ufd/6.3V
0402
GND
GND
FB2
1.5K
0402
600 Ohms/2A
0805
GND
GND
BTN1
BTN2
M3
M2
M1
M0
R15
R16
R17
R18
R19
249
0402
249
0402
249
0402
249
0402
249
0402
White
0603
R21
R22
R23
R24
R25
DNP
0402
DNP
0402
DNP
0402
DNP
0402
DNP
0402
DNP
0402
EXT INPUT
TP1
CAPTOUCH RESISTORS GND
FB1
Black
ENIN
Orange
White
0603
BTN0
BTN2
WLED0
BTN3
WLED1
BTN4
JP1
GND
GND
NC
P3.1
Vbat
P1.7/SDA
SBW
ACTIVE
P1.2
Green
0603
+3.3V
JP2
0.1ufd/6.3V
0402
R12
0805
Red
511
0402
511
0402
C10
SCL
0805
Yellow
R13
GND
1.0 ufd/16V
0402
GND
R14
1.0 ufd/16V
0402
GND
511
0402
Audio2Haptics
EN
SDA
GND
SCL
R40
Audio
R41
C9
U2
GND
0.1ufd/6.3V
0402
GND
DNP
0402
SJ-3523-SMT
3.5mm
GND
QFN32-RHB
Audio-to-Haptics
R42
GND
0.1ufd/10V
0603 X7R
R31
R32
R33
0.0
0402
LRA_OUT-
0.0
0402
OUT+
SCL
DNP
0402
R50
OUT-
JP4
100K/5%
0402
OUT+
C14
Black
GND
Orange
470pfd/50V
0402 X7R
OUT
GND
WCSP9-YZF
R51
C11
+3.3V
DNP
0402
DRV2604L
0.0
0402
0.0
0402
JP3
GND
R43
SDA
GND
LRA_OUT+
TS5A12301EYFPR
WCSP6-YFP
SDA
U1
SSOP8-DCT
LRA
GND
GND
IN/TRIG
TXS0102DCT
SCL-IN
GND
U5
0.1ufd/16V
0402
C1
U4
SDA-IN
AVM1
-
GND
C2
GND
GND
+
DNP
0402
C12
511
0402
0.1ufd/6.3V
0402
GND
I2C
B1
R11
GND
0.0
0402
511
0402
B3
GND
ERM
0.0
0402
R9
B4
0805
Blue
0805
Green
+3.3V
C8
GND
P1.1
ERM/LRA ACTUATOR
SWITCH
R30
Vbat
B2
LoadSwitch
SBWTDIO
P2.6
SBWTCK
9.76K
0402
P2.7
SBWTDIO
R7
NC
P1.3
DVCC
SBYBIWIRE
P1.0
P1.4
DVSS
MSP430G2553RHB
QFN32-RHB
AVCC
P1.6/SCL
GND
R36
DNP
0402
R34
LoadSwitch
0.0
0402
P1.5
AVSS
+3.3V
GND
R35
R8
U2
P3.7
GND
VBAT
P3.0
P3.6
WLED4
VREG
P3.5
WLED3
White
0603
MODE SELECT LEDS
GND
P2.1
P2.0
P3.2
P2.2
P3.3
P3.4
WLED2
P2.3
P2.4
P2.5
White
0603
Orange
Vbat
BTN5
White
0603
PWM
GND
600 Ohms/2A
0805
USB MINIB
M4
R20
BTN1
GND
BTN4
BTN5
Green
0603
R26
BTN3
5V
USB
WLED0
USB POWER
GND
TPS73633DBV
3.3V/400mA
GND
10ufd/16V
0805
WLED1
+5V-USB
C6
WLED2
GND
C5
100ufd/6.3V
TCT-TANT1206
WLED4
Green
6A/125V
DRV2604LYZF CAPTOUCH EVM
DRV
R5
+3.3V
BTN0
3.6V - 5.5V
POWER
SUPPLY
+5V-USB
MSP
WLED3
MSP / DRV
1-2: VBAT POWER
2-3: USB POWER
VBAT
100K/5%
0402
OUTC15
470pfd/50V
0402 X7R
Orange
Green
6A/125V
GND
GND
Figure 29. DRV2604LEVM-CT Schematic
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Layout
8
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Layout
Figure 30. X-Ray Top View
spacer
Figure 31. Top Copper
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Layout
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Figure 32. Layer 2 Copper
spacer
Figure 33. Layer 3 Copper
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Layout
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Figure 34. Bottom Copper
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Bill of Materials
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9
Bill of Materials
Table 6 lists the bill of materials.
Table 6. Bill of Materials
Item MFR Part Number
QTY
Ref Designators
Vendor Part Number
Description
MFR
Semiconductors
1
DRV2604LYZF
1
U1
DRV2604LYZF
HAPTIC DRIVER AUTO DETECT FOR LRA AND ERM WCSP9-YZF ROHS
TEXAS INSTRUMENTS
2
TXS0102DCTR
1
U4
296-21978-1
2-BIT BIDIR LEVEL TRANSLATOR SSOP8-DCT ROHS
TEXAS INSTRUMENTS
3
MSP430G2553IRHB3 1
2T
U2
595-P430G2553IRHB32T
MIXED SIGNAL MICRO 16KB FLASH 512B RAM QFN32-RHB ROHS
TEXAS INSTRUMENTS
4
TPS73633MDBVREP
1
U3
296-21283-1
VOLT REG 3.3V 400MA LDO CAP FREE NMOS SOT23-DBV5 ROHS
TEXAS INSTRUMENTS
5
TS5A12301EYFPR
1
U5
296-23757-1-ND
IEC LEVEL 4 ESD-PROTECTED 0.75-OHM ANALOG SWITCH WCSP6-YFP ROHS
TEXAS INSTRUMENTS
6
LTST-C190KGKT
2
5V,ACTIVE
160-1435-1-ND
LED,GREEN,2.0V,SMD0603,ROHS
LITE-ON INC.
7
LNJ037X8ARA
5
M0,M1,M2,M3,M4
LNJ037X8ARACT-ND
LED, WHITE 2.9V SMD0805 ROHS
PANASONIC
8
SML-LXT0805SRWTR
1
B1
67-1555-1
LED, RED 2.0V SMD0805 ROHS
LUMEX OPTO
9
SML-LXT0805GW-TR 1
B2
67-1553-1
LED, GREEN 2.0V SMD0805 ROHS
LUMEX OPTO
10
SML-LXT0805YW-TR
1
B3
67-1554-1
LED, YELLOW 2.0V SMD0805 ROHS
LUMEX OPTO
11
LTST-C171TBKT
1
B4
160-1645-1-ND
LED, BLUE 3.3V SMD0805 ROHS
LITE-ON INC.
Capacitors
12
C1005X5R1C105K05
0BC
2
C1,C2
445-4978-1-ND
CAP SMD0402 CERM 1.0UFD 16V 10% X5R ROHS
TDK CORP
13
C1005X5R0J104K
3
C8,C9,C10
445-1266-1
CAP SMD0402 CERM 0.1UFD 6.3V 10% X5R ROHS
TDK CORP
14
0805YD106KAT2A
1
C6
478-5165-1
CAP SMD0805 CERM 10UFD 16V X5R 10% ROHS
AVX
15
GRM155R60J105KE
19D
1
C7
490-1320-1
CAP SMD0402 CERM 1.0UFD 6.3V X5R 10% ROHS
MURATA
16
C1005X5R0J104K
1
C11
445-1266-1
CAP SMD0402 CERM 0.1UFD 6.3V 10% X5R ROHS
TDK CORP
17
C0402C471K5RACT
U
2
C14,C15
399-1025-1
CAP SMD0402 CERM 470PFD 50V 10% X7R ROHS
KEMET
18
TCTAL0J107M8R
1
C5
511-1498-1-ND
CAP TANT1206 100UFD 6.3V 20% TCT SERIES ROHS
ROHM
Resistors
19
ERJ-2RKF9761X
1
R7
P9.76KLCT-ND
RESISTOR SMD0402 THICK FILM 9.76K OHMS 1/10W 1% ROHS
PANASONIC
20
RMCF0402ZT0R00
5
R8,R32,R33,R34,R36
RMCF0402ZT0R00CT
ZERO OHM JUMPER SMT 0402 0 OHM 1/16W,5% ROHS
STACKPOLE ELECTRONICS
21
RC0402FR-07511RL
5
R9,R11,R12,R13,R14
311-511LRCT-ND
RESISTOR SMD0402 THICK FILM 511 OHMS 1% 1/16W ROHS
YAGEO
22
ERJ-2GEJ152
1
R26
RESISTOR,SMT,0402,THICK FILM,5%,1/16W,1.5K
Panasonic
23
RMCF0603ZT0R00
1
R5
RMCF0603ZT0R00CT-ND RESISTOR SMD0603 ZERO OHMS 1/10W ROHS
STACKPOLE ELECTRONICS
24
ERJ-2RKF2490X
5
R15,R16,R17,R18,R1
9
P249LTR-ND
RESISTOR,SMT,0402,249 OHM,1%,1/16W
Panasonic
25
CRCW04020000Z0E
D
2
R40,R43
541-0.0JCT
ZERO OHM JUMPER SMT 0402 0 OHM 1/16W,5% ROHS
VISHAY
26
ERJ-2GEJ104
2
R50,R51
P100KJCT
RESISTOR SMD0402 THICK FILM 100K OHMS 1/16W 5% ROHS
PANASONIC
SLOU390A – May 2014 – Revised June 2014
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DRV2604L ERM, LRA Haptic Driver Evaluation Kit
Copyright © 2014, Texas Instruments Incorporated
27
Bill of Materials
www.ti.com
Table 6. Bill of Materials (continued)
Item MFR Part Number
QTY
Ref Designators
Vendor Part Number
Description
MFR
Ferrite Beads
27
MPZ2012S601A
2
FB1,FB2
445-2206-1
FERRITE BEAD SMD0805 600 Ohms 2A ROHS
TDK
Headers, Jacks, and Shunts
28
LPPB061NGCN-RC
1
SBW
S9010E-06
HEADER THRU FEMALE 1X6-RA 50LS GOLD ROHS
SULLINS
29
PBC03SAAN
3
DRV,I2C,MSP
S1011E-03-ND
HEADER THRU MALE 3 PIN 100LS GOLD ROHS
SULLINS
30
PBC02SAAN
1
JP2
S1011E-02
HEADER THRU MALE 2 PIN 100LS GOLD ROHS
SULLINS
31
PBC02SAAN
3
JP1,JP3,JP4
HEADER THRU MALE 2 PIN 100LS GOLD ROHS
SULLINS
32
UX60-MB-5ST
1
USB
H2959CT
JACK USB MINIB SMT-RA 5PIN ROHS
HIROSE
33
SJ-3523-SMT
1
Audio
CP-3523SJCT-ND
JACK AUDIO-STEREO MINI(3.5MM ,3-COND SMT-RA ROHS
CUI STACK
34
SPC02SYAN
6
MSP (2-3), DRV (23), JP1, JP2, JP3,
JP4
S9001-ND
SHUNT BLACK AU FLASH 0.100LS CLOSED TOP ROHS
SULLINS
35
1725656
2
OUT,VBAT
277-1273
TERMINAL BLOCK MPT COMBICON 2PIN 6A/125V GREEN 100LS ROHS
PHOENIX CONTACT
Test Points and Switches
36
5011
2
GND,TP1 ((Solder so
that color ring is
secured)
5011K
PC TESTPOINT BLACK 063 HOLE ROHS
KEYSTONE ELECTRONICS
37
5003
4
PWM,ENIN, OUT+,
OUT– (Solder so that
color ring is secured)
5003K
PC TESTPOINT, ORANGE, ROHS
KEYSTONE ELECTRONICS
38
NRS-2574
1
AVM1
NRS-2574
ACTUATOR VIBRATION MOTOR 1,3V 9000 RPM ROHS
SANYO
39
ELV1036A
1
-
-
ACTUATOR - LINEAR VIBRATOR, 2VRMS
AAC
40
-
1
-
-
Metal Block (Custom Block, Heavy Metal, See metal block spec)
Heavy Metal
41
3-5-468MP
1
-
3M9724-ND
TAPE TRANSFER ADHESIVE 3" X 5YD
3M
42
2-5-4466W
1
-
3M9962-ND
TAPE POLY FOAM 2" x 5YD
3M
Components not Assembled
43
TestPoint_SMDSquare_2.0mm
2
LRA_OUT+,
LRA_OUT–
TESTPOINT SMD SQUARE 2.0mm
44
R0402_DNP
9
R20,R21,R22,R23,R2
4,R25,R30,R31,R35
R0402_DNP
45
R0603_DNP
1
R4
RMCF0603ZT0R00CT-ND R0603_DNP
STACKPOLE ELECTRONICS
46
R0402_DNP
1
R41
P4.99KLCT-ND
R0402_DNP
PANASONIC
47
R0402_DNP
1
R42
541-0.0JCT
R0402_DNP
VISHAY
28
DRV2604L ERM, LRA Haptic Driver Evaluation Kit
SLOU390A – May 2014 – Revised June 2014
Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
Revision History
www.ti.com
Revision History
Changes from Original (May 2014) to A Revision ........................................................................................................... Page
•
•
Changed C1 and C2 designator value to 1.0 μF in schematic..................................................................... 23
Changed contents of item 12 in BOM. ................................................................................................ 27
SLOU390A – May 2014 – Revised June 2014
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Revision History
Copyright © 2014, Texas Instruments Incorporated
29
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