1. THIS INFORMATION EMBARGOED UNTIL JULY 20
Industry’s Most Highly Integrated Piezo Haptic Driver
Eric Siegel
Product Marketing Engineer, Touch Screen Controllers and Haptics
THIS INFORMATION EMBARGOED UNTIL JULY 20

2. Cell Phones & Handhelds Portable Gaming Devices
What is Haptics?
Touch screens are replacing traditional user interfaces
Touch screens have one major disadvantage
No physical or mechanical feedback when the screen is pressed or an event occurs
Loss of tactile or haptic feedback
The solution is haptics….
Haptics refers to the sense of touch and is a technology that provides mechanical feedback through the use of vibrations to simulate specific events or effects.
Benefits of Haptics
Improves task performance
Increases user satisfaction
Provides a more realistic experience
Cell Phones & Handhelds
Tablets
Laptops & Desktops
Portable Gaming Devices
Touch Screen Markets
Cell phones and handhelds
Tablets
Laptops and desktops
Portable gaming devices
Advantages of Touch screens over traditional hardware (ie – keyboard and mouse)
Direct interaction with on-screen content
In game controls
Directly highlight and edit documents
Rich input and gesture vocabulary
Improved mechanical durability over traditional keyboard
No moving parts
No more replacing track balls, keys, or the like
Flexibility provided by a dynamic display
Manufacturer and user customizations
Application specific customizations
Touch screens have one major disadvantage
No physical or mechanical feedback when the screen is pressed.
Increased errors with text entry 2

3. Touch Panel and Display
Touch ecosystem
Touch Panel and Display
Applications Processor/
Chipset reference design
Haptics SW
TSC
Haptics Driver
Touch Location
Haptics effects
Haptics actuators
Touch Screen Controller
Haptics Driver
Talking Points
Here we can see the typical touch ecosystem. It starts at the touch screen when a touch is detected. The coordinates of the touch are deciphered and sent to the applications processors.
The Apps processor then does whatever operation is necessary in reaction to the touch.
If haptics is part of the equation, a haptics acknowledgement command is sent to the haptics driver. The driver in turn drives the haptics actuators.
Note: The software for the waveform can be stored on the apps processor or the driver depending on topology.
Note: Haptics Software stored in only one of two locations
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4. Piezo actuator-based haptics
Enables high-definition and localized Haptics effect generation
Piezo actuators are very thin (<1mm)
Piezo actuators are either single-layer or multi-layer
Single Layer
Need up to 200 Vp-p to drive
More cost effective
Have low capacitance and can be driven with lower current
Multi-layer
Need up to 50Vp-p to drive multi-layer piezos
Cost scales linearly with the number of piezo layers
Have high capacitance and needs higher current drive
Talking Points
Piezo-based actuators offer many improved benefits over motor-based actuators.
In general, single layer haptics are a more cost-effective solution; however, you’ll have a higher Peak-to-Peak Voltage (VP-P) vs. the multilayer piezo modules, which due to the higher density of layers, lowers the drive voltage but drives up the cost.
It should be noted that there are some differences in operation for piezo beams vs. disks:
Only one bender is necessary for most touch screen devices up to around 7-8 inches.
Disks require four disks for uniform screen displacement.
Bender displacement of the screen is parallel to the screen
Disk displacement is perpendicular in the z direction.

5. Introducing the DRV8662
Industry’s most integrated single-chip piezo haptic driver
High analog integration (boost converter, diode)
50% smaller solution size than leading competition
Does not need an external transformer
40% lower system solution cost than leading competition
Analog input
Can be driven by DAC or filtered pulse width modulation (PWM)
GPIO gain control
Supports wide range of piezo actuator voltages
volt peak to peak (Vpp) differential outputs
Drive high-definition inaudible haptics effects
Haptics frequencies up to 500-Hz
Enables wide variety of high-resolution haptics effects
Talking Points
The DRV8662 offers a refreshed and innovative solution to driving piezo actuators vs. the leading competitors solution.
Highlights include:
Read bullets.
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6. Feel the difference Localized responses on the screen
Pluck a string on your guitar app and feel the frequency associated with that string, in the exact spot you’re touching
Get haptic feedback from the smallest actions onscreen
Feel each time your “bird missile” ruffles its feathers or slams into the wooden blocks
Talking Points
How exactly do piezo-based actuators make a difference? Imagine playing your guitar app on your android phone and instead of just hearing the tone associated with each string, you feel the exact frequency associated with it as well.
Or think about the next time you play Angry Birds. You can feel each bird’s impact as it crashes through to defeat the evil pigs.
Outside of the consumer realm, think about a worker in an industrial setting working with dangerous machinery. With localized haptics feedback, he can reach back to a touch screen, get a vibration acknowledging his touch, and never have to look away from the machine.
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7. Applications Talking Points
The DRV8662 is targeted toward a number of applications, including:
Laptops
Digital cameras
Portable gaming consoles
E-books
Home Appliances
Industrial Equipment
Joysticks
Mp3 players
Cell phones and smartphones

8. Actuator response Inertial Piezo
Response and accuracy of haptics effects
Inertial
Low bandwidth
Start-up and response times are slower
Lower bandwidth limits types of effects
Motor (ERM) or linear actuator (LRA)
DRV8601
Piezo
High bandwidth
Fastest response time and largest bandwidth
Wider range of effects
Piezo bender or piezo module
DRV8662
Talking Points
Let’s take a look at the response of two types of actuators. For practical purposes, let’s group them into two categories, inertial-based (or ERMs and LRAs) and Piezo.
Inertial-based solutions tend to be bandwidth limited, with slower start-up and response times. As a result, they provide lower-resolution haptics effects.
Piezo-based modules do not suffer from the same limits as inertial-based actuators, and have an extremely fast response time and wide range amplitude outputs, contributing to the ability to create a wide range of detailed high resolution effects.
These are the effects that you can find in applications with the DRV8662.
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9. Bandwidth profiles ERM ERM/ LRA Piezo direct drive Piezo pulsing
Piezo actuators offer higher bandwidth than inertial actuators
Frequency
Strength
Piezo direct drive
Piezo pulsing
ERM
spinning
ERM/
LRA
pulsing
LRA
direct drive
ERM – can either be driven using pulses or continuously driven at a specific voltage; however, when the ERM is driven with a single voltage the amplitude and frequency cannot be varied independently.
LRA – the LRA can be driven using pulses or amplitude modulate; however, the carrier frequency must always be the resonant frequency (175 Hz)
Piezo – can be driven using pulses or directly driven with a specific frequency, giving it the largest bandwidth.
50Hz
175Hz
300Hz

10. Response time of the DRV8662
Inertial Actuators vs. Piezo Actuators
<1ms
~30-60ms
Faster response time
Piezo (DRV8662)
ERM, LRA
Strength
Talking Points
Here you can see the response time of each type of actuator.
The inertial-based ERMs and LRAs have a more delayed response time of 30-60ms
The piezo-based actuators, driven by the DRV8662, have < 1ms response time, making them very suitable for typing applications in tablets and portable devices such as handsets or gaming systems.
Time
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11. TI DRV8662 Integrated, high-voltage process solution
Competition vs. DRV8662
Competition’s flyback solution
TI DRV Integrated, high-voltage process solution
Low voltage process
Transformer – bulky, expensive
External FET
External eiode
Difficult charge/discharge control schemes that are separated
Total board space ~200mm2
High voltage process
Transformer-less
Integrated FET
Integrated diode
Simple Op-Amp voltage controlled feedback allowing adjustable gain
Total Board Space ~100mm2
Talking Points
The leading competing solution for piezo-based haptics is what is known as a “flyback” solution.
It is constructed using a low-voltage process, which requires a bulky transformer.
Furthermore, the FET and diode are not integrated and the total board space is significantly large (~120mm2)
Due to TI’s high-voltage process, the DRV8662 does not require an external transformer, and contains an integrated FET and diode, vastly reducing system cost and creating a footprint of almost half the area of the flyback solution.

12. DRV8662 evaluation kit Complete Haptics Evaluation
Touch panel glass with Piezo Actuator assembly
MSP430G2253
DRV8662
Complete Haptics Evaluation
I2C Interface through MSP430
Analog / PWM input option to the DRV8662 with I2C bypass
Programmable MSP430 with sample code
DRV8662 EVMs will be available at time of launch as well as a reference design that can be incorporated into any current design with schematics and design files available on ti.com.
The EVM will also come with a Piezo module that allows you to evaluate and see the benefits of the piezo experience.
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13. Flexible architecture
Summary
Small solution size
50% smaller with no external transformer
Low solution cost
40% lower cost with no expensive external transformer
50 to 200-Vpp
differential drive
High-definition haptics effects
Flexible architecture
Can drive single or multi-layer piezo actuators
Talking Points
The DRV8662 opens the doors for great innovation and user experience by enabling piezo-based haptics effects.

14. For your readers DRV8662 Product Folder “What is haptics?” video
“What is haptics?” video
Technical support for touch products

15. Thank You