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Industry’s Most Highly Integrated Piezo Haptic DriverEric Siegel
Product Marketing Engineer, Touch Screen Controllers and Haptics
THIS INFORMATION EMBARGOED UNTIL JULY 20
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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
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Touch ecosystem
Touch Panel and Display
Applications Processor/Chipset reference design
HapticsSW
TSC
Haptics Driver
Touch Location
Haptics effects
Haptics actuators
HapticsSW
Touch Screen
Controller
Haptics Driver
Note: Haptics Software stored in only one of two locations
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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
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Introducing the DRV8662
•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•50-200 - 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
Industry’s most integrated single-chip piezo haptic driver
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Feel the difference
• Get haptic feedback from the smallest actions onscreen
• Feel each time your “bird missile” ruffles its feathers or slams into the wooden blocks
• 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
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Applications
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Actuator response
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
Response and accuracy of haptics effects
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Frequency
Streng
th
LRAdirect drive
ERMspinning
ERM/LRApulsing
Bandwidth profilesPiezo actuators offer higher bandwidth than inertial actuators
50Hz 175Hz 300Hz
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<1ms ~30-60ms
Faster response time Piezo (DRV8662)
ERM, LRA
Response time of the DRV8662Inertial Actuators vs. Piezo Actuators
Time
Streng
th
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Competition vs. DRV8662
FlybackSolutionBaseband
1:N
R3
EN
IN+
IN-
VBAT
SW
FB
GATE
SOURCE
GND
BATTERY VOLTAGE
R2
R1
C2
C1
HapticPiezo
Competition’s flyback solution TI DRV8662 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
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DRV8662 evaluation kit
Touch panel glass with Piezo Actuator assembly
DRV8662 MSP430G2253
Complete Haptics Evaluation• I2C Interface through MSP430
• Analog / PWM input option to the DRV8662 with I2C bypass
• Programmable MSP430 with sample code
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Summary
Small solution size
50 to 200-Vpp differential drive
Flexible architecture
Low solution cost
50% smaller with no external transformer
40% lower cost with no expensive external transformer
High-definition haptics effects
Can drive single or multi-layer piezo actuators
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For your readers
• DRV8662 Product Folder– www.ti.com/drv8662-pr
• “What is haptics?” video– www.ti.com/drv8662video-pr
• Technical support for touch products– www.ti.com/touchforum-pr
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Thank You