DRV2667 Datasheet, PDF (1/6 Pages) Texas Instruments – Piezo Haptic Driver with Boost, Digital Front End, and Internal Waveform Memory

DRV2667
www.ti.com
SLOS807 – JANUARY 2013
Piezo Haptic Driver with Boost, Digital Front End, and Internal Waveform Memory
Check for Samples: DRV2667
FEATURES
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• Integrated Digital Front End
– I²C Bus Control up to 400 kHz
– Advanced Waveform Synthesizer
– 2 kB Internal Waveform Memory
– Internal 100 Byte FIFO Interface
– Immersion TS5000 Compliant
– Optional Analog Inputs
• High Voltage Piezo-Haptic Driver
– Drives up to 100 nF at 200 V_PP and 300 Hz
– Drives up to 150 nF at 150 V_PP and 300 Hz
– Drives up to 330 nF at 100 V_PP and 300 Hz
– Drives up to 680 nF at 50 V_PP and 300 Hz
– Differential Output
• Integrated 105 V Boost Converter
– Adjustable Boost Voltage
– Adjustable Boost Current Limit
– Integrated Power FET and Diode
– No Transformer Required
• Fast Start Up Time of 2 ms (typical)
• Wide Supply Voltage Range of 3 V to 5.5 V
• 1.8 V Compatible, VDD Tolerant Digital Pins
• Available in a 4 mm × 4 mm × 0.9 mm QFN
package (RGP)
• Pin-Similar with DRV8662 and Pin-Compatible
with DRV2665
APPLICATIONS
• Mobile Phones
• Tablets
• Portable Computers
• Keyboards and Mice
• Electronic Gaming
• Touch Enabled Devices
DESCRIPTION
The DRV2667 is a piezo haptic driver with integrated
105 V boost switch, integrated power diode,
integrated fully-differential amplifier, and integrated
digital front end. This versatile device is capable of
driving both high-voltage and low-voltage piezo haptic
actuators. The input signal can be driven over the I²C
port or the analog inputs.
The DRV2667 digital interface is available via an I²C
compatible bus. A digital interface relieves the costly
processor burden of PWM generation or additional
analog channel requirements in the host system. Any
writes to the internal FIFO will automatically wake up
the device and begin playing the waveform after the 2
ms internal startup procedure. When the data flow
stops or the FIFO under-runs, the DRV2667 will
automatically enter a pop-less shutdown procedure.
The DRV2667 also includes deep volatile waveform
memory to store and recall waveforms with minimal
latency as well as an advanced waveform synthesizer
to construct complex haptic waveforms with minimal
memory usage. This provide a means of hardware
acceleration, relieving the host processor of haptic
generation duties as well as minimizing bus traffic
over the haptic interface.
The boost voltage is set using two external resistors,
and the boost current limit is programmable via the
R_EXT resistor. A typical start-up time of 2 ms makes
the DRV2667 an ideal piezo driver for fast haptic
responses. Thermal overload protection prevents the
device from being damaged when overdriven.
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3 V to 5.5 V
R_PU R_PU
I2C
Analog
Input
L1
C_VDD
DRV2667
VDD
SW
VREG
VBST
C_VREG
PVDD
FB
SDA
SCL
IN+
OUT+
IN-
OUT-
C_VBST
R1
R2
Piezo
Actuator
VPUMP
REXT
C_PUMP
GND
R_EXT
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated