Texas Instruments DRV2605EVM-CT Datenbogen
Supply
correction
I
2
C I/F
REG
Back-EMF
detection
ROM
Gate
drive
drive
Gate
drive
drive
Control and
playback
engine
M
LRA
or
ERM
OUT
±
OUT+
GND
REG
IN/TRIG
SDA
SCL
EN
V
DD
SLOS825C – DECEMBER 2012 – REVISED SEPTEMBER 2014
7 Detailed Description
7.1 Overview
The DRV2605 device is a haptic driver that relies on the back-EMF produced by an actuator to provide a closed-
loop system that offers extremely flexible control of LRA and ERM actuators over a shared I
loop system that offers extremely flexible control of LRA and ERM actuators over a shared I
2
C-compatible bus or
PWM input signal. This schema helps improve actuator performance in terms of acceleration consistency, start
time, and brake time.
time, and brake time.
The improved smart-loop architecture inside the DRV2605 device provides effortless auto-resonant drive for
LRA, as well as feedback-optimized ERM drive allowing for automatic overdrive and braking. These features
create a simplified input waveform paradigm as well as reliable motor control and consistent motor performance.
The DRV2605 device also allows for open-loop driving by using internally-generated PWM. Additionally, the
audio-to-vibe mode automatically converts an audio input signal to meaningful haptic effects.
LRA, as well as feedback-optimized ERM drive allowing for automatic overdrive and braking. These features
create a simplified input waveform paradigm as well as reliable motor control and consistent motor performance.
The DRV2605 device also allows for open-loop driving by using internally-generated PWM. Additionally, the
audio-to-vibe mode automatically converts an audio input signal to meaningful haptic effects.
The DRV2605 device offers a licensed version of TouchSense 2200 software from Immersion which eliminates
the need to design haptic waveforms because the software includes over 100 licensed effects ( 5 ERM libraries
and 1 LRA library) and audio-to-vibe features. These waveforms can be instantly played back through an I
the need to design haptic waveforms because the software includes over 100 licensed effects ( 5 ERM libraries
and 1 LRA library) and audio-to-vibe features. These waveforms can be instantly played back through an I
2
C or
can be triggered through a hardware trigger pin. Additionally, the real-time playback mode allows the host
processor to bypass the library playback engine and play waveforms directly from the host through the I
processor to bypass the library playback engine and play waveforms directly from the host through the I
2
C.
The DRV2605 device features a trinary-modulated output stage that provides more efficiency than linear-based
output drivers.
output drivers.
7.2 Functional Block Diagram
Copyright © 2012–2014, Texas Instruments Incorporated
9
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