DRV2605L-Q1 Datasheet, PDF (9/67 Pages) Texas Instruments – Automotive Haptic Driver for LRA and ERM

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7 Detailed Description
DRV2605L-Q1
SLOS874A – OCTOBER 2015 – REVISED OCTOBER 2015
7.1 Overview
The DRV2605L-Q1 device is a low-voltage 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 I²C-
compatible bus or PWM input signal. This schema helps improve actuator performance in terms of acceleration
consistency, start time, and brake time.
The improved smart-loop architecture inside the DRV2605L-Q1 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 DRV2605L-Q1 device also features an automatic transition to open-loop operation in the event that an LRA
actuator is not generating a valid back-EMF voltage and automatic synchronization with the LRA when the LRA
is generating a valid back-EMF voltage. The DRV2605L-Q1 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 DRV2605L-Q1 device offers a licensed version of TouchSense 2200 software from Immersion which
eliminates the requirement to design haptic waveforms because the software includes over 100 licensed effects
(6 ERM libraries and 1 LRA library) and audio-to-vibe features. These waveforms can be instantly played back
through an I²C 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 I²C.
The DRV2605L-Q1 device features a trinary-modulated output stage that provides more efficiency than linear-
based output drivers.
7.2 Functional Block Diagram
V_DD
Supply
correction
ROM
Gate
drive
OUT+
SDA
SCL
EN
IN/TRIG
REG
2
I C I/F
REG
Control and
playback
engine
Back-EMF
detection
Gate
drive
LRA
M _or
ERM
OUT±
GND
Copyright © 2015, Texas Instruments Incorporated
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