DRV2604L Datasheet, PDF (11/73 Pages) Texas Instruments – DRV2604L 2- to 5.2-V Haptic Driver for LRA and ERM with Internal Memory and Smart-Loop Architecture

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8 Detailed Description
DRV2604L
SLOS866D – MAY 2014 – REVISED JUNE 2015
8.1 Overview
The DRV2604L 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 DRV2604L 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 DRV2604L 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 DRV2604L device also allows for open-loop driving by using
internally-generated PWM.
The DRV2604L device includes enough integrated RAM to allow the user to preload over 100 customized
waveforms. The 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 memory playback
engine and play waveforms directly from the host through the I²C.
The DRV2604L device features a trinary-modulated output stage that provides more efficiency than linear-based
output drivers.
8.2 Functional Block Diagram
V_DD
Supply
correction
RAM
Gate
drive
OUT+
SDA
SCL
EN
IN/TRIG
REG
I²C I/F
REG
Control and
playback
engine
Back-EMF
detection
Gate
drive
LRA
M _or
ERM
OUT±
GND
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