DRV2624 Datasheet, PDF (10/79 Pages) Texas Instruments – DRV2624 Ultra Low Power Closed-Loop LRA/ERM Haptic Driver with Internal Memory

DRV2624
SLOS893A – DECEMBER 2015 – REVISED DECEMBER 2015
8 Detailed Description
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8.1 Overview
The DRV2624 device is a haptic driver that relies on a proprietary closed-loop architecture to deliver sharp,
strong, and consistent haptic effects while optimizing power consumption. The internal memory and loopable
waveform sequencer, the automatic overdrive, and the braking simplifies the process of generating crisp and
optimum haptic effects, reducing the burden imposed into the processing unit. The DRV2624 device has an
automatic go-to-standby state and a battery preservation function to help reduce power consumption without
user intervention. The NRST pin allows for a full shutdown state for additional power savings. The waveform
shape selection allows for sine-wave and square-wave drive to customize the haptic feel as well as the
audible performance. Off-resonance driving with automatic braking simplifies the implementation of non-
resonant haptic solutions.
8.2 Functional Block Diagram
2.7 V ± 5.5 VVDD
NRST
TRIG/INTZ
SDA
SCL
1.8 V REG
RAM
Reg
1 kB
Map
Supply
Correction
Battery
Monitor
I²C
I/F
REG
Control and Playback Engine
Loopable
Waveform
Sequencer
Waveform Shape
Select (LRA)
Impedance
Based Actuator
Diagnostics
Off-
Resonance
Driving (LRA)
Automatic
Over-Drive
and Braking
Dynamic and
Programmable
Output Clamp
Automatic Resonance Tracking
and Reporting
Thermal
Protection
VDD
Gate
Drive
Back-EMF
Detection
Short Circuit
Protection _VDD
Gate
Drive
OUT+
LRA
M _or
ERM
OUT±
GND
8.3 Feature Description
8.3.1 Support for ERM and LRA Actuators
The DRV2624 device supports both ERM and LRA actuators. The LRA_ERM bit must be configured to select the
type of actuator that the device uses.
8.3.2 Smart-Loop Architecture
The smart-loop architecture is an advanced closed-loop system that optimizes the performance of the actuator
and allows for failure detection. The architecture consists of automatic resonance tracking and reporting (for an
LRA), automatic level calibration, accelerated startup and braking, resistance based diagnostics routines, and
other proprietary algorithms.
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