DRV2604L Datasheet, PDF (30/73 Pages) Texas Instruments – DRV2604L 2- to 5.2-V Haptic Driver for LRA and ERM with Internal Memory and Smart-Loop Architecture

DRV2604L
SLOS866D – MAY 2014 – REVISED JUNE 2015
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Programming (continued)
8.5.8 Waveform Playback Programming
8.5.8.1 Data Formats for Waveform Playback
The DRV2604L smart-loop architecture has three modes of operation. Each of the modes can drive either ERM
or LRA devices.
1. Open-loop mode
2. Closed-loop mode (unidirectional)
3. Closed-loop mode (bidirectional)
Each mode has different advantages and disadvantages. The DRV2604L device brings new cutting-edge
actuator control with closed-loop operation around the back-EMF for automatic overdrive and braking. However,
some existing haptic implementations already include overdrive and braking that are embedded in the waveform
data. Open-loop mode is used to preserve compatibility with such systems.
The following sections show how the input data for each DRV2604L interface is translated to the output drive
signal.
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