DA7281-00FVC datasheet(21/88 Pages) RENESAS

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DA7281

LRA/ERM Haptic Driver with Multiple I²C

Addresses, Integrated Waveform Memory, and

Wideband Support

Datasheet

Revision 3.1

10-Feb-2022

CFR0011-120-00

21 of 87

Additional Features

DA7281 also features:

● A temperature and supply stable (±1.5 %) internal oscillator which guarantees consistent haptic

playback in the frequency domain over a wide range of operating conditions.

● Automatic over-temperature warning and shutdown capability.

● Low pad leakage current (typ. < 50 nA, for all pads combined).

● Low idle current from VDDIO (typ. 130 nA at 1.8 V).

● I2C operation down to VDDIO = 1.35 V.

● Output PWM frequency, at 187.5 kHz, is 167.5 kHz away from the audio band and at a non-audio

sample rate multiple. This prevents audible fold back via supply disturbance common in near-

audio-band switching haptic drivers.

● Easy to use Dialog SmartCanvas™ GUI with a user tab for fast device setup without the need to

directly interact with registers and an intuitive graphical environment for Waveform Memory

editing and visualization.

5.2

Functional Modes

5.2.1

System States

DA7281 features IDLE and STANDBY states ensuring lowest power consumption and lowest start-

up latency in different operating conditions. In addition, when any fault is detected, the device returns

directly to the IDLE state. Figure 8 shows the device states and the transitions into and out of each

state.

When a power supply is applied, DA7281 loads the register default settings. Once BOOT is

complete, DA7281 remains in the IDLE state and awaits further I2C communication.

DA7281 enters the DRIVE state when playback of a haptic sequence begins. There are several

different operating modes for playback, see Section 5.2.2.

On completion of playback, DA7281 leaves DRIVE state and returns either to IDLE state (for low

power consumption) or STANDBY state (for low latency-to-drive). This is configured using

STANDBY_EN.

If a fault condition occurs, DA7281 returns to the IDLE state, see Section 5.6.6 .

DA7281-00FVC Datasheet(PDF) 21 Page - Renesas Technology Corp