DA7282-00FVC datasheet(16/77 Pages) DIALOG

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DA7282

LRA/ERM Ultra-Low Power Haptic Driver with Multiple

Input Triggers and Integrated Waveform Memory

Datasheet

Revision 3.0

30-Jul-2019

CFR0011-120-00

16 of 77

resonance point and achieve the maximum possible actuator acceleration for a set input power, see

Section 5.3 and Section 5.7.1.

I2C and PWM Input Streaming

Haptic playback data can be streamed externally either via I2C direct register override or from a PWM

data source, see Section 5.2.2. The external input data PWM frequency is independent of the output

PWM signal frequency driven to the actuator. The input PWM signal is low-pass filtered to create a

varying DC level that is the envelope for the drive across the actuator.

Ultra-Low Power Consumption when Disabled

In the OFF state when VDDIO_EN = 0 V, DA7282 has an ultra-low current consumption from the power

supply, at typically 5 nA. This is the lowest power state of the device. In OFF state the device is fully

reset and register contents are lost, see Sections 5.2.1 and 5.7.19.

Low Latency I2C/GPI Wake-Up from IDLE State

The device supports low latency (0.75 ms) wake-up from IDLE state, which is the lowest power state

(typically 0.68 µA from VDD). Wake-up is triggered by either GPI or I2C activity. I2C is fully functional in

all modes including IDLE state and DA7282 retains register settings in all modes, see Section 5.2.1.

Three GPI Sequence Triggers for up to Six Independent Haptic Responses

DA7282 supports up to three GPI inputs which can be used to trigger low-latency playback of up to

six distinct sequences from IDLE state, see Section 5.2.7. Triggering is activated on events caused

by rising or falling edges, or both. The sequence playback is configurable and a GPI can be

associated with either one or two sequences. In the second case, odd events trigger one sequence,

while even events another.

On-Board Waveform Memory with Amplitude, Time, and Frequency Control

DA7282 contains 100 bytes of highly optimized on-board Waveform Memory for user programmable

haptic sequences, see Section 5.8. The Dialog Semiconductor specific format allows control of not

only amplitude and time, but also frequency during the playback of a haptic sequence. This is

specifically intended for use with wideband and dual mode actuators to create a richer user

experience.

Active Acceleration and Rapid Stop for High-Fidelity Haptic Feedback

By measuring and responding to the BEMF of the actuator, DA7282 supports Active Acceleration

which improves actuator response both when increasing and decreasing drive amplitude by

overdriving or underdriving relative to the desired drive level. Similarly, Rapid Stop minimizes the

time needed for the actuator to come to a complete stop by driving against the direction of actuator

movement. These two features enable a high-fidelity haptic response of the actuator and improve on

its inherent physical performance and mechanical time constant, see Section 5.4.

Continuous Actuator Diagnostics and Fault Handling

DA7282 monitors the actuator impedance at the start of each haptic sequence. The value of the

impedance can be read back from a dedicated register, see Section 5.7.3. In addition, impedance,

BEMF, and resonant frequency faults are flagged with automatic shutdown and notification via the

nIRQ pin, see Section 5.6.6.

No Software Requirements with Embedded Operation

The device can function in a stand-alone embedded operation where no host action is needed to

clear generated faults and the device will attempt to drive on each request. This also allows operation

in GPI trigger mode without the need for a host device or host communication, see Section 5.7.7.

DA7282-00FVC Datasheet(PDF) 16 Page - Dialog Semiconductor

DA7282-00FVC Datasheet(HTML) 16 Page - Dialog Semiconductor

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