Renesas / Dialog DA7280 LRA/ERM Haptic Drivers

Renesas / Dialog DA7280 LRA/ERM Haptic Drivers offer automatic closed-loop linear resonant actuator (LRA) resonant frequency tracking. They feature a wideband operation that fully utilizes the capabilities of newer wideband and multidirectional LRAs. The differential output drive architecture and continuous actuator motion sensing enable efficient, calibration-free playback and minimize software complexity.

The Dialog DA7280 LRA/ERM Haptic Drivers provide wake-up on General Purpose Input (GPI) sequence triggers and I2C activity that allows the DA7280 to automatically return to a low quiescent current state (typically 0.36µA) between playbacks. The DA7280 significantly extends battery life in mobile systems, with only 20% of the nearest alternative solution's idle current. An integrated Waveform Memory allows haptic sequences to be preloaded to DA7280, reducing system complexity. Independent sequences with low latency (0.75ms) can be triggered by up to three separate input pins without host interaction.

The DA7280 Drivers actively monitor the back electromotive force (BEMF) while continuously driving and apply closed-loop Active Acceleration and Rapid Stopping for sharper clicks and higher fidelity.

Features

LRA or ERM drive capability
Automatic LRA resonant frequency tracking
Wideband LRA support
I²C and PWM input streaming
Low latency (0.75ms) I²C/GPI wake-up from low power consumption IDLE state, I_Q = 0.36µA
Ultra-low latency (0.15ms) wake-up from STANDBY state, I_Q = 0.8mA
Three GPI pins for triggering of up to six independent haptic sequences
On-board Waveform Memory with amplitude, time, and frequency control

Active Acceleration and Rapid Stop technology for high-fidelity haptic feedback
Actuator diagnostics and fault handling
No software requirements with embedded operation
Differential PWM output drive
Current driven system to deliver constant actuator power
Configurable EMI suppression
Automatic short circuit protection
Ultra-low power consumption, I_Q = 0.36µA, with state retention in IDLE state
Supply monitoring, reporting, and automatic output limiting
Open- and closed-loop modes
Custom wave drive support
Small solution footprint requiring only one decoupling capacitor in both WLCSP and QFN