General Description
DA7281 is a linear resonant actuator (LRA) and eccentric rotating mass (ERM) haptic driver offering automatic closed-loop LRA resonant frequency tracking. The feature guarantees consistency across LRA production tolerances, operating temperature, aging, and mechanical coupling. DA7281 offers wideband operation that fully utilizes the capabilities of newer wideband and multi-directional LRAs.

KEY FEATUREs
■ LRA or ERM drive capability
■ Automatic LRA resonant frequency tracking
■ Wideband LRA support
■ I2C and PWM input streaming
■ Low latency (0.75 ms) I2C/GPI wake-up
   from low power consumption IDLE state,
   IQ = 0.36 µA
■ Ultra-low latency (0.15 ms) wake-up from
   STANDBY state, IQ = 0.8 mA
■ GPI pin for triggering of up to two 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
■ Up to four I2C addresses via two address pins
■ 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, IQ = 0.36 µA,
   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

APPLICATIONs
■ Smartphones, wearables, and hearables
■ Computer peripherals
■ Gaming
■ Automotive and industrial
■ Virtual and augmented reality controllers