DA7282 LRA/ERM Ultra-Low Power Haptic Driver with Multiple Input Triggers and Integrated Waveform Memory General Description DA7282 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. DA7282 offers wideband operation that fully utilizes the capabilities of newer wideband and multi-directional LRAs. The differential output drive architecture and continuous actuator motion sensing enable efficient, calibration-free playback and minimize software complexity. Featuring wake-up on General Purpose 2 Input (GPI) sequence triggers and/or I C activity, DA7282 automatically returns to a low quiescent current state (typically 0.68 A) between playbacks. In OFF mode the device consumes only 5 nA making it suitable for low power applications. To reduce system complexity, an integrated Waveform Memory allows haptic sequences to be pre- loaded to DA7282. Independent sequences can be triggered, with low-latency (0.75 ms), by up to three separate input pins without host interaction. Haptic sequences can also be streamed to 2 DA7282 from an external source via I C or pulse width modulated (PWM) signals. DA7282 actively monitors the back electromotive force (BEMF) while continuously driving and applies closed-loop Active Acceleration and Rapid Stopping for sharper clicks and a higher fidelity user experience. This offers significant advantages over existing solutions that need to move into a high-impedance state during drive to measure the BEMF, which adds a considerable amount of inactive time to the sequence and lowers the effective click strength for a given LRA. Key Features No software requirements with embedded LRA or ERM drive capability operation Automatic LRA resonant frequency tracking Differential PWM output drive Wideband LRA support Current driven system to deliver constant 2 I C and PWM input streaming actuator power 2 Low latency (0.75 ms) I C/GPI wake-up from Automatic short circuit protection low power consumption IDLE state, I = 0.68 A Ultra-low power consumption, I = 5 nA, when Q Q device is disabled Ultra-low latency (0.15 ms) wake-up from STANDBY state, I = 0.8 mA Ultra-low power consumption, I = 0.68 A, Q Q with state retention in IDLE state Three GPI pins for triggering of up to six independent haptic sequences Supply monitoring, reporting, and automatic output limiting On-board Waveform Memory with amplitude, time, and frequency control Open- and closed-loop modes Active Acceleration and Rapid Stop Custom wave drive support technology for high-fidelity haptic feedback Small solution footprint requiring only one Actuator diagnostics and fault handling decoupling capacitor in both WLCSP and QFN VDDIO/EN VDD Configurable EMI suppression Over- SCL Battery 2 I C References Temperature Monitor SDA Protection Applications nIRQ BEMF Sensing and Resonant Actuator Diagnostics Smartphones, wearables, and hearables Frequency OUTP Tracking, Computer peripherals ERC Driver Active GPI 0/ Acceleration, Gaming Short Circuit LRA/ PWM Rapid Stop, Protection ERM and Automotive and industrial GPI 1 Waveform ERC Driver Memory Virtual and augmented reality controllers OUTN GPI 2 DA7282 Disposable consumer products GND Datasheet Revision 3.0 30-Jul-2019 CFR0011-120-00 1 of 77 2019 Dialog Semiconductor Regulation Loop DA7282 LRA/ERM Ultra-Low Power Haptic Driver with Multiple Input Triggers and Integrated Waveform Memory System Diagrams System System VBAT VBAT VDDIO VDDIO VDD VDD OUTP OUTP VDDIO/EN VDDIO/EN SDA SDA SCL SCL nIRQ nIRQ LRA/ LRA/ Host Host DA7282 ERM DA7282 ERM GPI 0/PWM GPI 0/PWM GPI 1 OUTN GPI 1 OUTN GPI 2 GPI 2 GND GND 2 2 GPI and I C I C Only System System VBAT VBAT VDDIO VDDIO VDD VDD OUTP OUTP VDDIO/EN VDDIO/EN SDA SDA SCL SCL nIRQ nIRQ LRA/ LRA/ Host Host DA7282 ERM DA7282 ERM GPI 0/PWM GPI 0/PWM GPI 1 OUTN GPI 1 OUTN GPI 2 GPI 2 GND GND PWM Only Embedded Operation VBAT External Boost VBST up to 5.5V System System VBAT VDDIO VDDIO VDD VDD OUTP OUTP VDDIO/EN VDDIO/EN Host SDA SDA (startup SCL SCL only) nIRQ nIRQ LRA/ LRA/ Host DA7282 ERM Sensor DA7282 ERM Hub or Button GPI 0/PWM GPI 0/PWM Press GPI 1 OUTN GPI 1 OUTN Detect GPI 2 GPI 2 GND GND Embedded Operation External Boost No Host Operation Figure 1: System Diagrams Datasheet Revision 3.0 30-Jul-2019 CFR0011-120-00 2 of 77 2019 Dialog Semiconductor