Actuator drivers – Actuators
TI offers a comprehensive set of drivers that are compatible with various haptic actuator technologies. Vendors listed below offer ERM, LRA, piezo, and solenoid haptic actuators that have been tested to work with TI driver ICs.
Linear Resonant Actuators
LRAs are comprised of a simple magnet attached to a spring that modulates up and down creating its vibrations. LRAs can offer a richer user experience in a lower power solution compared to ERMs.
Linear Wideband Actuators
Unlike a typical LRA which operates at a single frequency, a wideband actuator is driven with analog waveforms to give high acceleration over a range of frequencies. This delivers a much more natural and realistic haptic experience.
Eccentric Rotating Mass
ERMs are inertial motor-based haptic actuators. This actuator has an off-center weight that rotates, creating omni-directional waves that propagate throughout the device enabling whole device haptics.
Piezo actuators bend and stretch when a voltage is applied. The voltage can be applied in a manner that rapidly cycles the piezo actuator between transformed and relaxed state which creates vibrations. Piezo actuators can also be driven to high enough frequencies to produce audible noise.
Solenoids are electromagnetic devices that convert electric energy directly into linear mechanical motion. Solenoid actuators require high current and provide the strongest haptic responses.
Actuators comparison chart
|High definition haptics||No||Yes||No||Yes||No|
|Drive voltage||2V (RMS)||2V (RMS)||2.5V-5.5V (peak)||50V-200V (peak-to-peak)||20V-50V (peak)|
|Response time||20-30 ms||<10 ms||40-80 ms||<1 ms||5-10 ms|
|Haptic driver||Browse Drivers||Browse Drivers||Browse Drivers||Browse Drivers|