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[FAQ] DRV2624: Driving Capabilities of DRV2624 & DRV2625

Part Number: DRV2624

What types of haptic actuators can be driven by these models?

-  The DRV2624/2625 are designed to drive either an Eccentric Rotating Mass (ERM) actuator or Linear Resonant Actuator (LRA)

How powerful of an actuator can these models drive?

-  The DRV2624/2625 are rated for a supply voltage between 2.7 – 5.5 V, so it would not be optimal to be drive any ERM or LRA with a rated voltage of more than 5.5V with these chips.

-  The minimum load impedance is 8 ohms, so driving at a max voltage of 5.5V and a load impedance of less than 8 ohms would strain the output capability of the DRV.

Can these models accommodate actuators of any resonant frequency?

-  No the LRA frequency range for these designs is from 45 – 300 Hz

-  ERM actuators do not have a resonant frequency

Do these models provide support for driving more than one actuator at a time?

-  The algorithms within the chips that manage the auto-calibration, resonance tracking, over-drive, and auto-braking are based on only having to manage one actuator attached to the output and will fail if feedback from the output is composed of back-EMFs of two different actuators.