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[FAQ] DRV2625: Waveform Recording Set-Up

Part Number: DRV2625
Other Parts Discussed in Thread: DRV2624, DRV-ACC16-EVM

Achieving the right recording set-up is crucial in understanding the haptic effects produced by our haptic driver chip

Here are a few things to keep in mind when putting together the set-up

-       Need some sort of representative mass to stick your LRA or ERM to

-       The actuator being driven should be stuck in place, not able to rattle around at all

-       Each LRA being tested has to be on a different representative mass otherwise they would dampen each other’s vibrations

-       The pins to record from the DRV2624/25 EVM are these

-       To record the acceleration waveforms like in datasheet you need DRV-ACC16-EVM

-       DRV-ACC-16 has sensor to stick to mass to record acceleration waveform of vibration

-       There are three different acceleration pins to measure from on the DRV-ACC16 tool, should use Z axis pin if sticking onto mass like in picture at bottom unless you are using LRA oriented in Y or X axis

-       If not using EVM need to recreate proper output filter here

-       Use larger time division on oscilloscope to get waveform capture and then zoom in to avoid detecting too much of the remaining PWM switching frequency noise

-       Should have some sort of isolating material between mass and rest of environment

-       If you use EVM it has already attach representative mass

An example set-up of how an LRA should be recorded from using the DRV-ACC16 Accelerometer tool