My team is being asked to find out why a circuit is failing for no obvious reason. The circuit has a piezo buzzer (CEP2242 from CUI, Inc). The buzzer is driven by a MCU driven FET that completes a circuit like this: high side power 3.3V -> buzzer -> FET -> ground (BSS123LT1 FET on the low side).
Does anybody have any experience with the possibility of a piezo buzzer generating damaging voltage spikes when dropped? We have no protection diodes on this part of the circuit.
At this stage, we have no information of exactly what's failing. We do have evidence that some failed units have been dropped. I'm following through on a hypothetical failure path which we need to either consider further or discard.
Thanks - JJS