Wearable alert device having selectable alert volume and method of operating same

A wearable alert device, comprising:

• an audio transducer comprising a first terminal an a second terminal;
• a driver circuit disposed in the sealed volume that selectively drives the audio transducer in either a single ended mode or a double ended mode responsive to an enable signal;
• an audio driver circuit comprising:
• a first driver logic path that outputs a first drive signal to the first terminal of the audio transducer and that corresponds to an input clock signal provided to the first driver logic path;
• and
• a second driver logic path that outputs a second drive signal to the second terminal of the audio transducer and that is responsive to an enable signal to output the second drive signal as a constant output when the enable signal is in a first state and to output the second drive signal as an inverted signal that is an inverted version of the first drive signal when the enable signal is in a second state.

A method of driving an audio transducer in an alert device, comprising:

• detecting an occurrence of an alert event by the alert device;
• responsive to detecting the occurrence of the alert event, determining a drive mode for driving the audio transducer, wherein the drive mode is one of a single ended mode and a double ended mode;
• responsive to determining that the drive mode is the single ended mode, driving the audio transducer using the single ended mode;
• and
• responsive to determining that the drive mode is the double ended mode, driving the audio transducer using the double ended mode.