MEMS-based sensor for an aerosol delivery device
An aerosol delivery device is provided that includes a housing, microelectromechanical systems-based (MEMS-based) sensor and microprocessor. The MEMS-based sensor is within the housing and configured to detect a pressure on the MEMS-based sensor caused by airflow through at least a portion of the housing. The MEMS-based sensor is configured to convert the pressure to an electrical signal, and output the electrical signal. The microprocessor is configured to receive the electrical signal from the MEMS-based sensor, and control operation of at least one functional element of the aerosol delivery device based thereon.
1. An aerosol delivery device comprising:
a housing;
a microelectromechanical systems-based (MEMS-based) sensor within the housing and configured to detect a pressure on the MEMS-based sensor caused by airflow through at least a portion of the housing, the MEMS-based sensor being configured to convert the pressure to an electrical signal, and output the electrical signal; and
a microprocessor configured to receive the electrical signal from the MEMS-based sensor, and control operation of at least one functional element of the aerosol delivery device based thereon,
wherein the MEMS-based sensor is a MEMS microphone including a die with a micromachined, pressure-sensitive diaphragm and a backplate that form a variable capacitor, the die being packaged in an integrated circuit package excluding additional circuitry designed and operable to process audio, and
wherein in an instance in which an input voltage is applied to the variable capacitor, the pressure causes movement of the diaphragm and thereby a change in a capacitance of the variable capacitor, the change in the capacitance causing a change in an output voltage across the variable capacitor, the output voltage or a digital representation thereof being output by the MEMS pressure sensor as the electrical signal.
2. The aerosol delivery device of claim 1 , wherein the MEMS-based sensor being configured to convert the pressure includes being configured to convert the pressure to the electrical signal that varies with a corresponding variation in the pressure relative to an ambient pressure on the MEMS-based sensor, the corresponding variation being caused by variation in the airflow.
3. The aerosol delivery device of claim 2 , wherein the corresponding variation in the pressure is caused by variation in a rate of the airflow.
4. The aerosol delivery device of claim 1 , wherein the MEMS microphone further comprises another die that is wire bonded to the die and packaged in the integrated circuit package, and includes a bias generator circuit configured to bias the variable capacitor with the input voltage.
5. The aerosol delivery device of claim 1 , wherein the microprocessor being configured to control the operation of at least one functional element includes being configured to control the operation of a heater, fluid-delivery member, sensory-feedback member or any combination thereof.
6. The aerosol delivery device of claim 1 , wherein the die is packaged in the integrated circuit package excluding the additional circuitry designed and operable to capture and replicate audio.
7. The aerosol delivery device of claim 1 , wherein the die is packaged in the integrated circuit package excluding the additional circuitry including a filtering stage.
8. The aerosol delivery device of claim 1 , wherein the die is packaged in the integrated circuit package excluding the additional circuitry including an amplification stage.
9. The aerosol delivery device of claim 3 , wherein the microprocessor being configured to control the operation of at least one functional element includes being configured to control the operation of a heater, including the microprocessor being configured to direct current flow to the heater that varies with the variation in the rate of the airflow.