Sensor power management

A method comprising:

• receiving an analog signal from a sensor configured to output the analog signal in response to detecting a physical phenomenon;
• testing by a signal processing circuit the analog signal against at least one criterion;
• and
• passing for further processing by other circuitry information related to the analog signal in response to the analog signal passing the at least one criterion.

An apparatus comprising:

• a sensor configured to output an analog signal in response to detecting a physical phenomenon;
• an analog signal conditioning circuit configured to receive the analog signal and to condition the analog signal to create a conditioned analog signal;
• an analog test circuit configured to test the conditioned analog signal against a signal criterion and to pass the conditioned analog signal for further processing in response to the conditioned analog signal passing the signal criterion;
• a digital filtering circuit configured to receive the conditioned analog signal in response to the conditioned analog signal passing the signal criterion and to digitally filter the conditioned analog signal to create a digitally filtered signal;
• and
• a digital test circuit configured to test the digitally filtered signal against a digital signal criterion and to pass the digitally filtered signal for further processing in response to the digitally filtered signal passing the digital signal criterion;
• a microcontroller signal analysis circuit configured to receive the digitally filtered signal and to analyze the digitally filtered signal to create an analyzed signal;
• and
• an analyzed signal test circuit configured to test the analyzed signal against an analyzed signal criterion and to pass the analyzed signal for further processing in response to the analyzed signal passing the analyzed signal criterion;
• a power management unit circuit in communication with the analog test circuit, the digital test circuit, and the analyzed signal test circuit, the power management unit circuit configured to adjust the signal criterion, the digital signal criterion, and the analyzed signal criterion in response to a change in an electrical power supply condition for the apparatus.