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US 9,854,360 B2Granted
MEMS microphone and method of operating a MEMS microphone
AssigneeTDK Corporation
InventorFabrizio Conso
Life of this patent
Estimating the term…
Abstract
A MEMS microphone which is able to be set to different modes of operation is proposed that requires one single pin to apply an external clock frequency to the microphone. The applied clock frequency is selected according to a desired mode of operation and the microphone detects the applied frequency and sets the mode of operation.
Claims15
A MEMS microphone, comprising
- an input pin for applying an external reference clock signal
- a digital frequency detector for detecting the frequency of the applied external reference clock signal
- an internal memory for storing a number of frequency thresholds and a number of mode setting signals each being assigned to one the frequency thresholds
- an evaluation circuit adapted for comparing the detected frequency with the stored frequency thresholds and for selecting the respective mode setting signals according to the detected frequency threshold
- an adjustment circuit for adjusting the operation of the microphone according to the mode setting signals.
2 more elements
A method of operating a MEMS microphone,
- the method comprising the steps
- providing a MEMS microphone comprising an internal memory to store different sets of mode setting data each set being assigned to a frequency threshold
- applying an external clock signal to an input pin of the MEMS microphone
- detecting the applied frequency within the MEMS microphone
- assigning the detected frequency to a threshold stored within an internal memory of the microphone
- operating the MEMS microphone thereby using the mode setting data assigned to the frequency threshold to adjust at least an operating parameter according to a desired operation mode
- wherein the operation mode is set by selecting an according external frequency of the external clock and applying an according external clock signal to the input pin.
4 more elements
Dependencies are inferred from the claim text.