Digital output MEMS pressure sensor and method
First Claim
1. A product pressure-monitoring system comprising:
- a pressure-sensing system comprising a micro-electromechanical system (MEMS) pressure-sensing element to provide a pressure-sensing output proportional to a sensed pressure; and
a voltage-to-frequency converter to provide a digital-frequency output linearly proportional to the sensed pressure; and
a microcontroller system comprising a microcontroller and an RF transmitter, the microcontroller to receive the digital-frequency output, wherein the microcontroller generates a notification signal when the sensed pressure is either inside or outside a predetermined pressure range, and the RF transmitter is to transmit an RF signal in response to the notification signal, the RF signal indicating that the sensed pressure is either inside or outside the predetermined pressure range.
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Abstract
A method and pressure-sensor system provide a digital-frequency output linearly proportional to a sensed pressure. The system comprises a MEMS pressure-sensing element to provide a pressure-sensing output and voltage-to-frequency converter provide the digital-frequency output. The pressure-sensor system may also comprise an amplifier to provide an output voltage linearly proportional to the pressure. A temperature sensor and temperature-compensation circuitry provide a temperature-compensation signal to the amplifier to at least partially offset the effects of temperature on the system. Some embodiments of the present invention comprise a microcontroller system comprising a microcontroller and an RF transmitter. The microcontroller may receive the digital-frequency output and may generate a notification signal when the sensed pressure is inside or outside a predetermined pressure range. The RF transmitter may transmit an RF signal to indicate that the sensed pressure is inside or outside the predetermined pressure range.
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Citations
8 Claims
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1. A product pressure-monitoring system comprising:
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a pressure-sensing system comprising a micro-electromechanical system (MEMS) pressure-sensing element to provide a pressure-sensing output proportional to a sensed pressure; and
a voltage-to-frequency converter to provide a digital-frequency output linearly proportional to the sensed pressure; anda microcontroller system comprising a microcontroller and an RF transmitter, the microcontroller to receive the digital-frequency output, wherein the microcontroller generates a notification signal when the sensed pressure is either inside or outside a predetermined pressure range, and the RF transmitter is to transmit an RF signal in response to the notification signal, the RF signal indicating that the sensed pressure is either inside or outside the predetermined pressure range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification