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.