By Kenneth Gatland
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The one wire CMOS output of the sensor can be connected to all kinds of microcontrollers and handle cable length up to 20 meters. This makes the SMT160-30 very useful in remote sensing and control applications. This smart temperature sensor represents a significant totally new development in the transducer technology. Its novel on-chip interface meets the progressively stringent demands of both the consumer and industrial electronics sectors for a temperature sensor directly connectable to the microprocessor input and thus capable of direct and reliable communication with microprocessors.
The pressure sensing element is a quartz beam, which changes frequency under the axial load. The transferred force acts on the quartz beam to give a controlled, repeatable, and stable change in the resonator’s natural frequency, which is measured as the transducer output. The load dependent frequency characteristic of the quartz crystal beam can be characterized by a simple mathematical model to yield highly precise measurements of the pressure and pressure related parameters. The output is a square wave frequency [44].
These limits are transmitted to the temperature sensor via the SMBus interface. If the temperature moves above or below the circumscribed range, the alert signal interrupts the processor. This digital I/O class of devices finds widespread use in servers, battery packs, and hard disk drives. Temperature is monitored in numerous locations to increase a server's reliability: at the motherboard (which is essentially the ambient temperature inside the chassis), inside the CPU die, and at other heat-generating components such as graphics accelerators and hard-disk drives.