温度传感器毕业论文中英文资料外文翻译文献(6)

Figure 6. ICs that signal when a temperature has been exceeded are well suited for

over/undertemperature alarms and simple on/off fan control.

When an actual temperature reading is needed, and a microcontroller is available, sensors that transmit the reading on a single line can be useful. With the microcontroller's internal counter measuring time, the signals from this type of temperature sensor are readily transformed to a measure of temperature. The sensor in Figure 7 outputs a square wave whose frequency is proportional to the ambient temperature in Kelvin. The device in Figure 8 is similar, but the

period of the square wave is proportional to the ambient temperature in kelvins.

Figure 7. A temperature sensor that transmits a square wave whose frequency is proportional to the measured temperature in Kelvin forms part of a heater controller circuit.