This fire sensor circuit exploits the temperature sensing property of an ordinary signal diode IN 34 to detect heat from fire. At the moment it senses heat, a loud alarm simulating that of Fire ...

Results My first conclusion is that the simplest method of all, a diode and a 10 kΩ resistor fed into an ADC, is sufficient for non-precise work across any reasonable temperature range.

Sensing using a micro-device at high temperature is a critical problem as a Si readout circuit does not work at high temperature, even if a sensor itself is heat-resistive. We for the first time ...

Figure 2. Temperature sensor circuit based on ∆V BE Courtesy of Texas Instruments Note that in Figure 1, Q2 has the larger emitter area, but in Figure 2, Q1 has the larger area.

The slope of the dependence is related to the bias current value, and can be positive, negative or zero. Hence, the diode-connected transistor can be used as a controllable temperature sensor. This ...

Texas Instruments has announced an integrated +/-1C maximum remote junction temperature sensor and local temperature sensor, designed to monitor thermal diodes found in CPUs, microprocessors, graphics ...

For reduced power, the sensor can be put into sleep mode, reducing consumption to 10 µA. In a MSOP-8 package, price is $1.75 each/1,000. TEXAS INSTRUMENTS INC., Dallas, TX. (800) 477-8924.