Temperature-sensor


Posted on May 12, 2012

The temperature sensor provides an input to pin 3 of the NE5037 of 32 mV/°C. This 32 mV is the value of one LSB for the NE5037. The LM334 is a three-terminal temperature sensor and provides a current of 1 p.A for each degree Kelvin. The 32-KO resistor provides the 32 mV for each microamp through it, while the transistor bleeds off 273 p.A of the temperature sensor (LM334) current. This bleeding lowers the reading by 273 K, thus converting from Kelvin to Celsius. To read temperature, conversion is started by sending a momentary low signal to pin 7 of the NE5037.


Temperature-sensor
Click here to download the full size of the above Circuit.

When pin 10 of the NE5037 becomes low, conversion is complete and a low is applied to pin 9 of the NE5037 to read data on pins 11 and through 16. Note that this temperature data is in straight binary format. The controller can be a microprocessor in a temperature controLapplication, or discrete circuitry in a simple temperature reporting application.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

13 Volt 20 Amp with current limiter
Logic test probe with memory
Light-modulator
Knock Block using an Arduino board
Stand Alone 600mA Li-ion Battery Charger
A 12 Volt Switching Power Supply
Homemade HiFi
stepper motor controller circuit and code
4 step 4017 sequencer
IR Widget
Bus Description RS644 LVDS
Pre-dividing power amplifier
Available units selected from 10 to 10dB 90dB programmable gain amplifier



Top