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Isolated Temperature Sensor CIRCUIT (MAX845)

2014-11-25 13:21  
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In some temperature-sensing applications there are some problems caused by the placement of sensors on location where the potential is very different from that of the data-acquisition-system common. So the operating temperature sensor must be isolated from its data-acquisition system galvanically.? And the power’s source for the sensor was isolated. This circuit is designed to solve that problem. It provides power and isolation for a temperature sensor. Here is the circuit:

Isolated Temperature Sensor jadi circuit schematic

This circuit use the MAX845 (IC1) as a power transformer driver. The power of the temperature sensor is generated by the secondary winding from transformer that feeds a Graetz bridge rectifier. This circuit uses the MAX6576 (IC2) as temperature sensor that is provides a digital output whose period encodes the temperature (10μs/°K to 640μs/°K) and isolated by transformer. The MAX6576 was chosen because it combines the temperature sensor, signal-processing electronics, and easy-to-use digital I/O interface in a single low-cost package. It draws very little current from a single supply voltage. The MAX6576 is operated in the range 3V to 5V but it can maintains its accuracy specs.

This article describes the Isolated Temperature Sensor CIRCUIT (MAX845). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:MAX845.


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