Question

Design a signal conditioning circuit (SCC) to be
interfaced between a MCP9700/9700A and the A/D of a
microcontroller. The temperature sensor range to be measured is -5◦
to +30◦C, and the range of the A/D converter is from 0 to
5V.

Answer #1

**Answer:**

MCP9700 temperature sensor's output follows the equation

**Vout = 0.01*Temperature + 0.5 (temperature is in degree
centigrade)**

(0.01 is the temperature co-efficient of this device)

So at -5 degree, Vout = -0.01*5 + 0.5 =0.45 volt, and

at +30 degree, we have Vout = 0.01*30 + 0.5 = 0.8V

**In order to use the full ADC range of 0 to 5V, we need a
signal conditioning circuit which can map 0.45V to 0V and 0.8V to
5V. So we do the following:**

1. First subtract 0.45 from the sensor output . This gives us a range of 0V to 0.35V

2. Then we amplify the output of subtractor by factor of 5/0.35 = 14.286

This design is shown below.

Hope this helps

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