Unformatted text preview: EE 4770 Homework 2 Due: 26 February 1996 Design a circuit to measure x 2 200 K; 400 K , temperature, using a platinum
RTD with response Ht x = R01+ 1x + 2 x2, where R0 = 250 , 1 = 0:00398= C, and
2
,7
2 = ,5:83 10 = C . Convert the temperature to oatingpoint number H x = x= K,
to be written into variable tee.
The temperature written should have a precision of 0:1.
The voltage across the RTD must be 1:3 V at all temperatures.
Within x 2 200 K; 400 K , the input to the ADC must be no lower than 5 and no
higher than 95 of its maximum input voltage. Assuming the minimum input to the
ADC is 0 V, like the type described in class.
Show all component and supply values. Show pseudocode for the interface routine. Problem 1: ...
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 Fall '99
 Staff
 RTD, 400 K, minimum input, maximum input voltage, 2 200 K

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