mt - Name Real Time Computing Systems EE 4770 Midterm...

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Name Real Time Computing Systems EE 4770 Midterm Examination 17 March 1999, 8:40-9:30 CST (Real Time Computing Systems Midterm Examination) Alias Problem 1 (50 pts) Problem 2 (50 pts) Exam Total (100 pts) Good Luck!
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Problem 1: The partially designed circuit below is to be used to convert temperature x [ - 20 C , 40 C] to a floating-point number H ( x )= x/ K to be written into variable temp . The circuit uses an RTD, its model function is H t1 ( x )= R 0 (1+ α 1 x ), where R 0 = 100 Ω and α 1 =0 . 00398 / C. The RTD is connected to a - 7V source as shown. The ADC response is H ADC(10V , 16b) . + - v 1 v 2 R 2 R 3 -7 V ADC B I RTD ( a ) Complete the design (choose values for v 2 , R 2 and R 3 ), so that the ADC input is in [0 . 5V , 9 . 5V] over the range of temperatures to be measured. (20 pts)(For reduced credit [ < 20 pts] make full use of the ADC dynamic range.) 2
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( b ) Write the interface routine. (20 pts) double v1 = -7.0; /* Volts */ double v2 = /* No need to copy in values from previous page. */ double R2 =
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mt - Name Real Time Computing Systems EE 4770 Midterm...

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