ecet_340_week_5_homework-

ecet_340_week_5_homework- - Pages 467468 problems 1 5 11 12...

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Pages 467–468, problems 1, 5, 11, 12, 35, 38, 42, 45, 54, 55 1. True or false. Sensor output is in analog. 5. True or false. An ADC with 8 channels of analog input must have 8 pins, one for each analog input. 11. Which of the following ADC sizes provides the best resolution? (a) 8-bit (b) 10-bit (c) 12-bit (d) 16-bit (e) They are all the same. 12. In Problem 11, which provides the smallest step size? 16 bit 35. With V rh = 2.56 V and V rl = Gnd, find the Vin for the following outputs:. (a) D9–D0 = 1111111111 (b) D9–D0 = 1000000001 (c) D9–D0 = 1100110000 a) D9 - D0 = 1111111111=2048 in decimal V=2048/2048 x 2.56 =2.56 V b) D9 - D0 = 1000000001=1025 in decimal V=1025/2048 x 2.56 =1.28125 V

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(c) D9 - D0 = 1100110000 =1632 in decimal V=1632/2048 x 2.56=2.04 V 38. How do we start conversion in the HCS12? This is the analog to digital module. It has an array of flexible conversion sequences. The following is the procedure on how it is started. First call ATD On for specified set of 8 inputs. Then call ATD Digital Input with appropriate bitmask to configure the pins as analog or digital. Then ATD Off function turns the corresponding 8-channel ATD converter off. After the relevant ATD converter has been turned on, any of the conversion routines can be invoked. Now start conversion using ATD Single or ATD Sample or ATD Start Sample or ATD Multiple 42. Discuss the different analog-to-digital converter (ADC) types and configurations. What is the purpose of the ADC? How do you interface to the different configurations? Analog-to-digital converter (ADC) takes in an analog input, which can either be a voltage or a current-and converts it to a digital value that can be interpreted by a microprocessor.ADCs are of various speeds, use different interfaces, and provide differing degrees of accuracy. The following are the common types.
Flash ADC The flash ADC among the available ADCs is the fastest .It uses comparators, one per voltage step, and a string of resistors.

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