lecture12

lecture12 - FoundationsofEmbeddedSystems ATermFall2008

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Foundations of Embedded Systems A Term Fall 2008 Lecture #18: The A/D Converter (ADC12) _______________________________________________________________________ Reading for Today:  User's Guide 20 Reading for Next Class: User's Guide 20 HW #4 (on web):  Due Thursday 9/25/08 Lab #2 (on web):  Report due 8/30/2008 Last Class : More on the stop watch example and using “leap counts” to help                     maintain time accuracy >> Timer operation is autonomous.  Main code runs independently.  Only          evidence/impact of interrupts is the timer count increasing  _______________________________________________________________________ Analog-to-Digital Converter (ADC12) >> A/D converters have become ubiquitous! --> YOU will very like need to use them to complete your ECE2799 project and         you MQP!    --> But, how do they work and how do you use them properly? >>  Some ADC basics. ..
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>> Some A/D realities. .. Sample and Hold A/D >> Real-world, non-ideal circuits can lead to non-linearities in conversion results       (see “ABC's of ADC's” on class links page)
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>> 12-bit Sample and Hold ADC's (or the like) are standard equipment on small  P's like        our MSP430 -- Are they any good?   Yes and No >> Generally well suited to measuring low to moderate data rate sensors with       fixed dynamic range  -- Temperature    -- Pressure -- Accelerometers >> Probable unsuitable for higher data rate, larger dynamic range -- Most audio >> BUT, as always, it will depend on the Application! What is
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lecture12 - FoundationsofEmbeddedSystems ATermFall2008

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