ADC and Sensor Programming

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Presentation transcript:

ADC and Sensor Programming Chapter 7 ADC and Sensor Programming

Microcontroller Connection to Sensor via ADC

An 8-bit ADC Block Diagram

Resolution versus Step Size for ADC (Vref = 5V) n-bit Number of steps Step size 8 256 5V /256 = 19.53 mV 10 1024 5V /1024 = 4.88 mV 12 4096 5V /4096 = 1.2 mV 16 65,536 5V /65,536 = 0.076 mV Note: Vref = 5V

Vref Relation to Vin Range for an 8-bit ADC Vref (V) Vin in Range (V) Step Size (mV) 5.00 0 to 5 5 / 256 = 19.53 4.00 0 to 4 4 / 256 = 15.62 3.00 0 to 3 3 / 256 = 11.71 2.56 0 to 2.56 2.56 / 256 = 10 2.00 0 to 2 2 / 256 = 7.81 1.28 0 to 1.28 1.28 / 256 = 5 1.00 0 to 1 1 / 256 = 3.90 Note: In an 8-bit ADC, step size is Vref/256

Vref Relation to Vin Range for an 10-bit ADC Vref (V) VinRange (V) Step Size (mV) 5.00 0 to 5 5 / 1024 = 4.88 4.96 0 to 4.096 4.096 / 1024 = 4 3.00 0 to 3 3 / 1024 = 2.93 2.56 0 to 2.56 2.56 / 1024 = 2.5 2.00 0 to 2 2 / 1024 = 2 1.28 0 to 1.28 1.28 / 1024 = 1.25 1.024 0 to 1.024 1.024 / 1024 = 1 Note: In a 10-bit ADC, step size is Vref/1024

A Simultaneous 2-bit ADC

ADC0848 Parallel ADC Block Diagram

MAX1112 Serial ADC Block Diagram

Successive Approximation ADC

Potentiometer Connection in EduPad

Thermistor Resistance vs. Temperature Temperature ('C) Tf (K ohms) 29.490 25 10.000 50 3.893 75 1.700 100 0.817

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Thermistor (Copied from http://www.maximintegrated.com)

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