ADC, DAC, and Sensor Interfacing

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Presentation transcript:

ADC, DAC, and Sensor Interfacing Chapter 7 ADC, DAC, and Sensor Interfacing

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

Simplified Block Diagram of a TI ADC Module

ADC Run Mode Clock Gating Control (RCGCADC)

Samples and FIFO Depth of Sequencers Number of Samples Depth of FIFO SS0 8 SS1 4 SS2 SS3 1

ADC Active Sample Sequencer (ADCACTSS)

ADC Event Multiplexer Select (ADCEMUX)

ADC Processor Sample Sequence Initiate (ADCPSSI)

Analog input pin assignment in TI Tiva TMC123GH6PM Pin Name Description Pin Pin Number AIN0 ADC input 0 PE3 6 AIN1 ADC input 1 PE2 7 AIN2 ADC input 2 PE1 8 AIN3 ADC input 3 PE0 9 AIN4 ADC input 4 PD3 64 AIN5 ADC input 5 PD2 63 AIN6 ADC input 6 PD1 62 AIN7 ADC input 7 PD0 61 AIN8 ADC input 8 PE5 60 AIN9 ADC input 9 PE4 59 AIN10 ADC input 10 PB4 58 AIN11 ADC input 11 PB5 57

ADC Sample Sequence Input Multiplexer Select 3 (ADCSSMUX3)

ADC Raw Interrupt Status (ADCRIS)

ADC Sample Sequence Result FIFO 3 (ADCSSFIFO3)

ADC Interrupt Status and Clear (ADCISC)

ADC channel pairing for differential Differential Pair Analog Inputs 0 and 1 1 2 and 3 2 4 and 5 3 6 and 7 4 8 and 9 5 10 and 11

ADC Sample Sequence Control 3 (ADCSSCTL3)

ADC Interrupt Mask (ADCIM)

ADC channel pairing for differential Pin AIN0 PE3 AIN1 PE2 AIN2 PE1 AIN3 PE0 AIN4 PD3 AIN5 PD2 AIN6 PD1 AIN7 PD0 AIN8 PE5 AIN9 PE4 AIN10 PB4 AIN11 PB5

ADC Connection for Program 7-1

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

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

LM34 and LM35

Getting Data to the CPU

LM34/35 Connection to ARM and Its Pin Configuration

DAC Block Diagram

Microcontroller Connection to DAC0808

Saw Tooth Wave Form

Angle vs. Voltage Magnitude for Sine Wave (degrees) Sin Ɵ VOUT (Voltage Magnitude) 5V + (5V × sin Ɵ) Values Sent to DAC (decimal) (Voltage Mag. × 25.6) 5 128 30 0.5 7.5 192 60 0.866 9.33 238 90 1.0 10 255 120 150 180 210 -0.5 2.5 64 240 -0.866 0.669 17 270 -1.0 300 330 360

Angle vs. Voltage Magnitude for Sine Wave