ECE-567-05 - Week 5 Week Lab 3 ADC Interfacing Creating...

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Week 5 Week 5
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SU 2005 EE ECE 567 Microprocessor Labs 2 4 - Lab 3 ADC Interfacing Lab 3 ADC Interfacing Creating your very own Digital Thermometer 1. Read temperature data using A/D 2. Average over many samples 3. Convert to temperature in degrees Fahrenheit 4. Display temperature in BCD
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SU 2005 EE ECE 567 Microprocessor Labs 3 4 - Hardware Components Used Hardware Components Used LM 34 Temperature Sensor Converts ambient temperature to analog voltage LM385z -1.2v 1.2 Volt fixed reference Operates in the reverse biased region
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SU 2005 EE ECE 567 Microprocessor Labs 4 4 - Lab 3 Block Schematic Lab 3 Block Schematic Temp Sensor ADC Result Register Input = Temperature (F) Analog Voltage Output = Digital 8bit Number 0- 255 (N) Hardware components used: LM 34 Temperature sensor Convert ambient temperature to analog voltage LM385z – 1.2v Zener diode 1.2 volt fixed reference Operates in the reverse biased region
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SU 2005 EE ECE 567 Microprocessor Labs 5 4 - 68HC11 ADC Register’s 68HC11 ADC Register’s OPTION REGISTER ($1039) (Write $90) A/D Power On bit, ADPU ADCTL REGISTER ($1030) (Write $01) Control and Status Register Bits 0,1,2,3 for Channel Selection, %0001 = PE1/ADR2 CCF: Conversion Complete Flag, set to 1 after 4 th conv.
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