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university:courses:electronics:electronics-lab-window-comp-tmp01 [07 Mar 2018 13:14] – Antoniu Miclausuniversity:courses:electronics:electronics-lab-window-comp-tmp01 [03 Jan 2021 22:21] (current) – fix links Robin Getz
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 ===== Objective ===== ===== Objective =====
  
-The objective of this lab activity is to use two high speed voltage comparators as a Window-Comparator and program the [[http://www.analog.com/media/en/technical-documentation/data-sheets/TMP01.pdf|TMP01]] Low Power Programmable Temperature Controller using this approach.+The objective of this lab activity is to use two high speed voltage comparators as a Window-Comparator and program the TMP01 Low Power Programmable Temperature Controller using this approach.
  
 A Window-Comparator is a circuit configuration, usually consisting of a pair of voltage comparators (inverting and non-inverting), in which the output indicates whether an input signal is within the voltage range bounded by two different thresholds. One which triggers an op-amp comparator on detection of some upper voltage threshold, V<sub>REF(HIGH)</sub> and one which triggers an op-amp comparator on detection of a lower voltage threshold level, V<sub>REF(LOW)</sub>. The voltage levels between these two upper and lower reference voltages is called the “window”. A Window-Comparator is a circuit configuration, usually consisting of a pair of voltage comparators (inverting and non-inverting), in which the output indicates whether an input signal is within the voltage range bounded by two different thresholds. One which triggers an op-amp comparator on detection of some upper voltage threshold, V<sub>REF(HIGH)</sub> and one which triggers an op-amp comparator on detection of a lower voltage threshold level, V<sub>REF(LOW)</sub>. The voltage levels between these two upper and lower reference voltages is called the “window”.
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 ==== Procedure ==== ==== Procedure ====
  
-Use the first waveform generator (W1) as source to provide a Triangular signal with 5V amplitude, 100Hz frequency and 2.5V offset.+Use the first waveform generator (W1) as source to provide a Triangular signal with 5V amplitude peak-to-peak, 100Hz frequency and 2.5V offset.
  
 Use the second waveform generator (W2) as 5V constant reference voltage. Use the second waveform generator (W2) as 5V constant reference voltage.
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 R<sub>3</sub> (in kΩ) = V<sub>SETLOW</sub>/I<sub>VREF</sub> R<sub>3</sub> (in kΩ) = V<sub>SETLOW</sub>/I<sub>VREF</sub>
  
-The total R<sub>1<sub> + R<sub>2</sub> + R<sub>3</sub> is equal to the load resistance needed to draw the desired hysteresis current from the reference, or I<sub>VREF</sub>.+The total R<sub>1</sub> + R<sub>2</sub> + R<sub>3</sub> is equal to the load resistance needed to draw the desired hysteresis current from the reference, or I<sub>VREF</sub>. 
 + 
 +I<sub>VREF</sub> = 2.5V/( R<sub>1</sub> + R<sub>2</sub> + R<sub>3</sub>) 
 + 
 +Since VREF = 2.5 V, with a reference load resistance of 357 kΩ or greater (output current 7 μA or less), the temperature setpoint hysteresis is zero degrees. Larger values of load resistance only decrease the output current below 7 μA and have no effect on the operation of the device. The amount of hysteresis is determined by selecting a value of load resistance for VREF.  
 + 
 +==== Tasks ==== 
 + 
 +1. Build the following circuit: 
 + 
 +<WRAP centeralign>{{:university:courses:electronics:tmp01-bb1.png|}}</WRAP> 
 + 
 +<WRAP centeralign> Figure 5 Temperature Measurement </WRAP> 
 + 
 +Measure VPTAT output value and compute the actual measured temperature in degrees Kelvin and degrees Celsius. 
 + 
 +2. Build the following circuit: 
 + 
 +<WRAP centeralign>{{:university:courses:electronics:tmp01-bb2.png|}}</WRAP> 
 + 
 +<WRAP centeralign> Figure 6 Temperature Control </WRAP> 
 + 
 +2.a. Identify the components and try to draw the circuit schematic. 
 + 
 +2.b. Using the information provided by the breadboard circuit, compute the following parameters: 
 + 
 +  * I<sub>VREF</sub> 
 +  * V<sub>SETHIGH</sub> 
 +  * V<sub>SETLOW</sub> 
 +  * T<sub>SETHIGH</sub> 
 +  * T<sub>SETLOW</sub> 
 + 
 +2.c. How many degrees is the temperature setpoint hysteresis? How can you change this value? 
 + 
 +2.d. How does the circuit work? When will LED1 (red) and LED2 (blue) turn on? Explain your answer. 
 + 
 +<WRAP round download> 
 +**Lab Resources:** 
 +  * Fritzing files: [[downgit>education_tools/tree/master/m2k/fritzing/temp_ctrl_bb | temp_ctrl_bb]] 
 +  * LTspice files: [[downgit>education_tools/tree/master/m2k/fritzing/temp_ctrl_ltspice | temp_ctrl_ltspice]] 
 +</WRAP> 
 +===== Further Reading ===== 
 + 
 +Additional resources: 
 + 
 +  * [[adi>static/imported-files/data_sheets/TMP01.pdf|TMP01 Low Power Programmable Temperature Controller]] 
 +  * [[adi>library/analogdialogue/archives/42-10/testing_comparators.html|Adding Test Capability to a Window Comparator]] 
 + 
 +**Return to Lab Activity [[university:courses:electronics:labs|Table of Contents]]** 
 + 
 + 
 + 
 + 
 + 
 + 
 + 
  
-I<sub>VREF</sub> = 2.5/( R<sub>1</sub> + R<sub>2</sub> + R<sub>3</sub>) 
  
university/courses/electronics/electronics-lab-window-comp-tmp01.txt · Last modified: 03 Jan 2021 22:21 by Robin Getz

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