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university:courses:electronics:electronics-lab-window-comp-tmp01 [09 Mar 2018 10:43] – add first TMP01 task Antoniu Miclausuniversity:courses:electronics:electronics-lab-window-comp-tmp01 [09 Mar 2018 14:12] – add task 2 + further reading Antoniu Miclaus
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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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 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> = 2.5/( R<sub>1</sub> + R<sub>2</sub> + R<sub>3</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.  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. 
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 Measure VPTAT output value and compute the actual measured temperature in degrees Kelvin and degrees Celsius. Measure VPTAT output value and compute the actual measured temperature in degrees Kelvin and degrees Celsius.
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 +2. Build the following circuit:
 +
 +<WRAP centeralign>{{:university:courses:electronics:tmp01-bb2.png|}}</WRAP>
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 +<WRAP centeralign> Figure 6 Temperature Control </WRAP>
 +
 +2.a. Identify the components and try to draw the circuit schematic.
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 +2.b. Using the information provided in 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?
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 +2.d. How does the circuit work? When will LED1 (red) and LED2 (blue) turn on? Explain your answer.
 +
 +===== Further Reading =====
 +
 +Additional resources:
 +
 +  * [[http://www.analog.com/static/imported-files/data_sheets/TMP01.pdf|TMP01 Low Power Programmable Temperature Controller]]
 +  * [[http://www.analog.com/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]]**
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university/courses/electronics/electronics-lab-window-comp-tmp01.txt · Last modified: 03 Jan 2021 22:21 by Robin Getz

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