A laptop microprocessor is to have a circuit built into it which will sound an alarm for low power and also control a CPU fan for high temperature. The inputs and outputs for this circuit are described in the table below.

Your task is to design the combinational logic circuit that will operate as described in the truth table above. Use three switches for the inputs and two LEDs for the outputs. The first question for this part of the lab is: Write out the equation for the alarm output with respect to the inputs and simplify the equation as needed. The following shows how to do this:

We wish to write an equation for the alarm. Note from the truth table above that the alarm turns on only when the cord is not plugged in and the voltage is low (it does not matter what the Temp is). Our equation looks like: Alarm = (low voltage) AND (cord not plugged in) Inserting the actual inputs into the alarm equation gives us Alarm = (Low Voltage) AND (NOT (Cord)) We can simplify this equation by using the following equalities. C = Cord V = Low Voltage T = Temperature Alarm = C' V The equation for the alarm was derived above by inspecting the truth table and describing the alarm output in terms of what was seen in the truth table. Typically, the equation would be derived by writing a Boolean equation from the truth table and simplifying the equation, like: Alarm = C' V T + C' V T Using: XY + XY = X Alarm = C' V

Question 1 (3 points)

Question 1 options:

Write out the equation for the alarm output with respect to the inputs and simplify the equation as needed.

Use lower case for each instance of a complemented variable. Use capital letters for the non-complemented instance of a variable. For example: AB'C'D becomes: AbcD Also, use + for the OR operation. Example: A + B Don't use a symbol for the AND operation. Example: AB

Alarm =

Outbuts Inputs Low Volta Power Cord Temperature Alarm Fan ot plugged in not low volta 0 Cord n 1cord plugged in not high temp alarm not on fan not on low volta high tenm ure alarm is on fan is orn The exact opcration is defined in the following truth table Inputs Outputs Cord 0 0 0 0 Temp Alarm Fan Voltage 0 0 0 0 0 0