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During HW101, we assumed the outputs of the comparators had 2 states: high (output 12V) or low (0V). This is known as an “active high” output, meaning the output will be driven my by a power supply. However, often times the outputs are “open collector” as it makes the design of the IC simpler. This type of output also has 2 states: floating (not connected to anything), or low (connected to gnd). With this type of output, a resistor is often used to “pull” the output high when the pin is floating. Otherwise, a floating pin is at an undefined state.
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In the bottom left corner, you can add a part choice. Search for the part using the supplier part number, and select the part. A prompt will appear asking if you want to auto populate part parameters from the online database. You can use this, but only for parameters matching the template (there is a toggle for this). Click the models and parameters datasheets tab, and make sure everything is unchecked. We have our own models and won’t be using those from the manufacturer part search.
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Immediately to the left of the wire icon are the port icons. You can right click to select between power and ground ports. Ground ports generally don’t need to be renamed, while power nets follow our Power Net Naming Standard. Since the battery voltage is variable, we will name it “VBAT”. Power ports should always face up and ground ports face down!
Designators
All components have a letter designator indicating the type, along with a number to act as a unique identifier. At this point the number will be a “?”, so to assign them all numbers, you can use Tools → Annotation → Annotate Schematics. Click Update Changes List, and then Accept Changes → Execute Changes. Once you close the panels the schematic should be annotated.
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