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Download Electronics Switches Terry Sturtevant April 6, 2011
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Transcript
Switches Electronics Switches Terry Sturtevant Wilfrid Laurier University April 6, 2011 Terry Sturtevant Electronics Switches Switches Introduction Terry Sturtevant Electronics Switches Switches Introduction Switches are either “open” or “closed”. Terry Sturtevant Electronics Switches Switches Introduction Switches are either “open” or “closed”. Terry Sturtevant Electronics Switches Switches Introduction Switches are either “open” or “closed”. Terry Sturtevant Electronics Switches Switches When the switch is closed, the two sides of the switch are connected. Terry Sturtevant Electronics Switches Switches When the switch is closed, the two sides of the switch are connected. Terry Sturtevant Electronics Switches Switches When the switch is closed, the two sides of the switch are connected. in Terry Sturtevant Electronics Switches Switches When the switch is closed, the two sides of the switch are connected. in in Terry Sturtevant Electronics Switches Switches When the switch is open, the two sides of the switch are not connected. Terry Sturtevant Electronics Switches Switches When the switch is open, the two sides of the switch are not connected. Terry Sturtevant Electronics Switches Switches When the switch is open, the two sides of the switch are not connected. in Terry Sturtevant Electronics Switches Switches When the switch is open, the two sides of the switch are not connected. in ? Terry Sturtevant Electronics Switches Switches When the switch is open, the two sides of the switch are not connected. in ? In a logic circuit, you usually want a switch to connect you to one of two things; VCC or ground. Terry Sturtevant Electronics Switches Switches When the switch is open, the two sides of the switch are not connected. in ? In a logic circuit, you usually want a switch to connect you to one of two things; VCC or ground. AN UNCONNECTED INPUT IS NOT AUTOMATICALLY GROUNDED!!!! Terry Sturtevant Electronics Switches Switches To get around this problem, a resistor is used with a switch so that when the switch is open its output is either pulled down to ground or pulled up to VCC . Terry Sturtevant Electronics Switches Switches To get around this problem, a resistor is used with a switch so that when the switch is open its output is either pulled down to ground or pulled up to VCC . These two situations are known as active high and active low respectively. Terry Sturtevant Electronics Switches Switches To get around this problem, a resistor is used with a switch so that when the switch is open its output is either pulled down to ground or pulled up to VCC . These two situations are known as active high and active low respectively. Active high means that when the switch is closed, its output is high. Terry Sturtevant Electronics Switches Switches To get around this problem, a resistor is used with a switch so that when the switch is open its output is either pulled down to ground or pulled up to VCC . These two situations are known as active high and active low respectively. Active high means that when the switch is closed, its output is high. Active low means that when the switch is closed, its output is low. Terry Sturtevant Electronics Switches Switches The “normal” configuration for a switch is active high. Terry Sturtevant Electronics Switches Switches The “normal” configuration for a switch is active high. Terry Sturtevant Electronics Switches Switches The “normal” configuration for a switch is active high. This is a pulldown resistor. Terry Sturtevant Electronics Switches Switches The “normal” configuration for a switch is active high. This is a pulldown resistor. When the switch is open, the resistor pulls the output down to ground. Terry Sturtevant Electronics Switches Switches The “normal” configuration for a switch is active high. This is a pulldown resistor. When the switch is closed, the switch connects the output to VCC . Terry Sturtevant Electronics Switches Switches You can reverse the switch and resistor positions for the active low configuration. Terry Sturtevant Electronics Switches Switches You can reverse the switch and resistor positions for the active low configuration. Terry Sturtevant Electronics Switches Switches You can reverse the switch and resistor positions for the active low configuration. This is a pullup resistor. Terry Sturtevant Electronics Switches Switches You can reverse the switch and resistor positions for the active low configuration. This is a pullup resistor. When the switch is open, the resistor pulls the output up to VCC . Terry Sturtevant Electronics Switches Switches You can reverse the switch and resistor positions for the active low configuration. This is a pullup resistor. When the switch is closed, the switch grounds the output. Terry Sturtevant Electronics Switches
