For a switch that is used to connect a circuit to ground, a pull-up resistor (connected between the circuit and V CC) ensures a well-defined voltage (i.e. logical low) across the remainder of the circuit when the switch is open. Closing the switch creates a direct connection to ground or V CC, but when the switch is open, the rest of the circuit would be left floating (i.e., it would have an indeterminate voltage).įor a switch that is used to connect a circuit to V CC (e.g., if the switch or button is used to transmit a "high" signal), a pull-down resistor connected between the circuit and ground ensures a well-defined ground voltage (i.e. It is typically used in combination with components such as switches and transistors, which physically interrupt the connection of subsequent components to ground or to V CC. In electronic logic circuits, a pull-up resistor ( PU) or pull-down resistor ( PD) is a resistor used to ensure a known state for a signal. When the switch is closed, the input voltage at the gate goes to ground. When the switch is open the voltage of the gate input is pulled up to the level of Vin.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |