Pad group of pull-up/pull-down resistors, and PCB

Abstract

The invention discloses a pad group of pull-up / pull-down resistors, comprising: a first pad which is used for welding a power source pin and also used for welding a first end of a pull-up resistor when signal pull-up needs to be performed; a second pad which is used for welding a ground pin and also used for welding a first end of a pull-down resistor when signal pull-down needs to be performed; and a third pad which is used for welding a signal output pin and also used for welding a second end of the pull-up resistor when signal pull-up needs to be performed and welding a second end of the pull-down resistor when signal pull-down needs to be performed. In comparison with the prior art in which there are two pads used for welding the signal output pin, the pad group of the invention only needs one third pad, the area of a PCB (Printed Circuit Board) occupied by the pad group of the pull-up / pull-down resistors is directly reduced by decrease of the number of the pads, thereby reducing cost, and reducing wiring difficulty and layout difficulty of other components on the PCB. The invention also discloses a PCB which has the same beneficial effects with the pad group.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a pad group of pull-up and pull-down resistors, and also relates to a printed circuit board. Background technique [0002] In daily life, you can often come into contact with various processors. When processing certain signals output by the processor, you need to pull up or pull down these signals. The function of pull-up is to pass uncertain signals through The pull-up resistor is embedded in the high level, and the pull-up resistor acts as a current limiter at the same time. The pull-down is to ground the signal through the pull-down resistor, which is generally used to protect the signal. In the prior art, there are devices on the printed circuit board for connecting The pad group of the pull-down resistor includes four pads, two of which are used to solder the signal output pins of the processor, and the other two pads are used to solder the power pin and the ground pin respe...

AI Technical Summary

Problems solved by technology

[0002] In daily life, you can often come into contact with various processors. When processing certain signals output by the processor, you need to pull up or pull down these signals. The function of pull-up is to pass uncertain signals through The pull-up resistor is embedded in the high level, and the pull-up resistor acts as a current limiter at the same time. The pull-down is to ground the signal through the pull-down resistor, which is generally used to protect the signal. In the prior art, there are devices on the printed circuit board for connecting The pad group of the pull-down resistor includes four pads, two of which are used to solder the signal output pins of the processor, and the other two pads are used to solder the power pin and the ground pin respectively. When pulling up, solder the two ends of the pull-up resistor to the pad of the power supply pin and the pad of one of the signal output pins. When the signal needs to be pulled down, connect the two ends of the pull-down resistor to the pad of the ground pin. The welding pad and the pad of another signal output pin are welded, and the two pads used for welding the signal output pin of the processor in the prior art take up too much area of ​​the printed circuit board, which increases the cost and increases Reduces the difficulty of wiring in printed circuit boards and the layout of other components

Images