不管是单片机的IO口，还是一般的上拉下拉电路，都会有灌电流和拉电流的身影。 了解可以帮助我们更好地理解和设计电路。 灌电流 ，英文sink current，指被动输入电流，是从输出口流入电流，下图，当PTB0输出低的时候，LED亮，电流的方向就是从VCC流进PTB0管脚。

If you got your start in electronics sometime after 1980 your first project might well have been to light up an LED. Microcontroller projects often light up an LED, too, and a blinking LED is ...

You can improve a current sink’s accuracy by at least two orders of magnitude by adding two standard 1%-tolerance resistors. As a bonus, you also compensate for ...

The 4-20 mA transmitters used in industrial current-control loops can be implemented as powered current sources, remote non-powered current sinks, or with several other I/O combinations. A useful ...

It isn’t unusual to expect a precisely regulated voltage in an electronic project, but what about times when you need a precise current? Over on EDN, prolific [Stephen Woodward] explains how to use a ...

The thyristor or silicon-controlled rectifier (SCR) provides a convenient latching mechanism for switching power to a load. However, once the thyristor is triggered into conduction, it supplies no ...

Semtech Corp. announced the industry's first smart current sink LED backlighting platform with on-chip digital lighting effects for high-end handheld displays. This new platform incorporates Semtech's ...

Semtech has announced what it claims to be the industry's first smart current sink LED backlighting platform. The new platform has on chip digital lighting effects for high end handheld displays and ...