Digital input circuit
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United States of America Patent
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Issued Date -
May 19, 2011
app pub date -
Nov 18, 2010
filing date -
Nov 18, 2009
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A digital input circuit includes a pair of input terminals that an input signal of a digital voltage signal is inputted; a photocoupler for transmitting the input signal from the input terminals to an input port of a microcomputer and having one light emitting diode and one phototransistor, wherein the light emitting diode of the photocoupler is connected between the input terminals, a collector of the phototransistor is connected to a positive side of a power supply, and an emitter of the phototransistor is connected to ground via a first resistor; and a bipolar transistor provided between the ground and a second resistor, wherein a collector thereof is connected to the second resistor for pulling up the input port of the microcomputer, an emitter thereof is connected to the ground, and a base thereof is connected to a connection node between the emitter of the phototransistor and the first resistor.
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