HDMI plug and cable assembly
A high-definition multimedia interface (HDMI) plug on an HDMI cable assembly includes an indicator light that is illuminated only when both ends of the cable are plugged into a video source and a video sink. Embodiments include an HDMI plug that comprises a connector body having a mating end configured for insertion into a mating HDMI receptacle and containing electrical pins configured according to HDMI specifications, the pins including a +5V Power pin, a Ground pin, and a Hot Plug Detect pin. The HDMI plug further comprises an indicator circuit that includes a light-emitting diode and a transistor switch in series with the light emitting-diode, wherein the light-emitting diode and transistor switch are coupled to the +5V Power pin, Ground pin, and Hot Plug Detect pin so that the light-emitting diode is activated only when both the +5V Power pin and Hot Plug Detect pin are energized.
1. A high-definition multimedia interface (HDMI) plug comprising:
a connector body having a mating end configured for insertion in a longitudinal direction into a mating HDMI receptacle and containing electrical pins configured according to HDMI specifications, the electrical pins including a +5V Power pin, a Ground pin, and a Hot Plug Detect pin; and
an indicator circuit disposed in or on the plug and comprising a light-emitting diode and a transistor switch in series with the light emitting-diode, wherein the light-emitting diode and transistor switch are coupled to the +5V Power pin, Ground pin, and Hot Plug Detect pin so that the light-emitting diode is activated only when both the +5V Power pin and Hot Plug Detect pin are energized.
2. The HDMI plug of claim 1 , wherein the electrical pins are configured according to one of the following:
specifications for Type A connectors according to the HDMI 1.0 specification;
specifications for Type B connectors according to the HDMI 1.0 specification;
specifications for Type C connectors according to the HDMI 1.3 specification; and
specifications for Type D connectors according to the HDMI 1.4 specification.
3. The HDMI plug of claim 1 , wherein the transistor switch comprises an NPN transistor having a base, emitter, and collector, and wherein the collector is coupled to the cathode of the light-emitting diode, the emitter is coupled to the Ground Pin, and the base is coupled to the Hot Plug Detect pin through a resistor.
4. A high-definition multimedia interface (HDMI) cable assembly comprising a cable and first and second HDMI plugs, each of the first and second HDMI plugs comprising:
a connector body having a mating end configured for insertion in a longitudinal direction into a mating HDMI receptacle and containing electrical pins configured according to HDMI specifications, including a +5V Power pin, a Ground pin, and a Hot Plug Detect pin; and
an indicator circuit disposed in or on the plug and comprising a light-emitting diode and a transistor switch in series with the light emitting-diode, wherein the light-emitting diode and transistor switch are coupled to the +5V Power pin, Ground pin, and Hot Plug Detect pin so that the light-emitting diode is activated only when both the +5V Power pin and Hot Plug Detect pin are energized.
5. The HDMI cable assembly of claim 4 , wherein, in each of the first and second HDMI plugs, the transistor switch comprises an NPN transistor having a base, emitter, and collector, and wherein the collector is coupled to the cathode of the light-emitting diode, the emitter is coupled to the Ground Pin, and the base is coupled to the Hot Plug Detect pin through a resistor.