Method and device for universal serial bus smart card traffic signaling
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Feb 17, 2004
Grant Date -
N/A
app pub date -
Sep 14, 2000
filing date -
Sep 14, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and device are disclosed for detecting successful transfers between a Universal Serial Bus (USB) port and a USB smart card and generating a signal that provides an indication of the USB transaction activity. This USB transaction activity signal is modulated according to the USB transaction activity and drives a Light Emitting Diode (LED) in a preferred embodiment of the invention. A counter internal to the USB smart card scales the transaction activity signal such that it is perceptible to the user. Because the current through the LED depends upon the USB transaction activity, the brightness of the LED varies according to the USB transaction activity. The LED may be driven from a current mirror sink or source, or a current switch sink or source.
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