Signalling between independently powered electrical circuit cards
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United States of America Patent
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-
Jan 8, 2002
Grant Date -
N/A
app pub date -
Nov 2, 1998
filing date -
Dec 16, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A plurality of circuit cards include at least a first card having a first internal power rail, an earth connection, respective operating circuits powered from the first power rail, external terminals coupled to its operating circuit, and a first external connection. A second of the plural cards has a second internal power rail, an earth connection, respective operating circuits powered from the second power rail, external terminals coupled to its operating circuit, and a second external connector. The first card includes a bipolar transistor with an emitter-base junction forwardly biased in response to normal voltage between the first power rail and the earth connection and a collector connected to the first external connector. The second card includes a resistive connection between its second internal power rail and the second external connector and circuits responsive to changes in voltage level at the second connector.
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