Microcontroller and system for controlling trial times in a furnace system
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United States of America Patent
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-
Jun 25, 1991
Grant Date -
N/A
app pub date -
Aug 17, 1990
filing date -
Aug 17, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A microcontroller and system allowing for more than one trial time in a furnace system, while using only one pin of the microcontroller. An alternating current signal at an input port of the microcontroller causes the microcontroller to allow a first long trial time period. Any direct current signal at the input port causes the microcontroller to allow only a second shorter trial time period. The trial time input port of the microcontroller is placed between two ports which either receive or send direct current signals. Due to this arrangement of the parts and construction of the microcontroller, the microcontroller will fail to the shorter and safer trial time if a fault causes an erroneous signal to appear at the input port.
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