Time-of-day clock having a temperature compensated low power frequency source
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United States of America Patent
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May 15, 1984
Grant Date -
N/A
app pub date -
Jan 17, 1983
filing date -
Jan 17, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electronic time-of-day clock having a low-power time source and compensation circuits selectively operable responsive to pulses output from the low-power time source when system primary power is off or disabled, and responsive to a relatively highly accurate time-pulse generator when primary power is enabled. The time-of-day clock compensates continuously in real-time for errors in the output of the low-power time source caused by variations in the ambient temperature of the device; when primary power is enabled, the output of the low-power time source is further compensated by comparing the output thereof with the output of the high-accuracy frequency standard and storing accumulated error.
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