Temperature compensated real-time clock

Abstract

The invention describes temperature compensated real-time clock systems and methods. The method can include: measuring a temperature with a temperature sensor; detecting a temperature dependent frequency from an oscillator; inputting the temperature and determining a temperature estimate for the oscillator with an infinite impulse response filter; and determining a compensation factor, for the oscillator.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of priority to all common subject matter of US Provisional Patent Application No. 62 / 069,170, filed October 27, 2014; the contents of which are incorporated herein by reference. technical field [0003] The present disclosure relates to real time clocks, and more particularly, to real time clocks with crystal oscillator temperature compensation. Background technique [0004] The sophistication and complexity of power grids has grown to include electricity meters that include timing functions for billing measurements. Timing features provide greater precision to consumers and suppliers by allowing increased ability to manage costs. For example, the timing function is useful in "time of use" metering where the cost of energy can vary depending on the moment the energy is used. [0005] Meters employing time-of-use metering employ real-time clocks, usually based on precision timing cr...

AI Technical Summary

Problems solved by technology

Adding a time delay can provide a more accurate correction factor than an uncompensated temperature measurement; however, a time delay is an incomplete solution because it introduces compensation errors when the ambient temperature drifts rapidly

[0008] Solutions have long been sought, but previous developments have not taught or suggested any complete solutions, and solutions to these problems have long remained elusive to those skilled in the art

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