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Synchronization of a generated clock

A real-time clock, synchronous circuit technology, used in synchronization, clocks driven by synchronous motors, clocks, etc.

Active Publication Date: 2012-02-01
MAXIM INTEGRATED PROD INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, the disadvantage of requiring complex circuitry to help determine whether an external reference signal is active or inactive in a simple, low-power manner needs to be overcome

Method used

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  • Synchronization of a generated clock
  • Synchronization of a generated clock
  • Synchronization of a generated clock

Examples

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Embodiment Construction

[0028] Referring now to the drawings, in which like numerals are used to refer to like elements throughout, illustrate and describe various views and embodiments of exemplary synchronization of clock-generating real-time clock devices. Furthermore, other possible embodiments are also described. The figures are not necessarily drawn to scale and in some instances the drawings have been exaggerated and / or simplified where appropriate for illustrative purposes only. Those skilled in the art will appreciate the many possible applications and variations based on the following examples of possible embodiments.

[0029] A low-current real-time clock (RTC) is a timekeeping device that operates on very low current. By operating on very low currents, exemplary RTCs help to extend the life of power sources such as batteries. Some example RTCs can be used with high ESR crystals in order to broaden the pool of crystals available for example devices. Additionally, some exemplary RTC circ...

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PUM

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Abstract

The invention relates to synchronization of a generated clock. A real time clock circuit is provided that has an onboard oscillator continuously providing an internal clock frequency, which is digitally synchronized to a more accurate reference clock frequency. An exemplary real time clock inhibits synchronization of the internal clock frequency when the reference clock is unavailable or if the reference clock's frequency is outside of a defined accuracy range.

Description

technical field [0001] The present invention relates generally to real-time clock circuits and devices, and more particularly to real-time clock circuits using an on-board oscillator circuit that provides a frequency that can be corrected or adjusted by an external reference signal when available. timing signal. Background technique [0002] A real-time clock keeps track of what people know as seconds, minutes, hours, days, months, and years. A low current real-time clock (RTC) is a timekeeping circuit and device that provides a very low standby current for longer life of a power source such as a battery or other rechargeable power source within an electronic device. The RTC can be read by other circuits or chips that require time, amount of elapsed time, or time-based alarms. For example, software within the computer may request the microprocessor or another device to read the time from the RTC's storage or registers for use by other circuits or software. [0003] A real...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04G3/00G04G7/00
CPCG04G7/005
Inventor L·雷蒙德
Owner MAXIM INTEGRATED PROD INC