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AN632

更新时间： 2022-11-29 07:30:45

品牌	Logo	应用领域
美信 - MAXIM		时钟
页数	文件大小	规格书
8页	333K
描述
Evaluating the Accuracy of Maxim Real-Time Clocks (RTCs)

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AN632 数据手册

REAL-TIME CLOCKS

Application Note 632: Aug 01, 2001

Evaluating the Accuracy of Maxim Real-Time Clocks (RTCs)

This app note describes methods for measuring the accuracy of the Maxim Real-Time

Clocks (RTCs) using available accurate time sources and the Maxim evaluation kits.

Evaluating the accuracy of Maxim real-time clocks (RTCs) can be simplified using the modern

personal computer (PC), an Internet connection, and RTC evaluation software. Whether you

use a Maxim evaluation kit and its associated software to evaluate the accuracy of a Maxim

real-time clock, or use your own software and hardware configuration, you can take advantage

of the easy methods presented here for long-term accuracy testing of RTCs.

RTC Evaluation Software

Figure 1 shows the main screen of typical Maxim RTC evaluation software. The "offset 1 sec"

in the current-time display section of the screen is computed as offset = RTC time - PC time.

This is now an easy and convenient way to keep track of the difference between the RTC time

and PC time and thus allows for long-term accuracy testing of the RTC.

When reading the RTC, the timekeeping registers are latched during a burst read. Even though

the RTC evaluation software reads the timekeeping registers approximately four times per

second, the best guaranteed resolution is 1 second, as all four reads could happen inside of a 1-

second update. Therefore, an initial offset calculation of ±1 second is within the resolution of

the setup when testing for long-term RTC accuracy.

The only issue now is the accuracy of the standard that the RTC time is being compared

against, the PC clock.

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