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MEMS精准实时时钟应用笔记

消耗积分:0 | 格式:pdf | 大小:7.23 MB | 2012-11-08

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In 1999, Maxim Integrated introduced the DS32kHz, a 32.768kHz temperature-compensated crystaloscillator (TCXO), which was the industry's first accurate timekeeping product for real-time clock(RTC) applications. The product boasted an accuracy of ±7.5ppm across the entire -40°C to +85°Cindustrial temperature range.
By 2005, with the combination of innovative packaging technology and improved temperature sensorcapability, we introduced what would be considered the industry’s most accurate RTC, the DS3231S,an extremely accurate I²C-integrated RTC/TCXO/crystal. The DS3231S featured a highly reliable andinnovative package that incorporated a 32kHz tuning fork crystal into a standard 16-pin, 300-mil SO.This highly integrated device further enhanced timekeeping accuracy by providing a frequency accuracyof less than ±3.5ppm over the -40°C to +85°C temperature range. This accuracy is equivalent to lessthan ±0.3 seconds/day.
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