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August 2007 Rev 1 1/14
AN2604
Application note
STM32F101xx and STM32F103xx RTC calibration
Introduction
The real-time clock (RTC) precision is a requirement in most embedded applications, but
due to external environment – temperature change, frequency variation of the crystal that
clocks the RTC – the RTC precision may not be as accurate as expected.
The RTC embedded in the STM32F101xx and STM32F103xx comes with a digital clock
calibration circuit suitable for manufacturing environments, that allows applications to
compensate for crystal and temperature variations. This application note discusses the RTC
calibration basics and explains how RTC calibration can be used to improve timekeeping
accuracy.
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