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AN53313 - Real Time Clock Calibration in Cypress nvSRAM | 赛普拉斯半导体

AN53313 - Real Time Clock Calibration in Cypress nvSRAM

最近更新: 
2021 年 3 月 02 日
版本: 
*E

AN53313 describes the Real Time Clock (RTC) calibration feature in Cypress nvSRAM that helps to maintain precise system time by compensating for the crystal frequency error.

简介

The Real Time Clock (RTC) in Cypress nvSRAM is driven by a crystal oscillator, with an external crystal having a nominal frequency of 32.768 kHz. Most 32.768-kHz crystals have a frequency tolerance of ±20 parts per million (ppm) at +25 °C. This frequency tolerance results in timing error over a long period of time. For example, a crystal with 20-ppm error in nominal frequency can drift the clock accuracy by 52 seconds in a month. You can compensate this drift by using  the calibration feature in the nvSRAM RTC.

 

Calibration Circuit Block Diagram

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Thank you for choosing our products. They come with all the know-how and passion that our engineers have put into it. As you probably already know, Cypress is now Infineon. This is a major step for our company, but also for the good of you. 

Reliability and business continuity are of utmost importance for us. Hence, we remain fully committed to honoring existing customer and distributor relationships. This includes offering the legacy Cypress product portfolio. We thank you very much for your trusting support.

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