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AN53313 - Real Time Clock Calibration in Cypress nvSRAM

Last Updated: 08/15/2012
Version: *A


The nvSRAM Real Time Clock (RTC) is driven by a crystal oscillator with a nominal frequency of 32.768 kHz. The standard 32.768 kHz crystals have a frequency tolerance of ±20 ppm at +25°C, and a nonlinear temperature drift of -0.036 ppm/°C2. The ppm error due to tolerance or temperature drift at a constant temperature can be fixed using the nvSRAM RTC Calibration circuit.

This application note discusses the operation and usage of the nvSRAM RTC Calibration circuit to maintain precise time by compensating for ppm variations. More...


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Related Application Notes:
Domain Tags: Async, Non Volatile Memories, RTC

Related Knowledge Base: Clock, I2C, nvSRAM, Parallel, RTC, Serial, SPI, Async
Spec No: 001-53313; Sunset Owner: ZSK; Secondary Owner: PSR; Sunset Date: 09/22/11

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