AN53313 - Real Time Clock Calibration in Cypress nvSRAM | Cypress Semiconductor
AN53313 - Real Time Clock Calibration in Cypress nvSRAM
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.
|File Title||Language||Size||Last Updated|
|AN53313 Real Time Clock Calibration in Cypress nvSRAM.pdf||English||703.33 KB||08/31/2016|
|AN53313 Real Time Clock Calibration in Cypress nvSRAM (Chinese).pdf||Chinese||932.42 KB||08/25/2015|
|AN53313 Real Time Clock Calibration in Cypress nvSRAM (Japanese).pdf||Japanese||1018.91 KB||08/25/2015|
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|AN61546 - Nonvolatile Static Random Access Memory (nvSRAM) Real Time Clock (RTC) Design Guidelines and Best Practices||08/18/2015|