{"title":"Adafruit DS3231 Precision RTC Breakout","handle":"adafruit-ds3231-precision-rtc-breakout","url":"/products/adafruit-ds3231-precision-rtc-breakout","description":"The Adafruit DS3231 Precision RTC is a highly accurate I2C real-time clock breakout with an integrated temperature-compensated crystal oscillator (TCXO). Unlike standard RTCs that rely on an external 32 kHz crystal, the DS3231 houses the crystal internally alongside a temperature sensor that continuously compensates for frequency drift, delivering accuracy of ±2 ppm (about ±1 minute per year).\n\nWith a CR1220 coin cell on the back, the DS3231 maintains precise timekeeping for years even when main power is lost — ideal for data logging, clocks, and any project where reliable time is critical.\n\nKey Features\n\n\nIntegrated TCXO – On-chip crystal and temperature sensor for automatic drift compensation\n\n±2 ppm Accuracy – Approximately ±1 minute per year, far superior to standard RTCs\n\nBattery Backup – CR1220 coin cell holder on board for uninterrupted timekeeping during power loss\n\nI2C Interface – Simple two-wire communication with standard I2C addressing\n\nLow Power – Minimal current draw in battery-backup mode\n\nBreadboard-Friendly – Compact breakout with included header strip\n\n\nAlso Available\n\n\nDS3231 Precision RTC – STEMMA QT version (solderless I2C connectors)\n\nDS1307 RTC Breakout (basic, lower cost)\n\nPCF8523 RTC Breakout (3.3V compatible)\n\n\nIdeal For\n\nPrecision data logging with accurate timestamps\nClocks and timers requiring minimal drift\nIoT devices needing reliable timekeeping through power cycles\nProjects where an external crystal's temperature sensitivity is unacceptable\n\n\nPackage Contents\n\n1× Adafruit DS3231 Precision RTC Breakout (fully assembled and tested)\n1× Header strip\n\n\n\nNote: A CR1220 coin cell battery is required for battery-backup operation and is not included.\n","vendor":"Adafruit","product_type":"physical","in_stock":false,"options":[],"variants":[{"id":10861,"title":"Default Title","sku":"AF-3013","price":36.58,"on_sale":false,"in_stock":false,"available_quantity":0,"option1":"Default Title"}]}