{"title":"Gravity: I2C SD2405 RTC Module","handle":"gravity-i2c-sd2405-rtc-module","url":"/products/gravity-i2c-sd2405-rtc-module","description":"A high-precision I2C real-time clock (RTC) module from DFRobot's Gravity series, based on the SD2405AL chip. It features an internal rechargeable battery that keeps time for 5–8 years without external power, making it ideal for data logging, alarm clocks, and any project that needs reliable timekeeping.\n\nThe module includes crystal compensation for ±5 ppm accuracy across industrial temperature ranges, automatic power switching between primary and battery power, and a Gravity I2C connector for plug-and-play wiring.\n\nKey Features\n\n\nInternal Rechargeable Battery – Keeps time for 5–8 years without external power\n\nHigh Accuracy – ±5 ppm from -40°C to +85°C with crystal compensation\n\nUltra-Low Power – 1 µA typical on battery (at 25°C)\n\nAutomatic Power Switching – Seamless switchover between primary and battery power\n\nThree Alarm Interrupts – Configurable by year, month, date, day, hour, minute, second\n\nProgrammable Clock Output – 32.768 kHz to 1/16 Hz square wave\n\nCountdown Timer – With interrupt output\n\n12-Byte SRAM – General-purpose on-chip storage\n\nGravity I2C Connector – Plug-and-play with Gravity-compatible boards\n\n\nSpecifications\n\n\nOperating Voltage – 3.3–5.5V\n\nI2C Speed – Up to 400 kHz (at 4.5–5.5V)\n\nAccuracy – ±5 ppm (-40°C to +85°C)\n\nTiming Range – Up to 2099 (with leap year compensation)\n\nClock Output – Selectable 32.768 kHz to 1/16 Hz\n\nTime Format – 12-hour or 24-hour selectable\n\nDimensions – 35.5 × 22 mm (1.4 × 0.87″)\n\nWeight – 6 g\n\n\nIdeal For\n\nData logging with timestamps\nAlarm clocks and timer applications\nScheduled task triggering\nAny project requiring accurate, battery-backed timekeeping\n\n\nPackage Contents\n\n1× Gravity I2C SD2405 RTC Module\n1× Gravity I2C 4-Pin Sensor Cable\n1× XH2.54 5-Pin Header\n\n\nResources\n\nDFRobot Wiki\n","vendor":"DFRobot","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":6528,"title":"Default Title","sku":"DF-DFR0469","price":14.59,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":393,"option1":"Default Title"}]}