Precision RTC Module with IIC Interface for AT24C32 and DS3231 Storage Clock

Low-cost, highly accurate I2C real-time clock (RTC) with integrated temperature-compensated crystal oscillator (TCXO) and crystal. Features battery backup input to maintain accurate timekeeping when main power is disconnected. Integrated oscillator improves long-term accuracy and reduces component count on the production line. DS3231 available in commercial and industrial temperature ranges, housed in a 16-pin 300-mil SO package. RTC maintains seconds, minutes, hours, day, date, month, and year information. Automatically adjusts for months with fewer than 31 days, including leap year correction. Clock supports both 24-hour and 12-hour formats with AM/PM indication. Includes two configurable alarms and a programmable square-wave output. Address and data transferred serially via I2C bidirectional bus. Precision temperature-compensated voltage reference and comparator monitor VCC to detect power failure, provide reset output, and automatically switch to backup power when needed. /RST pin supports manual microprocessor reset. DS3231 includes an integrated digital temperature sensor accessible via the same I2C interface used for timekeeping. Temperature sensor accuracy: ±3°C. On-chip power supply control circuit automatically detects and manages switching between main and backup (low-voltage battery) power sources. Maintains accurate time and temperature during main power failure without performance degradation. On-chip reset function restarts the system microprocessor when main power is restored or voltage returns to within the specified operating range. Note: Battery not included. Module parameters: Size: 38 mm (L) × 22 mm (W) × 14 mm (H) Operating voltage: 3.3–5.5 V Clock chip: DS3231 high-precision RTC Clock accuracy: ±2 ppm from 0°C to 40°C (~1 minute per year) Calendar and alarm functions with two alarms Programmable square-wave output Real-time clock provides seconds, minutes, hours, day, date, month, and year — valid through year 2100 with leap-year compensation Integrated temperature sensor with ±3°C accuracy Memory chip: AT24C32 (32 Kbit EEPROM) I2C bus interface, max speed 400 kHz at 5 V Compatible with other I2C devices; AT24C32 address configurable via A0/A1/A2 (default: 0x57) Includes rechargeable LIR2032 battery to maintain timekeeping during power loss Wiring example: SCL → A5, SDA → A4, VCC → 5V, GND → GND Quantity: 1 pc