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The DS3231 High-Precision I2C RTC Memory Module is a low-cost, ultra-precise timekeeping solution designed to eliminate the long-term cumulative errors that compromise standard quartz crystals. Standard clock crystals are highly sensitive to external temperature variations, leading to noticeable timing drift over weeks or months. The DS3231 solves this issue by integrating a Temperature-Compensated Crystal Oscillator (TCXO) directly into its silicon gates. An internal 10-bit temperature sensor continually monitors ambient conditions and automatically adjusts the oscillator tuning to guarantee rock-solid accuracy.

To maximize utility for datalogging and telemetry networks, the module also incorporates an AT24C32 32Kbit Serial EEPROM non-volatile memory chip. The memory and clock chips share the exact same 2-wire fast I2C communication bus (400kHz), meaning you can store time-stamped system event logs, sensor trends, or calibration arrays without using up any additional pins on your microcontroller. The board features an integrated battery holder on the bottom side, enabling continuous timekeeping backup whenever the primary system power drops out.

Key Features & Benefits:

• Uncompromising Industrial Accuracy: Operates at a precise ±2ppm rating across a 0°C to +40°C window, ensuring less than 60 seconds of cumulative timing deviation over an entire year.

• Full-Featured Calendar Engine: Manages seconds, minutes, hours, day of the week, date, month, and year data automatically, including leap-year compensation valid all the way up to the year 2100.

• Dual Programmable Alarms: Outfitted with two independent daily alarms and an internal hardware interrupt output pin (SQW/INT) that can wake up sleeping microcontrollers from deep-sleep modes.

• Configurable I2C Memory Addressing: Features surface-mount solder jumpers (A0, A1, A2) on the PCB to adjust the hardware slave address of the EEPROM, avoiding address collisions on complex shared buses.

Technical Specifications

Hardware Bus Addressing & Wiring Scheme:

The module isolates communication to a single I2C bus structure. Because the clock and memory sections have unique hardware slave addresses, they live together peacefully on the same wires without data collisions:

• DS3231 Clock Register Address: Fixed at 0x68

• AT24C32 Memory Register Address: Default mapped to 0x57 (Can be altered using the onboard A0, A1, A2 solder address pads).

• VCC / GND: Main supply lines (+2.7V to 5.5V).

• SCL / SDA: I2C clock and data input paths. Connect directly to your controller's hardware serial bus lines.

• SQW (Square Wave / Interrupt): Outputs a configurable square wave frequency (1Hz, 4kHz, 8kHz, 32kHz) or acts as an active-low alarm trigger to wake up external microprocessors.

• 32K: Outputs the raw 32.768kHz clock signal directly from the internal TCXO.

Technical Specifications