SPECIFICATIONS

DS3231 Precision RTC Module: Time, Down to the Second! Built-in TCXO, ±1min/Year Accuracy, Battery Backup & EEPROM. The Ultimate Timebase for Data Logging Projects.

Key Features & Benefits:

⏱️ ±1 Minute/Year Accuracy: Features a Temperature-Compensated Crystal Oscillator (TCXO) with ±2ppm precision, offering far superior stability than common DS1307 modules. Ideal for data loggers, weather stations, etc.

🌡️ Built-in Temperature Sensor: Read ambient temperature via I2C for system compensation or environmental monitoring, eliminating the need for an extra sensor.

🔋 Timekeeping Never Stops: Onboard CR2032 coin cell holder (Battery NOT Included). Automatically switches to battery backup when main power is lost, ensuring the clock runs continuously.

💾 Onboard 32KB Memory: Integrated AT24C32 EEPROM provides 32KB of non-volatile storage for device settings, event logs, or other critical data.

🔌 Plug & Play, Wide Compatibility: Standard I2C interface, compatible with 3.3V/5V logic. Comprehensive Arduino library support. Easily works with Arduino, ESP8266/ESP32, Raspberry Pi, and more.

Product Description:

Tired of resetting the time every time your microcontroller reboots? Does inaccurate timestamping ruin your data logging projects? The DS3231 RTC module is the professional answer. It delivers atomic-clock-like precision and reliability, ensuring your IoT devices, automation systems, or scientific instruments have an independent, continuous, and accurate time source.

🚨 Critical Notes Before Purchase & Usage Guide

❌ 【Product Clarification】: This is an I2C module, NOT a standalone clock display!
It requires a microcontroller (like Arduino) and programming to read/set the time. The module itself has no display and cannot show the time independently.

⚠️ 【Most Common Misconceptions & Misuse】

Battery NOT Included! A CR2032 coin cell is NOT included. It is a REQUIRED accessory for battery-backed timekeeping. You must purchase it separately.
Initial Time Setting is MANDATORY! The module ships with no time set. You MUST run a "set time" sketch from your microcontroller upon first power-up for the clock to start. Otherwise, read data will be meaningless.
I2C Address Conflict: The DS3231 has a fixed I2C address of 0x68. If you have another device at address 0x68 on the same I2C bus, a conflict will occur, preventing communication.
Battery Polarity Warning: When installing the battery, ensure the CR2032 positive (+) side faces UP (towards the printed side). Reverse installation won't damage the module but will disable battery backup.
✅ 【Mandatory Prerequisites & Skill Level】

Required Accessory: You need to provide your own CR2032 3V Coin Cell Battery for battery-backed operation.

Required Skills: Basic experience with Arduino/microcontrollers, including I2C communication, library installation, and fundamental programming.

Required Software: You need to install the RTClib or similar DS3231-specific library in your Arduino IDE.

🔧 【Safety Warnings & Operational Notes】

ESD Precautions: The module contains precision CMOS chips. Handle with appropriate ESD precautions.

Soldering Care: If soldering headers, use a temperature-controlled iron and work quickly to avoid heat damage to the IC or battery holder.requisite

Specifications

Main IC: DS3231SN (High-Accuracy TCXO Version)

Memory IC: AT24C32 (32KB EEPROM)

Interface: I2C (Address: 0x68)

Logic Level: 3.3V / 5V Compatible

Clock Accuracy: ±2ppm (from 0°C to +40°C), approx. ±1 minute per year

Temperature Sensor: Built-in, 0.25°C resolution

Backup Battery: Supports CR2032 3V Lithium Cell (Battery NOT Included)

Timekeeping Current: ~3μA (Typical, on battery)

Module Size: Approx. 38mm x 22mm

Pins: Standard 2.54mm pitch headers (Unsoldered)

Package Includes

1 x DS3231 AT24C32 Precision RTC Real Time Clock Module (PCB)