DS3231 I2C RTC Module – High Precision Clock for Raspberry Pi
DS3231 I2C RTC Module – High Precision Clock for Raspberry Pi
DS3231 High Precision I2C RTC Clock Module – Compatible with Raspberry Pi & 3.3V/5V Systems
Keep your projects perfectly on time with the DS3231 Real-Time Clock (RTC) Module. Featuring a high-precision I2C interface and built-in temperature-compensated crystal oscillator (TCXO), this compact module is ideal for Raspberry Pi, Arduino, and other microcontroller-based projects. It supports both 3.3V and 5V systems natively — no level conversion required.
Made in Mainland China.
Key Features
- Ultra-High Accuracy: Timing accuracy within ±5ppm (±0.432 seconds/day) across -40°C to +85°C
- Battery Backup: Maintains continuous timekeeping even when main power is off
- Full Calendar Function: Tracks seconds, minutes, hours, day of week, date, month, and year with leap year compensation valid through 2100
- Dual Calendar Alarms: Set two independent alarms for automated triggering
- Fast I2C Interface: Supports up to 400kHz high-speed I2C serial communication
- Dual Frequency Outputs: 1Hz and 32.768kHz square wave outputs for synchronization tasks
- Built-in Digital Temperature Sensor: Accuracy of ±3°C for ambient monitoring
- Wide Voltage Range: Operates from +2.3V to +5.5V — versatile across platforms
- Low Power Consumption: Energy-efficient design ideal for battery-powered builds
- 16-Pin SO (300mil) Package: Compact and easy to integrate onto breadboards or PCBs
Specifications
| Chip | DS3231 |
| Interface | I2C (400kHz fast mode) |
| Voltage | +2.3V to +5.5V (3.3V / 5V compatible) |
| Accuracy | ±5ppm (±0.432 sec/day) |
| Operating Temperature | -40°C to +85°C |
| Temperature Sensor Accuracy | ±3°C |
| Alarm Outputs | 2 programmable calendar alarms |
| Package | 16-pin SO (300mil) |
| Material | Plastic + Metal |
| Quantity | 1 piece |
| Battery | Optional (with or without backup battery) |
What's in the Box
- 1 × DS3231 RTC Module
Compatible With
Raspberry Pi (all models), Arduino, ESP32, ESP8266, STM32, and other 3.3V/5V microcontroller platforms. Ideal for data loggers, automation systems, IoT devices, clocks, and schedulers.
Related Products You May Like
- 10-Piece Gardening Tool Kit – Iron Head & Plastic Handle
- 10-Pc Hex Nut & Bolt Extractor Kit 9–19mm | HIP Tools
- 1/2" Drive 8-Piece Hex Short Socket Set – Vanadium Steel
Learn more: OSHA guidance on hand and power tools
Frequently Asked Questions
Q: Is the DS3231 RTC module compatible with Raspberry Pi and Arduino?
A: Yes! The DS3231 RTC module uses a standard I2C interface and is fully compatible with Raspberry Pi (all models), Arduino, ESP32, and most other 3.3V or 5V microcontroller boards — no level conversion hardware needed.
Q: Does the DS3231 module come with a battery for backup timekeeping?
A: This module is available with or without a backup battery. The battery backup option ensures the clock continues running accurately even when the main power supply is disconnected, preserving your time and date settings.
Q: How accurate is the DS3231 RTC module?
A: The DS3231 provides industry-leading accuracy of ±5ppm, which translates to approximately ±0.432 seconds per day across its full operating temperature range of -40°C to +85°C. This makes it one of the most precise RTC modules available for hobbyist and industrial use.
Q: Can I use this module for industrial automation applications?
A: Absolutely. The DS3231 is designed to perform reliably in demanding environments, including industrial automation, data logging, scheduled task controllers, and IoT devices. Its wide temperature tolerance and high precision make it well suited for these applications.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.