DS3231 real-time clock module - I2C, ±2 ppm, for Raspberry Pi
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Description
Product Overview
- Real-time clock (RTC module) with a precise crystal oscillator for Raspberry Pi
- Temperature measurement range: -40 to +85 °C; time deviation accuracy: ±2 ppm
- I2C interface, requires two GPIO pins (SDA, SCL)
- Backup CR2032 coin cell maintains the system time during power outages
- Small circuit board (approx. 30 * 25 mm) with pin headers for direct installation
- Integrated temperature compensation for consistent accuracy
Product Description
An RTC module with a DS3231 chip provides accurate system time even when the Raspberry Pi is switched off or has no internet connection. The I2C bus requires only two data lines and shares them with other I2C modules, keeping the number of pins used to a minimum.
The module works independently of the internet and keeps time using an integrated battery controlled by the crystal oscillator. The current time does not need to be re-entered after power outages, which is especially useful for projects without a network connection or in remote applications. The internal temperature sensor also allows you to read the current ambient temperature over the same I2C interface.
Applications range from data loggers that store timestamps offline to IoT devices designed to work without external time synchronization. Automation projects with scheduled operations also benefit from not missing a planned action when the network is interrupted. Simple weather stations can also use the module to timestamp their measurements accurately.
The crystal oscillator keeps time deviation to a maximum of two millionths of a second per second, which under real-world conditions amounts to an error of about two seconds per million seconds of operation. The CR2032 battery typically lasts several years before it needs to be replaced. Connect the module using the four wires 5 V, GND, SDA, and SCL; it supports both 3.3 V and 5 V logic levels and can be connected directly to Raspberry Pi GPIO pins.
Safety Notice
This module is intended exclusively for building prototypes and for testing and development purposes. Do not puncture, solder, or damage the CR2032 battery. Do not install it in household mains wiring.
Scope of Delivery
- 1* DS3231 clock module for Raspberry Pi