DS3234 RTC Breakout

The DS3234 RTC Breakout provides highly accurate, battery-backed real-time clock functionality over SPI.

Achieve highly accurate and reliable timekeeping in your projects with the DS3234 RTC (Real time clock) breakout. This module uses a temperature-compensated crystal oscillator (TCXO) with an integrated crystal, delivering exceptional long-term stability and accuracy compared to standard microcontroller clocks. It's ideal for applications such as data logging, automation, industrial control, and other time-critical embedded systems.

The breakout communicates over a 4-wire SPI interface, making it a great choice for projects where I²C is unavailable or already in use. It tracks seconds, minutes, hours, day, date, month, and year with automatic leap-year compensation up to 2099. All DS3234 pins are broken out and the board is fully breadboard compatible, ensuring easy integration into both prototypes and finished designs.

A built-in CR2032 battery holder (battery not included) keeps time running even during power loss, while 256 bytes of battery-backed SRAM allow you to store critical data persistently. Additional features such as two programmable alarms, square-wave and 32.768 kHz outputs, and an integrated temperature sensor make this breakout a versatile and dependable solution for precise timekeeping projects.

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Features

• DS3234 high-precision SPI real-time clock with integrated TCXO
• Accuracy up to ±2 ppm (0°C to +40°C) and ±3.5 ppm (-40°C to +85°C)
• 4-wire SPI interface (supports SPI modes 1 and 3)
• Tracks time and date with automatic leap-year compensation (up to 2099)
• CR2032 battery backup for uninterrupted timekeeping
• 256 bytes of battery-backed SRAM for persistent data storage
• Two programmable time-of-day alarms
• Programmable square-wave output and dedicated 32.768 kHz output
• Integrated digital temperature sensor for oscillator compensation
• Wide operating voltage range: 2.0 V to 5.5 V
• All pins broken out, breadboard-compatible layout
• Open-source hardware design, made in EU
• Full technical support

Resources

• Arduino library
• Pinout drawing

Package Contents

• 1x DS3234 RTC Breakout
• 1x Header strip