HKD I2C Real Time Clock DS3231S - ChronoDot V2.0 RTC Module

The HKD I2C Real Time Clock DS3231S ChronoDot V2.0 is a professional-grade timekeeping module that delivers exceptional accuracy and reliability for your electronics projects. Built around the industry-leading DS3231SN high-precision clock chip, this compact RTC module maintains accurate time and date information even when your main system is powered down.

Key Features

Ultra-High Precision Timekeeping

• DS3231SN temperature-compensated crystal oscillator (TCXO) chip
• Built-in 32.768kHz crystal for exceptional stability
• 2ppm accuracy from -40 C to +85 C (less than 2 minutes drift per year)
• Complete calendar function with automatic leap year compensation

Comprehensive Time & Date Output

• Accurate year, month, day, hour, minute, and second tracking
• Morning/afternoon (AM/PM) indication support
• Automatic day-of-week calculation
• Century handling with proper rollover functionality

Versatile Signal Output

• 1Hz square wave output (one pulse per second)
• Perfect for LED indicators, system synchronization, or interrupt generation
• Stable frequency reference for timing-critical applications

Reliable Power Management

• CR1220 button battery backup support for continuous operation
• Automatic power-fail switchover maintains timekeeping during outages
• Ultra-low backup current consumption (< 3 A)
• Battery life of several years in backup mode

Easy Integration

• Standard I2C communication protocol (address 0x68)
• Pre-installed pull-up resistors (R1, R2) - no external components needed
• Compatible with Arduino and most microcontroller platforms
• Comprehensive Arduino library files and example routines included

Compact Professional Design

• Small circular form factor: 30mm (3cm) diameter
• Standard pin spacing: 22.86mm (0.9") for breadboard compatibility
• High-quality PCB construction with clear labeling
• Space-efficient design ideal for embedded applications

Technical Specifications

• Clock Chip: DS3231SN with integrated TCXO
• Communication: I2C interface (100kHz/400kHz)
• Accuracy: 2ppm ( 2 minutes/year max drift)
• Operating Temperature: -40 C to +85 C
• Supply Voltage: 3.3V to 5V
• Backup Battery: CR1220 (not included)
• Dimensions: 30mm diameter, standard pin spacing
• Current Consumption: <3 A in backup mode

Perfect For

• Data logging systems requiring accurate timestamps
• Digital clocks and time displays
• IoT projects with time-based scheduling
• Security systems and access control
• Weather stations and environmental monitoring
• Industrial automation and process control
• Any project requiring precise, persistent timekeeping

Why Choose ChronoDot V2.0?

Unlike basic RTC modules that can drift several minutes per month, the ChronoDot V2.0's DS3231SN chip provides temperature-compensated accuracy that maintains precision across varying environmental conditions. The integrated crystal eliminates external timing components, while the pre-installed I2C pull-up resistors simplify installation. With comprehensive Arduino support and battery backup capability, this module offers professional-grade reliability for hobbyist and commercial applications alike.

Order your HKD I2C Real Time Clock DS3231S ChronoDot V2.0 today and add precision timekeeping to your next project!

What's in the box
1 x HKD I2C Real Time Clock DS3231S - ChronoDot V2.0 RTC Module