Elecrow
DS3231 High Precision RTC Clock Module for Raspberry Pi B+
A high-precision real-time clock (RTC) module based on the DS3231 IC, designed to plug directly into a Raspberry Pi B+ (and compatible with Arduino). The DS3...
A high-precision real-time clock (RTC) module based on the DS3231 IC, designed to plug directly into a Raspberry Pi B+ (and compatible with Arduino). The DS3231 maintains accurate timekeeping with ±5 ppm accuracy (±0.432 seconds per day) across −40 °C to +85 °C, and includes a coin cell battery backup to keep the clock running when the main board is powered off.
The module supports both 3.3 V and 5 V systems without level conversion, making it compatible with a wide range of boards. Communication is via I²C at up to 400 kHz.
Key Features
- DS3231 RTC IC – High-precision timekeeping with ±5 ppm accuracy
- Full Calendar – Seconds, minutes, hours, day, date, month, and year with leap year compensation valid until 2100
- Battery Backup – Coin cell maintains time when main power is off
- Two Alarms – Programmable calendar alarms
- Temperature Sensor – On-chip digital temperature sensor (±3 °C accuracy)
- Clock Outputs – 1 Hz and 32.768 kHz square wave outputs
- 3.3 V / 5 V Compatible – No level shifting required
Specifications
- RTC IC – DS3231
- Accuracy – ±5 ppm (−40 °C to +85 °C)
- Interface – I²C (up to 400 kHz)
- Supply Voltage – 2.3–5.5 V
- Operating Temperature – −40 °C to +85 °C
Ideal For
- Raspberry Pi projects requiring accurate timekeeping
- Data logging with timestamps
- Alarm clocks and scheduling systems
- Arduino projects needing a battery-backed RTC
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- ppm
- ppm means parts per million, a common way to express very small gas concentrations in air. For CO₂ sensors, the ppm range tells you what levels the sensor can measure, such as normal indoor air through to poorly ventilated spaces.
- RTC
- A Real-Time Clock keeps track of time even when the main processor is asleep or powered down, usually with a small backup battery. It matters for data logging and tracking projects that need accurate timestamps.
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