DS3231 High-Precision Clock Module
The DS3231 is a low-cost, high-precision I²C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device includes a battery input to maintain accurate timekeeping when the main power is disconnected. The integrated crystal improves the device's long-term accuracy and reduces the number of components in the production line. The DS3231 is available in commercial and industrial temperature ranges, packaged in a 16-pin 300mil SO package.
The RTC maintains seconds, minutes, hours, day of the week, date, month, and year information. Months with fewer than 31 days automatically adjust the end-of-month date, including leap-year corrections. The clock can operate in 24-hour format or 12-hour format with AM/PM indicators. Two programmable calendar alarms and a programmable square-wave output are provided. Address and data are transmitted serially via the I²C bidirectional bus.
A precision, temperature-compensated voltage reference and comparator circuit monitor the VCC status, detect power supply failures, provide a reset output, and automatically switch to the backup power supply when necessary. Additionally, the /RST monitor pin can be used as a manual input to generate a μP reset.
Beyond high timekeeping accuracy, the DS3231 offers other features that expand the host system's additional capabilities and selection range. The device integrates a highly accurate digital temperature sensor, accessible via the I²C* interface (in the same way as time data). This temperature sensor has an accuracy of ±3°C. On-chip control circuitry enables automatic power supply detection and manages power switching between the main power supply and backup power (i.e., a low-voltage battery). If the main power supply fails, the device continues to provide accurate timekeeping and temperature readings without performance degradation. When the main power supply is reconnected or the voltage returns to the acceptable range, the on-chip reset function can be used to restart the system microprocessor.
Module Parameters:
- Dimensions: 38mm (L) * 22mm (W) * 14mm (H)
- Weight: 8g
- Operating Voltage: 3.3–5.5V
- Clock Chip: High-precision clock chip DS3231
- Clock Accuracy: ±2ppm within 0–40°C, approximately 1 minute per year
- Two calendar alarms
- Programmable square-wave output
- Real-time clock generates seconds, minutes, hours, day of the week, date, month, and year timing, with leap-year compensation valid until 2100
- On-chip temperature sensor with ±3°C accuracy
- Memory Chip: AT24C32 (32K storage capacity)
- I²C bus interface, maximum transmission speed 400KHz (at 5V operating voltage)
- Can be cascaded with other I²C devices; the 24C32 address can be modified by shorting A0/A1/A2, default address is 0x57
- Equipped with CR2032 battery to ensure the clock continues to operate normally after system power loss
- Packaging: Individual anti-static packaging
Wiring Instructions (for Arduino Uno R3 as an example):
- SCL → A5
- SDA → A4
- VCC → 5V
- GND → GND
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