DS3231 is equipped with integrated TCXO and crystal, which make it a cost-effective I2C real time clock with high precision.
The device carries a battery input, so if you disconnect the main power supply, it can still maintain accurate timing.
The integrated oscillator ensures the long-term accuracy of the device and reduces the number of components.
DS3231 provides both commercial and industrial temperature range and supports 16 pins small-outline package (300mil).
The module itself can adapt to the system of 3.3V and 5V without level switch, which is quite convenient!

Specification

1)Temperature range: -40 to +85; Timing accuracy : ± 5ppm (±0.432 seconds / day)

2)Provide battery backup for continuous timing

3)Low power consumption

4)Device package and function compatible with DS3231

5)Complete clock calendar function contains seconds and minutes, hour, week, date, month, and year timing and provides leap year compensation until 2100.

6)Two calendar clock

7)Output: 1Hz and 32.768kHz

8)Reset output and Input Debounce of Pushbutton

9)High speed (400kHz), I2C serial bus

10)Supply voltage: +3.3V to +5.5V

11)Digital temperature sensor with a precision of±3℃

12)Working temperature: -40 ~ C to +85 ~ C

13)16 pins Small Outline Package (300mil)

See product video: https://youtu.be/pganNMCNp2g