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The DS3231 are low-cost, extremely accurate I2C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. No need for an external crystal.
USE A RECHARGEABLE BUTTON BATTERY ONLY!
A regular battery will be destroyed and may blow up and cause further damage.
As a Li-Ion LIR2032 rechargeable battery gets closer to being fully charge, the current to it, will drop; and effectively will provide a trickle-charge to the battery.
1 Size: 38mm (length) * 22mm (W) * 14mm (height)
2 Weight: 8g
3 Operating voltage :3.3 – 5 .5 V
4 clock chip: high-precision clock chip DS3231
5 Clock Accuracy :0-40 ℃ range, the accuracy 2ppm, the error was about 1 minute
6 programmable square-wave output
8 Real time clock generator seconds, minutes, hours, day, date, month and year timing and provide valid until the year 2100 leap year compensation
9 chip temperature sensor comes with an accuracy of ± 3 ℃
10 memory chips: AT24C32 (storage capacity 32K)
Wiring instructions (with Arduino uno r3 for example):
SCL → A5
SDA → A4
VCC → 5V
GND → GND