1.Real-time clock generates seconds, minutes, hours, days of the week, date, month and year timing, and provides valid until 2100 leap year compensation;2.Chip with internal temperature sensor, accuracy of ± 3 ° C;3.Memory chip: AT24C32 (memory capacity 32K)4.IIC bus interface, the highest transmission speed of 400KHz (operating voltage of 5V);5.Can be cascaded with other IIC devices, 24C32 address can be modified by short-circuiting A0/A1/A2, the default address of 0x57