PCF8563T Real Time Clock (RTC) Module

From the shop's description

PCF8563 RTC Module The PCF8563 real-time clock module features high accuracy and low power consumption. This RTC maintains seconds, minutes, hours, day, date, month, and year information. In this module, the date is set based on whether the month is 29, 30 or 31 days and also it is leap year or not. This module can also be used in 12-hour and 24-hour formats. Features: All that might be used is that in addition to the two required ports of SDA and SCL, the ints and COT that might be used are also cited. Spare battery: when the system is out of power, the backup battery will power PCF8563 chip, PCF8563 low power consumption, and ensure that the battery can be used for normal power supply for ten years. Crystal vibration: the new original product crystal vibration, guaranteed the chip PCF8563 stable, accurate time. The advantage of the chip itself: in the actual project of the shop owner, a variety of clock chips have been applied, and it is found that this chip of philips is the most stable, the most accurate and the lowest power consumption. Clock chips such as DS1302 are too weak to recommend PCF8563 clock chips. PCF8563 main performance indicators: It can be powered by a spare battery. Wide voltage range 1.0~ 5.5v. Ultra low power consumption: a typical value of 0.25uA. Through the I2C bus serial input/output. The output frequency of the programmable clock is 32.768khz, 1024Hz, 32Hz, 1Hz. There are four alarm functions and timer functions. It contains reset circuit, oscillator capacitance and power loss detection circuit. To open the leakage interrupt output. Read and write 400KHZ. Note : This product need battery CR1220 you can buy it separately DS3231 RTC Module Pinout This module has 6 pins: INT : interrupt output COT : Clock output SCL : Serial Clock Input for I2C protocol SDA : Serial Data Input / Output for I2C protocol GND : Ground VCC : Module power supply – 5V