RTC TLC 5947-el

IC adatlap (PDF) :  https://datasheets.maximintegrated.com/en/ds/DS3231.pdf  
  https://www.robotshop.com/media/files/pdf/ds3231-high-precision-rtc-clock-module-raspberry-pi-datasheet.pdf 

 Alkalmazási ábra.  https://os.mbed.com/components/DS3231/  

Leírások:

 https://www.rpibolt.hu/termek/precizios_i2c_real_time_clock_modul_homerseklet_kompenzacioval_raspberry_pi-hez_-_ds3231.html  

 http://stmargaretsaspley.co.uk/libro/B01F6MJZGQ.html 

Overview

The RTC module is an ultra low power type and can be connected directly to a Raspberry PI. Although it is designed to be compatible with this development plaque, it can be adapted and used with other types of micro controller or plaques, such as Arduino.

RTC modules are generally useful to memorize date and time, providing backup solutions when the main power supply is cut off. Another advantage is that you do not have to do anything, just communicate with the circuit and read the clock from its registers.

Specifications

Supply voltage: 2.3 V to 5.5 V (3.3 V recommended);

Backup battery voltage: 2.3 V to 5.5 V (3 V recommended);

Current consumption: 300 μA;

Accuracy: ± 3.5 ppm;

Also includes temperature sensor;

Communicates on the I 2 C interface at a maximum frequency of 400 kHz;

Can memorize: hour, minute, second, day of the week, day of the month, month and year;

Two alarms can also be set.