DS3231M application circuit use case

The DS3231M is a low-cost, high-precision I2C real-time clock (RTC). The device includes a battery input to maintain accurate timekeeping when mains power is removed. Integrated micro-electro-mechanical systems (which is the English abbreviation of "Micro-Electro-Mechanical Systems". MEMS is the name of the United States. It is called micro-machines in Japan and micro-systems in Europe. It refers to the mass-produced MEMS is a micro device or system that integrates micro mechanisms, micro sensors, micro actuators, signal processing and control circuits, and interfaces, communications and power supplies. Developed due to the development of ) improves the long-term accuracy of the device and reduces the number of components in the production line. The DS3231M is available in the same device package as the popular DS3231 RTC.
The RTC stores seconds, minutes, hours, day of the week, date, month and year information. For months with less than 31 days, the end of the month date will be automatically adjusted, including leap year corrections. The clock format can be 24-hour or 12-hour format with /AM/PM indication. Provides two settable calendar alarms and a 1Hz output. Address and data are transmitted serially through the I2C bidirectional bus. Precision, temperature-compensated voltage reference and comparator circuitry monitors VCC status, detects power supply failures, provides a reset output, and automatically switches to backup power when necessary. In addition, the /RST monitoring pin can be used as a key input to generate a microprocessor reset.

DS3231M Reference Application Circuit