DS3231M+ datasheet, price, Arduino, RTC

DS3231M Pinout Equivalent

1：Overview of The DS3231M：

DS3231M is a high-precision I²C real-time clock (RTC) chip launched by Analog Devices (formerly Maxim), integrating MEMS resonator and temperature compensation function, suitable for industrial, consumer electronics and other scenarios that require accurate timing.
±5ppm accuracy (-45°C to +85°C), daily error is only ±0.432 seconds, supports leap year compensation until 2100. Dual power supply input (VCC main power supply + VBAT backup battery). Automatically switch to the battery when the main power supply is cut off to maintain timing.

2：DS3231M Important pin function definition:

3：Alternative model recommendation:

DS1307：Classic low-cost RTC, I²C interface, without temperature compensation, accuracy ±20ppm (0°C~70°C).Low cost and no external crystal oscillator is needed (built-in 32.768kHz crystal oscillator).Consumer electronics with low requirements for time accuracy (such as electronic clocks and small household appliances).

PCF85263AT/AJ : I²C interface RTC, without temperature compensation, accuracy ±1min / month (25°C). Functions: dual alarms, programmable square wave (1Hz~4096Hz), 64-byte RAM, power failure detection.Support wide voltage (1.1V – 5.5V) and low power consumption (standby current < 0.1μA).

MCP79410: MCP79410 is a low-cost real-time clock (RTC) chiplaunched by Microchip. It integrates a clock/calendar, dual alarms, 64 bytes of SRAM, 1KB of EEPROM and battery switching function. It supports I²C/SPI dual interfaces and is suitable for scenarios that do not require high precision but pay attention to cost and integration.

RX-8025: RX-8025 is a high-precision I²C real-time clock chip launched by EPSON. It has a temperature-compensated crystal oscillator (DTCXO/TCXO) built-in. It supports a wide voltage range and low power consumption. It is widely used in scenarios such as electricity meters, industrial control, and the Internet of Things.