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DS3231M+ datasheet, price, Arduino, RTC

Explore the DS3231M+ Reference Manual for comprehensive details on this real-time clock. Ideal for Arduino and Raspberry Pi projects, it includes information on circuit design, PCB layout, pinout, and address configuration. Compare DS3231SN vs DS3231M to understand key differences.

Brands: Analog Devices Inc./Maxim Integrated

Download: DS3231M+ Datasheet PDF

Package: 16-SOIC (0.295, 7.50mm Width)

Series: -

In Stock: 12,252

Type: Clock/Calendar

Date Format: YY-MM-DD-dd

Interface: I²C, 2-Wire Serial

Voltage-Supply: 2.3V ~ 5.5V

Price: inquiry

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:

Pin Number	Pin Name	Description
Pin1	32kHz	32.768kHz frequency output pin, open-drain output, requires an external pull-up resistor.
Pin2	VCC	Main power input, with an operating voltage range of 2.3V – 5.5V.
Pin3	INT/SQW	This pin has two working modes. When used as an interrupt output pin (INT), it is active low and is used for interrupt events such as alarm triggers. When used as a square wave output pin (SQW), it can output square wave signals of 1Hz, 4kHz, 8kHz or 32kHz.
Pin4	RST	RST pin, active low, used to reset the internal registers of the chip.
Pin5	GND	Grounding pin.
Pin6	VBAT	VBAT pin is the backup battery input pin. When the main power supply VCC is powered off, the battery connected to this pin supplies power to the chip to maintain clock timing.
Pin7	SDA	Data pin of the I²C bus for data transmission with the microcontroller.
Pin8	SCL	The clock pin of the I²C bus provides a clock signal for I²C communication.

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.