DS3231SN

DS3231SN is a high-precision I2C real-time clock with a temperature-compensated oscillator and battery backup. It keeps accurate time and date, supports alarms, and provides a programmable square-wave output. It requires a 32.768 kHz crystal connected to X1/X2 and stores data in 56 bytes of RAM. It includes a temperature sensor (0.25°C resolution) for compensation and an aging offset to fine-tune the oscillator. It offers two alarm outputs (Alarm 1 and Alarm 2), a VBAT backup input with trickle-charge for a small rechargeable battery or supercapacitor, and an I2C interface with address 0x68. Operating voltage range is about 2.3–5.5 V. Typical accuracy is ±2 ppm from -40°C to +85°C. The SN suffix denotes an 8-pin package (SOP/SN). Common uses include time stamping, data logging, wakeup alarms, and timekeeping for power-fail resilient embedded systems.

Common equivalents to DS3231SN (I2C RTC with 32.768 kHz) include:
- ST M41T00/M41T02
- NXP PCF8563
- Renesas ISL1208
- Microchip MCP7940N / MCP79410 / MCP79412
- Seiko Instruments RX-8025 / RX-8029
- MicroCrystal RV-3028-C2
These offer similar RTC functionality (battery-backed, calendar/alarms) with varying oscillator integration.

DS3231SN Features:
- Real‑time clock with integrated 32.768 kHz TCXO crystal oscillator for high accuracy
- Temperature‑compensated oscillator: typical ±2 ppm from -40°C to +85°C
- I2C interface (Fast-mode up to 400 kHz)
- Battery backup input (VBAT) with automatic switchover to keep time during power loss
- Alarm functions: Alarm 1 and Alarm 2 with flexible masking options
- Programmable SQW/INT output for square wave or interrupt signaling
- On‑chip temperature sensor and full calendar (including leap year)
- 8‑pin package (DS3231SN) with low power consumption in battery mode

DS3231SN is an 8-pin package (SOP-8/SOIC-8). It is a high-accuracy I2C real-time clock with a 32.768 kHz crystal input, timekeeping registers (seconds to years), optional alarms, temperature compensation, and battery-backup support (VBAT). It also provides a programmable square-wave/interrupt output (SQW/INT).

- Manufacturer: Maxim Integrated (the DS3231SN is a product from Maxim; the company is now part of Analog Devices).
- What kind of company: an American multinational semiconductor company that designs and manufactures analog and mixed-signal integrated circuits.

DS3231SN is an I2C real‑time clock with a temperature‑compensated crystal oscillator, battery backup, two alarms, and a programmable square‑wave output. It provides accurate timekeeping across temperature changes and power cycles.
Common application areas:
- Timekeeping and timestamping in microcontrollers, data loggers, wearables
- Event scheduling and wake/sleep control via alarms
- Power‑fail safe clocks for equipment, embedded systems, and portable devices
- Reference clock or 1 Hz/square‑wave output to synchronize peripherals
- Industrial automation and environmental monitoring with reliable timestamps

DS3231SN is in an 8-pin SOIC (Small Outline Integrated Circuit) package.