Overview
The DS3231SN# is a highly accurate and low-cost real-time clock (RTC) produced by Analog Devices Inc. (now part of Maxim Integrated). This device integrates an I²C interface, a temperature-compensated crystal oscillator (TCXO), and a crystal, ensuring precise timekeeping. It is designed to maintain accurate time even when the main power is interrupted, thanks to its battery-backup input. The DS3231SN# is available in both commercial and industrial temperature ranges and is packaged in a 16-pin, 300-mil SOIC package.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Voltage | 2.3V to 5.5V |
| Operating Temperature | Commercial: 0°C to +70°C, Industrial: -40°C to +85°C |
| Accuracy | ±2ppm from 0°C to +40°C, ±3.5ppm from -40°C to +85°C |
| Temperature Sensor Accuracy | ±3°C |
| I²C Interface Speed | Up to 400kHz |
| Package Type | 16-pin SOIC |
| Package Dimensions | Length: 10.5mm, Width: 7.6mm, Height: 2.35mm |
| Power-Fail Voltage | 2.45V to 2.70V |
| Battery-Backup Input | Yes |
Key Features
- Highly accurate RTC with integrated TCXO and crystal.
- Manages all timekeeping functions including seconds, minutes, hours, date of the month, month, day of the week, and year with leap-year compensation valid up to 2100.
- Digital temperature sensor output with ±3°C accuracy.
- Register for aging trim to maintain accuracy over time.
- Active-low RST output and pushbutton reset debounce input.
- Two time-of-day alarms and programmable square-wave output signal.
- Simple serial I²C interface compatible with most microcontrollers.
- Low power operation to extend battery-backup run time.
- Battery-backup input for continuous timekeeping during power interruptions.
Applications
- Servers and data centers requiring precise timekeeping.
- Telematics and GPS systems.
- Utility power meters and smart grid applications.
- Industrial automation and control systems.
- Medical devices and equipment requiring accurate timing.
Q & A
- What is the primary function of the DS3231SN#? The primary function of the DS3231SN# is to provide a highly accurate real-time clock (RTC) with integrated temperature-compensated crystal oscillator (TCXO) and crystal.
- What are the operating voltage and temperature ranges for the DS3231SN#? The operating voltage is 2.3V to 5.5V, and the operating temperature ranges are commercial (0°C to +70°C) and industrial (-40°C to +85°C).
- How accurate is the DS3231SN# in terms of timekeeping? The DS3231SN# has an accuracy of ±2ppm from 0°C to +40°C and ±3.5ppm from -40°C to +85°C.
- Does the DS3231SN# have a built-in temperature sensor? Yes, the DS3231SN# includes a digital temperature sensor with an accuracy of ±3°C.
- What type of interface does the DS3231SN# use for communication? The DS3231SN# uses an I²C interface with a speed of up to 400kHz.
- Can the DS3231SN# maintain timekeeping during power interruptions? Yes, the DS3231SN# has a battery-backup input to maintain accurate timekeeping during power interruptions.
- What are the dimensions of the DS3231SN# package? The package dimensions are Length: 10.5mm, Width: 7.6mm, and Height: 2.35mm.
- Does the DS3231SN# support alarms and square-wave output? Yes, the DS3231SN# supports two time-of-day alarms and a programmable square-wave output signal.
- Is the DS3231SN# suitable for industrial applications? Yes, the DS3231SN# is suitable for industrial applications due to its wide operating temperature range and robust design.
- What is the purpose of the RST pin on the DS3231SN#? The RST pin provides an external pushbutton function and acts as an indicator of a power-fail event.
