DS14285S+ Real-Time Clock

Updated: 2026-09-15

Overview

The DS14285S+ is a real-time clock (RTC) IC designed for applications requiring precise timekeeping. It is commonly used in embedded systems, IoT devices, and industrial equipment where maintaining accurate time is critical. The device integrates a clock/calendar, alarm functions, and non-volatile storage for configuration data. With its low power consumption, the DS14285S+ is ideal for battery-powered applications. It supports I2C communication, making it easy to interface with microcontrollers. The RTC also includes a battery backup input to ensure continuous operation during power outages.

Structure and Working Principle

The DS14285S+ consists of a quartz crystal oscillator, timekeeping registers, and an I2C interface. The oscillator provides the timing reference, while the registers store the current time and date. The I2C interface allows communication with a host microcontroller for time updates and readings. When powered, the RTC maintains time independently of the host system. If main power is lost, an external battery can keep the clock running. The device includes temperature compensation to improve accuracy over varying environmental conditions.

Key Features

The DS14285S+ offers several notable features, including a wide operating voltage range (2.97V to 5.5V) and ultra-low power consumption in battery backup mode. Its integrated oscillator reduces the need for external components, simplifying PCB design. The RTC provides seconds, minutes, hours, day, date, month, and year information with automatic leap-year compensation. It also includes programmable alarms and a square-wave output. The device is available in a compact SOIC package, suitable for space-constrained applications.

Application Areas

The DS14285S+ is widely used in embedded systems such as smart meters, medical devices, and industrial controllers. It is also found in consumer electronics like digital cameras, set-top boxes, and home automation systems. In industrial settings, the RTC ensures accurate timestamping for data logging and event recording. Its reliability and low power consumption make it a preferred choice for IoT devices that operate on battery power for extended periods.

Maintenance and Precautions

To ensure optimal performance, the DS14285S+ should be handled with proper ESD precautions during installation. The backup battery should be selected based on the required backup duration and environmental conditions. Regularly check the battery voltage to prevent data loss during power failures. Avoid exposing the device to extreme temperatures beyond its specified operating range, as this may affect timekeeping accuracy.

B2B Procurement Guide

When sourcing the DS14285S+, verify the supplier's authenticity to avoid counterfeit components. Consider purchasing from authorized distributors to ensure quality and warranty support. Bulk orders may qualify for volume discounts, but lead times can vary. Evaluate the need for additional features like temperature compensation or extended battery backup. Compare pricing across multiple vendors, but prioritize reliability over cost savings for critical applications.