DS12885S

Product Overview

Category: Integrated Circuit (IC)

Use: Real-Time Clock (RTC) Module

Characteristics: - Low power consumption - Accurate timekeeping - Non-volatile memory for data storage - Serial interface for communication with microcontrollers - Battery backup for continuous operation during power loss

Package: Small Outline Integrated Circuit (SOIC)

Essence: The DS12885S is a real-time clock module that provides accurate timekeeping and non-volatile memory for data storage. It is commonly used in electronic devices that require precise timekeeping, such as computers, industrial automation systems, and consumer electronics.

Packaging/Quantity: The DS12885S is typically sold in reels or tubes containing multiple units.

Specifications

• Supply Voltage: 2.0V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Timekeeping Accuracy: ±2 minutes per month at 25°C
• Data Retention: Over 10 years
• Serial Interface: I²C (Inter-Integrated Circuit)
• Memory Size: 114 bytes of non-volatile RAM

Detailed Pin Configuration

The DS12885S has a total of 16 pins. The pin configuration is as follows:

1. VCC - Power supply voltage
2. GND - Ground
3. SDA - Serial data line for I²C communication
4. SCL - Serial clock line for I²C communication
5. SQW/INT - Square wave output or interrupt output
6. RST - Reset input
7. X1 - Crystal oscillator input
8. X2 - Crystal oscillator output
9. NC - No connection
10. VBAT - Battery backup voltage
11. VBAT - Battery backup voltage
12. VBAT - Battery backup voltage
13. VBAT - Battery backup voltage
14. VBAT - Battery backup voltage
15. VBAT - Battery backup voltage
16. VBAT - Battery backup voltage

Functional Features

• Real-time clock with calendar functionality
• Battery backup for continuous operation during power loss
• Alarm and interrupt functions
• Programmable square wave output
• Non-volatile memory for data storage
• Automatic leap year compensation
• Power-saving mode for low power consumption

Advantages and Disadvantages

Advantages: - Accurate timekeeping - Non-volatile memory for data retention - Low power consumption - Wide operating voltage range - Compact package size

Disadvantages: - Limited memory size (114 bytes) - Requires an external crystal oscillator for timekeeping accuracy

Working Principles

The DS12885S utilizes a quartz crystal oscillator to generate precise clock signals. It communicates with microcontrollers through the I²C serial interface, allowing for easy integration into various electronic systems. The battery backup ensures that the clock continues to operate even during power outages, while the non-volatile memory retains important data.

Detailed Application Field Plans

The DS12885S is commonly used in the following applications:

1. Personal computers and servers for accurate timekeeping and system event logging.
2. Industrial automation systems for synchronizing processes and scheduling tasks.
3. Consumer electronics such as digital cameras and audio/video recorders for timestamping events.
4. Medical devices for time-sensitive operations and data logging.
5. Automotive systems for maintaining accurate time and date information.

Detailed and Complete Alternative Models

1. DS3231 - Real-Time Clock Module with higher timekeeping accuracy and temperature compensation.
2. PCF8563 - Real-Time Clock Module with integrated temperature sensor and alarm functions.
3. MCP7940N - Real-Time Clock Module with battery switchover circuitry and power-fail timestamp.

These alternative models offer similar functionality to the DS12885S but may have additional features or improved specifications.

Word count: 498 words