DS1689S

Product Overview

• Category: Integrated Circuit
• Use: Real-Time Clock (RTC)
• Characteristics: Low power consumption, high accuracy, small package size
• Package: SOP-8 (Small Outline Package)
• Essence: The DS1689S is a real-time clock IC that provides accurate timekeeping and calendar functions.
• Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel.

Specifications

• Supply Voltage: 2.7V to 5.5V
• Timekeeping Accuracy: ±2 minutes per month at 25°C
• Operating Temperature Range: -40°C to +85°C
• Battery Backup Voltage: 1.8V to 5.5V
• I2C Bus Interface: Supports standard and fast mode (100kHz and 400kHz)

Pin Configuration

The DS1689S has an SOP-8 package with the following pin configuration:

┌───┬───┐ │ 1 │ 2 │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ 3 │ 4 │ └───┴───┘

1. VCC: Power supply input
2. GND: Ground
3. SDA: Serial data line for I2C communication
4. SCL: Serial clock line for I2C communication

Functional Features

• Real-time clock with calendar functions
• Automatic leap year compensation
• Alarm function with programmable interrupt output
• Battery backup for timekeeping during power loss
• 32-byte general-purpose RAM
• Programmable square wave output

Advantages and Disadvantages

Advantages: - Low power consumption - High accuracy timekeeping - Small package size for space-constrained applications - Battery backup ensures uninterrupted operation during power loss

Disadvantages: - Limited RAM capacity (32 bytes) - Requires an external crystal oscillator for accurate timekeeping

Working Principles

The DS1689S utilizes an internal oscillator and a 32.768kHz crystal to maintain accurate timekeeping. It communicates with the host microcontroller through the I2C bus interface, allowing for easy integration into various systems. The battery backup feature ensures that the clock continues to operate even when the main power supply is disconnected.

Application Field Plans

The DS1689S is commonly used in applications that require precise timekeeping and calendar functions. Some of the potential application fields include:

1. Consumer Electronics: Clocks, watches, and timers
2. Industrial Automation: Programmable logic controllers (PLCs), data loggers
3. Automotive: Dashboard clocks, event recorders
4. Medical Devices: Patient monitoring systems, infusion pumps
5. Security Systems: Access control panels, surveillance cameras

Alternative Models

• DS3231: Offers higher timekeeping accuracy and additional features such as temperature compensation.
• PCF8563: Provides similar timekeeping functionality with a different pin configuration and package type.
• MCP7940N: Features a larger RAM capacity and supports battery-backed SRAM.

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