DS1688S

Product Overview

• Category: Integrated Circuit (IC)
• Use: Real-Time Clock (RTC) with Non-Volatile RAM (NVRAM)
• Characteristics:
  • Combines clock and memory functions in a single chip
  • Provides accurate timekeeping and non-volatile storage
  • Low power consumption
• Package: DIP (Dual In-line Package)
• Essence: Integration of clock and memory functions in a compact package
• Packaging/Quantity: Available in tubes or reels, quantity depends on supplier

Specifications

• Clock Accuracy: ±2 minutes per month
• Supply Voltage: 2.7V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Memory Size: 256 bytes
• Data Retention: Over 10 years
• Serial Interface: I²C (Inter-Integrated Circuit)

Detailed Pin Configuration

The DS1688S has a total of 16 pins, which are assigned as follows:

1. VCC: Power supply voltage input
2. GND: Ground connection
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 pin
6. X1: Crystal oscillator input
7. X2: Crystal oscillator output
8. NC: No connection
9. NC: No connection
10. NC: No connection
11. NC: No connection
12. NC: No connection
13. NC: No connection
14. NC: No connection
15. NC: No connection
16. NC: No connection

Functional Features

• Real-time clock with calendar functionality
• Non-volatile RAM for data storage
• Automatic leap year compensation
• Alarm function with programmable interrupt output
• Battery backup for continuous operation during power loss

Advantages and Disadvantages

Advantages: - Integration of clock and memory functions saves board space - Accurate timekeeping with low power consumption - Non-volatile RAM ensures data retention during power loss

Disadvantages: - Limited memory size (256 bytes) - Clock accuracy may not be suitable for highly precise applications

Working Principles

The DS1688S utilizes a crystal oscillator to generate accurate clock signals. It incorporates a real-time clock circuit that keeps track of time, including leap years. The non-volatile RAM allows the storage of important data even when the power is disconnected. The IC can be powered by a battery backup to ensure continuous operation during power outages.

Detailed Application Field Plans

The DS1688S is commonly used in various applications, including:

1. Embedded systems requiring accurate timekeeping and data storage
2. Industrial automation systems for event logging and scheduling
3. Consumer electronics such as digital cameras and printers for timestamping
4. Automotive applications for recording vehicle usage and maintenance history

Detailed and Complete Alternative Models

1. DS1307: Similar real-time clock module with I²C interface and larger memory capacity.
2. PCF8563: Real-time clock and calendar module with I²C interface and additional features like timer and alarm functions.
3. MCP7940N: Integrated RTC and NVRAM module with I²C interface and enhanced accuracy.

(Note: This list is not exhaustive and other alternative models may exist.)

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