DS1284QN

Product Overview

• Category: Integrated Circuit (IC)
• Use: Real-time clock (RTC) with Non-Volatile RAM (NVRAM)
• Characteristics:
  • Combines a clock/calendar function with a non-volatile RAM
  • Provides accurate timekeeping and data storage capabilities
  • Low power consumption
  • Small form factor
• Package: Quad Flat Package (QFP)
• Essence: Integration of clock/calendar and NVRAM functionalities in a single chip
• Packaging/Quantity: Available in tape and reel packaging, quantity per reel varies based on manufacturer specifications

Specifications

• Clock/Calendar:
  • Time format: 24-hour or 12-hour (AM/PM)
  • Accuracy: ±2 minutes per month at 25°C
  • Leap year compensation up to 2100
• Non-Volatile RAM:
  • Capacity: 128 bytes
  • Data retention: Minimum 10 years
• Operating Voltage: 2.7V to 5.5V
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The DS1284QN has a total of 28 pins. The pin configuration is as follows:

1. VCC
2. GND
3. X1
4. X2
5. SQW/INT
6. RST
7. A0
8. A1
9. A2
10. A3
11. A4
12. A5
13. A6
14. A7
15. CE
16. D0
17. D1
18. D2
19. D3
20. D4
21. D5
22. D6
23. D7
24. VBAT
25. NC
26. NC
27. NC
28. NC

Functional Features

• Real-time clock with calendar function
• Non-volatile RAM for data storage
• Battery backup support (VBAT pin)
• Programmable square wave output (SQW/INT pin)
• Power-saving mode to reduce power consumption
• Automatic leap year compensation
• 12-hour or 24-hour time format selection

Advantages and Disadvantages

Advantages: - Integration of clock/calendar and NVRAM in a single chip saves board space - Accurate timekeeping and reliable data storage - Low power consumption extends battery life - Easy to interface with microcontrollers and other digital systems

Disadvantages: - Limited non-volatile RAM capacity (128 bytes) - Relatively higher cost compared to standalone RTC or NVRAM chips - Requires an external battery for backup operation

Working Principles

The DS1284QN combines a real-time clock circuit with a non-volatile RAM. The clock circuit generates accurate timing signals, while the NVRAM provides persistent data storage even when power is lost. The chip operates using an external power supply and can be backed up by a battery connected to the VBAT pin. The clock/calendar function keeps track of time, date, and leap years, while the NVRAM allows users to store critical data that needs to be retained across power cycles.

Detailed Application Field Plans

The DS1284QN finds applications in various fields, including:

1. Embedded Systems: Used as a timekeeping and data storage solution in embedded systems such as industrial automation, medical devices, and consumer electronics.
2. Security Systems: Integrated into security systems to maintain accurate time stamps and store event logs.
3. Communication Equipment: Employed in networking devices, routers, and switches to synchronize time and store configuration data.
4. Automotive Electronics: Used in automotive applications for tasks like event logging, trip data storage, and timekeeping.
5. Power Management: Integrated into power management systems to record energy consumption data and monitor power usage patterns.

Detailed and Complete Alternative Models

1. DS1287A: Similar to DS1284QN but with additional features like a battery-backed watchdog timer.
2. DS1307: Standalone real-time clock module with I2C interface and larger NVRAM capacity.
3. MCP7940N: Real-time clock/calendar with integrated temperature sensor and I2C/SPI interface.
4. PCF8563: Low-power real-time clock module with alarm function and I2C interface.

(Note: This is not an exhaustive list; there are several alternative models available in the market.)

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