DS12885QN/T&R

Product Overview

• Category: Integrated Circuit (IC)
• Use: Real-Time Clock (RTC) Module
• Characteristics:
  • Low power consumption
  • Small form factor
  • High accuracy timekeeping
  • Non-volatile memory for data storage
• Package: QFN (Quad Flat No-leads)
• Essence: Provides real-time clock functionality for various electronic devices
• Packaging/Quantity: Tape and Reel, quantity varies based on customer requirements

Specifications

• Supply Voltage: 2.97V to 5.5V
• Timekeeping Accuracy: ±2 minutes per month at 25°C
• Operating Temperature Range: -40°C to +85°C
• Battery Backup Voltage: 2.0V to 5.5V
• Memory: 114 Bytes of Non-volatile RAM
• Interface: I2C (Inter-Integrated Circuit)

Detailed Pin Configuration

The DS12885QN/T&R has a total of 16 pins arranged 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 / Interrupt output
6. X1 - Crystal oscillator input
7. X2 - Crystal oscillator output
8. VBAT - Battery backup voltage input
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
• Automatic leap year compensation
• Alarm and timer functions
• Battery backup for continuous timekeeping during power loss
• Programmable square wave output
• I2C interface for easy integration with microcontrollers

Advantages and Disadvantages

Advantages: - Low power consumption extends battery life - Small form factor allows for compact designs - High accuracy timekeeping ensures precise timing requirements - Non-volatile memory retains data during power loss

Disadvantages: - Limited non-volatile RAM capacity (114 Bytes) - Requires an external crystal oscillator for clock accuracy

Working Principles

The DS12885QN/T&R utilizes a combination of an internal oscillator, counters, and registers to keep track of time. The crystal oscillator provides a stable clock signal, which is divided and processed by the internal circuitry. The real-time clock continuously updates the time and date information based on the oscillator's frequency. The non-volatile RAM stores critical data, such as alarm settings and system configuration, ensuring data integrity during power interruptions.

Detailed Application Field Plans

The DS12885QN/T&R finds applications in various electronic devices that require accurate timekeeping and calendar functionality. Some common application fields include:

1. Consumer Electronics: Digital watches, clocks, and timers
2. Industrial Automation: Programmable logic controllers (PLCs), data loggers
3. Automotive: On-board computers, dashboard displays
4. Medical Devices: Patient monitoring systems, infusion pumps
5. Communication Systems: Network switches, routers, base stations

Detailed and Complete Alternative Models

1. DS3231 - Real-Time Clock Module with higher timekeeping accuracy and additional features.
2. PCF8563 - Low-power Real-Time Clock Module with I2C interface.
3. MCP7940N - Real-Time Clock Module with battery backup and integrated temperature sensor.

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

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