Maxim Integrated
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DS12885QN+T&R
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DS12885QN+T&R

Product Overview

  • Category: Integrated Circuit
  • Use: Real-Time Clock (RTC)
  • Characteristics: Low power consumption, high accuracy, small package size
  • Package: QFN (Quad Flat No-Lead)
  • Essence: Provides accurate timekeeping and calendar functions
  • Packaging/Quantity: Tape & Reel, 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: 2.0V to 5.5V
  • Battery Backup Current: 1.3μA (typical)

Detailed Pin Configuration

The DS12885QN+T&R has a total of 16 pins:

  1. VCC - Power supply input
  2. GND - Ground
  3. X1 - Crystal oscillator input
  4. X2 - Crystal oscillator output
  5. SQW/OUT - Square wave output or interrupt output
  6. SDA - Serial data input/output
  7. SCL - Serial clock input
  8. RST - Reset input
  9. VBAT - Battery backup input
  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
  • Programmable square wave output frequency
  • Alarm and timer functions
  • Battery backup for timekeeping during power loss
  • I2C interface for easy integration with microcontrollers

Advantages and Disadvantages

Advantages: - Low power consumption extends battery life - High accuracy ensures precise timekeeping - Small package size saves board space - Easy integration with microcontrollers

Disadvantages: - Limited functionality compared to more advanced RTCs - No built-in temperature compensation

Working Principles

The DS12885QN+T&R is based on a quartz crystal oscillator that provides accurate timing signals. It uses an internal counter to keep track of time and date information. The device can be powered by a battery backup during power loss, ensuring continuous timekeeping. Communication with the device is achieved through the I2C interface.

Detailed Application Field Plans

The DS12885QN+T&R is commonly used in various applications, including:

  1. Consumer Electronics: Used in digital cameras, portable media players, and gaming consoles for accurate timekeeping.
  2. Industrial Automation: Integrated into industrial control systems, PLCs, and data loggers to timestamp events and synchronize operations.
  3. Medical Devices: Utilized in medical equipment such as patient monitors and infusion pumps to maintain accurate time records.
  4. Automotive: Integrated into automotive systems for functions like event logging, trip recording, and synchronization with GPS.

Detailed and Complete Alternative Models

  1. DS3231 - Highly accurate RTC with temperature compensation and alarm features.
  2. PCF8563 - Low-power RTC with I2C interface and battery backup capability.
  3. MCP7940N - Real-time clock/calendar with SRAM and EEPROM for additional data storage.

These alternative models offer similar functionalities to the DS12885QN+T&R and can be considered as alternatives based on specific requirements.

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Liste 10 almindelige spørgsmål og svar relateret til anvendelsen af DS12885QN+T&R i tekniske løsninger

Sure! Here are 10 common questions and answers related to the application of DS12885QN+T&R in technical solutions:

  1. Q: What is DS12885QN+T&R? A: DS12885QN+T&R is a real-time clock (RTC) module manufactured by Maxim Integrated. It provides accurate timekeeping and calendar functions.

  2. Q: How does DS12885QN+T&R connect to a microcontroller? A: DS12885QN+T&R can be connected to a microcontroller using an I2C interface. The microcontroller communicates with the RTC module to read and set the time and date.

  3. Q: Can DS12885QN+T&R operate on its own without a microcontroller? A: Yes, DS12885QN+T&R has a built-in battery backup that allows it to operate independently. It can keep track of time even when not connected to a microcontroller.

  4. Q: What is the accuracy of DS12885QN+T&R? A: DS12885QN+T&R has a typical accuracy of ±2 minutes per month. However, this accuracy can vary depending on factors such as temperature and power supply voltage.

  5. Q: Can DS12885QN+T&R be used in battery-powered devices? A: Yes, DS12885QN+T&R is designed to be used in low-power applications. Its low power consumption makes it suitable for battery-powered devices.

  6. Q: Does DS12885QN+T&R have any alarm functionality? A: Yes, DS12885QN+T&R has two programmable alarms. These alarms can be set to trigger at specific times or dates, allowing the RTC module to wake up a microcontroller or perform other actions.

  7. Q: Can DS12885QN+T&R be used in industrial applications? A: Yes, DS12885QN+T&R is suitable for industrial applications. It has a wide operating temperature range and can withstand harsh environments.

  8. Q: Does DS12885QN+T&R have non-volatile memory? A: Yes, DS12885QN+T&R has 114 bytes of non-volatile RAM (NVRAM). This memory can be used to store user data or configuration settings.

  9. Q: Can DS12885QN+T&R be used in automotive applications? A: Yes, DS12885QN+T&R is automotive-grade and can be used in automotive applications. It meets the necessary quality and reliability standards.

  10. Q: Are there any software libraries available for interfacing with DS12885QN+T&R? A: Yes, Maxim Integrated provides software libraries and example code for various microcontrollers to facilitate the integration of DS12885QN+T&R into different systems.

Please note that these answers are general and may vary depending on specific requirements and use cases.