PCA8561BHN/AY

Product Overview

Category

The PCA8561BHN/AY belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used for real-time clock (RTC) applications.

Characteristics

• The PCA8561BHN/AY is a highly accurate and reliable RTC IC.
• It offers low power consumption, making it suitable for battery-powered devices.
• The IC has a wide operating voltage range, allowing it to be used in various electronic systems.
• It provides precise timekeeping and calendar functions.
• The PCA8561BHN/AY supports both 12-hour and 24-hour time formats.

Package

The PCA8561BHN/AY is available in a compact and industry-standard package.

Essence

The essence of the PCA8561BHN/AY lies in its ability to provide accurate timekeeping and calendar functions in a low-power and compact form factor.

Packaging/Quantity

This IC is typically packaged in reels or tubes, with a quantity of around 2500 units per reel/tube.

Specifications

• Supply Voltage: 1.8V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Clock Frequency: 32.768 kHz
• Time Accuracy: ±3 ppm at 25°C
• I2C Bus Interface: Compatible with standard I2C protocol
• Battery Backup: Supports battery backup for continuous timekeeping during power loss

Detailed Pin Configuration

The PCA8561BHN/AY features a total of 20 pins, each serving a specific function. The pin configuration is as follows:

1. VDD: Power supply input
2. GND: Ground connection
3. SDA: Serial data line for I2C communication
4. SCL: Serial clock line for I2C communication
5. INT: Interrupt output pin
6. X1: Crystal oscillator input
7. X2: Crystal oscillator output
8. TEST: Test mode pin (for factory testing)
9. VBAT: Battery backup input
10. SQW/OUT: Square wave output pin

Functional Features

• Real-time clock with calendar functions
• Automatic leap year compensation
• Alarm and timer functions
• Programmable square wave output
• Power-on reset and low voltage detection
• 24-hour or 12-hour time format selection
• I2C bus interface for easy integration with microcontrollers

Advantages and Disadvantages

Advantages

• High accuracy and reliability in timekeeping
• Low power consumption, suitable for battery-powered devices
• Wide operating voltage range for versatile applications
• Compact form factor for space-constrained designs
• Easy integration with microcontrollers through the I2C interface

Disadvantages

• Limited availability of alternative models with similar features
• Relatively higher cost compared to some other RTC ICs

Working Principles

The PCA8561BHN/AY utilizes an internal crystal oscillator to generate a precise 32.768 kHz clock signal. This clock signal is used as a reference for the real-time clock and calendar functions. The IC communicates with external microcontrollers using the I2C bus protocol, allowing for easy configuration and data exchange.

During normal operation, the PCA8561BHN/AY keeps track of time and date, compensating for leap years automatically. It also provides alarm and timer functionalities, generating interrupt signals when programmed events occur. In case of a power loss, the IC can be connected to a backup battery to ensure continuous timekeeping.

Detailed Application Field Plans

The PCA8561BHN/AY finds applications in various fields, including:

1. Consumer Electronics: Used in digital clocks, watches, and home appliances with timekeeping features.
2. Automotive: Integrated into car dashboard displays, infotainment systems, and navigation devices.
3. Industrial Automation: Employed in programmable logic controllers (PLCs), data loggers, and industrial timers.
4. Medical Devices: Utilized in medical equipment requiring accurate timekeeping, such as patient monitors and infusion pumps.
5. Internet of Things (IoT): Integrated into IoT devices for synchronized timekeeping and scheduling.

Detailed and Complete Alternative Models

While the PCA8561BHN/AY is a reliable RTC IC, alternative models with similar features include:

1. DS3231: Manufactured by Maxim Integrated, offering high accuracy and temperature compensation.
2. PCF8523: Produced by NXP Semiconductors, providing low power consumption and I2C interface compatibility.
3. MCP7940N: Developed by Microchip Technology, featuring battery backup and alarm functions.

These alternative models offer comparable functionalities and can be considered based on specific application requirements.

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