BQ4845S-A4N

Product Overview

Category

The BQ4845S-A4N belongs to the category of integrated circuits (ICs) and specifically falls under the Real-Time Clock (RTC) ICs.

Use

This IC is primarily used for providing accurate timekeeping functionality in various electronic devices such as computers, appliances, industrial equipment, and automotive systems.

Characteristics

• The BQ4845S-A4N offers high precision and reliability in timekeeping.
• It has low power consumption, making it suitable for battery-powered devices.
• The IC supports both 12-hour and 24-hour time formats.
• It includes a built-in crystal oscillator for accurate timekeeping.
• The BQ4845S-A4N features non-volatile memory to retain time and date information during power loss.

Package and Quantity

The BQ4845S-A4N is available in a small form factor package, typically a 16-pin SOIC (Small Outline Integrated Circuit) package. It is commonly sold in reels or tubes containing multiple units.

Specifications

• Supply Voltage: 2.7V to 5.5V
• Time Accuracy: ±2 minutes per month
• Operating Temperature Range: -40°C to +85°C
• Memory Capacity: Typically 64 bytes
• Interface: Serial I2C bus

Pin Configuration

The BQ4845S-A4N has a total of 16 pins, each serving a specific function. Here is the detailed pin configuration:

1. VCC: Power supply input
2. GND: Ground reference
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: Backup battery input for maintaining time during power loss 9-16. NC: No connection (unused pins)

Functional Features

The BQ4845S-A4N offers the following functional features:

1. Real-Time Clock: Provides accurate timekeeping with support for hours, minutes, seconds, and date.
2. Alarm Function: Allows users to set alarms for specific times or events.
3. Power Management: Utilizes low power consumption techniques to extend battery life in portable devices.
4. Non-Volatile Memory: Retains time and date information even when power is lost.
5. I2C Interface: Enables easy integration with microcontrollers and other digital systems.

Advantages and Disadvantages

Advantages

• High precision timekeeping
• Low power consumption
• Compact form factor
• Easy integration with microcontrollers
• Reliable operation

Disadvantages

• Limited memory capacity
• Requires an external crystal oscillator for accurate timekeeping

Working Principles

The BQ4845S-A4N utilizes a combination of an internal crystal oscillator and an external backup battery to maintain accurate timekeeping. The crystal oscillator generates clock pulses that are used to increment the time and date counters within the IC. The non-volatile memory ensures that time and date information is retained even during power loss.

Application Field Plans

The BQ4845S-A4N finds applications in various fields, including:

1. Consumer Electronics: Used in digital clocks, watches, and home appliances.
2. Automotive Systems: Integrated into car dashboards for accurate time display.
3. Industrial Equipment: Employed in industrial automation systems and data loggers.
4. Medical Devices: Incorporated into medical equipment requiring precise timekeeping.
5. Communication Systems: Utilized in network infrastructure equipment for synchronization purposes.

Alternative Models

For those seeking alternative options, the following RTC ICs can be considered:

1. DS1307: Manufactured by Maxim Integrated, offering similar features and I2C interface.
2. PCF8563: Produced by NXP Semiconductors, providing accurate timekeeping with low power consumption.
3. MCP7940N: Developed by Microchip Technology, featuring a wide operating temperature range and battery backup.

These alternative models offer comparable functionality to the BQ4845S-A4N and can be suitable replacements depending on specific requirements.

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