BQ4285S-SB2TR

Product Overview

Category

The BQ4285S-SB2TR belongs to the category of integrated circuits (ICs) specifically designed for real-time clock (RTC) applications.

Use

This product is primarily used to provide accurate timekeeping and calendar functions in various electronic devices, such as computers, consumer electronics, industrial equipment, and automotive systems.

Characteristics

• High precision: The BQ4285S-SB2TR offers exceptional accuracy in timekeeping, ensuring reliable and precise clock synchronization.
• Low power consumption: This IC is designed to operate efficiently with minimal power consumption, making it suitable for battery-powered devices.
• Small form factor: The compact size of the BQ4285S-SB2TR allows for easy integration into space-constrained electronic designs.
• Wide operating voltage range: The product can function within a broad voltage range, enhancing its compatibility with different power supply configurations.

Package

The BQ4285S-SB2TR is available in a small outline package (SOP), which provides mechanical protection and facilitates soldering during the assembly process.

Essence

The essence of the BQ4285S-SB2TR lies in its ability to accurately track time and date information, enabling synchronized operation across multiple devices.

Packaging/Quantity

The BQ4285S-SB2TR is typically packaged in reels or tubes, containing a specific quantity of ICs per package. The exact packaging and quantity may vary depending on the supplier and customer requirements.

Specifications

• Supply voltage: 1.8V - 5.5V
• Operating temperature range: -40°C to +85°C
• Timekeeping accuracy: ±2 minutes per year
• Clock frequency: 32.768 kHz
• I2C interface compatibility

Detailed Pin Configuration

The BQ4285S-SB2TR features a standard pin configuration, as follows:

1. VCC: Power supply voltage
2. GND: Ground reference
3. SDA: Serial data line (I2C interface)
4. SCL: Serial clock line (I2C interface)
5. X1: Crystal oscillator input
6. X2: Crystal oscillator output
7. SQW/INT: Square wave output or interrupt output
8. VBAT: Backup power supply for timekeeping during main power loss

Functional Features

• Real-time clock: The BQ4285S-SB2TR provides accurate timekeeping functionality, including hours, minutes, seconds, day, date, month, and year.
• Alarm function: It supports programmable alarms to trigger specific events or actions at predefined times.
• Oscillator calibration: The IC incorporates an internal calibration mechanism to compensate for crystal oscillator frequency variations, ensuring precise timekeeping.
• Power management: The BQ4285S-SB2TR includes power-saving features, such as low-power modes and automatic switchover between main and backup power sources.

Advantages and Disadvantages

Advantages

• High accuracy in timekeeping
• Low power consumption
• Compact form factor
• Wide operating voltage range
• Integrated power management features

Disadvantages

• Reliance on an external crystal oscillator for clock synchronization
• Limited storage capacity for additional data

Working Principles

The BQ4285S-SB2TR utilizes a combination of an internal real-time clock circuit, a crystal oscillator, and an I2C interface to provide accurate timekeeping. The crystal oscillator generates a stable clock signal, which is used to increment the internal clock registers. The I2C interface allows communication with the host device, enabling time setting, retrieval, and alarm programming.

Detailed Application Field Plans

The BQ4285S-SB2TR finds applications in various fields, including:

1. Computers and laptops: Enables accurate system timekeeping and synchronization.
2. Consumer electronics: Provides precise time display and event scheduling in devices like smart TVs, digital cameras, and audio systems.
3. Industrial equipment: Facilitates time-based control and logging in industrial automation systems.
4. Automotive systems: Supports reliable timekeeping for vehicle infotainment systems, dashboard displays, and navigation units.

Detailed and Complete Alternative Models

1. DS3231 - Real-Time Clock (RTC) IC with integrated temperature compensation.
2. PCF8563 - Low-power RTC IC with alarm functionality and I2C interface.
3. MCP7940N - Highly accurate RTC IC with battery backup and I2C/SPI interfaces.
4. DS1307 - Basic RTC IC with I2C interface and low power consumption.

These alternative models offer similar functionalities to the BQ4285S-SB2TR and can be considered as suitable replacements based on specific application requirements.

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