BQ4845YS-A4TR

Product Overview

Category

The BQ4845YS-A4TR 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 BQ4845YS-A4TR offers exceptional accuracy in timekeeping, ensuring reliable performance.
• 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 BQ4845YS-A4TR allows for easy integration into space-constrained electronic designs.
• Wide operating voltage range: It can operate within a broad voltage range, providing flexibility in different applications.

Package

The BQ4845YS-A4TR is available in a surface-mount package, which facilitates easy assembly onto printed circuit boards (PCBs).

Essence

The essence of the BQ4845YS-A4TR lies in its ability to accurately keep track of time and date, even in the absence of external power. It incorporates a built-in backup power source, typically a small lithium coin cell battery, to ensure uninterrupted operation.

Packaging/Quantity

The BQ4845YS-A4TR 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 manufacturer's specifications.

Specifications

• Supply Voltage: 2.7V to 5.5V
• Timekeeping Accuracy: ±1 minute per month
• Operating Temperature Range: -40°C to +85°C
• Backup Battery Voltage: 2.0V to 3.5V
• Interface: I2C (Inter-Integrated Circuit)

Detailed Pin Configuration

The BQ4845YS-A4TR features a standard pin configuration, as follows:

1. VCC: Power supply voltage
2. GND: Ground reference
3. SDA: Serial Data Line (I2C)
4. SCL: Serial Clock Line (I2C)
5. X1: Crystal oscillator input
6. X2: Crystal oscillator output
7. VBAT: Backup battery input
8. IRQ: Interrupt request output

Functional Features

• Real-time clock: The BQ4845YS-A4TR provides accurate timekeeping functions, including hours, minutes, seconds, and calendar information.
• Alarm functionality: It supports programmable alarms to trigger specific events or actions at predefined times.
• Power-fail detection: The IC can detect power failures and automatically switch to backup power, ensuring uninterrupted timekeeping.
• Oscillator calibration: The BQ4845YS-A4TR incorporates an internal oscillator that can be calibrated for enhanced accuracy.

Advantages and Disadvantages

Advantages

• High precision timekeeping
• Low power consumption
• Compact form factor
• Wide operating voltage range
• Integrated backup power source

Disadvantages

• Reliance on external crystal oscillator for accurate timekeeping
• Limited storage capacity for additional data

Working Principles

The BQ4845YS-A4TR utilizes a combination of an internal oscillator and an external crystal oscillator to maintain accurate timekeeping. The internal oscillator is calibrated using the crystal oscillator's frequency, ensuring precise time measurement. In the event of a power failure, the IC seamlessly switches to the backup battery, allowing uninterrupted timekeeping.

Detailed Application Field Plans

The BQ4845YS-A4TR finds applications in various fields, including: 1. Computers and laptops: Providing real-time clock functionality for system timekeeping. 2. Consumer electronics: Incorporating accurate time and date display in devices such as digital cameras, audio players, and smartwatches. 3. Industrial equipment: Enabling precise time synchronization for industrial automation systems and data logging devices. 4. Automotive systems: Facilitating accurate timekeeping for vehicle infotainment systems, navigation units, and instrument clusters.

Detailed and Complete Alternative Models

1. BQ4845YS-A4: Similar to the BQ4845YS-A4TR, but without the reel or tube packaging.
2. BQ4845YS-A4T: Same functionality as BQ4845YS-A4TR, but with a different pin configuration.
3. BQ4845YS-A4TP: Offers additional features like temperature compensation for enhanced accuracy.

Please note that the above alternative models are just a few examples, and there may be other variations available from different manufacturers.

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