BQ4845S-A4NG4 Product Details

Product Specifications

The BQ4845S-A4NG4 is a comprehensive Real-Time Clock (RTC) solution, integrating clock/calendar functions, a programmable alarm, and battery-backed non-volatile (NV) RAM in a single chip. Designed for precision and reliability, it includes the following key specifications:

• Timekeeping Accuracy: Utilizes a precision crystal oscillator for accurate time and date maintenance.

• Power Supply Voltage: Designed to operate over a supply voltage range of 4.5V to 5.5V, suitable for 5V logic systems.

• Temperature Range: Operational across a temperature range of -40°C to +85°C, ensuring reliability under varying environmental conditions.

• Memory: Features integrated battery-backed NV RAM for secure data storage during power loss.

• Interface: Equipped with a parallel interface for easy integration with microprocessors.

• Package Type: Available in a 28-pin SOP package, facilitating easy mounting and compatibility with various board layouts.

• Additional Features: Offers power-fail detection, automatic switch to battery backup, programmable alarms, and a watchdog timer for enhanced system management and reliability.

Product Introduction

The BQ4845S-A4NG4 RTC is engineered for applications that demand accurate timekeeping, secure data retention, and robust system management capabilities. Its battery-backed NV RAM is crucial for applications where preserving data integrity during power interruptions is vital. The chip's programmable alarm and watchdog timer features support complex system requirements, offering flexibility and enhanced reliability. This makes the BQ4845S-A4NG4 an ideal choice for a wide range of applications, from computing and telecommunications to industrial control systems and medical devices.

Application Scope

This RTC chip is utilized across a diverse set of industries:

• Computing: Essential in personal computers, servers, and networking devices for accurate timekeeping and system integrity.

• Industrial Automation: Ideal for control systems, monitoring equipment, and data loggers requiring dependable operation and data preservation.

• Telecommunications: Used in network infrastructure for precise time-stamping, logging, and equipment health monitoring.

• Medical Equipment: Critical for time-sensitive diagnostics and patient monitoring systems, ensuring data accuracy and reliability.

• Automotive Systems: Suitable for in-vehicle electronics that rely on accurate timing and data logging, such as navigation and telematics systems.

Frequently Asked Questions

Q: How does the BQ4845S-A4NG4 handle power interruptions?

A: It automatically switches to its battery backup, maintaining clock operations and preserving NV RAM contents to ensure uninterrupted functionality and data integrity.

Q: Can the programmable alarms trigger system actions?

A: Yes, the programmable alarms can be set for specific times and dates, enabling scheduled events or system checks without requiring constant CPU oversight.

Q: Is the watchdog timer adjustable on the BQ4845S-A4NG4?

A: The watchdog timer can typically be configured or disabled based on specific application needs, adding an extra layer of flexibility in system design.