BQ4845YS-A4G4 Product Details

Product Specifications

The BQ4845YS-A4G4 is a comprehensive Real-Time Clock (RTC) integrated circuit with a full complement of features for timekeeping and system management in complex electronic systems. It incorporates a battery-backed non-volatile (NV) RAM, clock calendar, programmable alarms, and a watchdog timer. Its primary specifications include:

• Timekeeping Accuracy: Equipped with a precision crystal oscillator for accurate timekeeping.

• Power Supply Voltage: Designed for operation with a supply voltage of 4.5V to 5.5V, perfect for 5V logic systems.

• Temperature Range: Operating temperature range extends from -40°C to +85°C.

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

• Interface: Offers a straightforward parallel interface for easy communication with microprocessors.

• Package Type: Provided in a 28-pin SOP package, facilitating integration into a variety of designs.

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

Product Introduction

The BQ4845YS-A4G4 is engineered for applications requiring accurate timekeeping, data integrity, and system stability through power disturbances. Its integrated NV RAM backed by a battery ensures that data is preserved during power outages, making it invaluable for critical data logging applications. Programmable alarms and the watchdog timer support complex system requirements, offering both flexibility and reliability in operation. This RTC is an ideal solution for managing time and data across a broad range of applications, from computing and telecommunications to industrial control systems.

Application Scope

This RTC module is versatile, finding utility in a broad spectrum of sectors:

• Computing: Essential for desktops, servers, and networking equipment, ensuring accurate system time and data preservation.

• Industrial Systems: Perfect for use in data loggers, automation systems, and other industrial applications that demand reliable timekeeping and data integrity.

• Telecommunications: Useful in network infrastructure for timestamping, logging, and monitoring system reliability.

• Medical Equipment: Critical in medical devices where precise timekeeping and data storage are necessary for diagnostics and patient care.

• Energy Management: Applicable in power grid equipment and smart meters for accurate timestamping and event logging.

Frequently Asked Questions

Q: How does the BQ4845YS-A4G4 ensure data integrity during power failures?

A: It automatically switches to battery backup to maintain the clock and preserve NV RAM contents, ensuring uninterrupted operation and data integrity.

Q: What is the function of the programmable alarms in the BQ4845YS-A4G4?

A: Programmable alarms can be set to trigger on specific dates, times, or intervals, facilitating event scheduling, reminders, or system checks without the need for constant CPU intervention.

Q: Can the watchdog timer be disabled in the BQ4845YS-A4G4?

A: Yes, the watchdog timer can typically be enabled or disabled and configured according to specific system requirements, offering flexibility in system design.