Texas Instruments

BQ3285LFSS-A1TRG4

BQ3285LFSS-A1TRG4 Description

The BQ3285LFSS-A1TRG4 is a highly integrated Real-Time Clock (RTC) and Calendar IC designed by Texas Instruments. This device is part of the Clock/Timing ICs category and is packaged in a 24-lead SSOP (Small Outline Package) with a Tape & Reel (TR) format, suitable for surface mount applications. Although it is now marked as obsolete, the BQ3285LFSS-A1TRG4 remains a robust solution for applications requiring precise timekeeping and calendar functions.

Key technical specifications include an operating temperature range of 0°C to 70°C, making it suitable for a variety of industrial and consumer applications. The device operates on a supply voltage of 2.7V to 5.5V, with a battery backup supply voltage range of 2.4V to 4V, ensuring reliable operation even during power outages. The timekeeping current is maximized at 100µA at 3V, which is remarkably low, contributing to extended battery life.

The BQ3285LFSS-A1TRG4 features a memory size of 242 bytes, providing ample space for storing critical data. It supports a parallel interface, facilitating straightforward integration with various microcontrollers and systems. The time format is configurable in both 12-hour and 24-hour formats (HH:MM:SS), offering flexibility to meet different user preferences and application requirements.

BQ3285LFSS-A1TRG4 Features

The BQ3285LFSS-A1TRG4 stands out due to its comprehensive set of features that enhance its functionality and versatility:

• Alarm Functionality: The device includes an alarm feature that can be programmed to trigger at specific times, making it ideal for applications requiring scheduled events or reminders.
• Daylight Savings and Leap Year Support: The RTC automatically adjusts for Daylight Savings Time and Leap Year, ensuring accurate timekeeping throughout the year without manual intervention.
• NVSRAM: The inclusion of Non-Volatile Static Random Access Memory (NVSRAM) ensures that critical data is retained even when power is lost, providing a reliable storage solution.
• Square Wave Output: The device offers a square wave output, which can be used for clocking other components or generating timing signals.
• Compliance and Standards: The BQ3285LFSS-A1TRG4 is REACH unaffected and RoHS3 compliant, adhering to stringent environmental and safety standards. It also carries an ECCN (Export Control Classification Number) of EAR99, simplifying export and compliance processes.

BQ3285LFSS-A1TRG4 Applications

The BQ3285LFSS-A1TRG4 is well-suited for a wide range of applications where precise timekeeping and calendar functions are essential:

• Consumer Electronics: Ideal for devices such as digital clocks, home automation systems, and smart appliances that require accurate time and date tracking.
• Industrial Control Systems: Useful in manufacturing and industrial settings where scheduling and time-based operations are critical.
• Medical Devices: Suitable for medical equipment that requires reliable timekeeping for monitoring and logging patient data.
• Telecommunications: Beneficial in telecom systems for logging call times and managing network operations.

Conclusion of BQ3285LFSS-A1TRG4

Despite its obsolete status, the BQ3285LFSS-A1TRG4 remains a reliable and feature-rich RTC and Calendar IC. Its low power consumption, extensive memory, and advanced features such as alarm, Daylight Savings, and Leap Year support make it a valuable component for applications requiring precise and reliable timekeeping. The device's compliance with environmental and safety standards further enhances its appeal. For existing systems or legacy designs, the BQ3285LFSS-A1TRG4 continues to offer a robust solution, ensuring accurate time and date management with minimal power consumption.