Texas Instruments

BQ4285LS

BQ4285LS Description

The BQ4285LS is a highly integrated Real-Time Clock (RTC) with 114 bytes of Non-Volatile Static Random Access Memory (NVSRAM) from Texas Instruments. This device is designed for surface mount applications and is housed in a 24-SOP package. It operates within a supply voltage range of 2.7V to 3.6V and supports a battery backup supply voltage of 2.4V to 4V. The BQ4285LS features a parallel interface, making it suitable for systems requiring direct memory access and high-speed data transfer.

The BQ4285LS is equipped with advanced timekeeping capabilities, supporting both 12-hour and 24-hour time formats (HH:MM:SS). It includes features such as an alarm function, daylight savings time adjustment, leap year compensation, and a square wave output. These features make it an ideal solution for applications requiring precise timekeeping and reliable data storage.

BQ4285LS Features

• Clock/Calendar Functionality: The BQ4285LS provides comprehensive timekeeping capabilities, including hours, minutes, seconds, day, date, month, and year with leap year compensation.
• Alarm Function: The device includes an alarm feature that can be programmed to trigger at specific times, making it suitable for applications requiring scheduled events or reminders.
• Daylight Savings Time Adjustment: The BQ4285LS supports automatic adjustment for daylight savings time, ensuring accurate timekeeping throughout the year.
• NVSRAM: The 114 bytes of NVSRAM allow for the storage of critical data that must be retained even in the event of power loss.
• Square Wave Output: The device offers a square wave output, which can be used for clocking other devices or systems.
• Wide Operating Voltage Range: The BQ4285LS operates within a supply voltage range of 2.7V to 3.6V, with a battery backup supply voltage range of 2.4V to 4V, providing flexibility in power supply options.
• Parallel Interface: The parallel interface allows for high-speed data transfer and direct memory access, making it suitable for systems requiring fast data handling.
• Moisture Sensitivity Level (MSL) 2 (1 Year): The device is rated for a moisture sensitivity level of 2, ensuring reliability in various environmental conditions.

BQ4285LS Applications

The BQ4285LS is ideal for a wide range of applications that require precise timekeeping and reliable data storage. Some specific use cases include:

• Embedded Systems: The BQ4285LS can be used in embedded systems where accurate timekeeping and data retention are critical, such as in industrial control systems, medical devices, and automotive electronics.
• Consumer Electronics: The device is suitable for consumer electronics applications, such as digital cameras, smart meters, and home automation systems, where reliable timekeeping and data storage are essential.
• Telecommunications: The BQ4285LS can be used in telecommunications equipment for logging events, scheduling maintenance, and ensuring accurate time synchronization.
• Data Logging: The NVSRAM feature makes the BQ4285LS an excellent choice for data logging applications, where critical data must be retained even in the event of power loss.

Conclusion of BQ4285LS

The BQ4285LS from Texas Instruments is a versatile and reliable RTC with NVSRAM, offering a comprehensive set of features for precise timekeeping and data storage. Its wide operating voltage range, parallel interface, and advanced timekeeping capabilities make it an ideal solution for a variety of applications. While the product is now obsolete, its unique features and performance benefits continue to make it a valuable component for systems requiring accurate timekeeping and reliable data retention.