Texas Instruments

BQ3285ESS

BQ3285ESS Description

The BQ3285ESS is a highly integrated Real-Time Clock (RTC) and Calendar IC designed by Texas Instruments. This device is engineered to provide accurate timekeeping and calendar functions in a wide range of electronic systems. Despite being marked as obsolete, the BQ3285ESS remains a robust solution for applications requiring reliable time and date tracking.

The BQ3285ESS operates within a temperature range of 0°C to 70°C, making it suitable for various industrial and consumer environments. It features a surface-mount package, specifically a 24-pin small outline package (24SSOP), which ensures easy integration into compact designs. The device supports a supply voltage range of 4.5V to 5.5V and a battery backup voltage range of 2.5V to 4V, ensuring continuous operation even during power outages.

BQ3285ESS Features

The BQ3285ESS offers several advanced features that set it apart from other RTC ICs. It includes an alarm function that can be programmed to trigger at specific times, making it ideal for scheduling and reminder applications. The device also supports daylight savings adjustments and leap year calculations, ensuring accurate timekeeping over extended periods.

One of the unique features of the BQ3285ESS is its Non-Volatile Static Random Access Memory (NVSRAM) with a capacity of 242 bytes. This memory allows for the storage of additional data, such as system settings or user preferences, which can be retained even when the device is powered off.

The BQ3285ESS provides a square wave output, which can be used for clock synchronization or other timing functions. It supports both 12-hour and 24-hour time formats, offering flexibility in display and user interface design. The device also features a maximum timekeeping current of 300µA at 5V, ensuring low power consumption and extended battery life.

BQ3285ESS Applications

The BQ3285ESS is well-suited for a variety of applications where accurate timekeeping and calendar functions are essential. It is particularly useful in embedded systems, such as industrial controllers, medical devices, and consumer electronics, where reliable time and date tracking are required.

The device's alarm function and NVSRAM make it ideal for applications that require scheduled operations or data logging. For example, in medical devices, the BQ3285ESS can be used to schedule drug delivery or monitor patient data at specific intervals. In industrial settings, it can be employed for time-stamping production data or scheduling maintenance tasks.

The BQ3285ESS's support for daylight savings and leap year adjustments ensures that it remains accurate over long periods, making it suitable for applications that require long-term reliability, such as smart meters or environmental monitoring systems.

Conclusion of BQ3285ESS

In summary, the BQ3285ESS is a versatile and reliable Real-Time Clock and Calendar IC that offers a range of advanced features and benefits. Despite its obsolete status, it remains a valuable component for applications requiring accurate timekeeping, calendar functions, and data storage. Its low power consumption, extensive memory capacity, and support for various time formats make it an excellent choice for a wide range of electronic systems. For designers seeking a robust and feature-rich RTC solution, the BQ3285ESS is a compelling option.