BQ3285S-SB2

Overview

The BQ3285S-SB2 is a Real-Time Clock (RTC) module manufactured by Texas Instruments. It integrates a 242x8 Non-Volatile Static RAM (NVSram) for data storage and includes alarm and wake-up capabilities. The device operates with a multiplexed bus interface and supports YY-MM-DD-DD date formats along with 24-hour time formats. It features a backup switching mechanism to ensure continuous operation during power transitions, maintaining timekeeping accuracy in embedded systems requiring precise temporal tracking.

Feature Summary

• Integrated 242x8 NVSRAM for non-volatile data retention
• Hardware alarm and wake-up functionality
• Multiplexed serial interface for communication
• Automatic backup switching for uninterrupted operation

Applications

• Industrial control systems requiring timestamping
• Embedded devices with power loss resilience needs
• Data logging equipment

Procurement Notes

Verify the specific suffix 'SB2' against the official Texas Instruments datasheet to confirm pinout and electrical characteristics, as suffixes often denote package variations or temperature ranges. Ensure compatibility with the target system's voltage levels and interface requirements before procurement.

Selection Notes

Select this component when a combined RTC and NVSRAM solution is required to minimize board space. Compare the 242-byte memory capacity against application data storage needs. Verify that the multiplexed interface aligns with the microcontroller's available I/O resources.

Part Context

This part belongs to the BQ3285 family of real-time clocks from Texas Instruments. It is designed to provide accurate timekeeping and persistent data storage in a single package, reducing the component count compared to discrete RTC and SRAM solutions.

Replacement Considerations

Check for direct substitutes within the BQ3285 series, such as the BQ3285E, ensuring pin compatibility and functional equivalence. Verify that any alternative maintains the same NVSRAM size and interface protocol.