BQ32002D

Overview

The BQ32002D is a low-power microprocessor peripheral real-time clock (RTC) and calendar manufactured by Texas Instruments. It provides timekeeping and a 100-year calendar with alarm functions, powered by a backup battery. The device features an I²C interface for communication and includes 114 bytes of general-purpose non-volatile memory. Key electrical parameters include a supply voltage range of 3V to 3.6V for main power and 1.4V to 3.6V for the battery input. The maximum current consumption during timing operation is 100µA at 3.3V. It operates within a temperature range of -40°C to 85°C and is housed in an 8-SOIC package.

Feature Summary

• Integrated 100-year calendar and real-time clock with HH:MM:SS (24-hour) time format and YY-MM-DD-dd date format.
• Includes 114 bytes of general-purpose non-volatile RAM for data storage.
• Supports three maskable interrupt sources and a square wave output signal.
• Features a trickle charger for maintaining backup battery charge.

Applications

• Microprocessor systems requiring precise timekeeping and calendar functions.
• Data logging devices needing non-volatile memory for timestamping.
• Battery-powered embedded systems with low power consumption requirements.

Procurement Notes

Verify the specific suffix 'D' indicates the 8-SOIC package variant when ordering. Confirm that the design supports the required I²C bus speeds and voltage levels compatible with the 3V-3.6V operating range. Ensure the application circuit includes a suitable backup battery capable of sustaining the 1.4V-3.6V input range during primary power loss.

Selection Notes

Select this component when a dedicated RTC with integrated non-volatile memory is required to reduce board space. Compare against the BQ32000 series for pin compatibility and feature parity. Verify that the 8-SOIC package fits the PCB footprint constraints and that the thermal performance meets the -40°C to 85°C operational environment specifications.

Part Context

The BQ32002D belongs to the BQ32000 family of real-time clocks from Texas Instruments. This family is designed as low-cost, low-power peripherals for microprocessors. The 'D' suffix specifically denotes the surface-mount SOIC package option, distinguishing it from other packaging variants like the DR (tape and reel) or DWR versions.

Replacement Considerations

The BQ32000DR is a direct functional equivalent within the same family, offering identical core features but potentially different packaging or reel specifications. Verify pinout compatibility and software register mapping before substitution.