BQ3285ESSTR

The BQ3285ESSTR from Texas Instruments is a low power, real time clock (RTC) integrated circuit. It has a built-in quartz crystal oscillator, battery on chip and temperature-compensated oscillator, making it highly accurate, reliable, and energy efficient. The BQ3285ESSTR is ideal for applications requiring timekeeping functions, such as time-stamping, alarm operation, timekeeping for products that require long battery life, and accessory products to enhance the primary product line.

Application Areas

The BQ3285ESSTR can be used in a multitude of applications that require precise timekeeping, including medical devices, data logging systems, high precision clocks, automotive systems, wireless products and access control systems, home and commercial appliances, industrial systems and other critical applications that require accurate and reliable timing.

The device has two operating modes: Active and Unattended. Active mode allows the CPU to directly access the registers of the RTC and set alarm interrupts as well as battery alarm, while Unattended mode allows the host controller to use an I2C or SPI interface to control the RTC.

Features of BQ3285ESSTR

• Low power consumption
• High accuracy quartz crystal oscillator
• On-Chip battery backup
• Highly accurate and temperature compensated oscillator
• On-chip power and clock control circuitry
• Built-in clock compensation register
• Integrated RTC, calendar, and alarm functions
• Embedded calculator with registers and peripheral clock
• 128 bytes of RAM with 8k bytes of EEPROM
• 2-wire serial interface with SPI and I2C support

Working Principle of BQ3285ESSTR

The BQ3285ESSTR RTC relies on a quartz crystal to provide a highly accurate and stable timekeeping signal. The crystal oscillator has a frequency tolerance of ± 0.05 ppm and a stability of ± 2 ppm over time. The oscillator is temperature compensated for further stability. The on-chip battery provides power to the device when the main power supply is unavailable.

The BQ3285ESSTR has a built-in clock compensation register (CCR) which can be used to adjust the frequency of the clock signal. This helps to ensure that the clock retains its accuracy despite fluctuations in the power supply. The CCR helps to maintain accuracy even in extreme temperature ranges.

The BQ3285ESSTR features a built-in calculator and 8K bytes of non-volatile EEPROM memory. The calculator is used to perform calculations and operations with the on-chip registers and peripheral clock. The EEPROM can store user configurations and data even when the device is powered off.

Conclusion

The BQ3285ESSTR low power, real time clock integrated circuit from Texas Instruments is the ideal clock for applications requiring reliable timekeeping. It features a highly accurate quartz crystal oscillator, on-chip battery backup, temperature-compensated oscillator, integrated RTC, calendar, and alarm functions, as well as 128 bytes of RAM and 8K bytes of EEPROM memory. Thanks to its advanced features and reliability, the BQ3285ESSTR is an optimal solution for applications where accuracy and longevity are essential.