BU2285FV-E2

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Typical applications for the BU2285FV-E2 chip are for products requiring timing such as clocks, watches, calculators, and automotive control systems. This chip is capable of providing precise timing from back up supplies with an accuracy of up to 10 minutes a year while consuming very little power.

Overview

Common clock configurations are implemented by the BU2285FV-E2 chip. It is designed as time-base generator to produce timekeeping systems and precision digital timers. It features a heightened accuracy independent of battery voltage, temperature, and environmental noise. Also, the device is at a full accuracy throughout its process range, for accurate timekeeping to 14-bit resolution.

A built-in power back up supply allows it to operate from external 3V, 3.3V, or 5V battery supply and a quartz crystal oscillator. An oscillator introduces jitter and aging, but the BU2285FV-E2 is designed to minimize the affect the oscillator has on the accuracy of timekeeping.

Features

The BU2285FV-E2 supports a wide range of features that make it useful in timekeeping applications. It has a proprietary power back up select, allowing it to be used under extreme battery conditions. Furthermore, its frequency accuracy is adjusted by the supply voltage, thus eliminating a source of inaccuracy caused by temperature variations. Moreover, this chip has a high reliability design, eliminating the need for manual adjustment and tuning with external components.

This chip includes an integrated oscillator and voltage regulator. It also contains advanced interpolation and clock synthesis functions, enabling users to construct a wide range of clock/timekeeping systems. The BU2285FV-E2 supports standard input and output levels, reducing its current consumption and thus extending battery life.

Working Principle

BU2285FV-E2 is a precision time-base generator that uses a quartz crystal oscillator in conjunction with an internal voltage regulator to maintain time accuracy. It performs a voltage control frequency adjustment (VCFA) to minimize jitter, frequency deviation, and aging. VCFA allows precision frequency adjustment by controlling a dedicated charging current to the crystal oscillator. This current is directly regulated by the supply voltage.

Once a crystal oscillator is connected to the chip, the oscillator will immediately synchronize with the BU2285FV-E2\'s internal clock generator and time base. This time base is maintained with a frequency of 32.768kHz, with second, minute, and hour count data being stored in the internal registers.

To improve the accuracy of timing and prevent sudden frequency deviation due to environmental noise, the duty cycle of the pulses from the clock generator is adjusted with a duty-adjustment circuit. This reduces edge jitter caused by components connected to the clock line, thus improving accuracy in data transmission.

Conclusion

The BU2285FV-E2 is a versatile chip for timekeeping applications in digital products, automotive parts, and clocks. Its features include a proprietary power back up select, allowing it to be used in extreme conditions, as well as voltage control frequency adjustment, advanced interpolation and clock synthesis, and support for standard input and output levels. This chip allows users to construct a wide range of timekeeping systems with a high level of accuracy and reliability, while reducing current consumption and extending battery life.

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