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Real Time Clocks

Real time clocks are an integral part of many applications and have been used in almost every industry. The BQ4802LYDSH is a real time clock designed for applications requiring extended accuracy, prolonged battery life, and low power operation. Specifically, this real time clock is used in automotive applications, such as engine management, computer systems, and telecommunications. The BQ4802LYDSH provides very accurate timekeeping, with a frequency error of less than 2 parts per million (ppm) over the full temperature range.

Working Principle

The BQ4802LYDSH is powered from an external adjustable voltage supply and an internal crystal oscillator. The internal crystal oscillator is used to generate a highly accurate frequency clock signal which is then divided down and used to drive the real time clock. The clock constantly adjusts the oscillator frequency to maintain time accuracy and ensures a rise time of less than one second when the second has just elapsed. The BQ4802LYDSH has an on-board integrated battery controller, allowing it to automatically switch between external and battery power as necessary. This helps to extend the battery life, as only the oscillator current is drained when external power is not available.

Applications

The BQ4802LYDSH is an ideal real time clock for automotive applications, due to its accuracy and its ability to function at extremely low power. It can accurately keep time for vehicle central body controllers, engine control units, and computer systems. It can be used in aftermarket automotive products, such as GPS navigation systems, automobile information systems, and even anti-theft and theft-prevention systems. In addition, the BQ4802LYDSH is also well-suited for use in telecommunications systems, such as GSM cellular towers, VoIP, and PBX systems.

The BQ4802LYDSH provides reliable, accurate, and low-power timekeeping for all sorts of applications. Its on-board battery control ensures that its power consumption is kept to a minimum, while its integrated oscillator guarantees a frequency stability of less than 2ppm over the full temperature range. As such, it is an ideal solution for automotive, telecommunications, and other applications requiring the highest accuracy and reliability.

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