DS1390U-18+

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The DS1390U-18+ is a real time clock solution from Dallas Semiconductor. It is an integrated low-power, high-accuracy real time clock (RTC) solution for systems that require both timekeeping and alarm functions. The DS1390U-18+ is a cost-effective alternative to dedicated crystal oscillators and complicated software-controlled RTCs. Its features include high accuracy and low power consumption, making it ideal for use in battery-powered applications. The DS1390U-18+ is designed to provide reliable timekeeping while consuming minimal power, providing long battery life and highly accurate real-time clock data.

The DS1390U-18+ features a 32.768kHz, low-frequency crystal oscillator and an external power source. This combination provides accurate timekeeping, even in low-power or interrupted supply conditions. The clock has an adjustable alarm output and can be used with either the internal oscillator or crystal. The DS1390U-18+ has a highly accurate, temperature-compensated, time-of-day (TOD) clock, which can be programmed for a range of alarms and periodic events. The DS1390U-18+ includes an internal, non-volatile memory for storing timekeeping data. In addition, the clock includes built-in power supervision and a watchdog timer.

The DS1390U-18+ can be used in a variety of applications, depending on the degree of accuracy and precision desired. The clock is well suited for industrial, medical, and other mission-critical applications where precision timing is essential. It can also be used in wearable and mobile devices such as smartwatches, medical monitoring, firearms tracking, vehicle tracking, and other security alarm systems. The clock can also be used in energy management systems, intelligent building automation systems, and other environmental monitoring systems.

The DS1390U-18+ features an advanced calibration algorithm to ensure precise and consistent timing. The built-in aging register adjusts the oscillator frequency to regulate accuracy of the clock over a wide range of temperatures. The temperature compensation register adjusts the TOD clock frequency to provide better accuracy at elevated and reduced temperatures, including those experienced in automotive and industrial applications. The integrated calibration circuitry adjusts for frequency offsets, drift, and system noise to provide accurate timekeeping.

The clock also offers a low cost of ownership through its low power requirements and long battery life. The DS1390U-18+ draws less than 500µA in standby and only 2.5mA in an active cycle, extending battery life and reducing overall hardware costs. It also offers built-in power loss protection, preventing data loss when the power is interrupted. The DS1390U-18+ is designed to provide long-term stability and accurate timekeeping, and it is ideal for use in a broad range of applications.

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