DS1554WP-120+

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The DS1554WP-120+ is a battery-backed, low power Real Time Clock module designed to keep accurate time to within ±2 minutes a year and maintain date information even while powered down. The device is capable of running from 0°C to 70°C in mainstream microcontroller and microprocessor systems, especially where power retention functions are required.

The DS1554WP-120+ provides a real-time clock (RTC) with a programmable alarm output and non-volatile timekeeping for year, month, day, hour, minute, and second information. The device can be employed for both single event timing and periodic sychronization of processes. It can run from both 3.3V and 5V power supplies, with low power design that requires only 0.1μA (typical) in battery-backed mode. It operates at frequencies as high as 32.768KHz and can accurately keep time even while powered-down. Its small 1.8 x 3.2mm QFN package makes it perfect for applications with space limitations.

Application Field

The DS1554WP-120+ is designed to be used in low-power, battery-backed systems with critical timekeeping needs. As a real-time clock, it is most suitable for scientific experiments, medical instrumentation, wearable health monitoring, and home or industrial automation projects. In these kinds of applications, the real-time clock can be used to monitor and detect physical or environmental changes such as temperature, humidity, pressure, and other conditions. Additionally, it can be used for device calibration, time/date stamping, schedule/events management, and scheduled shutdown/wake-up operations.

Working Principle

At the heart of the DS1554WP-120+ is a battery-backed precision Real Time Clock (RTC) module, which keeps the time and date even when the system is powered down. The device runs on a low-voltage, low-power 32.768KHz quartz crystal oscillator, which allows it to keep minute-level accuracy while using only 0.1μA. This RTC module is then combined with a dedicated microcontroller, which handles user-programmed settings such as alarm and event control. The microcontroller also provides control and status bits that let users configure the device to their needs.

The Real Time Clock module is integrated with a 32-bit counter, which is programmed to store the current month, day-of-the-week, time-of-day, and leap-year information. This counter can be read through an I2C/SMBus-compatible interface, allowing it to be used in a range of projects including scientific instruments, home or industrial automation systems, and medical equipment.

For additional security the DS1554WP-120+ can be powered separate from the rest of the system with its onboard coin cell battery, allowing it to keep time even when the main power supply is switched off. This can be very useful for medical instrumentation, home automation systems, or any other application where timekeeping is critical.

The DS1554WP-120+ also features programmable alarm output, which can be used to trigger events or wake-up systems when certain conditions are met. The alarm can be set to activate when the changing months, days, hours, or minutes occur, or when the changing or specified days-of-the-week occur. This can be used to ensure timely maintenance, or to ensure periodic system checks.

Overall, the DS1554WP-120+ is an ideal solution for any application where accurate timekeeping and power retention are critical. Its low-power design, battery-backed operation, and programmable alarm output make it the perfect clock/timing module for a wide range of projects.

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