DS1556WP-120IND

The DS1556WP-120IND is a real time clock (RTC) designed by Maxim Integrated, a leader in the world of integrated design. It is a general purpose, low power, and high accuracy RTC and provides accurate timekeeping and date tracking solutions. The device is designed to operate on small single-bus architectures, such as smartphones and IoT applications, and is available in a small 3mmx3mm, 8-pin WLP package.

The DS1556WP-120IND is ideal for use in applications such as asset tracking, sensor monitoring, logging, and data collection. It is also a perfect choice for time-keeping applications such as time and attendance systems, biometric authentication and smart lock systems, due to its low power consumption and high accuracy.

The RTC operates accurately up to -40°C to +85°C and utilizes a precision tuning oscillator for timekeeping accuracy of ±3 minutes per year, with a power consumption of 0.5μA in Standby mode and 4µA in Active mode. It is also equipped with a watchdog timer that can be programmed to initiate a system reset if the counter is not updated within a programmed period.

Working principle: The working principle of the DS1556WP-120IND is based on updating the elapsed time between calendar (Y, M, D) and clock (h, m, s) representations on a defined period. This period can be set by the user and it is used to update the register inside the chip.

The chip is designed with two types of interrupt sources which are used to update the time and date from an external source. The user can select the type of interrupt source from the internal register. The sources include an external oscillator, an external pulse or an internal pulse generated by the clock’s oscillator.

The actual time is counted based on the number of oscillations per second of the clock’s oscillator or on the frequency of the external oscillator. The time is stored into the RTC registers when the interrupt is triggered, and the device will track the time and update the time registers accordingly.

The clock also features a programmable alarm that can generate an interrupt once a specified date and time is reached. The alarm can be programmed to produce a periodic interrupt on a defined interval with a maximum interval of 65535 seconds.

The DS1556WP-120IND is an ideal choice for applications that require precise timekeeping and accuracy. It offers accurate and flexible time-keeping solutions for asset tracking, monitoring, logging, and data collection applications. It is an efficient, low-power RTC solution with an easy to use interface, minimal integration requirements and small footprint.