DS1747WP-120 Datasheet/PDFThe DS1747WP-120 is one of the latest models in a line of real-time clocks (RTCs) from Maxim Integrated. It has become a popular choice for many embedded application projects due to its improved accuracy, low power consumption and tiny form factor. In this article, we will discuss the application areas and working principle of this RTC in detail.
The DS1747WP-120 RTC is designed for use in mission-critical systems where accuracy is a top priority. It incorporates multitasking capabilities and has several timing features that make it suitable for applications such as network-enabled message communications and security applications. This RTC has a high-accuracy of ±0.77 ppm over the -10°/+60°C ambient temperature range and can operate for over 10 years on a single 3.6V lithium battery. Additionally, it features reverse battery protection and has low power consumption, requiring only 0.24mA at 3V operation.
In addition to its accuracy and quality performance, the DS1747WP-120 also has a small form factor. Its size is 2.5mm x 1.1mm, giving it the distinction of being the smallest real time clock available in the market. This small size makes the DS1747WP-120 suitable for applications where size is a major consideration. Further, this real-time clock is incredibly energy efficient and can run on as little as 0.24mA. This not only allows for longer battery life, but also makes this RTC ideal for portable applications.
The DS1747WP-120 has many features that make it suitable for a variety of applications. It has a calendar mode that provides full year, month, date and day information. It also has an alarm and can alert the user with a programmable reminder. In addition, it has two programmable outputs that can trigger interrupts and has a selectable frequency output for pulse width modulation (PWM).
The working principles of the DS1747WP-120 real-time clock are relatively straightforward. The clock is designed to keep track of the date and time and to continually update its memory based on the amount of time elapsed. The clock is organized into several register pairs that help to store and maintain information. The first register pair is the month and year registers, which help to calculate leap years and store the month and year information. The second register pair is the seconds and minutes, which count up or down the corresponding time period. The third register pair is the hours register, which stores hour information and also has a PM/AM bit. The fourth register pair is the day data registers, which store the day of the week and help to calculate the weekly timing.
The DS1747WP-120 has several other features that help it to function efficiently. It can be programmed for either a 12-hour or 24-hour format. It also has an external frequency input that allows it to be synchronized with an external frequency source. This helps to maintain greater accuracy in the timekeeping of the clock. Lastly, the clock contains a power-down counter and a power-up reset feature, which maintain the accuracy of the clock under extreme conditions such as power outages.
The DS1747WP-120 is a high-performance real-time clock that is suitable for a wide range of applications. It is accurate, low power, and tiny make it an ideal choice for embedded systems that require accuracy and reliability. Its unique features, such as the programmable reminders, alarms, and precision timekeeping, make it the perfect choice for mission-critical applications. The DS1747WP-120 is likely to become the default choice of RTCs for many applications in the near future.