DS2417P/T&R

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Real-time clock (RTC) devices are essential components in any computer system and are used by applications requiring some form of scheduling or timing. The DS2417P/T&R device is a trusted real-time clock device designed for accurate timekeeping and data logging in device networks. This article provides an overview of the device capabilities, application fields and working principles.

Product Description

The DS2417P/T&R is a highly accurate, low power real-time clock module with a 4-Hz oscillator (watch crystal). It uses a highly efficient switching power supply design with ultra low-power consumption to provide superior accuracy and reliability over a wide temperature range, making it an ideal device for timekeeping and data logging in harsh environmental conditions. With a crystal oscillator and 4-bit wide Counters, the device can maintain high accuracy for critical timing applications.

The DS2417P/T&R clock has an onboard temperature compensation circuit and a built-in watch crystal selectable from 4 to 24 Hz. It includes an internal battery holder and can support an external capacitor for RTC accuracy, allowing the clock to keep accurate time even when the system power is off. The clock can also maintain a programmable time and date, and has several outputs with programmable frequency dividers, including time/date outputs, alarms and interrupt signals. The device is available in both 4-bit and 4+1-bit packages.

Applications

The DS2417P/T&R is an ideal device for timekeeping and data logging applications in harsh environments, such as industrial process control, automotive, medical, aerospace and security systems. It can be used to accurately keep time and to log events in real-time, as well as to schedule and alert applications to initiate actions. In addition, the device can be used for periodic measurement and logging of temperature, humidity, vibration and other environmental data points. The device is also suitable for applications requiring millisecond accuracy, which are not possible with traditional RTCs.

The DS2417P/T&R has several advantages over traditional RTCs including low power consumption, extended battery life and high accuracy over wide temperature range. It is also highly robust and can withstand high shock and vibration. The device also supports a wide range of power supply voltages and can operate over a wide temperature range.

Working Principle

The DS2417P/T&R device is based on a 4-bit counter architecture. The counter values are initially loaded by microcontroller at system startup, after which the clock tracks the time and date information automatically. The clock counts up at the selected oscillator frequency, providing time/date information with millisecond resolution. The clock can store up to 8 bytes of time and date information, as well as provide alarms for applications that require a periodic or event driven interrupt. The alarms can be set to trigger an interrupt when specific time data matches stored data, and the interrupt can be used to initiate an action or reset system state.

The internal battery charger supplies the backup battery current, and the charger is turned on when the reset controller detects a low input voltage. The internal crystal oscillator provides the timekeeping source for the device, with a 4Hz frequency or higher depending on the application. The clock can also be synchronized with an external time source by writing data directly to the time/date registers.

In addition, the DS2417P/T&R features a built-in temperature compensated quartz oscillator that provides an accurate timebase over a wide temperature range. The device also includes a temperature compensation register, which can be used to adjust the crystal frequency to account for temperature changes over the operating temperature range.

Conclusion

The DS2417P/T&R real-time clock device is ideal for use in harsh environmental conditions such as industrial process control, automotive, medical, aerospace and security systems. It provides low power consumption, extended battery life and accuracy over a wide temperature range, and can be used for timing applications requiring millisecond accuracy. The device also includes onboard temperature compensation circuitry and an ultra low-power design, making it an excellent choice for timekeeping and data logging applications.

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