DS1747P-70+

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DS1747 is an advanced nonvolatile real-time clock or calendar chip manufactured by Dallas Semiconductor. It provides a wide range of features useful in applications such as time and day stamping, event control and system logging. This article explains the application field and working principle of the DS1747+ series.

Application field

The DS1747+ series can be used in a variety of fields like access control, data logging, computer based industrial control, automatic meter reading, gas and water present systems, vending machines, home and building automation, instrumentation, and factory automation. It has many useful features to improve the precision of time and date management over many industrial applications. The features also enhance real time clock accuracy, robustness, and flexibility for time sharing.

The chip is applicable in fiber electrical power systems, telecommunication networks, and broadcast communication networks, as well as in medical systems and instrumentation. The device can also be used in applications such as wristwatches, measurement and control systems, military applications, and aviation systems.

Working Principle

The DS1747+ series consists of time of day clock registers, year, month and day information stored in battery-backed memory, power-fail control, alarm control and system reset control. The clocks work on two basic principles: oscillator and counters.

The oscillator portion runs off a 32.768 kHz low frequency crystal oscillator and uses the 32.768 Hz cycle to keep track of the elapsed time since the last synchronizing event. The chip uses two voltage controlled oscillator dividers (vcos) to generate the clock signals. The variable power-save mode feature of the oscillator portion helps to prolong battery backup life.

The counters in the DS1747+ device are 16-bit synchronous binary counters. The counter values increment at a rate of 128 cycles/second and provides hours, minutes, seconds and milliseconds registers. Two programmable alarms, an hour, second and minute alarm, are also provided in the device.

Besides providing time and date information, the DS1747+ also provides alarm and power-fail control features. The alarm feature can be used to alert applications to an event or condition based on time and date. The power-fail control feature ensures that time and date information is maintained while power is applied. It also provides a reset signal to microcontroller or microprocessor based systems when the supply voltage fails to a predetermined level.

The clock operates in a low-power standby or Run modes and draws very little power when compared to other on-chip real-time clocks. It supports external interrupt inputs and requires no external components to operate.

In summary, the DS1747+ series real-time clock chip provides an accurate and cost-effective solution for any time and date management applications. It provides a variety of features such as programmable alarms, dual voltage and temperature compensation, power-fail control, and reset control. The device also has low standby current and a wide operating temperature range. All these features make the DS1747+ series a perfect solution for any time and date management applications.

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