DS1746-70

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The DS1746-70 is a 64-bit, non-volatile real-time clock (RTC) chip, which offers a wide range of features and benefits. The DS1746-70 is a low-power, non-volatile real-time clock, designed to provide time, date and event control in an embedded environment. The device is a pin-compatible successor to the industry-standard DS1745R-70 real-time clock.

Application Field

The DS1746-70 is mainly targeted for use in a wide range of applications that require accurate timekeeping over a long period of time. Its main application fields include embedded systems and automotive applications such as automotive navigation systems, instrument clusters, and engine control and diagnostics systems. Furthermore, the device can also find use in industrial systems and portable electronics, such as locks, access control systems, digital video recorders, and alarm systems. Other possible applications include test and measurement equipment, medical equipment, industrial process control, and building automation.

Major Functions

The main features of the DS1746-70 include an internal oscillator, power management features, and an onboard crystal oscillator. The internal oscillator is designed to provide accuracy of timekeeping over a wide temperature range. The power management features enable the device to remain in operation while drawing a minimal amount of power. This is important in battery-powered applications, where power usage must be kept to a minimum. The onboard crystal oscillator enables accurate timekeeping, even when external control signals are not available.

Programming the Internal Registers

The DS1746-70 can be configured using the internal registers which are programmed using the Serial Peripheral Interface (SPI) protocol. The internal registers allow for configuration of the time and date, alarm settings, and interrupt mask settings. In addition, the internal registers can also be used to enable or disable various features, such as periodic timekeeping and the automatic reset feature. The internal registers can be programmed and read via the SPI interface over a wide range of clock frequencies.

Working Principle

The DS1746-70 is designed to provide accurate timekeeping using a monitored oscillator system. The system periodically measures the internal oscillator\'s frequency against an external reference clock and self-adjusts the internal oscillator\'s frequency accordingly. This ensures that the timekeeping accuracy is maintained over long periods of time, even if the external reference clock is changed or stopped. Additionally, the DS1746-70 includes an auto-recovery feature which allows the device to self-adjust to recover from an excessive frequency error which may occur due to environmental changes.

Conclusion

The DS1746-70 is a low-power, reliable non-volatile real-time clock designed for embedded applications. It features an internal oscillator, power management features, and an onboard crystal oscillator, as well as an auto-recovery feature which adjusts the oscillator frequency to compensate for environmental changes. The device can be configured using the internal registers and programmed via an SPI interface. The DS1746-70 is an ideal solution for embedded systems and automotive applications, as well as industrial systems and portable electronics, and other applications requiring accuracy timekeeping over a long period of time.

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