DS1685-3+

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The DS1685-3+ is a real-time clock (RTC) and calendar device that includes a power-up timer, power-fail detect circuitry and SRAM with a trickle-charge circuit. It also allows for the connection of a digitalcontroller such as a microcontroller or FPGA to interface with a peripheral device or system to keep track of time and date. It is typically used in applications that require precision time or date tracking such as PCs, industrial automation, robotics, and health care systems.

The DS1685-3+ is a cost-effective alternative to more complex, full-featured clock/calendar ICs. It offers extended power supply range (4.0 to 4.4V) and an 8-bit controller interface for maximum flexibility and ease of use. The integrated trickle charge circuit makes the device suitable for applications powered by lithium cells in extreme temperatures.

Features and Benefits

The DS1685-3+ is a highly integrated real-time clock and calendar device with the following features and benefits:

• Integrated 8-bit controller interface
• Integrated power-up timer and power-fail detect circuitry
• Wide operating temperature range of -40°C to +85°C
• Wide supply voltage range of 4.4V to 4.0V
• Integrated trickle charge circuit for use with lithium cells in extreme temperatures
• Solid-state construction eliminates need for complicated external circuitry
• Provides accurate time/date information regardless of power cycling or reset conditions
• Low-power operation eliminates the need for external components

Application Fields and Working Principle

As a real-time clock, the DS1685-3+ can be used in a variety of applications. The primary applications are monitoring and tracking time or date. It is typically used in embedded systems such as PCs, industrial automation, robotics, and health care systems. The device also has a wide range of uses as an ultra-low power clock reference, including battery management and power monitoring in smart metering, automotive, medical, and consumer products.

The DS1685-3+ works by providing accurate time and date information to a connected device such as a microcontroller or FPGA. This information can be used to control the device or system’s operations and timing. The device contains a built-in oscillator that is controlled by a crystal for accuracy. The oscillator drives a counter that controls the real-time clock and calendar functions. The clock and calendar data is stored in SRAM and is read by the controller.

The DS1685-3+ also includes a power-up (as opposed to a reset) timer, which is a counter that begins counting down after a programmed delay. This timer prevents the program from entering a loop while the device is powering up. The power-fail detect circuitry detects power fluctuations and sends a signal to the controller so that it can halt operations or store information before the power drops below a certain threshold.

In addition, the DS1685-3+ has an integrated trickle charge circuit that allows for extended operation of the device in extreme temperatures. This circuit provides a stable power supply to the device and minimizes power consumption in lithium cell applications, allowing for extended operation even in extreme temperatures.

The DS1685-3+ also contains an avalanche diode circuit that prevents excessive current from flowing and damaging the device. This feature helps protect the DS1685-3+ from damage due to surges, spikes, and other power fluctuations.

Conclusion

The DS1685-3+ is a powerful, cost-effective real-time clock and calendar device that is suitable for many time monitoring and tracking applications. It offers a wide range of features, including an integrated 8-bit controller interface, power-up timer, power-fail detect circuitry, SRAM, and a trickle charge circuit. It is easy to use, and its wide operating temperature range makes it suitable for a variety of applications. The features and benefits of the DS1685-3+ make it the ideal choice for precise time or date tracking in modern systems.

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