DS17885-3+

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The DS17885-3+ is a real-time clock and calendar chip manufactured by Dallas Semiconductor. It is a CMOS device with 8 bytes of non-volatile RAM and provides the interface between the digital and real-time world. It is designed to provide reliable date and timekeeping for a wide range of applications as well as ultra low-power operation.

Application Field

The DS17885-3+ is ideal for digital networking applications requiring accurate timekeeping, such as file and print servers, digital video recorders and other embedded designs. It is also suited for applications in other electronic products such as smart grid systems, optical disk drives, GSM/CDMA base stations, home medical equipment, and automotive. Additionally, it can be used in embedded and portable applications where the stringent power requirements of modern systems must be met. It offers a unique combination of both low-power consumption and reliable timekeeping.

Working Principle

The DS17885-3+ operates on a 3.3V power supply and can be driven by a 32.768KHz crystal oscillator. The device utilizes a low-power oscillator circuit and advanced circuitry to ensure accuracy and reliability in timekeeping. It contains an 8-byte RTC RAM which is used to store the time and date information. It has a built-in clock/calendar circuit that maintains time even when the power is not present, which means that it does not need to be reset after a power outage. It also has provisions for power-fail and reset signals for reliable timekeeping operation.

The DS17885-3+ also has an integrated interrupt controller which can be used to generate real-time events. It features 4 alarm output terminals which can be used to generate an alarm signal at a predetermined time or based on certain conditions. The alarm can be programmed to either generate an output or generate a system reset. Additionally, it has an output pin which can be used to drive an LED display or to generate a periodic interrupt.

The DS17885-3+ is also equipped with advanced power management features which helps reduce power consumption. It has a built-in power-fail interrupt which will notify the processor when the power supply is below a certain voltage level. This allows the device to enter low-power sleep mode before the system fails and thus minimizes the risk of data corruption. Additionally, it can be configured to enter the low-power sleep mode when not in use, thus further reducing power consumption.

The DS17885-3+ is a versatile and reliable real-time clock/calendar chip which can provide accurate and reliable date and timekeeping for a wide range of applications. With its advanced power management features and low-power operation, it is ideal for embedded and portable applications. Additionally, its interrupt controller and alarm output terminals make it suitable for applications where real-time events need to be generated.

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