DS12C887A

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The DS12C887A is a real-time clock (RTC) that combines the industry-standard PCMCIA serial I/O, two independent 30-pin ports, plus two programmable alarms, integrated with a full calendar clock with leap year calibration and a battery-backed ram.

The RTC functions provide users with the greatest flexibility and most accurate timing possible to support their application. The DS12C887A\'s RTC circuit contains year, month, date, day, hour, minute, and second, plus two programmable alarms. The RTC circuit is controlled by two output signals – the Pin 6 control signal and the Pin 3 “selectable 1Hz or 32kHz signal.” The DS12C887A also includes an automatic voltage detection circuit that safeguards system integrity in the event of an unpredictable power loss or unexpected system reset occur.

The DS12C887A is a highly accurate and versatile RTC that can be used in a range of applications, including embedded systems. Its dual time clock and programmable alarms allow applications to be cron controlled with millisecond accuracy and schedule activities precisely. It is also the ideal choice for applications in monitoring, data acquisition and medical systems where reliability, accuracy and cost-effectiveness are of paramount importance.

The DS12C887A is also an ideal choice for applications involving remote sensing and data logging, as it can easily support a wide variety of functions and applications. The DS12C887A can be used to keep track of run-times and alarm settings, set trigger times for data logging, configure measurement intervals and control multiple devices with only one clock. The device also contains an optional byte addressable EEPROM for additional security.

The main components of the DS12C887A device include a CMOS-based RTC, two programmable alarm outputs, two serial I/O ports, and an on-board battery. The real-time clock core utilizes 32kHz as its input frequency source, combining a dedicated RTC counter and RAM to generate time and date information based on the year, month, day, hour, minutes, and seconds of the current time. The device also features an output clock for further connection to other devices.

The two programmable alarms can be used as one-shots or periodic alarms to start an application on a specific day and time. The alarms use an external pin as a trigger and can also be used to control processes within the system. Additionally, the alarms can also be used to send out a signal to a different device or application.

The DS12C887A also features two serial I/O ports, both of which support standard PCMCIA type II interfaces. The device can be set up to work with any form of computer or embedded application. The I/O port support provides access to the polled and interrupt driven features of the device and allows users to respond quickly and accurately to events within the system. The device also supports a variety of processor interfaces, making it ideal for a wide range of platforms.

The on-board battery that powers the device provides up to 5 year battery life. In order to ensure that the device is powered correctly and to retain accurate time and date information, the user must make sure that the battery is replaced at least once every 5 years. The device also contains an auto-recovery circuit that stores the necessary information when the power is removed from the system, ensuring that the device is always ready to go when power is restored.

In summary, the DS12C887A is a powerful, reliable, and flexible real-time clock that can be deployed in a variety of applications where accuracy and versatility are critical. The device features an integrated RTC circuit and dual programmable alarms, PCMCIA type I/O ports and a battery-backed RAM, all of which provide users with the necessary tools to ensure the utmost accuracy and reliability in their system.

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