Real-Time Event Recorder

The DS1678 real-time clock (RTC) event recorder records the time and date of a nonperiodic, asynchronous event each time the active-low INT pin is activated. The device records the seconds, minutes, hours, date, day of the week, month, year, and century when the first event occurs, and starts the 16-bit elapsed time counter (ETC). Subsequent events trigger the recording of the ETC into the event-log memory. This allows for up to 1025 events to be logged. Events can be logged while the device is operating from either VCC or VBAT.

* Real-Time Clock/Calendar in Binary-Coded Decimal (BCD) Format Counts Seconds, Minutes, Hours, Date, Month, Day of the Week, and Year with Leap Year Compensation and is Year 2000 Compliant

* Logs Up to 1025 Consecutive Events in Read-Only Battery-Backed Memory

* User-Programmable Event Trigger can be Triggered by the Falling Edge, Rising Edge, or Rising and Falling Edges of the active-low INT Pin

* Event Counter Register Provides Data on the Number of Events that Have Been Logged in the Current Event-Logging Mission

* Programmable RTC Alarm

* 32-Byte, Battery-Backed, General-Purpose NV RAM

* I²C Serial Interface

* Three Resolution Options for Trade-Off Accuracy vs. Maximum Time Between Events

* -40°C to +85°C Industrial Temperature Range