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DS1678
Real-Time Event Recorder
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Status
Description
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.
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Data Sheet
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Key Features
- 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
- Underwriters Laboratories (UL) Recognized
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Key Specifications:
| Timekeeping & Real-Time Clocks |
| Part Number |
Date/ Time Format |
Interface |
VSUPPLY
(V) |
Time Keeping Current
(nA) |
CL
(pF) |
Memory Type |
Time of Day Alarms |
Integrated XTAL |
Budgetary Price |
| hh = sec/100 |
typ |
See Notes |
| DS1678 |
YY-MM-DD/ HH:MM:SS |
I2C |
5 |
300 |
12.5 |
None |
1 |
No |
$2.77 @1k |
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See All Timekeeping & Real-Time Clocks (86)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
More Information
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Information Index
Rev 3;
2006-09-19
This page last modified: 2010-05-13
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