DS1602
Elapsed Time Counter
Part Details
- Two 32-bit counters track time in seconds for >125 years
- One counter tracks real-time on system or battery power while battery input >2.5V
- One counter tracks elapsed time under system power and holds the count under battery power
- Clear function resets a selected counter to 0
- Read/write serial port affords low pin count
- Maximum current drain <1µA with serial port disabled
- 1-byte protocol defines read/write, counter address, and software clear function
- Operating temperature range: -40°C to +85°C
The DS1602 Elapsed Time Counter provides multiple-purpose, low-cost timekeeping with two 32-bit counters. One counter constantly maintains real time by counting seconds whether powered from system or from backup supplies. The other counts only when system power is active, which is useful for monitoring operational on-time for warranty or billing purposes related to equipment use. Under software control, this counter can also count signals to track external real-time events. Both counters output binary data that can be read in standard clock and calendar format using a software algorithm. Read/write communication is transmitted over a 3-wire serial port.
The DS1602 directly attaches to a 32.768kHz crystal and can be made nonvolatile with a backup battery. Installed in a processor-controlled system, the DS1602 combines timekeeping and counting functions at extremely low cost with minimal current consumption that prolongs operational lifetime.
Documentation
Data Sheet 1
Reliability Data 1
Application Note 1
Design Note 3
This is the most up-to-date revision of the Data Sheet.
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