DESCRIPTION

The DS1682 is an integrated elapsed time recorder that will provide the total amount of time that an event is/has been active since the DS1682 was last reset to zero via the 2-wire bus. When the total time accumulated is equal to the preset alarm trip point and the polarity bit is set to a zero, the Alarm# output will become active to alert the user, or with the polarity bit set to a one, the Alarm# output will become inactive when the values match. This is ideal for applications such as monitoring the total amount of time that something is turned on or in operation, how long something has been used, or the total number of uses since the last calibration or repair.

FEATURES

■ Records the total time that the Event Input has been active and the number of events that have occurred

■ Elapsed Time Counter to monitor event durations with quarter second resolution

■ Built in 32 bit non-volatile Total Time Accumulator Register (34 years)

■ Non-volatile 17-bit Event Counter records the total number of times an event has occurred

■ Programmable 32 bit non-volatile alarm trip point to trigger Alarm# output

■ Alarm# output to alert the user that the total accumulated time limit has been reached

■ Calibrated, Temperature Compensated RC time base (accurate to 1 typ)

■ Stores the contents of the Elapsed Time Counter with the previous total and increments the event counter at the end of each event or power down

■ Reset Enable bit to allow the device to be ■leared to zero, if desired

■ 10 bytes of write protectable EEPROM user memory

■ Write Disable bit to prevent the memory from being changed or erased

■ Anti-Glitch filter will prevent noise spikes from triggering false events on the Event Input

■ 2-wire serial communication

■ Wide power supply range (2.5V – 5.5V)