DS1683STR datasheet(5/21 Pages) MAXIM

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DS1683

Total-Elapsed-Time and Event Recorder with Alarm

Maxim Integrated

Detailed Description

The DS1683 is an elapsed-time recorder that tracks the

accumulated time the EVENT pin has been held high as

well as the number of falling edge transitions seen by the

EVENT pin. The main application is to track the accumu-

lated on-time and number of power cycles of a device or

system. Programmable alarm limits for both the accumu-

lated on-time and number of falling edges of the EVENT

pin are available so that the user can be alerted when

these conditions are met. The accumulated elapsed

time that the EVENT pin has been held high is stored

in the 4-byte Elapsed Time Counter (ETC) register. The

number of times the EVENT pin sees a falling transition is

stored in the 2-byte Event Counter register. The DS1683

includes password protection to prevent tampering with

accumulated values, alarm limits, configuration settings,

and user memory values.

The ETC, ETC Alarm Limit, Event Counter, Event Counter

Alarm Limit, Configuration, Password, and User Memory

values are stored in shadowed EEPROM. On power-up,

the values in the ETC and Event Counter are loaded into

SRAM locations. When the state of the EVENT pin causes

changes to the accumulated time and number of events,

it is these SRAM registers that are incremented.

Block Diagram

ELAPSED TIME COUNTER (ETC)

(REGISTERS 0Ah−0Dh)

GLITCH

FILTER

EVENT

ALARM

SDA

SCL

ALARM

LATCH

ETC

ALARM

ENABLE

ETC ALARM LIMIT

(REGISTERS 12h−15h)

OSCILLATOR

EVENT

ALARM

ENABLE

VCC

GND

I2C

INTERFACE

EVENT ALARM LIMIT

(REGISTERS 10h−11h)

EVENT COUNTER

(REGISTERS 08h−09h)

STATUS REGISTER

(REGISTER 01h)

CONFIGURATION REGISTER

(REGISTER 16h)

USER EEPROM

(REGISTERS 20h−2Fh)

COMMAND REGISTER

(REGISTER 00h)

PASSWORD PROTECTION

(REGISTERS 02h−05h)

(REGISTERS 1Ah−1Dh)

ALARM

POLARITY

DS1683

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