The DS1683 is an integrated elapsed-time recorder con-
taining a factory-calibrated, low-temperature-coefficient
RC time base that eliminates the need for an external
crystal. Using EEPROM technology to maintain data in
the absence of power, the DS1683 requires no backup
power source. The DS1683 detects and records the num-
ber of falling edge transitions on the EVENT pin as well
as the total cumulative time that the EVENT pin is held
high. The ALARM pin alerts the user when the total time
accumulated equals or exceeds the user-programmed
alarm value, or when the total number of events equals
or exceeds the user-programmed alarm value. The polar-
ity of the open-drain ALARM pin can be programmed
to either drive low or become high impedance upon an
alarm condition. The DS1683 is ideal for applications that
monitor the total amount of time that a device has been
in operation and/or the number of uses since inception
service, repair, or last calibration.
Benefits and Features
S
Records the Total Time the EVENT Input Has Been
Active High and Number of Events (Falling Edges
of EVENT) That Have Occurred
S
32-Bit, Nonvolatile, Elapsed Time Counter (ETC)
Monitors Event Duration with Quarter Seconds
Resolution and Provides 34 Years of Total Time
Accumulation
S
Nonvolatile 16-Bit Event Counter Records the
Number of Falling Edges Seen by the EVENT Pin
S
Calibrated, Low-Temperature-Coefficient RC Time
Base
S
16 Bytes of User EEPROM
S
Password Protection Scheme (4 Bytes)
S
I
2
C-Compatible Interface
S
+2.5V to +5.5V Operating Voltage Range
Applications
High-Temp, Rugged, Industrial Applications Where
Vibration or Shock Could Damage a Quartz Crystal
Any System Where Time-of-Use is Important to
Track
Power-on-Time Recorder
Ordering Information
appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to
www.maximintegrated.com/DS1683.related.
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-6388; Rev 0; 6/12
DS1683
Total-Elapsed-Time and Event Recorder with Alarm
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
Voltage Range on V
CC
, ALARM, SDA, SCL ........-0.5V to +6.0V
Voltage Range on EVENT ........................ -0.5V to (V
CC
+ 0.5V),
not to exceed +6.0V
Continuous Power Dissipation (T
A
= +70NC)
SO (derate 5.9mW/NC above +70NC) .......................470.6mW
Maximum Junction Temperature.....................................+150NC
Operating Temperature Range .......................... -40NC to +85NC
Programming Temperature Range ....................... 0NC to +70NC
Storage Temperature Range............................ -55NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
(T
A
= -40NC to +85NC, unless otherwise noted.)
PARAMETER
Supply Voltage
Input Logic 1 (SCL, SDA)
Input Logic 0 (SCL, SDA)
EVENT Input Trip Point
EVENT Trip Point Hysteresis
Power-On Reset
SYMBOL
V
CC
V
IH
V
IL
V
ETP
V
HYS
V
POR
(Note 1)
CONDITIONS
MIN
2.5
0.7 x V
CC
-0.3
0.3 x
V
CC
1% of V
CC
2.4
V
TYP
MAX
5.5
V
CC
+ 0.3
0.3 x V
CC
0.5 x
0.7 x
V
CC
V
CC
UNITS
V
V
V
V
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 2.5V to 5.5V, T
A
= -40NC to +85NC, unless otherwise noted.)
PARAMETER
Input Leakage
ALARM Output (I
OL
= 10mA)
SDA Output (I
OL
= 4mA)
Active Supply Current
EEPROM Write Current
SYMBOL
I
LI
V
OL
V
OL
I
CCA
I
EE
(Note 1)
(Note 1)
180
250
CONDITIONS
MIN
-1
TYP
MAX
+1
0.8
0.4
300
350
UNITS
FA
V
V
FA
FA
EVENT TIMING
(V
CC
= 2.5V to 5.5V, T
A
= -40NC to +85NC, unless otherwise noted.)
PARAMETER
Time Event Minimum
Time Event Increment
Time Event Max
CLR ALM to Alarm Set
SYMBOL
t
G
t
EI
t
EM
(Note 1)
(Note 1)
(Note 2)
(Note 2)
10
CONDITIONS
MIN
10
237.5
TYP
35
250
MAX
70
262.5
34
150
UNITS
ms
ms
Years
Fs
Maxim Integrated
2
DS1683
Total-Elapsed-Time and Event Recorder with Alarm
I
2
C AC ELECTRICAL CHARACTERISTICS
(V
CC
= 2.5V to 5.5V, T
A
= -40NC to +85NC, timing referenced to V
IL(MAX)
and V
IH(MIN)
, unless otherwise noted.) (Figure
7)
PARAMETER
SCL Clock Frequency
Bus Free Time Between STOP
and START Conditions
Hold Time (Repeated) START
Condition
Low Period of SCL
High Period of SCL
Data Hold Time
Data Setup Time
START Setup Time
SDA and SCL Rise Time
SDA and SCL Fall Time
STOP Setup Time
SDA and SCL Capacitive
Loading
EEPROM Write Time
SYMBOL
f
SCL
t
BUF
t
HD:STA
t
LOW
t
HIGH
t
HD:DAT
t
SU:DAT
t
SU:STA
t
R
t
F
t
SU:STO
C
B
t
W
(Note 3)
(Notes 4, 5, 6)
10
(Note 3)
(Note 3)
1.3
0.6
1.3
0.6
0
100
0.6
20 +
0.1C
B
20 +
0.1C
B
0.6
400
20
300
300
0.9
CONDITIONS
MIN
TYP
MAX
400
UNITS
kHz
Fs
Fs
Fs
Fs
Fs
ns
Fs
ns
ns
Fs
pF
ms
NONVOLATILE MEMORY CHARACTERISTICS
(V
CC
= 2.5V to 5.5V, unless otherwise noted.)
PARAMETER
EEPROM Write Cycles
EEPROM Write Cycles (4 Banks)
SYMBOL
CONDITIONS
T
A
= +70NC (Note 7)
T
A
= +70NC (Note 8)
MIN
50,000
200,000
MAX
UNITS
Writes
Writes
Note 1:
All voltages are referenced to ground. Currents entering the IC are specified as positive; currents exiting the IC are specified
as negative.
Note 2:
Guaranteed by design.
Note 3:
C
B
: Total capacitance of one bus line in pF.
Note 4:
EEPROM write time begins after a STOP condition occurs.
Note 5:
A decoupling capacitor to supply high instantaneous currents during EEPROM writes is recommended. A typical value is
0.01FF. V
CC
must be maintained above V
CC(MIN)
, including transients, during EEPROM writes.
Note 6:
V
CC
must be at or above 2.5V for t
W
after the end of an event to ensure data transfer to the EEPROM.
Note 7:
Memory locations to which this specification applies: User Memory, ETC Alarm Limit, Event Counter Alarm Limit,
Configuration, Password Value.
Note 8:
Memory locations to which this specification applies: Event Counter register, ETC register.
Maxim Integrated
3
DS1683
Total-Elapsed-Time and Event Recorder with Alarm
Pin Configuration
TOP VIEW
EVENT
N.C.
ALARM
GND
1
2
3
4
+
8
V
CC
N.C.
SDA
SCL
DS1683
7
6
5
SO
Pin Description
PIN
1
2, 7
NAME
EVENT
N.C.
FUNCTION
Event Input. The EVENT pin controls when the values in the Elapsed Time Counter (ETC) register and
the Event Counter register are incremented. The EVENT pin also determines when the data in these
registers is stored to EEPROM.
No Connection. These pins are not connected internally.
Alarm Output. The ALARM pin is an open drain structure, and is set active when an alarm condition is
met. The active state of this pin is controlled by the ALRM POL bit located in the Configuration register.
Once the ALARM pin is active, it will remain active until the alarm condition is cleared and the CLR
ALM bit in the Command register is set.
Ground
I
2
C Serial-Clock Input. The SCL pin is the serial-clock input for the I
2
C synchronous communications
channel. The SCL pin is an input that requires an external pull-up resistor.
I
2
C Serial-Data Input/Output. The SDA pin is the data input/output signal for the I
2
C synchronous com-
munications channel. The SDA pin is an open-drain I/O, which requires an external pullup resistor.
+2.5V to +5.5V Input Supply
3
ALARM
4
5
6
8
GND
SCL
SDA
V
CC
Maxim Integrated
4
DS1683
Total-Elapsed-Time and Event Recorder with Alarm
Block Diagram
OSCILLATOR
ELAPSED TIME COUNTER (ETC)
(REGISTERS 0Ah−0Dh)
V
CC
V
CC
ETC ALARM LIMIT
(REGISTERS 12h−15h)
GLITCH
FILTER
EVENT COUNTER
(REGISTERS 08h−09h)
EVENT ALARM LIMIT
(REGISTERS 10h−11h)
STATUS REGISTER
(REGISTER 01h)
CONFIGURATION REGISTER
(REGISTER 16h)
COMMAND REGISTER
(REGISTER 00h)
USER EEPROM
(REGISTERS 20h−2Fh)
EVENT
ALARM
ENABLE
ETC
ALARM
ENABLE
ALARM
LATCH
ALARM
POLARITY
ALARM
EVENT
SDA
SCL
I
2
C
INTERFACE
GND
DS1683
PASSWORD PROTECTION
(REGISTERS 02h−05h)
(REGISTERS 1Ah−1Dh)
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
Maxim Integrated
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
1 Introduction
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