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PDF DS1683 Data sheet ( Hoja de datos )
| Número de pieza | DS1683 | |
| Descripción | Total-Elapsed-Time and Event Recorder | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-6388; Rev 0; 6/12
DS1683
Total-Elapsed-Time and Event Recorder with Alarm
General Description
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.
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
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 I2C-Compatible Interface
S +2.5V to +5.5V Operating Voltage Range
Ordering Information appears at end of data sheet.
www.DataSheet.net/
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/DS1683.related.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
DS1683
Total-Elapsed-Time and Event Recorder with Alarm
Block Diagram
VCC
EVENT
VCC
GLITCH
FILTER
SDA I2C
SCL INTERFACE
GND
OSCILLATOR
ELAPSED TIME COUNTER (ETC)
(REGISTERS 0Ah−0Dh)
ETC ALARM LIMIT
(REGISTERS 12h−15h)
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)
PASSWORD PROTECTION
(REGISTERS 02h−05h)
(REGISTERS 1Ah−1Dh)
ETC
ALARM
ENABLE
EVENT
ALARM
ENABLE
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ALARM
LATCH
ALARM
POLARITY
ALARM
DS1683
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.
5
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
DS1683
Total-Elapsed-Time and Event Recorder with Alarm
REGISTER 00h: COMMAND REGISTER
Factory Default/Power-On Value 00h
Read Access
All
Write Access
All
Memory Type
SRAM, Volatile
Memory
Access
00h
N/A
Reserved
BIT 7
N/A
Reserved
N/A
Reserved
N/A
Reserved
N/A
Reserved
N/A
Reserved
N/A
Reserved
R/W
CLR ALM
BIT 0
7:1 Reserved Reserved
Clear Alarm Bit. This bit reads as a 0. Writing this bit to a 1 unlatches the active ALARM output, set-
0 CLR ALM ting the ALARM pin to its inactive state if the alarm condition is no longer present. If the alarm condi-
tion persists, the ALARM pin once again asserts to its active state.
REGISTER 01h: STATUS REGISTER
Factory Default /Power-On Value
Read Access
Write Access
Memory Type
00h
All
N/A
SRAM, Volatile
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Memory
Access
01h
N/A
Reserved
BIT 7
N/A
Reserved
N/A
Reserved
R/W
Reserved
R/W
Reserved
R/W
EVENT
R/W
EVENT AF
R/W
ETC AF
BIT 0
7:3 Reserved Reserved
2 EVENT This bit indicates the status of the EVENT pin’s logic level, detected after the tG glitch filter time.
Default value = 0. If the value in the Event Counter SRAM value is greater than or equal to the Event
1
EVENT AF
Counter Alarm Limit value, then this bit is automatically set to a value of 1 to indicate an ALARM
event. When the EVENT SRAM Counter value is less than the Event Counter Alarm Limit, this bit
automatically set to a value of 0, indicating that there is no EVENT alarm.
Default value = 0. If the value in the ETC SRAM value is greater than or equal to the ETC Alarm Limit
0
ETC AF
value, then this bit is automatically set to a value of 1 to indicate an ALARM event. When the ETC
SRAM value is less than the ETC Alarm Limit, this bit automatically set to a value of 0, indicating that
there is no ETC alarm.
11
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| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet DS1683.PDF ] | |
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