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PDF DS1682 Data sheet ( Hoja de datos )
| Número de pieza | DS1682 | |
| Descripción | Total Elapsed Time Recorder | |
| Fabricantes | Dallas Semiconductor | |
| Logotipo |  |
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PRELIMINARY
DS1682
Total Elapsed Time Recorder with Alarm
www.dalsemi.com
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
cleared 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)
PIN ASSIGNMENT
EVENT 1
6 Vcc
ALARM 2
5 SCL
GND 3
4 SDA
Bottom View
DS1682X 6-pin Flip Chip
EVENT 1
N/C 2
ALARM 3
GND 4
8 Vcc
7 N/C
6 SCL
5 SDA
Top View
DS1682S 8-Pin SOIC (150 mil)
PIN DESCRIPTION
EVENT
- Event Input
ALARM - Alarm Output
GND
- Ground
SDA
- 2-wire Data Input/Output
SCL - 2-wire Clock Input
VCC - Voltage Supply
N/C - No Connect
ORDERING INFORMATION
DS1682
8-Pin µSOP
DS1682S 8-Pin SOIC (150 mil)
DS1682X 6-Pin Flip Chip Package
** For more information of Flip Chip Packaging,
go to www.dalsemi.com to the Released Data
Sheets section and select Chip Scale and Flip
Chip Package Data Index.
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.
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DS1682
DATA LOGGING
When the DS1682 is powered-up, the contents of the Total Time Accumulate register (TTA) are
downloaded to the ETC and the device begins looking for events that trigger the Event input. When an
event triggers the input by transitioning to a high level input, the ETC begins incrementing in quarter
second resolution. When the Event input falls below 0.5*VCC to indicate the end of an Event, a power
failure, or power-down, the contents of the ETC are stored to the non-volatile Total Time Accumulator
register, the Event Counter register is incremented and the ETC is prepared for the next event. There is a
built in pull-down on the Event input to prevent power-up glitches from triggering a false event. As the
ETC is being incremented, there is a non-zero value in the ATP register and the AoR bit in the
Configuration register is set to a 0, the DS1682 will compare the value in the ETC to the value in the
Alarm Trip Point register to see when the value in the ETC is equal to or greater than the value in the
Alarm Trip Point register. When the value in the ETC exceeds the value in the Alarm Trip Point register,
the Alarm# output is enabled/disabled depending on the value of the Polarity bit.
The ETC will not roll over to 0000h once FFFFh is reached. The DS1682 will stop counting time once
FFFFh is reached. This should take approximately 34 years with the event pin pulled high. When the
Event pin is transitioned, the 2-wire bus is not available for communications for 200 mS.
CLOCK
The clock circuitry consists of a calibrated, temperature compensated RC time base and a 32-bit Elapsed
Time Counter (ETC) which increments on the quarter second. The total time of all events is stored in the
non-volatile Total Time Accumulator register. As the ETC is being incremented and there is a non-zero
value in the ATP register and the AoR bit in the Configuration register is set to a 0, the DS1682 will
compare the value in the ETC to the value in the Alarm Trip Point register to see when the value in the
ETC is equal to or greater than the value in the Alarm Trip Point register. When the value in the ETC
exceeds the value in the Alarm Trip Point register, the Alarm# output is enabled/disabled depending on
the value of the Polarity bit.
TOTAL TIME ACCUMULATOR REGISTER
The Total Time Accumulator register is an EEPROM based 32 bit register that holds the total “ON” time
of all events up to a total of about 34 years worth of event time. This value is not erasable when the Reset
Enable and AoR bits in the Configuration register are set to a zero and does not require a power source to
insure the data’s integrity. This register can only be cleared when the Reset Enable bit in the
Configuration register is set to a one or the AoR bit is set to a 1 with the Alarm# pin held high, and the
Reset command is sent via the 2-wire bus. A capacitor or other temporary energy source may be required
to hold the Voltage 150 mS after the event has completed if the system power is removed at the same
time as the event ends in order to allow the contents of the ETC to be stored properly. With less than the
150 mS of power after the end of the event, the data may be lost. The LSB is written first to be sure that
the most likely changed data is saved first.
ALARM TRIP POINT REGISTER
The Alarm Trip Point register (ATP) is a 32-bit register that holds the time value in quarter seconds that
is set by the user via the 2-wire bus to enable/disable the Alarm# output when the value is equal to or
greater than the value in the ETC.
EVENT COUNTER REGISTER
This 17-bit register set provides the total number of data samples that have been logged during the life of
the product up to 131,072 separate events. The Event Counter consists of 2-bytes of memory in the
memory map and the MSb being the Event Roll Over flag in the Configuration Register. The Event Roll
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AC ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL MIN
EEPROM Lockout Time after
event
tEEV
500
Time from Event = (0.5*VCC)
until ETC Fully Stored (VCC >
2.7V)
tPF
50
EEPROM Write Time
Alarm# Output Active Low
Pulse Width
tEW
tSL
Alarm# Output Active High
Pulse Width
tSH
Alarm# Input Pulled Low and
Released Pulse Width
tSPL
Minimum Signal Hold Time
Minimum Event Hold
Input Capacitance
tSIG
tEVNT
Ci
TBD
TBD
SCL clock frequency
fscl
Bus free time between a
tbuf 4.7
STOP and START condition
Hold time (repeated) START thd:sta
4.0
condition.
LOW period of SCL
tlow 4.7
HIGH period of SCL
thigh
4.0
Set-up time for a repeated
tsu:sta
4.7
START
Data hold time
thd:dat
0
Data set-up time
tsu:dat
250
Rise time of both SDA and
tr
SCL signals
Fall time of both SDA and
tf
SCL signals
Set-up time for STOP
tsu:sto
4.0
Capacitive load for each bus
Cb
line
DS1682
(-40°C to 85°C; VCC = 2.5 to 5.5V)
TYP
MAX UNITS NOTES
ms
100 ms
150
62.5
437.5
500
200
5
100
1000
1000
400
ms
ms
ms
ms
ms
ms
pF
kHz
µs
µs
µs
µs
µs
µs
ns
ns
ns
µs
pF
2
3
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| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet DS1682.PDF ] | |
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