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PDF DS1921L-F5X Data sheet ( Hoja de datos )
| Número de pieza | DS1921L-F5X | |
| Descripción | Thermochron iButton | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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DS1921L-F5X
Thermochron iButton
SPECIAL FEATURES*
§ Digital thermometer measures temperature in
0.5°C increments (accuracy ±1.0°C)
§ Built-in real-time clock (RTC) and timer has
accuracy of ±2 minutes per month from 0°C
to 45°C
§ Automatically wakes up and measures tem-
perature at user-programmable intervals from
1 to 255 minutes
§ Logs up to 2048 consecutive temperature
measurements in protected nonvolatile (NV)
memory
§ Records a long-term temperature histogram
with 2.0°C resolution
§ Programmable temperature-high and tem-
perature-low alarm trip points
§ Records up to 24 time stamps and durations
when temperature leaves the range specified
by the trip points
§ 512 bytes of general-purpose read/write NV
memory
§ Typical lifetime more than 9 years
§ Communicates to host with a single digital
signal at 14.1kbits or 125kbits per second
using 1-Wire® protocol
COMMON iButton FEATURES
§ Digital identification and information by
momentary contact
§ Unique, factory-lasered and tested 64-bit reg-
istration number (8-bit family code + 48-bit
serial number + 8-bit CRC tester) assures ab-
solute traceability because no two parts are
alike
§ Multidrop controller for 1-Wire net
§ Chip-based data carrier compactly stores
information
§ Data can be accessed while affixed to object
§ Button shape is self-aligning with cup-shaped
probes
§ Durable stainless steel case engraved with
registration number withstands harsh envi-
ronments
§ Easily affixed with self-stick adhesive back-
ing, latched by its flange, or locked with a
ring pressed onto its rim
§ Presence detector acknowledges when reader
first applies voltage
§ Meets UL#913 (4th Edit.). Intrinsically Safe
Apparatus: approved under Entity Concept
for use in Class I, Division 1, Group A, B, C
and D Locations (application pending)
F5 MICROCAN
0.36
5.89
0.51
© 1993
YYWW REGISTERED RR
xx 21
15C000FBC52B
16.25
17.35
IO
GND
All dimensions are shown in millimeters.
ORDERING INFORMATION
DS1921L-F51 -10°C to +85°C F5 iButton®
DS1921L-F52 -20°C to +85°C F5 iButton
DS1921L-F53 -30°C to +85°C F5 iButton
DS1921L-F50 -40°C to +85°C F5 iButton
EXAMPLES OF ACCESSORIES
DS9096P
Self-Stick Adhesive Pad
DS9101
Multi-Purpose Clip
DS9093RA Mounting Lock Ring
DS9093A
Snap-In Fob
DS9092
iButton Probe
1-Wire, Microcan, and iButton are registered trademarks of Dallas Semiconductor
*See ELECTRICAL CHARACTERISTICS table for details.
1 of 40
121003
1 page  
1-Wire CRC GENERATOR Figure 4
Polynomial = X8 + X5 + X4 + 1
DS1921L
1st 2nd 3rd 4th
STAGE STAGE STAGE STAGE
X0 X1 X2 X3
5th
STAGE
X4
6th 7th 8th
STAGE STAGE STAGE
X5 X6
X7
INPUT DATA
X8
MEMORY
The memory map of the DS1921L is shown in Figure 5. The 4096-bit general-purpose SRAM make up
pages 0 through 15. The timekeeping, control, and counter registers fill page 16, called Register Page (see
Figure 6). Pages 17 to 19 are assigned to storing the alarm time stamps and durations. The temperature
histogram bins begin at page 64 and use up to four pages. The temperature logging memory covers pages
128 to 191. Memory pages 20 to 63, 68 to 127, and 192 to 255 are reserved for future extensions. The
scratchpad is an additional page that acts as a buffer when writing to the SRAM memory or the register
page. The memory pages 17 and higher are read-only for the user. They are written to or erased solely
under supervision of the on-chip control logic.
DS1921L MEMORY MAP Figure 5
32-Byte Intermediate Storage Scratchpad
ADDRESS
0000h to
01FFh
0200h to
021Fh
0220h to
027Fh
0280h to
07FFh
0800h to
087Fh
0880h to
0FFFh
1000h to
17FFh
1800h to
1FFFh
General-Purpose SRAM (16 Pages)
32-Byte Register Page
Alarm Time Stamps and Durations
(Reserved for Future Extensions)
Temperature Histogram Memory
(Reserved for Future Extensions)
Datalog Memory (64 Pages)
(Reserved for Future Extensions)
Pages 0 to 15
Page 16
Pages 17 to 19
Pages 20 to 63
Pages 64 to 67
Pages 68 to 127
Pages 128 to 191
Pages 192 to 255
5 of 40
5 Page 
DS1921L
Mission Time Stamp
When a mission is started, a copy of the RTC Registers addresses 0201h, 0202h, and 0204h to 0206h is
saved as the Mission Time Stamp. The Mission Time Stamp does not indicate the time of the first
temperature conversion of a mission. To calculate the time of the first conversion, add to the Mission
Time Stamp as many minutes as specified in the Sample Rate Register plus the value of the Mission Start
Delay. Subsequent temperature conversions will take place as many minutes apart from each other as
specified by the value in the Sample Rate Register. Mission samples occur on minute boundaries.
Mission Time Stamp Register Bitmap
ADDR b7 b6 b5 b4 b3
0215h
0
10 Minutes
0216h
0
12/24 20h.
10h.
AM/PM
0217h
0
0
10 Date
0218h
0
0
0 10m.
0219h
10 Years
b2 b1
Single Minutes
Single Hours
Single Date
Single Months
Single Years
b0
Mission Samples Counter
The Mission Samples Counter indicates how many temperature measurements have taken place during
the current mission in progress (if MIP = 1) or during the latest mission (if MIP = 0). The value is stored
as an unsigned 24-bit integer number. This counter is reset through the Clear Memory command.
Mission Samples Counter Register Map
ADDR b7 b6 b5 b4 b3 b2 b1 b0
021Ah
Low Byte
021Bh
Center Byte
021Ch
High Byte
Device Samples Counter
The Device Samples Counter indicates how many temperature measurements have taken place since the
device was assembled at the factory. The value is stored as an unsigned 24-bit integer number. The
maximum number that can be represented in this format is 16777215, which is higher than the expected
lifetime of the DS1921L iButton. This counter cannot be reset under software control.
Device Samples Counter Register Map
ADDR b7 b6 b5 b4 b3 b2 b1 b0
021Dh
Low Byte
021Eh
Center Byte
021Fh
High Byte
Temperature Logging and Histogram
Once setup for a mission, the DS1921L logs the temperature measurements simultaneously byte after
byte in the datalog memory as well as in histogram form in the histogram memory. The datalog memory
is able to store 2048 temperature values measured at equidistant time points. The first temperature value
of a mission is written to address location 1000h of the datalog memory, the second value to address
location 1001h and so on. Knowing the starting time point (Mission Time Stamp), the interval between
temperature measurements and the Mission Start Delay, one can reconstruct the time and date of each
measurement.
11 of 40
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