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PDF DS1922L Data sheet ( Hoja de datos )
| Número de pieza | DS1922L | |
| Descripción | (DS1922L/T) Temperature Logger iButton | |
| Fabricantes | Dallas Semiconductor | |
| Logotipo |  |
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www.maxim-ic.com
GENERAL DESCRIPTION
The DS1922L/T temperature logger iButtons® are
rugged, self-sufficient systems that measure
temperature and record the result in a protected
memory section. The recording is done at a user-
defined rate. A total of 8192 8-bit readings or 4096
16-bit readings taken at equidistant intervals ranging
www.DataShfreoemt4U1.csomto 273hrs can be stored. In addition to this,
there are 512 bytes of SRAM for storing application-
specific information and 64 bytes for calibration data.
A mission to collect data can be programmed to
begin immediately, or after a user-defined delay or
after a temperature alarm. Access to the memory and
control functions can be password protected. The
DS1922L/T is configured and communicates with a
host computing device through the serial 1-Wire®
protocol, which requires only a single data lead and a
ground return. Every DS1922L/T is factory-lasered
with a guaranteed unique 64-bit registration number
that allows for absolute traceability. The durable
stainless-steel package is highly resistant to
environmental hazards such as dirt, moisture, and
shock. Accessories permit the DS1922L/T to be
mounted on almost any object, including containers,
pallets, and bags.
APPLICATIONS
Temperature Logging in Cold Chain, Food Safety,
Bio Science, and Pharmaceutical and Medical
Products
High-Temperature Logging (Process Monitoring,
Industrial Temperature Monitoring)
ORDERING INFORMATION
PART
TEMP RANGE
PACKAGE
DS1922L-F5 -40°C to +85°C F5 iButton
DS1922T-F5 0°C to +125°C F5 iButton
See page 11 for Common iButton Features and
Examples of Accessories.
Commands, Registers, and Modes are capitalized for
clarity.
iButton and 1-Wire are registered trademarks of Dallas Semiconductor.
DS1922L, DS1922T
Temperature Logger iButton
With 8kB Datalog Memory
SPECIAL FEATURES
§ Automatically Wakes up, Measures Tempera-
ture, and Stores Values in 8kB of Datalog
Memory in 8- or 16-Bit Format
§ Digital Thermometer Measures Temperature with
8-Bit (0.5°C) or 11-Bit (0.0625°C) Resolution
§ Accuracy Better than ±0.5°C from -10°C to
+65°C (DS1922L), ±0.5°C from +20°C to +75°C
(DS1922T) with Software Correction
§ Water resistant - 1 meter under water for 30 days
§ Sampling Rate from 1s up to 273hrs
§ Programmable Recording Start Delay After
Elapsed Time or Upon a Temperature Alarm Trip
Point
§ Programmable High and Low Trip Points for
Temperature Alarms
§ Quick Access to Alarmed Devices Through
1-Wire Conditional Search Function
§ 512 Bytes of General-Purpose Plus 64 Bytes of
Calibration Memory
§ Two-Level Password Protection of All Memory
and Configuration Registers
§ Communicates to Host with a Single Digital
Signal at up to 15.4kbps at Standard Speed or
up to 125kbps in Overdrive Mode Using 1-Wire
Protocol
§ Operating Range: DS1922L: -40 to +85°C;
DS1922T: 0 to +125°C
PIN CONFIGURATION
5.89
0.51
â
16.25
0A010000FBCâ524B1
1-Wireâ
17.35
IO GND
ALL DIMENSIONS ARE SHOWN IN MILLIMETERS.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
1 of 48
REV: 121003
1 page  
DS1922L/DS1922T
DS1922L MINIMUM PRODUCT LIFETIME VS. TEMPERATURE, FAST SAMPLING
Every Second
Every 30 Sec.
Every 3 Sec.
Every 60 Sec.
Every 10 Sec.
350
300
250
200
www.DataSheet4U.c1o5m0
100
50
0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
DS1922L: Temperature (°C)
Every Second
Every 30 Sec.
Every 3 Sec.
Every 60 Sec.
Every 10 Sec.
100
80
60
40
20
0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
DS1922L: Temperature (°C)
5 of 48
5 Page 
DS1922L/DS1922T
COMMON iButton FEATURES
§ Digital identification and information by momentary contact.
§ Unique factory-lasered 64-bit registration number assures error free device selection and absolute traceability
because no two parts are alike.
§ Built-in 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 environments.
§ Easily affixed with self-stick adhesive backing, 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).
www.DataShEeeXt4AU.McomPLES OF ACCESSORIES
DS9096P
Self-Stick Adhesive Pad
DS9101
Multipurpose Clip
DS9093RA
Mounting Lock Ring
DS9093A
Snap-In Fob
DS9092
iButton Probe
APPLICATION
The DS1922L is an ideal device to monitor for extended periods of time the temperature of any object it is attached
to or shipped with, such as fresh produce, medical drugs and supplies and for use in refrigerators and freezers.
With its shifted temperature range, the DS1922T is suited to monitor processes that require temperatures close to
the boiling point of water, such as pasteurization of food items. Software for setup and data retrieval through the
1-Wire interface is available for free download from the iButton website (www.ibutton.com). This software also
includes drivers for the serial and USB port of a PC, and routines to access the general-purpose memory for
storing application- or equipment-specific data files.
OVERVIEW
The block diagram in Figure 1 shows the relationships between the major control and memory sections of the
DS1922L/T. The device has six main data components: 1) 64-bit lasered ROM, 2) 256-bit scratchpad, 3) 512-byte
general-purpose SRAM, 4) two 256-bit register pages of timekeeping, control, status, and counter registers and
passwords, 5) 64 bytes of calibration memory, and 6) 8192 bytes of data-logging memory. Except for the ROM and
the scratchpad, all other memory is arranged in a single linear address space. The data-logging memory, counter
registers, and several other registers are read-only for the user. Both register pages are write-protected while the
device is programmed for a mission. The password registers, one for a read password and another one for a
read/write password can only be written, never read.
Figure 1 shows the hierarchical structure of the 1-Wire protocol. The bus master must first provide one of the eight
ROM function commands: 1) Read ROM, 2) Match ROM, 3) Search ROM, 4) Conditional Search ROM, 5) Skip
ROM, 6) Overdrive-Skip ROM, 7) Overdrive-Match ROM or 8) Resume. Upon completion of an Overdrive ROM
command byte executed at standard speed, the device will enter Overdrive mode, where all subsequent
communication occurs at a higher speed. The protocol required for these ROM function commands is described in
Figure 11. After a ROM function command is successfully executed, the memory and control functions become
accessible and the master may provide any one of the nine available commands. The protocol for these memory
and control function commands is described in Figure 9. All data is read and written least significant bit first.
11 of 48
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet DS1922L.PDF ] | |
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