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PDF DS1923-F5 Data sheet ( Hoja de datos )
| Número de pieza | DS1923-F5 | |
| Descripción | Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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DS1923
Hygrochron Temperature/Humidity Logger
iButton with 8kB Data Log Memory
SPECIAL FEATURES
§ Digital Hygrometer Measures Humidity with 8-Bit
(0.6%RH) or 12-Bit (0.04%RH) Resolution
§ Operating Range: -20 to +85°C; 0 to 100%RH
(see Safe Operating Range)
§ Automatically Wakes Up, Measures Temperature
and/or Humidity 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
§ Temperature Accuracy Better than ±0.5°C from
-10°C to +65°C with Software Correction
§ Built-in Humidity Sensor for Simultaneous
Temperature and Humidity Logging
§ Capacitive Polymer Humidity-Sensing Element
§ Hydrophobic Filter Protects Sensor Against Dust,
Dirt, Water, and Contaminants
§ 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 and Humidity Alarms
§ Quick Access to Alarmed Devices Through
1-WireÒ Conditional Search Function
§ 512 Bytes of General-Purpose Memory 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
§ Individually Calibrated in a NIST-Traceable
Chamber
§ Calibration Coefficients for Temperature and
Humidity Factory Programmed into Nonvolatile
(NV) Memory
iButton DESCRIPTION
The DS1923 temperature/humidity logger iButton is a
rugged, self-sufficient system that measures
temperature and/or humidity and records 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 from 1s to 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 DS1923 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 DS1923 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 DS1923
to be mounted on almost any object, including
containers, pallets and bags.
F5 MICROCAN
5.89
0.51
â
16.25
17.35
APPLICATIONS
§ Temperature and Humidity Logging in Food
Preparation and Processing
§ Transportation of Temperature- and Humidity-
Sensitive Goods, Industrial Production
§ Warehouse Monitoring
§ Environmental Studies/Monitoring
ORDERING INFORMATION
PART
TEMP RANGE PACKAGE
DS1923-F5 -20°C to +85°C F5 iButton
IO GND Front Side Brand
All dimensions are
â shown in millimeters.
A0010000FBCâ524B1
1-Wireâ
HygrochronTM
1-Wire and iButton are registered trademarks of Dallas Semiconductor.
Hygrochron is a trademark of Dallas Semiconductor.
1 of 52
Back Side Brand
REV: 110504
1 page  
DS1923: Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory
Safe Operating Range
100
80
60
40
20
0
-40
-20
Safe Operating Zone
0 20 40
Temperature (°C)
60
80
DS1923 Temperature Accuracy
Uncorrected Max Error
SW Corrected Max Error
Uncorrected Min Error
SW Corrected Min Error
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-20 -10 0 10 20 30 40 50 60 70 80
Temperature (°C)
NOTE: The graphs are based on 11-bit data.
5 of 52
5 Page 
DS1923: Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory
Figure 1. DS1923 BLOCK DIAGRAM
1-Wire
Port
IO
ROM
Function
Control
64-Bit
Lasered
ROM
Parasite
Powered
Circuitry
3V Lithium
Memory
Function
Control
256-Bit
Scratchpad
DS1923
32.768 kHz
Oscillator
Thermal
Sense
Humidity
Sensor and
ADC2
Internal
Timekeeping &
Control Reg. &
Counters
General-Purpose
SRAM
(512 Bytes)
Register Pages
(64 Bytes)
ADC1
Calibration Memory
(64 Bytes)
Control
Logic
Datalog
Memory
8K Bytes
PARASITE POWER
The block diagram (Figure 1) shows the parasite-powered circuitry. This circuitry “steals” power whenever the IO
input is high. IO provides sufficient power as long as the specified timing and voltage requirements are met. The
advantages of parasite power are two-fold: 1) by parasiting off this input, battery power is conserved, and 2) if the
battery is exhausted for any reason, the ROM may still be read.
64-BIT LASERED ROM
Each DS1923 contains a unique ROM code that is 64 bits long. The first 8 bits are a 1-Wire family code. The next
48 bits are a unique serial number. The last 8 bits are a CRC of the first 56 bits. See Figure 4 for details. The 1-
Wire CRC is generated using a polynomial generator consisting of a shift register and XOR gates as shown in
Figure 3. The polynomial is X8 + X5 + X4 + 1. Additional information about the Dallas 1-Wire Cyclic Redundancy
Check is available in Dallas Application Note 27.
The shift register bits are initialized to 0. Then starting with the least significant bit of the family code, one bit at a
time is shifted in. After the 8th bit of the family code has been entered, then the serial number followed by the
temperature range code is entered. After the range code has been entered, the shift register contains the CRC
value. Shifting in the 8 bits of CRC returns the shift register to all 0s.
11 of 52
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| PDF Descargar | [ Datasheet DS1923-F5.PDF ] | |
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