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DS1923 Datasheet

iButton Hygrochron Temperature/Humidity Logger

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DS1923
iButton Hygrochron
Temperature/Humidity Logger
with 8KB Datalog Memory
General Description
The iButton® temperature/humidity logger (DS1923) 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 read-
ings, taken at equidistant intervals ranging from 1s to
273hr, can be stored. Additionally, 512 bytes of SRAM
store application-specific information and 64 bytes store
calibration data. A mission to collect data can be pro-
grammed to begin immediately, after a user-defined
delay, or after a temperature alarm. Access to the mem-
ory and control functions can be password protected.
The DS1923 is configured and communicates with a
host-computing device through the serial 1-Wire® proto-
col, which requires only a single data lead and a ground
return. Every DS1923 is factory lasered with a guaran-
teed unique 64-bit registration number that allows for
absolute traceability. The durable stainless-steel pack-
age 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.
Applications
Programmable Recording Start Delay After Elapsed
Time or Upon a Temperature Alarm Trip Point
512 Bytes of General-Purpose Memory Plus
64 Bytes of Calibration Memory
Two-Level Password Protection of All Memory and
Configuration Registers
Individually Calibrated in a NIST-Traceable Chamber
Calibration Coefficients for Temperature and
Humidity Factory Programmed Into Nonvolatile (NV)
Memory
Rugged Construction Survives Harsh Environments
Hydrophobic Filter Protects Sensor Against Dust,
Dirt, Contaminants, and Water Droplets/
Condensation with IP56 Enclosure Rating
CE, FCC, and UL913 Certifications
Simple Serial Port Interfaces to Most Microcontrollers
for Rapid Data Transfer
Communicates to Host with a Single Digital Signal
Up to 15.4kbps at Standard Speed or Up to
125kbps in Overdrive Mode Using 1-Wire Protocol
Quick Access to Alarmed Devices Through 1-Wire
Conditional Search Function
Temperature and Humidity Logging in Food
Preparation and Processing
Transportation of Temperature-Sensitive and
Humidity-Sensitive Goods, Industrial Production
Warehouse Monitoring
Environmental Studies/Monitoring
Ordering Information
PART
DS1923-F5#
TEMP RANGE
-20°C to +85°C
PIN-PACKAGE
F5 Can
#Denotes a RoHS-compliant device that may include lead(Pb)
that is exempt under the RoHS requirements.
Benefits and Features
High Accuracy, Full-Featured Digital Temperature and Examples of Accessories
Humidity Logger Simplifies Temperature Data
Collection and Dissemination of Electronic
Temperature Record
Digital Hygrometer Measures Humidity with 8-Bit
(0.6%RH) or 12-Bit (0.04%RH) Resolution
Temperature Accuracy Better Than ±0.5°C from
-10°C to +65°C with Software Correction
PART
DS9096P
DS9101
DS9093RA
DS9093A
DS9092
ACCESSORY
Self-Stick Adhesive Pad
Multipurpose Clip
Mounting Lock Ring
Snap-In FOB
iButton Probe
Measures Temperature with 8-Bit (0.5°C) or 11-Bit
(0.0625°C) Resolution
Operating Range: -20°C to +85°C; 0 to 100% RH
(see Safe Operating Range Graph)
Common iButton Can Features and Pin Configuration appear
at end of data sheet.
Automatically Wakes Up, Measures Temperature
and/or Humidity, and Stores Values in 8kB of
Data-Log Memory in 8-Bit or 16-Bit Format
Built-In Capacitive Polymer Humidity Sensor for
Humidity Logging
Sampling Rate from 1s Up to 273hr
Programmable High and Low Trip Points for
Temperature and Humidity Alarms
iButton and 1-Wire are registered trademarks of Maxim Integrated Products, Inc.
19-4991; Rev 8; 3/15


Maxim Integrated Semiconductor Electronic Components Datasheet

DS1923 Datasheet

iButton Hygrochron Temperature/Humidity Logger

No Preview Available !

DS1923
iButton Hygrochron
Temperature/Humidity Logger
with 8KB Datalog Memory
Absolute Maximum Ratings
IO Voltage Range Relative to GND ..........................-0.3V to +6V
IO Sink Current....................................................................20mA
Operating Temperature
and Humidity Range ................-20°C to +85°C, 0 to 100%RH*
Storage Temperature
and Humidity Range ................-40°C to +85°C, 0 to 100%RH*
*See the Safe Operating Range graph.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics
(VPUP = +3.0V to +5.25V, TA = -20°C to +85°C.) (Note 31)
PARAMETER
SYMBOL
CONDITIONS
IO PIN: GENERAL DATA
1-Wire Pullup Resistance
Input Capacitance
Input Load Current
High-to-Low Switching Threshold
Input Low Voltage
Low-to-High Switching Threshold
Switching Hysteresis
Output Low Voltage
Recovery Time
(Note 1)
RPUP
CIO
IL
VTL
VIL
VTH
VHY
VOL
tREC
(Notes 1, 2)
(Note 3)
IO pin at VPUP
(Notes 4, 5)
(Notes 1, 6)
(Notes 4, 7)
(Note 8)
At 4mA (Note 9)
Standard speed, RPUP = 2.2k
Overdrive speed, RPUP = 2.2k
Overdrive speed directly prior to reset
pulse, RPUP = 2.2k
Rising-Edge Hold-Off Time
tREH
(Note 10)
Standard speed
Time-Slot Duration (Note 1)
tSLOT
Overdrive speed, VPUP > 4.5V
Overdrive speed (Note 11)
IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE
Reset Low Time (Note 1)
tRSTL
Standard speed, VPUP > 4.5V
Standard speed (Note 11)
Overdrive speed, VPUP > 4.5V
Overdrive speed (Note 11)
Presence-Detect High Time
tPDH
Standard speed, VPUP > 4.5V
Standard speed (Note 11)
Overdrive speed (Note 11)
Presence-Detect Fall Time
(Note 12)
Standard speed, VPUP > 4.5V
tFPD Standard speed
Overdrive speed
MIN TYP MAX UNITS
2.2
100 800
6 10
0.4 3.2
0.3
0.7 3.4
0.09 N/A
0.4
5
2
5
0.6 2.0
65
8
9.5
k
pF
μA
V
V
V
V
V
μs
μs
μs
480
690
48
70
15
15
2
1.5
1.5
0.15
720
720
μs
80
80
60
63.5 μs
7
5
8 μs
1
www.maximintegrated.com
Maxim Integrated | 2


Part Number DS1923
Description iButton Hygrochron Temperature/Humidity Logger
Maker Maxim Integrated
Total Page 30 Pages
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