Logger. DS1925 Datasheet


DS1925 Datasheet PDF


DS1925


iButton High-Capacity Temperature Logger
DS1925

EVALUATION KIT AVAILABLE
iButton High-Capacity Temperature Logger with 122KB Data-Log Memory

General Description
The iButton® temperature logger (DS1925) is a rugged, self-sufficient system that measures temperature and records the result in a protected memory section. The recording is done at a user-defined rate. A total of 122K 8-bit readings or 61K 16-bit readings taken at equidistant intervals ranging from 5min to 273hrs can be stored. In addition, there are 512 bytes of nonvolatile memory for storing application-specific information. A mission to collect data can be programmed to begin immediately, after a user-defined delay, or after a temperature alarm. Access to the memory and control functions can be password protected. The DS1925 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 DS1925 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 DS1925 to be mounted on almost any object, including containers, pallets, and bags.
Applications
●● Temperature Logging in Cold Chain ●● Food Safety ●● Bio Science ●● Pharmaceutical and Medical Products High-Tempera-
ture ...



DS1925
DS1925
EVALUATION KIT AVAILABLE
iButton High-Capacity Temperature Logger
with 122KB Data-Log Memory
General Description
The iButton® temperature logger (DS1925) is a rugged,
self-sufficient system that measures temperature and
records the result in a protected memory section. The
recording is done at a user-defined rate. A total of 122K
8-bit readings or 61K 16-bit readings taken at equidistant
intervals ranging from 5min to 273hrs can be stored. In
addition, there are 512 bytes of nonvolatile memory for
storing application-specific information. A mission to col-
lect data can be programmed to begin immediately, after
a user-defined delay, or after a temperature alarm. Access
to the memory and control functions can be password
protected. The DS1925 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 DS1925 is factory-lasered with a
guaranteed 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 DS1925
to be mounted on almost any object, including containers,
pallets, and bags.
Applications
● Temperature Logging in Cold Chain
● Food Safety
● Bio Science
● Pharmaceutical and Medical Products High-Tempera-
ture Logging (Process Monitoring, Industrial Monitoring)
Examples of Accessories
PART
DS9093RA
DS9093A
DS9092
DS1402D-DR8+
ACCESSORY
Mounting Lock Ring
Snap-in FOB
iButton Probe
Blue Dot Receptor Cable
iButton and 1-Wire are registered trademarks of Maxim
Integrated Products, Inc.
Benefits and Features
● Provides High-Quality Temperature Exposure
Assessment of an End Product
• Temperature Measurement Accuracy of ±0.5°C
with Storage for Up to 125,440 Timestamped
Values
• Flexibility to Monitor and Data-Log Long Duration
Exposures with Short-Duration Time Intervals
• Unique Factory-Lasered 64-Bit Serial Number En-
sures Absolute Traceability Because No Two Parts
Are Alike
● Highly Configurable Options for Data Logging and
Security
• Programmable Sample Rates from 5min to 273hrs
• Programmable Recording Start Delay After Elapsed
Time or Upon a Temperature Alarm Trip Point
• Two-Level Password Protection of All Memory and
Configuration Registers
• Measure and Report Internal Battery Level and
Output-Logged Data if a Battery is Depleted
● Physically Robust, Operationally Efficient
• Durable Stainless-Steel Enclosure Withstands
Harsh Environments and Conditions
• Communicates to a Host System with the Single-
Contact 1-Wire Interface
• -40°C to +85°C Operating Temperature Range
Ordering Information appears at end of data sheet.
Typical Application Circuit
VCC
PIOX
µC
PIOY
10kΩ
RPUP
®
02 ® 53
000000FBC52B
1-Wire®
Thermochron®
19-8480; Rev 3; 1/19

DS1925
DS1925
iButton High-Capacity Temperature Logger
with 122KB Data-Log Memory
Absolute Maximum Ratings
IO Voltage to GND...................................................-0.3V to +6V
IO Sink Current...................................................................20mA
Operating Temperature Range............................ -40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range.............................. -40°C to +85°C*
*Storage or operation above +50°C significantly reduces battery life.
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, unless otherwise noted.)
PARAMETER
Operating Temperature
IO PIN: GENERAL DATA
SYMBOL
TA
(Note 1)
CONDITIONS
1-Wire Pullup Resistance
Input Capacitance
Input Leakage Current
High-to-Low Switching
Threshold
RPUP
CIO
IL
VTL
(Notes 2, 3)
(Note 4)
IO pin at VPUP
(Notes 5, 6)
Input Low Voltage
Low-to-High Switching
Threshold
VIL (Notes 2, 7)
VTH (Notes 5, 8)
Switching Hysteresis
VHY (Note 9)
Output Low Voltage
Recovery Time
(Note 2)
VOL
tREC
At 4mA (Note 10)
Standard speed, RPUP = 2200Ω
Overdrive speed, RPUP = 2200Ω
Overdrive speed, directly prior to reset
pulse; RPUP = 2200Ω
Time Slot Duration (Note 2)
tSLOT
Standard speed
Overdrive speed
Rising-Edge Hold-Off Time
tREH
(Note 11)
IO PIN: 1-Wire RESET, PRESENSE-DETECT CYCLE
Reset Low Time (Note 2)
tRSTL
Standard speed, VPUP
Overdrive speed
Presence-Detect Sample
Time (Note 2)
tMSP
Standard speed
Overdrive speed
MIN
TYP
MAX
UNITS
-40 +85 °C
2200
120
6 60
0.5 x
VPUP
0.4
0.75 x
VPUP
0.2 x
VPUP
0.4
5
2
5
65
8
0.1
nF
µA
V
V
V
V
V
µs
µs
µs
480 640
µs
48 80
65 75
µs
8 10
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Maxim Integrated 2

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