iButton Hygrochron DS1923 Temperature/Humidity Logger with 8KB Datalog Memory Programmable Recording Start Delay After Elapsed General Description Time or Upon a Temperature Alarm Trip Point The iButton temperature/humidity logger (DS1923) is a 512 Bytes of General-Purpose Memory Plus rugged, self-sufficient system that measures temperature 64 Bytes of Calibration Memory and/or humidity and records the result in a protected Two-Level Password Protection of All Memory and memory section. The recording is done at a user-defined Configuration Registers rate. A total of 8192 8-bit readings or 4096 16-bit read- ings, taken at equidistant intervals ranging from 1s to Individually Calibrated in a NIST-Traceable Chamber 273hr, can be stored. Additionally, 512 bytes of SRAM Calibration Coefficients for Temperature and store application-specific information and 64 bytes store Humidity Factory Programmed Into Nonvolatile (NV) calibration data. A mission to collect data can be pro- Memory grammed to begin immediately, after a user-defined Rugged Construction Survives Harsh Environments delay, or after a temperature alarm. Access to the mem- Hydrophobic Filter Protects Sensor Against Dust, ory and control functions can be password protected. Dirt, Contaminants, and Water Droplets/ The DS1923 is configured and communicates with a Condensation with IP56 Enclosure Rating host-computing device through the serial 1-Wire proto- CE, FCC, and UL913 Certifications col, which requires only a single data lead and a ground return. Every DS1923 is factory lasered with a guaran- Simple Serial Port Interfaces to Most Microcontrollers teed unique 64-bit registration number that allows for for Rapid Data Transfer absolute traceability. The durable stainless-steel pack- Communicates to Host with a Single Digital Signal age is highly resistant to environmental hazards such as Up to 15.4kbps at Standard Speed or Up to dirt, moisture, and shock. Accessories permit the 125kbps in Overdrive Mode Using 1-Wire Protocol DS1923 to be mounted on almost any object, including Quick Access to Alarmed Devices Through 1-Wire containers, pallets, and bags. Conditional Search Function Applications Temperature and Humidity Logging in Food Ordering Information Preparation and Processing PART TEMP RANGE PIN-PACKAGE Transportation of Temperature-Sensitive and Humidity-Sensitive Goods, Industrial Production DS1923-F5 -20C to +85C F5 Can Warehouse Monitoring Denotes a RoHS-compliant device that may include lead(Pb) that is exempt under the RoHS requirements. Environmental Studies/Monitoring Benefits and Features Examples of Accessories High Accuracy, Full-Featured Digital Temperature and Humidity Logger Simplifies Temperature Data PART ACCESSORY Collection and Dissemination of Electronic DS9096P Self-Stick Adhesive Pad Temperature Record DS9101 Multipurpose Clip Digital Hygrometer Measures Humidity with 8-Bit DS9093RA Mounting Lock Ring (0.6%RH) or 12-Bit (0.04%RH) Resolution DS9093A Snap-In FOB Temperature Accuracy Better Than 0.5C from DS9092 iButton Probe -10C to +65C with Software Correction Measures Temperature with 8-Bit (0.5C) or 11-Bit (0.0625C) Resolution Common iButton Can Features and Pin Configuration appear Operating Range: -20C to +85C 0 to 100% RH at end of data sheet. (see Safe Operating Range Graph) 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 9 10/19iButton Hygrochron DS1923 Temperature/Humidity Logger with 8KB Datalog Memory Absolute Maximum Ratings IO Voltage Range Relative to GND ..........................-0.3V to +6V Operating Temperature IO Sink Current....................................................................20mA and Humidity Range ................-20C to +85C, 0 to 100%RH* Storage Temperature and Humidity Range ................-40C to +85C, 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 (V = +3.0V to +5.25V, T = -20C to +85C.) (Note 31) PUP A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS IO PIN: GENERAL DATA 1-Wire Pullup Resistance R (Notes 1, 2) 2.2 k PUP Input Capacitance C (Note 3) 100 800 pF IO Input Load Current I IO pin at V 6 10 A L PUP High-to-Low Switching Threshold V (Notes 4, 5) 0.4 3.2 V TL Input Low Voltage V (Notes 1, 6) 0.3 V IL Low-to-High Switching Threshold V (Notes 4, 7) 0.7 3.4 V TH Switching Hysteresis V (Note 8) 0.09 N/A V HY Output Low Voltage V At 4mA (Note 9) 0.4 V OL Standard speed, R = 2.2k 5 PUP Overdrive speed, R = 2.2k 2 Recovery Time PUP t s REC (Note 1) Overdrive speed directly prior to reset 5 pulse, R = 2.2k PUP Rising-Edge Hold-Off Time t (Note 10) 0.6 2.0 s REH Standard speed 65 Time-Slot Duration (Note 1) t s SLOT Overdrive speed, V > 4.5V 8 PUP Overdrive speed (Note 11) 9.5 IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE Standard speed, V > 4.5V 480 720 PUP Standard speed (Note 11) 690 720 Reset Low Time (Note 1) t s RSTL Overdrive speed, V > 4.5V 48 80 PUP Overdrive speed (Note 11) 70 80 Standard speed, V > 4.5V 15 60 PUP Presence-Detect High Time t Standard speed (Note 11) 15 63.5 s PDH Overdrive speed (Note 11) 2 7 Standard speed, V > 4.5V 1.5 5 PUP Presence-Detect Fall Time t s FPD Standard speed 1.5 8 (Note 12) Overdrive speed 0.15 1 www.maximintegrated.com Maxim Integrated 2