DS1921Z：High-Resolution Thermochron iButton Devices _ BDTIC a Leading Distributor in China

DS1921Z：High-Resolution Thermochron iButton Devices

The Thermochron® iButton® devices (DS1921H/Z) 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, both as a direct storage of temperature values as well as in the form of a histogram. Up to 2048 temperature values taken at equidistant intervals ranging from 1 to 255 minutes can be stored. The histogram provides 64 data bins with a resolution of 0.5°C. If the temperature leaves a user-programmable range, the DS1921H/Z will also record when this happened, for how long the temperature stayed outside the permitted range, and if the temperature was too high or too low. Additional 512 bytes of general-purpose battery-backed SRAM allow storing information pertaining to the object to which the DS1921H/Z is associated. Data is transferred serially via the 1-Wire® protocol, which requires only a single data lead and a ground return. Every DS1921H/Z is factory-lasered with a guaranteed unique electrically readable 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 DS1921H/Z to be mounted on almost any object, including containers, pallets, and bags.

Key Features

Digital thermometer measures temperature 1/8°C increments with ±1°C accuracy
Built-in real-time clock (RTC) and timer has accuracy of ±2 minutes per month from 0°C to 45°C
Water resistant or waterproof if placed inside DS9107 iButton capsule (Exceeds Water Resistant 3 ATM requirements)
Automatically wakes up and measures temperature at user-programmable intervals from 1 to 255 minutes
Logs consecutive temperature measurements in 2KB of datalog memory
Records a long-term temperature histogram with 1/2°C resolution
Programmable temperature-high and temperature-low alarm trip points
Records up to 24 time stamps and durations when temperature leaves the range specified by the trip points
512 bytes of general-purpose battery-backed SRAM
Communicates to host with a single digital signal at 15.4kbits or 125kbits per second using 1-Wire protocol
Fixed range: H: +15°C to +46°C; Z: -5°C to +26°C
Digital identification and information by momentary contact
Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures absolute traceability because no two parts are alike
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

DS1921H, DS1921Z: High Resolution Thermochron

DataSheet

title	Download file
DS1921H-DS1921Z Data Sheet	DS1921H-DS1921Z.pdf

Parametrics

Part Number	Interface	Technology	Applications	Usage	Memory Type	Memory Size	Data Logger Type	Temp. Readings	Oper. Temp. (°C)	Budgetary Price
Part Number	Interface	Technology	Applications	Usage	Memory Type	Memory Size	Data Logger Type	Temp. Readings	Oper. Temp. (°C)	See Notes
DS1921H	1-Wire	iButton	Asset Management	Multi Use	NV SRAM	4K bits	Temperature	2048	+15 to +46	$18.31 @1k
DS1921Z	1-Wire	iButton	Asset Management	Multi Use	NV SRAM	4K bits	Temperature	2048	-5 to +26	$18.31 @1k