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Status
Part Number	Status
DS1821	Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet

FULL DATA SHEET (PDF, 460kB) Download   E-Mail

Description

The DS1821 can function as a standalone thermostat with user-programmable trip-points or as 8-bit temperature sensor with a 1-Wire® digital interface. The thermostat trip-points are stored in nonvolatile memory, so DS1821 units can be programmed prior to system insertion for true standalone operation. The DS1821 has an operating temperature range of –55°C to +125°C and is accurate to ±1°C over a range of 0°C to +85°C. Communication with the DS1821 is accomplished through the open-drain DQ pin; this pin also serves as the thermostat output.

Key Features		Applications/Uses
Requires no external components Unique 1-Wire interface requires only one port pin for communication Operates over a -55°C to +125°C (-67°F to +257°F) temperature range Functions as a standalone thermostat with user-definable trip-points Provides 8-bit (1°C resolution) centigrade temperature measurements Accuracy is ±1°C over 0°C to +85°C range Converts temperature to a digital word in 1 second (max) Available in 3-pin PR35 and 8-pin SO packages Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system		Consumer Products Industrial Systems Thermometers Thermostatic Controls

Diagram

Block Diagram

Application Notes

Application Note 3489: Installing the DS9123O USB Adapter on Windows® 98 - DS1821 Application Note 3930: Package Thermal Resistance Values (Theta JA, Theta JC) for Dallas Semiconductor Temperature Sensors - DS1821 Application Note 4600: Simple Software Validates the Hardware CRC and Detects Errors in the Serial Bit Stream of 1-Wire® Thermal Devices - DS1821

Design Guides

Thermal Management (PDF)

Reliability Reports

Reliability Report: DS1821.pdf

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-6 of 6

DS1821	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1821-C02		N/A	No Longer Available	DS1821+	Land Pattern: Not Available	-55°C to +125°C	See data sheet
DS1821			Active		PR35;3 pin;15.9 mm² Outline Drawing: 21-0247 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: D3-1*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS1821+			Active		PR35;3 pin;15.9 mm² Outline Drawing: 21-0247 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: D3+1*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1821S			Active		SOIC (W);8 pin;44.1 mm² Land Pattern: Not Available Use pkgcode/variation: W8-3*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS1821S+			Active		SOIC (W);8 pin;44.1 mm² Outline Drawing: 21-0262 (PDF) Land Pattern: 90-0258 (PDF) Use pkgcode/variation: W8+4*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1821S+T&R			Active		SOIC (W);8 pin;44.1 mm² Outline Drawing: 21-0262 (PDF) Land Pattern: 90-0258 (PDF) Use pkgcode/variation: W8+4*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

Temperature Family by Product Type

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Technical Documents

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More Information

Description   Key Features   Applications/Uses   Key Specifications   Diagram

Data Sheet   Application Notes   Design Guides   Engineering Journals   Reliability Reports   Software/Models   Evaluation Kits

Price and Availability   Samples   Buy Online   Package Information   Lead-Free Information

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