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DS1821
Programmable Digital Thermostat and Thermometer
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Status
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.
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Data Sheet
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Key Features
- 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
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Applications/Uses
- Consumer Products
- Industrial Systems
- Thermometers
- Thermostatic Controls
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Key Specifications:
| Temperature Sensors |
| Part Number |
Sensor Type |
Functions |
Interface |
Accuracy
(±°C) |
Parasite Pwr. |
Temp. Thresh. |
Temp. Resolution
(bits) |
Oper. Temp.
(°C) |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| max w/pins |
See Notes |
| DS1821 |
Local |
| Standalone Thermostat | | Temperature Switch/Temperature Comparator |
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1 |
No |
Programmable (NV) |
8 |
-55 to +125 |
44.1 |
$2.31 @1k |
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See All Temperature Sensors (103)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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| Temperature Switches |
| Part Number |
Switch Type |
Functions |
Interface |
Accuracy
(±°C) |
Temp. Thresh.
(°C) |
Features |
Package/Pins |
Budgetary Price |
| See Notes |
| DS1821 |
Local |
| Standalone Thermostat | | Temperature Switch/Temperature Comparator |
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1 |
| Factory Programmed | | Programmable |
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| Open Drain Active Low Output | | Single-Wire Interface |
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$2.31 @1k |
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See All Temperature Switches (22)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Block Diagram
Application Notes
Product Guides
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Recommended Replacement |
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| DS1821
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Active |
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TO92-E;3 pin;15.9 mm²
Outline Drawing:21-0247 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: D3-1*
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-55°C to +125°C
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RoHS/Lead-Free: No
Materials Analysis |
| DS1821+
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Active |
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TO92-E;3 pin;15.9 mm²
Outline Drawing:21-0247 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: D3+1*
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-55°C to +125°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS1821-C02
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N/A |
No Longer Available |
DS1821+
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PR35;
Land Pattern: Not Available
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-55°C to +125°C
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See data sheet
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| DS1821S
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Active |
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SOIC;8 pin;44.1 mm²
Outline Drawing:21-0262 (PDF)
Land Pattern: 90-0258 (PDF)
Use pkgcode/variation: W8-2*
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-55°C to +125°C
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RoHS/Lead-Free: No
Materials Analysis |
| DS1821S+
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Active |
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SOIC;8 pin;44.1 mm²
Outline Drawing:21-0262 (PDF)
Land Pattern: 90-0258 (PDF)
Use pkgcode/variation: W8+4*
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-55°C to +125°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS1821S+T&R
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Active |
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SOIC;8 pin;44.1 mm²
Outline Drawing:21-0262 (PDF)
Land Pattern: 90-0258 (PDF)
Use pkgcode/variation: W8+4*
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-55°C to +125°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.
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Information Index
Rev 3;
2007-07-11
This page last modified: 2011-02-14
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