DS1626:High-Precision 3-Wire Digital Thermometer and Thermostat

High-Precision, 3-Wire Digital Thermometers/Thermostats Provide Temperature Measurements and Stand-Alone Thermostat Capability over a -55°C to +125°C Range

The DS1626 and DS1726 digital thermometers/thermostats provide temperature measurements and stand-alone thermostat capability over a -55°C to +125°C range. The DS1626 offers ±0.5°C accuracy from 0°C to +70°C and the DS1726 has ±1°C accuracy from -10°C to +85°C. The resolution of the measured temperature is user selectable from 9 to 12 bits. Communication with the DS1626 and DS1726 is achieved through a 3-wire serial bus. The DS1626 and DS1726 offer thermostatic functionality with three dedicated thermostat outputs (THIGH, TLOW, and TCOM), and overtemperature (TH) and undertemperature (TL) user-programmable thresholds stored in on-chip EEPROM. For stand-alone thermostat operation, TH and TL can be programmed prior to installation, and the DS1626/DS1726 can be configured to automatically begin taking temperature measurements at power-up. Table 1, in the full data sheet, summarizes the user-accessible registers. Figure 1, in the full data sheet, shows a functional diagram.

Key Features
  • Temperature Measurements Require No External Components
  • Measure Temperatures from -55°C to +125°C (-67°F to +257°F)
  • DS1626: ±0.5°C Accuracy from 0°C to +70°C
  • DS1726: ±1°C Accuracy from -10°C to +85°C
  • Output Resolution is User Selectable to 9, 10, 11, or 12 Bits
  • Wide Power-Supply Range (2.7V to 5.5V)
  • Convert Temperature to Digital Word in 750ms (max)
  • Stand-Alone Thermostat Capability
  • Thermostatic Settings are User Definable and Nonvolatile (NV)
  • Data is Read/Written Through a 3-Wire Serial Interface
  • Available in 8-Pin µSOP Package
DS1626, DS1726: Functional Diagram
DS1626, DS1726: Functional Diagram
Applications/Uses
  • Any Space-Constrained Thermally Sensitive Application
  • Consumer Products
  • Industrial Controls
  • Thermostatic Controls
DataSheet
titleDownload file
DS1626-DS1726 Data SheetDS1626-DS1726.pdf
Parametrics
Part NumberSensor TypeFunctionsInterfaceChannelsAccuracy
(±°C)
Parasite Pwr.Temp. Thresh.Temp. Resolution
(bits)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
See Notes
DS1626LocalDual Temperature Alarms
Standalone Thermostat
3-Wire
Logic
One0.5NoProgrammable (NV)9
10
11
12
-55 to +125µMAX/8
SOIC/8
$1.82 @1k
DS17261µMAX/8$1.79 @1k

Part NumberFunctionsInterfaceAccuracy
(±°C)
Temp. Thresh.
(°C)
Package/PinsBudgetary
Price
See Notes
DS1626Dual Temperature Alarms
Standalone Thermostat
3-Wire
Logic
0.5ProgrammableµMAX/8
SOIC/8
$1.82 @1k
DS17261µMAX/8$1.79 @1k
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
DS1626SNo Longer AvailableDS1626S+SOIC,;8 pin;44.1 mm²-55°C to +125°CNo
DS1626S+ActiveSOIC,;8 pin;44.1 mm²-55°C to +125°CLead Free
DS1626S+T&RActiveSOIC,;8 pin;44.1 mm²-55°C to +125°CLead Free
DS1626UNo Longer AvailableDS1626U+µMAX,;8 pin;15.6 mm²-55°C to +125°CNo
DS1626U+ActiveµMAX,;8 pin;15.6 mm²-55°C to +125°CLead Free
DS1626U+T&RActiveµMAX,;8 pin;15.6 mm²-55°C to +125°CLead Free
DS1626U/T&RNo Longer AvailableDS1626U+T&RµMAX,;8 pin;15.6 mm²-55°C to +125°CNo
DS1626-DS1726.pdf DS1726
Introduction to Medical Instruments and Growing Trend for Point-of-Care and Near-Patient Testing MAX31820PAR
Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices MAX31826
DS1626.pdf DS1626
DS1626-DS1726.pdf DS1726