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Unique 1-Wire® Interface Requires Only One Port Pin for Communication

  • Smart acquisition of Temperature and Humidity
  • Supports RS485 Protocol
  • IP67 Compliant
  • High Accuracy
  • No External Components Required
  • Parasitic Power Mode Requires Only 2 Pins for Operation (DQ and GND)
  • Simplifies Distributed Temperature-Sensing Applications with Multi drop Capability
  • Each Device Has a Unique 64-Bit Serial Code Stored in On-Board ROM
  • Flexible User-Definable Nonvolatile (NV) Alarm Settings with Alarm Search Command Identifies Devices with Temperatures Outside Programmed Limits
  • Available in 8-Pin SO (150 mils), 8-Pin µSOP, and 3-Pin TO-92 Packages

1-Wire Temperature Sensor

The Temperature Sensor connects to the Dallas input of the tracking unit and enables temperature-monitoring in Fleet Management applications. The Sensor is installed in the area that requires temperature monitoring, and sends Temperature information to the tracking unit's 1-Wire(Dallas) input as a function of the temperature level. The tracking unit sends the received value to the control server on every location update message. The server-side software translates the information to a visual indication of temperature level, alerting the user of breached thresholds and any other application layer activities.

  • Features
  • Technical Specifications

Unique 1-Wire® Interface Requires Only One Port Pin for Communication

  • Reduce Component Count with Integrated Temperature Sensor and EEPROM
  • Measures Temperatures from -55°C to +125°C (-67°F to +257°F)
  • ±0.5°C Accuracy from -10°C to +85°C • Programmable Resolution from 9 Bits to 12 Bits
  • Reduce Component Count with Integrated Temperature Sensor and EEPROM
  • No External Components Required
  • Parasitic Power Mode Requires Only 2 Pins for Operation (DQ and GND)
  • Simplifies Distributed Temperature-Sensing Applications with Multi drop Capability
  • Each Device Has a Unique 64-Bit Serial Code Stored in On-Board ROM
  • Flexible User-Definable Nonvolatile (NV) Alarm Settings with Alarm Search Command Identifies Devices with Temperatures Outside Programmed Limits
  • Available in 8-Pin SO (150 mils), 8-Pin µSOP, and 3-Pin TO-92 Packages
Parameter Symbol Condition Min Type Max Units
Supply Voltage VDD Local power (Note 1) +3.0   +5.5 V
Pullup Supply Voltage Vpu Parasite power (Notes 1,2) +3.0   +5.5 V
Local power +3.0   VDD
Thermometer tERR -10˚C to +85˚C (Notes 3)     ±0.5 ˚C
-55˚C to +125˚C     ±2
Input Logic-Law VIL (Notes 1, 4, 5) -0.3   +0.8 V
Input Logic-High VIH Local Power (Notes 1,6) +2.2 The Lower
of 5.5 or VDD+ 0.3
V
Parasite Power +3.0
Sink Current IL VI/O=0.4V 4.0     mA
Standby Current IDDS (Notes 7,8)   750 1000 nA
Active Current IDD VDD=5V (Note 9)   1 1.5 mA
DQ Input Current IDQ (Note 10)   5   pA
Drift   (Note 11)   ±0.2   ˚C
  • The connecting wires are protected by a flexible corrugated metal-plastic tube
  • High accuracy
  • IP57 compliant