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 |