Overview
The DS18B20-PAR is a digital thermometer produced by Analog Devices Inc./Maxim Integrated. This device is designed to provide precise temperature measurements with a unique set of features that make it highly versatile. It operates over a 1-Wire bus, requiring only one data line and ground for communication with a central microprocessor. The DS18B20-PAR derives its power directly from the data line, eliminating the need for an external power supply, a feature known as 'parasite power.' This thermometer offers user-selectable resolution from 9 to 12 bits and includes an alarm function with nonvolatile user-programmable upper and lower trigger points.
Key Specifications
| Parameter | Specification |
|---|---|
| Temperature Measurement Range | -55°C to +125°C |
| Temperature Accuracy | ±0.5°C over -10°C to +85°C range |
| Resolution | User-selectable from 9 to 12 bits |
| Conversion Time | 94ms (9-bit), 188ms (10-bit), 375ms (11-bit), 750ms (12-bit) |
| Voltage Range | 3V to 5.5V |
| Interface | 1-Wire bus |
| Power Mode | Parasitic power mode |
| Packages | TO-92 and 8-pin SOIC |
| Compliance | RoHS3 compliant |
Key Features
- Unique 1-Wire interface requiring only one digital pin for communication
- Derives power from the data line ('parasite power'), eliminating the need for an external power supply
- Multi-drop capability, allowing multiple devices to function on the same 1-Wire bus
- User-selectable resolution from 9 to 12 bits
- Alarm function with nonvolatile user-programmable upper and lower trigger points
- No external components required
- Each device has a unique 64-bit identification code
- Ideal for remote sensing applications without a local power source
Applications
- Industrial and commercial temperature monitoring and control
- HVAC systems
- Appliances
- Automotive and transportation
- Building automation
- Consumer electronics
- Remote sensing applications (e.g., temperature probes)
- Process monitoring and control systems
Q & A
- What is the temperature measurement range of the DS18B20-PAR?
The DS18B20-PAR measures temperatures from -55°C to +125°C.
- How does the DS18B20-PAR derive its power?
The DS18B20-PAR derives its power directly from the data line, a feature known as 'parasite power'.
- What is the resolution of the DS18B20-PAR?
The resolution is user-selectable from 9 to 12 bits.
- What is the conversion time for the DS18B20-PAR?
The conversion time varies from 94ms (9-bit) to 750ms (12-bit).
- Does the DS18B20-PAR require any external components?
No, the DS18B20-PAR does not require any external components.
- How does the alarm function work on the DS18B20-PAR?
The alarm function has nonvolatile user-programmable upper and lower trigger points. An alarm condition is identified when the temperature is outside these programmed limits.
- What packages is the DS18B20-PAR available in?
The DS18B20-PAR is available in TO-92 and 8-pin SOIC packages.
- Is the DS18B20-PAR RoHS compliant?
Yes, the DS18B20-PAR is RoHS3 compliant.
- Can multiple DS18B20-PAR devices be used on the same 1-Wire bus?
Yes, multiple devices can function on the same 1-Wire bus due to their unique 64-bit identification codes.
- What are some common applications of the DS18B20-PAR?
Common applications include HVAC systems, industrial and commercial temperature monitoring, automotive, building automation, and consumer electronics.
