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DS1821
Product Overview
The DS1821 belongs to the category of digital temperature sensors and thermostats. It is commonly used for temperature monitoring and control in various electronic devices and systems. The DS1821 is known for its high accuracy, digital output, and versatile packaging options. It is available in a variety of packages and quantities to suit different application requirements.
Basic Information
- Category: Digital Temperature Sensor and Thermostat
- Use: Temperature monitoring and control
- Characteristics: High accuracy, digital output
- Package: Various options available
- Essence: Precise temperature sensing and control
- Packaging/Quantity: Available in different packaging options and quantities
Specifications
- Temperature Range: -55°C to +125°C
- Accuracy: ±2°C (max) from -10°C to +85°C
- Resolution: 9 to 12 bits
- Supply Voltage: 3V to 5.5V
- Interface: 2-wire serial interface
Detailed Pin Configuration
The DS1821 features a standard pin configuration with pins for power supply, ground, data input/output, and alarm output.
| Pin Name | Description | |----------------|--------------------------| | VDD | Power Supply | | GND | Ground | | DQ | Data Input/Output | | TOUT | Alarm Output |
Functional Features
- Digital temperature sensing
- Programmable temperature setpoints
- Nonvolatile memory for storing user-defined settings
- Alarm output for temperature threshold detection
Advantages and Disadvantages
Advantages
- High accuracy
- Wide temperature range
- Flexible packaging options
- Nonvolatile memory for settings retention
Disadvantages
- Limited resolution compared to some alternative models
- Higher cost compared to basic analog temperature sensors
Working Principles
The DS1821 utilizes a digital temperature sensor to measure the ambient temperature. It compares the measured temperature with the user-programmed setpoints and triggers an alarm output if the temperature exceeds the specified thresholds. The nonvolatile memory ensures that the device retains the programmed settings even during power loss.
Detailed Application Field Plans
The DS1821 finds applications in various fields such as: - HVAC systems - Industrial automation - Consumer electronics - Medical devices - Automotive industry
Detailed and Complete Alternative Models
Some alternative models to DS1821 include: - LM35: Analog temperature sensor with higher resolution - TMP36: Low-cost analog temperature sensor - DS18B20: Digital temperature sensor with higher resolution and additional features
In conclusion, the DS1821 is a versatile digital temperature sensor and thermostat suitable for a wide range of applications. Its high accuracy, digital output, and programmable setpoints make it a preferred choice for temperature monitoring and control in diverse industries.
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What is the DS1821?
- The DS1821 is a digital thermometer and thermostat with nonvolatile memory.
How does the DS1821 work?
- The DS1821 measures temperature using an on-chip temperature sensor and can be programmed to perform various thermostat functions based on the measured temperature.
What is the operating temperature range of the DS1821?
- The DS1821 has an operating temperature range of -55°C to +125°C.
Can the DS1821 be used in battery-powered applications?
- Yes, the DS1821 has low power consumption and can be used in battery-powered applications.
What is the resolution of the temperature measurements from the DS1821?
- The DS1821 provides 9-bit temperature readings, which corresponds to a temperature resolution of 0.5°C.
Can the DS1821 be interfaced with a microcontroller?
- Yes, the DS1821 can be easily interfaced with a microcontroller using its simple 2-wire serial interface.
Is the DS1821 suitable for industrial applications?
- Yes, the DS1821 is designed to meet the requirements of industrial applications and can operate reliably in harsh environments.
Can the DS1821 store temperature history data?
- Yes, the DS1821 has nonvolatile memory that can be used to store temperature history data.
What are the typical applications of the DS1821?
- The DS1821 is commonly used in applications such as environmental monitoring, temperature control systems, and industrial automation.
Does the DS1821 have built-in temperature hysteresis settings?
- Yes, the DS1821 allows users to set temperature hysteresis to prevent rapid switching of control outputs near the setpoint temperature.