DS1621: High-Precision Digital Temperature Sensor with I²C Interface

 

The DS1621 is a digital temperature sensor with a built-in I²C interface, making it ideal for precise temperature measurement in a variety of applications. With an operating range of -55°C to +125°C and an accuracy of ±0.5°C, it’s a popular choice for climate control systems, industrial automation, and embedded applications. 

In this article, we’ll explore the key features, specifications, applications, and advantages of the DS1621, highlighting why it’s an excellent option for temperature monitoring and control. 

 

Key Features of DS1621 

 

1. Wide Temperature Measurement Range 

   - Measures temperatures from -55°C to +125°C, suitable for various environments. 

2. High Accuracy 

   - Provides ±0.5°C accuracy in the range of 0°C to 70°C for precise monitoring. 

3. Digital Output via I²C Interface 

   - Communicates via I²C (2-wire serial bus), allowing easy integration with microcontrollers. 

4. Built-in Thermostat Function 

   - Includes user-programmable high and low-temperature alarms, ideal for automated temperature control. 

5. Non-Volatile EEPROM Storage 

   - Stores temperature setpoints in non-volatile memory, even when power is lost. 

6. Low Power Consumption 

   - Operates with minimal power, making it suitable for battery-powered applications. 

7. Standalone Temperature Control Mode 

   - Can function without a microcontroller, using its built-in thermostat feature. 

8. 8-Pin DIP and SOIC Package Options 

   - Available in compact DIP-8 and SOIC-8 packages for easy integration into PCB designs. 

 

DS1621 Specifications 

 

Parameter                             Value              

Temperature Range            -55°C to +125°C       

Accuracy                                ±0.5°C (0°C to 70°C)  

Interface                               I²C (2-wire)          

 Operating Voltage              2.7V to 5.5V          

Resolution                             9-bit digital output  

 Current Consumption        ~1mA active, 1µA standby  

 Package Types                    DIP-8, SOIC-8         

 Non-Volatile Memory       Yes (EEPROM for setpoints)  

 

Pinout of DS1621 

 

Pin       Name             Function   

1          A0                   I²C Address Selection   

2          A1                   I²C Address Selection   

3          A2                   I²C Address Selection   

4          GND                Ground   

5          SDA                 I²C Data Line   

6          SCL                  I²C Clock Line   

7          TOUT              Thermostat Output   

8          VCC                 Power Supply (2.7V–5.5V)   

 

Applications of DS1621 

 

1. Industrial and Home Automation 

   - Used in HVAC systems, smart thermostats, and climate monitoring. 

2. Data Logging and Weather Stations 

   - Monitors temperature changes in scientific and agricultural applications. 

3. Refrigeration and Cold Chain Monitoring 

   - Ensures proper temperature levels in freezers, refrigerators, and food storage. 

4. Medical Equipment 

   - Used in incubators, vaccine storage, and hospital equipment for precise temperature control. 

5. Embedded Systems and IoT Devices 

   - Works with Arduino, Raspberry Pi, ESP32, and other microcontrollers for smart temperature monitoring. 

6. Computer and Server Cooling Systems 

   - Helps regulate CPU, GPU, and server temperatures to prevent overheating. 

7. Battery Temperature Monitoring 

   - Ensures safe charging and discharging of lithium-ion batteries. 

Advantages of DS1621  

✔ I²C Communication → Simple two-wire interface for easy integration. 

✔ High Accuracy → ±0.5°C precision for reliable temperature monitoring. 

✔ Low Power Consumption → Ideal for battery-powered applications. 

✔ Non-Volatile Memory → Saves temperature setpoints even after power loss. 

✔ Built-in Thermostat → Can operate independently without a microcontroller. 

✔ Compact Package → Available in DIP-8 and SOIC-8 formats for various PCB designs.  

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