DS1821S+T&R

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Temperature sensors are widely used in a variety of applications such as industrial, HVAC, and automotive systems. Temperature sensors come in a variety of types with analog and digital outputs. The DS1821S+T&R is a temperature sensor with a thermistor output and an externally adjustable set-point alarm output.

The DS1821+T&R is a dual-channel sensor that combines an integrated thermistor for accurate temperature measurement and an external temperature set-point adjustable alarm. The thermistor is a precision negative temperature coefficient (NTC) device of 0.22 ohms, with excellent temperature response and accuracy specifications. The externally adjustable alarm set-point provides alarm flexibility, improving system reliability and flexibility. The DS1821+T&R also includes a 3-wire interface for power and alarm outputs, allowing for easy connection to an application processor or control system.

The DS1821+T&R operates from a single 3V power supply of either 2.7V-3.3V, and comes in a small, low-profile package. It is available in a variety of packages including standard 8-pin PDIP, SOIC and TSSOP. The combination of low power, small size and thermal accuracy makes it ideal for a wide variety of applications.

The DS1821+T&R’s thermistor output is a direct-reading voltage produced by the thermistor divider network. This voltage is proportional to the temperature and is suitable for direct connection to an analog-to-digital converter (ADC) input. The thermistor output is temperature compensated for variations in power supply voltage and can be used to provide temperature reading to an application processor or microcontroller.

The externally adjustable set-point alarm output is used to indicate an alarm condition. The output is open-drain and can be driven low to indicate an alarm condition. The alarm set-point is adjusted by applying a voltage between the ALM_SET pin and the RT/ALM_COM pin. The output switch can be used to turn off an external device or with a pull-up resistor, turn it on when the alarm is satisfied.

The DS1821+T&R also features a power-on reset and an open-drain on/off control. The power-on reset function provides a reliable reset circuit that is independent of the power supply and can be used to reset a processor. The on/off control allows the system to be powered down for savings of power in low-power applications. The DS1821+T&R is an excellent choice for temperature sensing and alarm detection in a wide variety of applications.

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