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±1C Remote and Local Temperature Sensors from TI have n-Factor and Series Resistance Correction

4th October 2007

Texas Instruments

ES Admin

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Texas Instruments today introduced what it says is the industry’s smallest remote junction temperature sensors with a built-in local temperature sensor. The single remote channel TMP421 and dual remote channel TMP422 provide remote sensor accuracy of ±1C (maximum) and a local temperature sensor range of ±1.5C (maximum). Both sensors are RoHS compliant and can be used in numerous applications including LCD/DLP/LCOS projectors, servers, central office telecom equipment and laptop computers. They are also suitable for industrial controllers, processor/FPGA temperature monitoring and storage area networks.

The TMP421 and TMP422 feature a two-wire/SMBus serial interface as well as multiple addresses. The remote temperature sensor diode-connected transistors are typically low-cost NPN- or PNP-type transistors or diodes that are an integral part of microprocessors, microcontrollers and FPGAs. The TMP421 and TMP422 also include series resistance cancellation, programmable non-ideality factor and diode fault detection.

The sensors operate on a standard I2C/SMBus compatible, two-wire interface over a temperature range of -40C to 125C, with a remote temperature range of up to 150C. For maximum power savings, the device circuitry (other than the serial interface) can be shut down, thereby reducing current consumption to typically less than 3uA.

TI offers analog engineers a wide-ranging support infrastructure that includes training and seminars, design tools and utilities, technical documentation, evaluation modules, an online KnowledgeBase, a product information hotline and a comprehensive offering of samples that ship within 24 hours of request.