Temperature Sensors / Detectors / Transducers
Remote Junction Temperature Sensors offer accuracy to ±1°C.
Press Release Summary:
Supplied in 8-lead SOT23 package, single remote channel TMP421 and dual remote channel TMP422 feature built-in local temperature sensor with ±1.5°C max accuracy. Both RoHS-compliant products include series resistance cancellation, programmable non-ideality factor, and diode fault detection. They operate on I2C/SMBus-compatible, 2-wire interface and feature multiple addresses. Operating over -40 to +125°C range (remote to 150°C), products consume less than 3 µA (typ).
Original Press Release:
TI Introduces ±1°C Remote and Local Temperature Sensors with n-Factor and Series Resistance Correction
Industry's Only Remote Junction Temperature Sensor in a SOT23
DALLAS (October 3, 2007) - Texas Instruments Incorporated (TI) (NYSE: TXN) today introduced 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 boast remote sensor accuracy of ±1°C (maximum) and a local temperature sensor range of ±1.5°C (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 a great fit for industrial controllers, processor/FPGA temperature monitoring and storage area networks. (See www.ti.com/tmp421-pr.)
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 -40°C to 125°C, with a remote temperature range of up to 150°C. 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.
Available Today
The TMP421 and TMP422 are available now from TI and its authorized distributors in an 8-lead SOT23 package. The TMP421 is priced at $1.25 each in 1,000-piece quantities and the TMP422 is priced at $1.65 each in 1,000-piece quantities (suggested resale pricing).
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. For more information on TI´s complete analog design support, and to download the latest Amplifier and Data Converter Selection Guide, visit www.ti.com/analogelab.
Texas Instruments Incorporated provides innovative DSP and analog technologies to meet our customers' real world signal processing requirements. In addition to Semiconductor, the company includes the Education Technology business. TI is headquartered in Dallas, Texas, and has manufacturing, design or sales operations in more than 25 countries.
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