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STMicroelectronics Intros Digital Temperature Sensors

January 29, 2008

Low-cost, drop-in replacements for LM75, DS75 and TCN75A temperature sensor chips feature shutdown mode, plus low operating and standby currents.


GENEVA, /PRNewswire-FirstCall/ -- STMicroelectronics (NYSE:STM) , a leader in analog ICs, announced a new series of precision digital- output temperature sensors, operating over the –55°C to 125°C temperature range, which are ideal for low power applications in a broad range of product areas. The cost-competitive STxx75 devices are software-compatible drop-in replacements for industry-standard LM75, DS75 and TCN75A parts, and also complement ST's STLM20 analog temperature sensor, now being used in several mobile phone designs.

The digital sensors, in standard 8-lead TSSOP and SO-8 packages, are intended for use in any control application where a processor with an I2C bus/SMBus needs to take action based on an accurate digital reading of the local temperature, or where an alarm or interrupt is required when a preset temperature level is reached. They use a band-gap temperature sensor, with a programmable 9-bit to 12-bit sigma-delta ADC (analog to digital converter) to digitize the temperature reading to a resolution of up to 0.0625°C. The STTS75 devices are factory-calibrated and require no external components.

Accuracy is ±3°C over the full –55°C to 125°C temperature range, and ±2°C from –25°C to 100°C. The sensors are designed for a supply voltage range of 2.7 V to 5.5 V and have a low operating current of 75 µA (typical) at 3.3 V. In the power-saving shutdown mode the standby current is a very low 1 µA maximum. Power-up defaults enable standalone operation as a thermostat, and both temperature and hysteresis values are programmable.

Typical applications include any product with a hard drive—including laptops, servers and some set-top boxes—plus medical equipment, industrial controllers and LCD backlighting. Brighter displays and higher speed circuits mean more heat is being generated, which must be dissipated in ever-smaller packages. This challenge for thermal management in consumer and industrial electronics means that the temperature of ICs and ambient air must be carefully monitored to prevent over-heating and damage.

The STTS75 series is available in volume in SO-8 and MSOP8 (TSSOP8) packages, priced at $0.70 in quantities of 1,000. Samples are also readily available.

About STMicroelectronics
STMicroelectronics is a global leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivalled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today's convergence markets. The Company's shares are traded on the New York Stock Exchange, on Euronext Paris and on the Milan Stock Exchange. In 2007, the Company's net revenues were $10 billion.


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