High-precision temperature sensor offer best-in-class power efficiency

13-01-2015 | Silicon Laboratories Inc | Test & Measurement

A new family of high-precision temperature sensors offering industry-leading power efficiency has been introduced by Silicon Labs. The ultra low-power Si705x temperature sensors consume only 195nA (typical average current) when sampled once per second, which minimizes self-heating and enables multi-year coin cell battery operation.

Unlike traditional digital temperature sensors, the Si705x devices maintain their accuracy across the full operating temperature and voltage ranges and offer four accuracy levels up to +/-0.3C. The sensors are ideal for HVAC, white goods, computer equipment, asset tracking, cold chain storage, industrial control and medical equipment. AEC-Q100-qualified versions are also available for automotive applications.

Traditional approaches to temperature sensing that use thermistors or embedded MCU temperature sensors suffer from poor accuracy and higher power consumption. Although improved accuracy can be achieved through end-of-line calibration, this technique presents additional manufacturing costs and challenges while accuracy is still susceptible to variations in power supply voltage. In contrast, the Si705x sensors’ patented signal processing technology provides stable temperature accuracy over the entire operating voltage and temperature ranges without the need for costly end-of-line production calibration. In addition, the integrated low-power analog design delivers an optimal price/performance solution with up to 35 times better power efficiency than competing temperature sensor products, says the company.

Available in a compact 3mm x 3mm DFN package, the Si705x sensors feature an industry-standard I2C interface for easy configuration. Each device provides up to 14-bit temperature resolution for high-precision measurement, and the -40C to +125C temperature range is suitable for consumer, industrial and automotive applications. With a low 1.9V minimum power supply voltage, the Si705x sensors can be connected directly to a battery without the need for an external voltage regulator.

“Temperature is the most pervasive environmental metric that embedded developers need to measure, and today’s designers expect exceptional power efficiency, accuracy and price/performance from their temperature sensing solutions,” said Ross Sabolcik, vice president and general manager of Silicon Labs’ Analog, Power and Sensor products. “Although many competing options are available for temperature sensing, the Si705x devices provide the most power-efficient option while maintaining accuracy across the entire operating voltage and temperature range so developers don’t need to compromise on performance.”

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