Proving the Business Case for the Internet of Things

Digital sensor keeps errors low in cold-storage equipment

Steve Rogerson
January 3, 2018
A digital temperature sensor from Austria Microsystems can help designers of cold-storage equipment meet error budget targets. The AS6200C sensor provides easy-to-use digital output and requires no user calibration or linearisation.
The digital temperature sensor IC provides measurements in the temperature range -20 to +10˚C. It is for designers of refrigerators and data loggers in cold-chain storage equipment to meet targets for system-level accuracy.
The device’s measurements are accurate to ±0.2˚C between -20 and +10˚C, the temperature range over which storage equipment for perishable goods operate. The sensor’s accuracy is guaranteed over the device’s supply voltage range of 1.8 to 3.6V.
In temperature control and temperature logging applications, the total error budget is made up of multiple components. By reducing the error at the point of measurement, the designer gains extra headroom for other error and noise sources, such as the heat generated by board-mounted components.
The use of the device is said to give the designer more flexibility to modify other elements of the system design while keeping total error below a specified maximum level.
It integrates a sensor front end, 12bit analogue-to-digital converter and digital logic in a WL-CSP package. A digital output is provided over an I2C interface to any host microcontroller. The device performs on-board digital signal processing, which means it needs no user calibration, and its linearised output requires no compensation by an external microcontroller.
The device is for use in equipment for storing and transporting food, pharmaceuticals, flowers and other perishable goods, as well as in domestic and commercial refrigerators. It is suited to data loggers that comply with the EN12830: 1999 class one standard.
“The AS6200C offers the market a unique combination of small size – its footprint is only 1.5mm2 – very high accuracy over the cold-chain monitoring and storage temperature range, and a convenient digital output requiring no calibration or linearisation,” said Nikolai Haslebner, marketing manager at AMS. “It provides a new example of the value of the low-noise, high-sensitivity, high-linearity semiconductor technology underlying the outstanding performance of AMS’s sensor products.”
The AS6200C is available in production volumes. An evaluation board is available.