High-accuracy digital temp sensor for wearables, data centers
The AS6221 digital temperature sensor is offered as a complete temperature system that achieves a measurement accuracy of ±0.09°C over a temperature range from 20°C to 42°C, outperforming competitive digital temperature sensor chips. The sensor, says the company, enables more accurate body/skin temperature measurement performance in health and lifestyle monitoring products.
“In high-end consumer products such as smart watches and lifestyle monitoring wristbands, skin temperature is a critical metric, and so design engineers devote an enormous amount of time and effort to achieving and then validating high temperature measurement accuracy across all operating conditions,” says Alexander Rensink, Business Segment Manager Position Sensors at ams. “The introduction of the AS6221 makes that task easier, providing more accurate measurement outputs, easing the integration of temperature sensing into the system, and giving flexibility to support a range of operating voltages.”
The AS6221 is housed in a WLCSP package with a footprint of 1.5 mm x 1 mm, and draws 6 µA at an output data rate of 4 Hz; stand-by current is just 0.1 µA. In addition to battery-powered portable and wearable devices, such as premium lifestyle or fitness monitoring wristbands and smart watches, says the company, the compact and low-power sensor is well suited to enabling precise regulation of the operation of the processors in high-end computing systems and servers to maximize system throughput while avoiding overheating.
The high accuracy of the AS6221 is specified across the device’s entire supply voltage range of 1.7 V to 3.6 V. By contrast, says the company, the most accurate competing sensors can only achieve their highest accuracy at a single voltage point, producing less accurate outputs across the rest of their operating voltage range.
The sensor features a short measurement conversion time of 35 ms. Its full operating temperature range is -40°C to 125°C. A complete digital temperature sensor system, the AS6221 requires no calibration or linearization. It provides its measurement outputs via a standard I2C interface, and includes eight I2C addresses.
The AS6221 also offers an alarm function, to alert the user when a temperature threshold is crossed. The temperature value for the alarm function may be set by a host processor via the device’s register instruction set.
The AS6221 temperature sensor is currently available for sampling.
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