Temperature sensor combines low power with high accuracy

Posted By : Nat Bowers
Temperature sensor combines low power with high accuracy

 

Combining low power consumption and high accuracy in a 1.6x1mm package, the AS6200 digital temperature sensor has been announced by ams. The device's typically consumes just 6µA at a measurement rate of 4S/s and its digital measurement outputs are accurate to ±0.4°C.

The factory calibrated AS6200 integrates in a single chip the functions required in a temperature sensing system, making it easy for users to design the sensor into their space-constrained or battery-powered products.

The device consists of a silicon bandgap sensor, an ADC, a digital signal processor and a serial I2C interface. The on-chip DSP handles all linearisation and calibration, producing a 12-bit (0.0625°C resolution) binary output.

Despite its high level of integration, the AS6200 draws very little current. Operating from a supply range of 1.8-3.6V, the AS6200 draws just 1.5µA at a measurement rate of 1S/s. The conversion rate can be set in a range from 0.25 to 8Hz. At lower conversion frequencies, power consumption is lower. In stand-by mode, in which all the chip’s functions are turned off except the serial interface, it draws just 0.1µA (typical).

The AS6200 creates new opportunities for manufacturers of battery-powered, mobile and wearable devices to implement digital temperature sensing into new designs without paying a power or space penalty. Industrial process control solutions and IoT applications such as cold-chain monitoring are significantly enhanced as space and power savings are realised when using the AS6200.

“Backed by ams’ proprietary low-power, high-sensitivity analogue process, this results in the factory calibrated AS6200’s industry-best combination of accuracy (±0.4°C, max between 0 and +65°C), low power consumption and small size (1.6mm2)”, said Christian Feierl, Marketing Manager, ams.

The sensor’s I2C interface allows for two devices to be connected to one bus. The sensor also has a pin dedicated to an Alert function, which triggers an interrupt at the host MCU when the measured temperature crosses a high or low temperature threshold set by the user.

The AS6200 is available immediately in production volumes, priced at €0.49 each in 1,000 unit quantities. An evaluation board is also available online from the ams ICdirect online store.

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