High Accuracy Temperature Measurements With The ams OSRAM AS6223
Silicon bandgap technology enabled miniaturization and increased efficiency across a variety of fields. ams Osram applies the process to temperature sensors, yielding high accuracy and low power consumption in a minimal form factor.
From a technical standpoint, the component combines the sensing element and all necessary conversion circuitry into a single monolithic sensor. Host microcontrollers use the I2C interface to collect temperature information from the host microcontroller, which is provided in an easy-to-process format.
High Accuracy of Up to +/- 0.09 °C
When operating in a range of 20 °C to 42 °C, the AS6223 achieves an incredible accuracy of only plus/minus 0.09 degrees centigrade. In practice, the chip is often even more accurate, as shown in the figure below.
Designers working on calibration-sensitive applications will, furthermore, be delighted to discover that these needs are met by the system at hand:
The AS6223 production test setup is calibrated according to NIST, and the verification equipment is calibrated by an ISO/IEC-17025 accredited laboratory. The AS6223 fulfills NIST traceability.
Power consumption is kept low by the efficient internal circuitry. At a sampling rate of 4 samples per second, the current consumption is 7.5 μA. If the sensor is not needed, it can be put into sleep mode. In this state, the standby current drops to 0.25 μA.
Multiple Voltage and Address Variants
Cutting-edge semiconductor design enables the AS6223 to operate with supply voltages as low as 1.2V, which is ideally suited to the needs of FPGAs and similar demanding applications. Designers can, however, also opt for 1.8V versions. This leads to the complete line-up shown in the figure below.
One interesting aspect is the address selection, which is done at purchase time. For example, SKU AS6223A is an all-1.8V unit with a device address of 0x54. AS6223E is all-1.2V, and has a bus address of 0x55. Finally, units such as the AS6223K are mixed-voltage.
Across all 12 SKUs, 4 addresses are supported, allowing up to 4 thermosensors to be connected to a single I2C host. All of the above-mentioned units achieve their tiny 0.82 mm x 0.82 mm size by shipping in a WLCSP semiconductor housing. Developers seeking to get started without SMD soldering can do so with the Demo Kit, available via SKU "AS6223 Demo Kit".
Conclusion
Designers seeking to put advanced technology to work on temperature management need to look no further than the ams Osram AS6223. Its high accuracy, low power consumption, and tiny housing ensure ultimate satisfaction.