STMicroelectronics recently introduced the new STTS75, a high-precision digital CMOS temperature sensor IC with a sigma-delta temperature-to-digital converter and an I²C-compatible serial digital interface. It is targeted for general applications such as electronics equipment, system thermal management and industrial controllers. With excellent power saving features and a small package, it is well suited to handheld devices.
The device contains a band-gap temperature sensor and programmable 9- to 12-bit ADC which monitors and digitises the temperature to a resolution up to 0,0625°C. The part is accurate to +3°C over the full temperature measurement range of -55°C to 125°C, with +2°C accuracy in the -25°C to +100°C range.
The on-board sigma-delta analog-to-digital converter (ADC) converts the measured temperature to a digital value that is calibrated in °C; for Fahrenheit applications a lookup table or conversion routine is required.
The STTS75 is factory-calibrated and requires no external components to measure temperature. The power-up defaults permit stand-alone operation as a thermostat. A dual purpose event pin operates as an interrupt or comparator/thermostat output. The power saving one-shot mode can be used when the part is in shutdown to perform a single temperature conversion.
The IC has a simple 2-wire I²C-compatible digital serial interface which allows the user to access the data in the temperature register at any time. It communicates via the serial interface with a master controller which operates at speeds up to 400 kHz. Three pins are available for address selection, and enable the user to connect up to eight devices on the same bus without address conflict. In addition, the serial interface gives the user easy access to all registers to customise operation of the device.
The STTS75 is specified to operate at supply voltages from 2,7 V to 5,5 V; operating at 3,3 V, the supply current is typically 75 μA. It is available in SO-8 and MSOP8 (TSSOP8) packages.
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