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The circuit presented in this paper responds to both of the main requirements of a smart temperature sensor: high performance (that is a very good linearity with respect to temperature variations) and a small price per chip (realized by reducing the die area and the interconnection costs). The core of the proposed smart temperature sensor is represented by an exponential curvature-corrected CMOS bandgap reference, with a temperature coefficient of 7.5 ppm/K for an extended temperature range. The entire circuit was implemented in 0.35 μm CMOS technology, the analog core occupying a die area of about 70 μm × 110 μm. In order to reduce the interconnection costs and their delays and static errors, an I2C interface was on-chip integrated.