The XC3101 series from Torex is a CMOS bandgap-type temperature sensor IC which is available with analogue VAOUT and alarm VDOUT outputs, and which consumes 3.5µA. The sensor IC is suitable for battery-powered devices or low-profile, power-conscious applications. The voltage output by the VAOUT pin is the result of a ±3.5°C temperature detection that can operate between -40 and +100°C, followed by a ±0.4% temperature-to-voltage conversion whose co-efficient is -11.77mV/°C. For applications that require not only the accurate tracking of the temperature via the analogue output, but also a clear indication as to when the monitored temperature rises above a pre-defined value, the VDOUT pin of the IC will provide the appropriate logic signal, says the company. The ±4.5°C threshold of this open drain alarm output is 70°C. The detect output lowers when the temperature monitored by the IC goes above this pre-set threshold. The output returns to high when the temperature drops below a pre-set hysteresis, whose width is selectable between 0, 2.4 and 5°C. The IC operates with an input voltage range of 2.7 to 5.5V. The USPN-4 package with dimensions of 1.2x0.9x0.4mm is suitable for space-limited applications.
