This slide highlights some of the features of the STLM20 analog temperature sensor. The transfer characteristic offers good linearity over a wide temperature and voltage range with lower current consumption than competitive parts. Typical current consumption is less than 5µA, making it ideal for portable devices where battery life becomes critical. The STLM20 precision analog output temperature sensor operates over a -55°C to +130°C (grade 7) or -40°C to 85°C (grade 9) temperature range. At an ambient temperature of 25°C, the accuracy of the sensor is ±1.5°C. The  temperature error increases linearly to a maximum of ±2.5°C at temperature range extremes. The STLM20 operates from a supply voltage of 2.4V to 5V and has a maximum quiescent supply current of 8μA, therefore self-heating is negligible. The temperature range is affected by the power supply voltage. As an example, for a grade 7 device with a power supply voltage of 2.7V to 5.5V, the temperature range extremes are -55°C and +130°C. By decreasing the power supply voltage to 2.4V, the negative extreme would change to -30°C, while the positive remains at +130°C. The STLM20’s transfer function can be described in different ways, with varying levels of precision. A simple linear transfer function, with good accuracy near 25°C is expressed as:

VO = (-11.79mV) / °C x T + 1.8528V.