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AN2680 Datasheet(PDF) 3 Page - STMicroelectronics |
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AN2680 Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 15 page AN2680 Digital temperature sensor 3/15 1 Digital temperature sensor The STDS75 and STLM75 are digital temperature sensors that measure the ambient temperature and give the digital output. Both the STDS75 and STLM75 are 8-pin ICs available in two packages, SO-8 and TSSOP-8. The measurable temperature range of the sensors is -55 °C to 125 °C. The STLM75 and STDS75 differ only in terms of the resolution of the temperature data. The STLM75 has a fixed 9-bit resolution whereas the STDS75 has configurable resolution starting from 9 to 12 bits. In the present application, we move with the default resolution settings of the sensor that is 9 bits and thus both the STDS75 and STLM75 are dealt with in the same manner. Figure 1. Temperature sensor pin description 1.1 Theory of operation This temperature sensor is a high-precision CMOS IC with a delta-sigma analog-to-digital converter (ADC) and I2C compatible serial digital interface. The on board delta-sigma ADC converts the measured temperature to a digital value that is calibrated in degree Celsius. Negative temperature is shown in two's compliment form. The sensor also has an alarm output signal. Table 1. Pin description Name Description SDA Serial data input output pin SCL Serial clock input pin Alarm Alarm output pin GND DC ground A0,A1,A2 Address lines VCC Supply voltage (2.7 V- 5.5 V) |
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