C8051F310 datasheet(53/228 Pages) SILABS

53 / 228 page

Rev. 1.7

C8051F310/1/2/3/4/5/6/7

The uncalibrated temperature sensor output is extremely linear and suitable for relative temperature mea-

surements (see Table 5.1 for linearity specifications). For absolute temperature measurements, gain and/

or offset calibration is recommended. Typically a 1-point calibration includes the following steps:

Step 1. Control/measure the ambient temperature (this temperature must be known).

Step 2. Power the device, and delay for a few seconds to allow for self-heating.

Step 3. Perform an ADC conversion with the temperature sensor selected as the positive input

and GND selected as the negative input.

Step 4. Calculate the offset and/or gain characteristics, and store these values in non-volatile

memory for use with subsequent temperature sensor measurements.

Figure 5.3 shows the typical temperature sensor error assuming a 1-point calibration at 25 °C. Note that

parameters which affect ADC measurement, in particular the voltage reference value, will also

affect temperature measurement.

Figure 5.3. Temperature Sensor Error with 1-Point Calibration

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Temperature (degrees C)

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C8051F310 Datasheet(PDF) 53 Page - Silicon Laboratories

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