C8051F302-GM 查看數據表（PDF） - Silicon Laboratories

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C8051F302-GM

Mixed Signal ISP Flash MCU Family

Silicon Laboratories 

C8051F300/1/2/3/4/5

(mV)

1200

1100

1000

900

VTEMP = 3.35*(TEMPC) + 897 mV

800

700

-50

0

50

100 (Celsius)

Figure 5.2. Typical Temperature Sensor Transfer Function

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.

Rev. 2.9

37

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