C8051F521-C-IM 데이터 시트보기 (PDF) - Silicon Laboratories

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C8051F521-C-IM

8/4/2 kB ISP Flash MCU Family

Silicon Laboratories 

C8051F52x/F53x

4.2. Temperature Sensor

An on-chip temperature sensor is included on the C8051F52x/F52xA/F53x/F53xA devices which can be

directly accessed via the ADC0 multiplexer. To use ADC0 to measure the temperature sensor, the ADC

multiplexer channel should be configured to connect to the temperature sensor. The temperature sensor

transfer function is shown in Figure 5.2. The output voltage (VTEMP) is the positive ADC input selected by

bits AD0MX[4:0] in register ADC0MX. The TEMPE bit in register REF0CN enables/disables the tempera-

ture sensor, as described in SFR Definition 5.1. While disabled, the temperature sensor defaults to a high

impedance state and any ADC measurements performed on the sensor will result in meaningless data.

Refer to Table 5.1 for the slope and offset parameters of the temperature sensor.

VTEMP = ( Slope x TempC) + Offset

TempC = (VTEMP - Offset) / Slope

Slope( V / deg C)

Offset( V at 0 Celsius)

Temperature

Figure 4.2. Typical Temperature Sensor Transfer Function

Rev. 1.4

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