C8051F901-GD View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

MFG CO.

C8051F901-GD

Single/Dual Battery, 0.9–3.6 V, 16–8 kB, SmaRTClock, 12/10-Bit ADC MCU

Silicon Laboratories 

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C8051F91x-C8051F90x

5.8. Temperature Sensor

An on-chip temperature sensor is included on the C8051F91x-C8051F90x which can be directly accessed

via the ADC multiplexer in single-ended configuration. To use the ADC to measure the temperature sensor,

the ADC mux channel should select the temperature sensor. The temperature sensor transfer function is

shown in Figure 5.8. The output voltage (VTEMP) is the positive ADC input when the ADC multiplexer is set

correctly. The TEMPE bit in register REF0CN enables/disables the temperature sensor, as described in

SFR Definition 5.15. 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 4.11 for the

slope and offset parameters of the temperature sensor.

VTEMP = Slope x (TempC - 25) +Offset

TempC = 25 + (VTEMP - Offset) / Slope

Slope ( V / deg C)

Offset ( V at 25 Celsius)

Temperature

Figure 5.8. Temperature Sensor Transfer Function

80

Rev. 1.0

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