Temperature Sensor (C8051T620/6/7 And C8051T320/1 Only); Figure 9.1. Temperature Sensor Transfer Function - Silicon Laboratories C8051T620 Manual

9. Temperature Sensor (C8051T620/6/7 and C8051T320/1 Only)

An on-chip temperature sensor is included on the C8051T620/6/7 and C8051T320/1 which can be directly
accessed via the ADC multiplexer in single-ended configuration. To use the ADC to measure the tempera-
ture sensor, the ADC mux channel should be configured to connect to the temperature sensor. The tem-
perature sensor transfer function is shown in Figure 9.1. The output voltage (V
input when the ADC multiplexer is set correctly. The TEMPE bit in register REF0CN enables/disables the
temperature sensor, as described in SFR Definition 10.1. 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 7.11 for the slope and offset parameters of the temperature sensor.

Figure 9.1. Temperature Sensor Transfer Function

C8051T620/1/6/7 & C8051T320/1/2/3
V = (Slope x Temp
TEMP
Temp = (V - Offset) /
C TEMP
Temperature
Rev. 1.2
TEMP
) + Offset
C
Slope
Slope (V / deg C)
Offset (V at 0 Celsius)
) is the positive ADC
57