Using the Integrated Temperature Sensor
To use the on-chip temperature sensor, select the analog input channel INCHx = 1010. Any other
configuration is done as if an external channel was selected, including reference selection,
conversion-memory selection, etc.
The typical temperature sensor transfer function is shown in Figure 22-13. When using the temperature
sensor, the sample period must be greater than 30 µs. The temperature sensor offset error is large.
Deriving absolute temperature values in the application requires calibration. See the device-specific data
sheet for the parameters.
Selecting the temperature sensor automatically turns on the on-chip reference generator as a voltage
source for the temperature sensor. However, it does not enable the VREF+ output or affect the reference
selections for the conversion. The reference choices for converting the temperature sensor are the same
as with any other channel. |
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