Datasheet

mV per ADC code = (2 *(VREFP - VREFN)) / 4096
Figure 18-10 shows how the differential voltage, ∆V, is represented in ADC codes.
Figure 18-10. Differential Voltage Representation
0 VREFP - VREFN
V
0xFFF
0x800
- Input Saturation
-(VREFP - VREFN)
18.3.6 Internal Temperature Sensor
The temperature sensor serves two primary purposes: 1) to notify the system that internal temperature
is too high or low for reliable operation and 2) to provide temperature measurements for calibration
of the Hibernate module RTC trim value.
The temperature sensor does not have a separate enable, because it also contains the bandgap
reference and must always be enabled. The reference is supplied to other analog modules; not just
the ADC. In addition, the temperature sensor has a second power-down input in the 3.3 V domain
which provides control by the Hibernation module.
The internal temperature sensor converts a temperature measurement into a voltage. This voltage
value, V
TSENS
, is given by the following equation (where TEMP is the temperature in °C):
V
TSENS
= 2.7 - ((TEMP + 55) / 75)
This relation is shown in Figure 18-11 on page 1216.
1215December 13, 2013
Texas Instruments-Advance Information
Tiva
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TM4C129XNCZAD Microcontroller