TM4C1233H6PZIR Datasheet, PDF (795/1233 Pages) Texas Instruments – Tiva TM4C1233H6PZ Microcontroller

Tiva^™ TM4C1233H6PZ Microcontroller _{(identical to LM4F122H5QC)}
Figure 13-10 shows how the differential voltage, ∆V, is represented in ADC codes.
Figure 13-10. Differential Voltage Representation
0xFFF
0x800
-(VREFP - VREFN)
0
V
- Input Saturation
VREFP - VREFN
13.3.6
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 13-11 on page 796.
July 17, 2013
795
Texas Instruments-Production Data