LM3S5D91 Datasheet, PDF (618/1340 Pages) Texas Instruments – Stellaris® LM3S5D91 Microcontroller

Analog-to-Digital Converter (ADC)
Figure 12-13. Differential Sampling Range, V_{IN_ODD} = 2.25 V
12-bit
0xFFF
10-bit
0x3FF
0xBFF 0x2FF
0x7FF 0x1FF
0.75 V
-1.5 V
2.25 V
3.0 V
0.75 V
- Input Saturation
1.5 V
V_{IN_EVEN}
DV
12.3.6
Internal Temperature Sensor
The temperature sensor's primary purpose is to notify the system that the internal temperature is
too high or low for reliable operation.
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.
The internal temperature sensor provides an analog temperature reading as well as a reference
voltage. This reference voltage, SENSO, is given by the following equation:
SENSO = 2.7 - ((T + 55) / 75)
This relation is shown in Figure 12-14 on page 619.
618
January 22, 2012
Texas Instruments-Production Data