LM3S1C21 Datasheet, PDF (615/956 Pages) Texas Instruments – Stellaris® LM3S1C21 Microcontroller

Stellaris^® LM3S1C21 Microcontroller
Figure 13-10. 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
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 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 13-11 on page 616.
January 22, 2012
615
Texas Instruments-Production Data