Figure 12-13. Differential Sampling Range, V
IN_ODD
= 2.25 V
0xFFF
0xBFF
0x7FF
0.75 V 2.25 V 3.0 V V
IN_EVEN
DV
-1.5 V 0.75 V 1.5 V
- Input Saturation
12-bit
0x3FF
0x2FF
0x1FF
10-bit
12.3.6 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 12-14 on page 548.
547July 24, 2012
Texas Instruments-Production Data
Stellaris
®
LM3S6G65 Microcontroller
OBSOLETE: TI has discontinued production of this device.
