LM3S828 Datasheet, PDF (330/526 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark

Analog-to-Digital Converter (ADC)
Figure 10-4. Differential Sampling Range, V_{IN_ODD} = 2.25 V
ADC Conversion Result
0x3FF
0x2FF
0x1FF
0.75 V
-1.5 V
2.25 V
3.0 V
0.75 V
- Input Saturation
1.5 V
VIN_EVEN
DV
10.3.6
10.3.7
Test Modes
There is a user-available test mode that allows for loopback operation within the digital portion of
the ADC module. This can be useful for debugging software without having to provide actual analog
stimulus. This mode is available through the ADC Test Mode Loopback (ADCTMLB) register (see
page 359).
Internal Temperature Sensor
The temperature sensor does not have a separate enable, since 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. The voltage at the output terminal SENSO is given by the following equation:
SENSO = 2.7 - ((T + 55) / 75)
This relation is shown in Figure 10-5 on page 331.
330
June 18, 2012
Texas Instruments-Production Data