LM3S8971 Luminary Micro, Inc, LM3S8971 Datasheet - Page 274
LM3S8971
Manufacturer Part Number
LM3S8971
Description
Lm3s8971 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S8971.pdf
(602 pages)
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Analog-to-Digital Converter (ADC)
12.2.6
12.2.7
274
Figure 12-4. Differential Sampling Range, V
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 301).
Internal Temperature Sensor
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 12-5 on page 274.
Figure 12-5. Internal Temperature Sensor Characteristic
0.75 V
-1.5 V
ADC Conversion Result
0x3FF
0x2FF
0x1FF
- Input Saturation
2.25 V
Preliminary
0.75 V
3.0 V
IN_ODD
= 2.25 V
1.5 V
V
V
IN_EVEN
July 26, 2008
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