LM3S1138 Luminary Micro, Inc, LM3S1138 Datasheet - Page 270
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LM3S1138
Manufacturer Part Number
LM3S1138
Description
Lm3s1138 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S1138.pdf
(491 pages)
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Analog-to-Digital Converter (ADC)
12.2.6
12.2.7
270
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 297).
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 270.
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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