LM3S2918 Luminary Micro, Inc, LM3S2918 Datasheet - Page 271

• Manufacturer Part Number: LM3S2918
• Description: Lm3s2918 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

12.2.6
12.2.7
July 26, 2008
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 298).
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 271.
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
LM3S2918 Microcontroller
271