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Calibrating at 25°C will improve accuracy to ±4.5°C.
Calibration at three points -40°C, 25°C, and 105°C will improve accuracy to ±2.5°C.
After calibration has been completed, you will need to calculate the slope for both hot
and cold. In application code, you can calculate the temperature as detailed above and
determine if it is above or below 25°C. After you have determined whether the
temperature is above or below 25 °C. you can recalculate the temperature using the hot or
cold slope value obtained during calibration.
17.2 Introduction
The 12-bit analog-to-digital converter (ADC) is a successive approximation ADC
designed for operation within an integrated microcontroller system-on-chip.
17.2.1 Features
Features of the ADC module include:
• Linear Successive Approximation algorithm with 8-, 10-, or 12-bit resolution
• Up to 8 external analog inputs, external pin inputs, and 5 internal analog inputs
including internal bandgap, temperature sensor, and references
• Output formatted in 8-, 10-, or 12-bit right-justified unsigned format
• Single or Continuous Conversion (automatic return to idle after single conversion)
• Support up to eight result FIFO with selectable FIFO depth
• Configurable sample time and conversion speed/power
• Conversion complete flag and interrupt
• Input clock selectable from up to four sources
• Operation in Wait or Stop modes for lower noise operation
• Asynchronous clock source for lower noise operation
• Selectable asynchronous hardware conversion trigger
• Automatic compare with interrupt for less-than, or greater-than or equal-to,
programmable value
NXP Semiconductors
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
Chapter 17 Analog-to-digital converter (ADC)
259
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