MC9S08SH8CSCR View Datasheet(PDF) - Freescale Semiconductor
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MFG CO.
'MC9S08SH8CSCR' PDF : 341 Pages View PDF
Chapter 9 Analog-to-Digital Converter (S08ADCV1)
In application code, the user reads the temperature sensor channel, calculates VTEMP, and compares it to
VTEMP25. If VTEMP is greater than VTEMP25 the cold slope value is applied in Equation 9-1. If VTEMP is
less than VTEMP25 the hot slope value is applied in Equation 9-1.
Calibrating at 25°C will improve accuracy to ± 4.5°C.
Calibration at three points, -40°C, 25°C, and 125°C will improve accuracy to ± 2.5°C. Once calibration
has been completed, the user will need to calculate the slope for both hot and cold. In application code, the
user would then calculate the temperature using Equation 9-1 as detailed above and then determine if the
temperature is above or below 25°C. Once determined if the temperature is above or below 25°C, the user
can recalculate the temperature using the hot or cold slope value obtained during calibration.
Figure 9-1 shows the MC9S08SH8 with the ADC module highlighted.
MC9S08SH8 MCU Series Data Sheet, Rev. 3
Freescale Semiconductor
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