MC9S08JM16CGTE FREESCALE [Freescale Semiconductor, Inc], MC9S08JM16CGTE Datasheet - Page 135

• Manufacturer Part Number: MC9S08JM16CGTE
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

For temperature calculations, use the V
Characteristics.”
In application code, the user reads the temperature sensor channel, calculates V
V
less than V
To improve accuracy, calibrate the bandgap voltage reference and temperature sensor. Calibrating at 25°C
will improve accuracy to ±4.5°C. Calibrating at 3 points, –40°C, 25°C, and 125°C will improve accuracy
to ±2.5°C. Once calibration has been completed, the user needs to calculate the slope for both hot and cold.
In application code, the user would then calculate the temperature using
and then determine if the temperature is above or below 25°C. Once determined, the user can recalculate
the temperature using the hot or cold slope value obtained during calibration.
10.1.2
The ADC is capable of running in stop3 mode but requires LVDSE and LVDE in SPMSC1 to be set.
Freescale Semiconductor
TEMP25
— V
— m is the hot or cold voltage versus temperature slope in V/°C.
. If V
TEMP25,
Low-Power Mode Operation
TEMP25
TEMP
the hot slope value is applied in
is greater than V
is the voltage of the temperature sensor channel at 25°C.
MC9S08JM16 Series Data Sheet, Rev. 2
TEMP25,
TEMP25
the cold slope value is applied in
and m values from the
Equation
10-1.
Chapter 10 Analog-to-Digital Converter (S08ADC12V1)
Appendix A.9, “ADC
Equation 10-1
Equation
TEMP
, and compares to
10-1. If V
as detailed above
TEMP
135
is