Reset
Initialize ADC
CFG1=0x98
SC2=0x00
SC1n=0x41
Check
1?
Read Rn
To clear
SC1n[COCO]
Continue
Yes
No
SC1n[COCO]=
36.6.3 Calibration
The ADC contains a self-calibration function that is required to achieve the specified
accuracy. Calibration must be run, or valid calibration values written, after any reset and
before a conversion is initiated. Not doing this can result in ADC conversion results with
lower than specified accuracy.
In order to calibrate ADC correctly the following steps have to be done:
• On startup, wait until reference voltage (VREFH/VREFL) has stabilized, use 3
bypass capacitance in the range: 1 μF, 100 nF and 1 nF.
• Calibrate only one ADC instance at a time, no parallel calibration of ADCs because
they will disturb each other.
• Set ADCK (ADC clock) to half the maximum specified frequency, e.g. 25 MHz.
• Start ADC calibration by writing ADC_SC3 register with: CAL=1, AVGE=1,
AVGS=11.
Chapter 36 Analog-to-Digital Converter (ADC)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
775
Содержание Kinetis KE1xZ256
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