Many customers reported that their ADC function works on FRDM-KL27Z board but meet issue on their own board. We need to pay attention to the difference between the ADC reference voltages of different packages (on board MKL27Z64VLH4 is 64LQFP package).
This tip introduce the ADC Reference Options on KL17/KL27 32/36pin package
Part number involved:
32-pins | 36-pins |
---|---|
MKL17Z32VFM4 | MKL17Z32VDA4 |
MKL17Z64VFM4 | MKL17Z64VDA4 |
MKL27Z32VFM4 | MKL27Z32VDA4 |
MKL27Z64VFM4 | MKL27Z64VDA4 |
PTE30/VREF_OUT- connected as the primary reference option on 36-pin and below packages
VDDA/VSSA - connected as the VALT reference option
ADCx_SC2[REFSEL] selects the voltage reference source used for conversions.
About the primary reference option:
KL17P64M48SF2RM Kinetis KL17: 48MHz Cortex-M0+ 32-64KB Flash (32-64pin) (REV 4.1)
KL27P64M48SF2RM Kinetis KL27: 48MHz Cortex-M0+ 32-64KB Flash (32-64pin) (REV 4.1)