
• Wait for calibration to finish. This will be indicated by conversion complete flag
(COCO in ADC_SC1A).
• Run ADC conversions with high accuracy in your application. Make sure to re-
configure ADCK clock speed and to re-configure AVGE and AVGS to the desired
settings.
For more detailed information about calibration guidelines, refer to the application note
AN5314:
ADC Calibration on Kinetis E+ Microcontrollers
NOTE
In the OFS, CLPX and CLP9 registers, the calibration
values are signed numbers (in 2's complement format).
37.6.4 Application hints
The ADC has been designed to be integrated into a microcontroller for use in embedded
control applications requiring an ADC. For guidance on selecting optimum external
component values and converter parameters, refer to the application note AN5250:
to Increase the Analog-to-Digital Converter Accuracy in an Application
.
37.6.5 DMA Support on ADC
Applications may require continuous sampling of the ADC (4K samples/sec) that may
have considerable load on the CPU. Though using PDB to trigger ADC may reduce some
CPU load, the ADC supports DMA request functionality for higher performance when
the ADC is sampled at a very high rate or cases where PDB is bypassed. The ADC can
trigger the DMA (via DMA req) on conversion completion.
For most cases, the DMA request can be directly triggered from ADC conversion
completion. The device also support another way to trigger DMA via TRGMUX module.
The TRGMUX will provide user a more flexible DMA triggering scheme using software
based on different application requirements, for example, the DMA can be triggered after
multiple ADC conversion completion instead of every ADC conversion completion.
37.6.6 ADC low-power modes
The ADC will be available in STOP, VLPR, VLPW, and VLPS mode.
NOTE
When in VLPx mode, the ADC clock source is only limited to
OSC and SIRC.
Usage Guide
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
862
NXP Semiconductors
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