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samples: drivers: adc: adc_sequence: Fix nrf54h20dk configuration

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AIN9 source needs special handling (all from AIN8-AIN14). Conversion
result needs to be scaled up by 3.6 additionally to gain and reference
voltage. In order to achieve correct value in the sample vref-mv is
used as reference voltage instead of predefined internal reference
source.

Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>
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Krzysztof Chruściński 2025-03-20 13:52:43 +01:00 • committed by Benjamin Cabé
commit 7a162846c4
1 changed files with 1 additions and 0 deletions
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samples/drivers/adc/adc_sequence/boards/nrf54h20dk_nrf54h20_cpuapp.overlay
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@ -45,6 +45,7 @@
zephyr,reference = "ADC_REF_INTERNAL";
zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
zephyr,input-positive = <NRF_SAADC_AIN9>; /* P9.01 */
zephyr,vref-mv = <3686>; /* 3.6V * 1024 */
zephyr,resolution = <12>;
zephyr,oversampling = <8>;
};