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Merge branch 'bugfix/adc_two_point_cal_val_update' into 'master'

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Updated information in  documentation about  'Two Point Values' used to calibrate ADC readings

See merge request idf/esp-idf!2678
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Angus Gratton
2018-07-11 12:53:33 +08:00
parent 9d830a6f7c 8a7ee46b7f
commit 064261cd3a
2 changed files with 3 additions and 5 deletions
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docs/en/api-reference/peripherals/adc.rst
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@@ -114,7 +114,7 @@ Calibration Values
Calibration values are used to generate characteristic curves that account for the unique ADC reference voltage of a particular ESP32. There are currently three sources of calibration values. The availability of these calibration values will depend on the type and production date of the ESP32 chip/module.
**Two Point** values represent each of the ADCs’ readings at 150mV and 850mV. These values are measured and burned into eFuse ``BLOCK3`` during factory calibration.
**Two Point** values represent each of the ADCs’ readings at 150mV and 850mV. To obtain more accurate calibration results these values should be measured by user and burned into eFuse ``BLOCK3``.
**eFuse Vref** represents the true ADC reference voltage. This value is measured and burned into eFuse ``BLOCK0`` during factory calibration.